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  Subjects -> ELECTRONICS (Total: 179 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 7)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 5)
Advances in Electronics     Open Access   (Followers: 78)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Microelectronic Engineering     Open Access   (Followers: 13)
Advances in Power Electronics     Open Access   (Followers: 33)
Advancing Microelectronics     Hybrid Journal  
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 313)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 24)
Annals of Telecommunications     Hybrid Journal   (Followers: 9)
APSIPA Transactions on Signal and Information Processing     Open Access   (Followers: 9)
Archives of Electrical Engineering     Open Access   (Followers: 13)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Bioelectronics in Medicine     Hybrid Journal  
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 36)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 1)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 47)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Electronics     Hybrid Journal  
Circuits and Systems     Open Access   (Followers: 15)
Consumer Electronics Times     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 266)
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 105)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 86)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 92)
Electronics Letters     Hybrid Journal   (Followers: 26)
Elkha : Jurnal Teknik Elektro     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 51)
Energy Harvesting and Systems     Hybrid Journal   (Followers: 4)
Energy Storage Materials     Full-text available via subscription   (Followers: 3)
EPJ Quantum Technology     Open Access  
EURASIP Journal on Embedded Systems     Open Access   (Followers: 11)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 10)
Frequenz     Hybrid Journal   (Followers: 1)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 1)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 189)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 4)
IACR Transactions on Symmetric Cryptology     Open Access  
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 97)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 77)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 46)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 9)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 66)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 70)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 56)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 19)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 40)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 19)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 26)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 71)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 5)
IET Cyber-Physical Systems : Theory & Applications     Open Access   (Followers: 1)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 35)
IET Nanodielectrics     Open Access  
IET Power Electronics     Hybrid Journal   (Followers: 46)
IET Smart Grid     Open Access  
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 18)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 13)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 58)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 24)
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
Instabilities in Silicon Devices     Full-text available via subscription   (Followers: 1)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 13)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 18)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 10)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 5)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 6)
International Journal of Control     Hybrid Journal   (Followers: 12)
International Journal of Electronics     Hybrid Journal   (Followers: 7)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 13)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 2)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 14)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 8)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 12)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 4)
International Journal of Power Electronics     Hybrid Journal   (Followers: 24)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 10)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 6)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
JAREE (Journal on Advanced Research in Electrical Engineering)     Open Access  
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 3)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 10)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 24)
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electrical, Electronics and Informatics     Open Access  
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 7)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 8)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 6)
Journal of Electronics (China)     Hybrid Journal   (Followers: 4)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Engineered Fibers and Fabrics     Open Access  
Journal of Field Robotics     Hybrid Journal   (Followers: 2)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 167)
Journal of Information and Telecommunication     Open Access   (Followers: 1)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 7)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 9)
Journal of Microelectronics and Electronic Packaging     Hybrid Journal  
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal  
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 10)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 4)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 28)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 11)
Journal of Semiconductors     Full-text available via subscription   (Followers: 5)
Journal of Sensors     Open Access   (Followers: 26)
Journal of Signal and Information Processing     Open Access   (Followers: 9)
Jurnal Rekayasa Elektrika     Open Access  
Jurnal Teknik Elektro     Open Access  
Jurnal Teknologi Elektro     Open Access  
Kinetik : Game Technology, Information System, Computer Network, Computing, Electronics, and Control     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 7)
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 2)
Metrology and Measurement Systems     Open Access   (Followers: 5)
Microelectronics and Solid State Electronics     Open Access   (Followers: 18)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 33)
Nanotechnology, Science and Applications     Open Access   (Followers: 6)
Nature Electronics     Hybrid Journal  
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Electrical & Electronic Engineering Journal     Open Access  
Open Journal of Antennas and Propagation     Open Access   (Followers: 8)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 15)
Paladyn. Journal of Behavioral Robotics     Open Access   (Followers: 1)
Power Electronics and Drives     Open Access   (Followers: 1)
Problemy Peredachi Informatsii     Full-text available via subscription  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Pulse     Full-text available via subscription   (Followers: 5)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Advances in Communications and Networking Technology     Hybrid Journal   (Followers: 3)
Recent Advances in Electrical & Electronic Engineering     Hybrid Journal   (Followers: 9)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 5)
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 53)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 75)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 13)
Solid-State Electronics     Hybrid Journal   (Followers: 9)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 3)
Technical Report Electronics and Computer Engineering     Open Access  
TELE     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 9)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 6)
Visión Electrónica : algo más que un estado sólido     Open Access   (Followers: 1)
Wireless and Mobile Technologies     Open Access   (Followers: 6)
Wireless Power Transfer     Full-text available via subscription   (Followers: 4)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
Електротехніка і Електромеханіка     Open Access  

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Similar Journals
Journal Cover
IEEE Journal of Emerging and Selected Topics in Power Electronics
Journal Prestige (SJR): 1.657
Citation Impact (citeScore): 7
Number of Followers: 46  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2168-6777 - ISSN (Online) 2168-6785
Published by IEEE Homepage  [191 journals]
  • IEEE Journal of Emerging and Selected Topics in Power Electronics
    • Abstract: Provides a listing of current staff, committee members and society officers.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • IEEE Power Electronics Society Information
    • Abstract: Provides a listing of current committee members and society officers.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Editorial IEEE Journal of Emerging and Selected Topics in Power
    • Authors: Don F. D. Tan;Olorunfemi Ojo;
      Pages: 2 - 3
      Abstract: As we enter the new year of 2019, at the time of this writing, we are glad to report that our journal, IEEE Journal of Emerging and Selected Topics in Power Electronics (IEEE JESTPE) now stands among the top 3% of all journals in electrical and electronic engineering. The metrics that IEEE reported for the year of 2017 are: Impact factor of 5.117, Eigen Factor of 0.00996, and Article Influence Score of 1.892. For JESTPE to achieve such great influence in its short five-year history, from its inception in 2013 to 2017, is quite an accomplishment. As the founding Editor-in-Chief, I am extremely thankful for the good fortune that I have had to work with the large number of talented volunteers on our regular editorial board and guest editorial board.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Guest Editorial: Special Section on Transient Behaviors of Multi-Timescale
           Megawatt Power Electronics Systems
    • Authors: Zhengming Zhao;Don F. D. Tan;
      Pages: 4 - 6
      Abstract: With the rapid development of a new generation of power systems and high power traction, megawatt power electronics receives increasingly more global attention for enhanced capability and reliability. Megawatt power electronics apparatuses and systems are composed of control units, high-power semiconductor devices, passive elements, and generalized connecting parts, in which effective transformation and transmission of electric power are achieved via the control of information flow over energy flow. When considering multiple time-scales, the megawatt power electronics systems turn into a combination of linearity and nonlinearity, and also the one of discrete and continuous quantities, which results in complicated transient phenomena. In addition, scalability and modularity become growing trends for the megawatt power converters, which are preferred by the manufacturers.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Transient Behaviors of Multiscale Megawatt Power Electronics
           Systems—Part I: Characteristics and Analysis
    • Authors: Zhengming Zhao;Don Tan;Kai Li;
      Pages: 7 - 17
      Abstract: With the rapid development of the electric power grid and high-power tractions, megawatt power electronics technology is receiving tremendous attentions across the globe. The major obstacles to its further development still exist in enhancing its capability and reliability. Technical challenges and opportunities of megawatt power electronics are summarized first. It points out that the electromagnetic transient behaviors, especially at the short-timescales, are the main challenges. The transient behaviors of power electronics systems manifest themselves in the main-power loop, gate-drive loop, and control loop. After a detailed discussion of the transient behaviors, it is concluded that focusing on the multiscale transient behaviors can lead to significant overall performance improvement. A new perspective on the power electronics theory and techniques will lead to the development of a methodology for the analysis, design, and control of megawatt power electronics converters with significant improvements.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Transient Behaviors of Multiscale Megawatt Power Electronics
           Systems—Part II: Design Techniques and Practical Applications
    • Authors: Zhengming Zhao;Don Tan;Kai Li;Liqiang Yuan;
      Pages: 18 - 29
      Abstract: Megawatt power electronics is an enabling technology for many important industrial applications, including renewable power generation and integration, flexible electric power transmission and distribution, medium-voltage motor drives, and locomotive tractions. Major obstacles still exist for further enhancing its capability and reliability. Part I concluded that the transient behaviors are the key to megawatt power electronics systems designs for superior overall performance, low de-rating requirements and high reliability. This paper builds on the perspective of transient behaviors and presents some key techniques for the design and control of megawatt power electronics converters for high capability and reliability. The techniques include effective utilization of the state-of-art active devices and passive components with optimal power device selections, transient circuit topologies, and energy-balance-based control strategies. Practical application examples are presented to validate the proposed design techniques and to demonstrate their effectiveness.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Dynamic Phasor Model of an MMC With Extended Frequency Range for EMT
    • Authors: Janesh Rupasinghe;Shaahin Filizadeh;Liwei Wang;
      Pages: 30 - 40
      Abstract: This paper presents a new dynamic phasor (DP) model of a modular multilevel converter (MMC) with extended frequency range for direct interfacing to an electromagnetic transient (EMT) simulator. The internal dynamics of the MMC are modeled considering dominant harmonic components of each variable. To model the external dynamics of the converter, a novel construct referred to as a base-frequency DP is employed, which allows to capture and model any number of frequency components of external variables without a significant increase in computational burden. The proposed model is validated against detailed EMT models by comparing its results for an inverter system, a back-to-back high-voltage direct current system, and a 12-bus power system built in PSCAD/EMTDC simulator. Simulation results prove that the new model is significantly more computationally efficient than existing models and is capable of maintaining a high level of accuracy. Experimental verification on a scaled-down laboratory setup is also included.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • FPGA-Based Real-Time Simulation of High-Power Electronic System With
           Nonlinear IGBT Characteristics
    • Authors: Chen Liu;Rui Ma;Hao Bai;Zhongliang Li;Franck Gechter;Fei Gao;
      Pages: 41 - 51
      Abstract: The hardware-in-the-loop simulation plays a vital role in the test of high-power electronic system. Although the application of field-programmable gate array (FPGA) embedded system has enabled the real-time system simulating below 500 ns, the transient characteristic of high-voltage insulated-gate bipolar transistor (HVIGBT) is largely compromised. In this paper, a new piecewise HVIGBT model, considering its driver circuit effect and parasite parameter, is proposed for FPGA-based real-time simulation applications. With the attempt to reduce the simulation latency, we propose an FPGA solver with a parallel structural to divide the system into several layers. The model could not only provide accurate system-level performance of the power electronic converter but also give an insight into the transient behavior effect of high-power electronic system. Finally, a case study about emulation of traction system of high-speed train is also presented. Implementations are made on an FPGA Kintex-7 embedded in National Instruments FlexRIO PXIe-7975. The obtained results show that the proposed modeling algorithm can achieve both accuracy and efficiency within a fixed real-time simulation time step of 25 ns.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Lumped-Charge Model for High-Power PT-p-i-n Diode With a Buffer Layer
    • Authors: Xin Li;Yifei Luo;Yaoqiang Duan;Yongle Huang;Binli Liu;
      Pages: 52 - 61
      Abstract: This paper presents a lumped-charge model for the punchthrough p-i-n (PT-p-i-n) diode with a buffer layer. Based on the lumped-charge modeling, this paper analyzes the influence of the buffer layer and carrier lifetime control technology. The PT-p-i-n diode model involves dealing with changes in the diode doping concentration and carrier lifetime in the switching process. The variation of carrier lifetime with the injected charge is discussed and a lumped-charge model of carrier lifetime is proposed. Considering that the characteristics of p-i-n diode are changed with temperatures, the model uses the added temperature function of physical parameters to get the static and transient temperature characteristics. Then the model is implemented into the circuit simulation platform PSPICE. Finally, the antiparallel freewheeling diode in the Infineon 3300 V/1500 A Insulated Gate Bipolar Transisto module is used for verification. The comparisons between the simulated and measured results have a good agreement both in static and in switching operations at different temperatures.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Lumped-Charge Approach Based Physical SPICE-Model for High Power
           Soft-Punch Through IGBT
    • Authors: Yaoqiang Duan;Fei Xiao;Yifei Luo;Francesco Iannuzzo;
      Pages: 62 - 70
      Abstract: This paper presents a new lumped-charge approach-based physical model for high power soft-punchthrough (SPT) insulated gate bipolar transistor (IGBT). The IGBT physical models should consider the fabrication technologies used to optimize the device behavior for specific applications. The proposed model focuses on the chip structure designed by ABB for high power IGBT and can apply to other IGBTs with homogeneous structures. Based on the SPT+ concept combined with an enhanced planar cell design for the optimization of lower power losses, different particular mathematical approaches are used to describe their functions in the proposed model. The temperature dependence of the model is also included because the chip temperature of IGBT in practical applications is higher than the room temperature and changed with service conditions. The physics-based IGBT model has been implemented in PSpice and validated with experiments, which considers both the block voltage nonpunchthrough condition and punchthrough condition during turn-OFF transient. The simulation results show a good agreement with the experiment results.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Analytical Methodology for Loss Calculation of SiC MOSFETs
    • Authors: Xudong Wang;Zhengming Zhao;Kai Li;Yicheng Zhu;Kainan Chen;
      Pages: 71 - 83
      Abstract: For evaluating and optimizing the efficiency of power converters, the loss model of the power semiconductor devices is needed. The analytical loss model is favorable for its simplicity. However, the model accuracy needs to be improved. This paper proposes an analytical loss model for the commutation pair of silicon carbide (SiC) MOSFETs and SiC Schottky barrier diodes. Compared to the conventional loss calculation method, the proposed model is derived based on the conservation of energy, which considers the impact of the displacement currents on estimating the turn-on and turn-off losses. The modeling and extraction methodology of the model parameters are given, and the impact of operational conditions on the model parameters is studied. Using the proposed model, the losses can be calculated analytically and also the switching trajectories can be predicted with good consistency. A double pulse tester is built to verify the proposed model. The results show that an average modeling error is reduced from 20% using the conventional piecewise linear model, to around 10% using the proposed model under various operational conditions, and the time cost is at least 3000 times smaller compared to the existing SiC MOSFETs models.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Electrical Performance Advancement in SiC Power Module Package Design With
           Kelvin Drain Connection and Low Parasitic Inductance
    • Authors: Fei Yang;Zhiqiang Wang;Zhenxian Liang;Fei Wang;
      Pages: 84 - 98
      Abstract: Silicon carbide (SiC) power modules are promising for high-power applications because of the high breakdown voltage, high operation temperature, low ON-resistance, and fast switching speed. However, the large parasitic inductance in existing package designs results in compromised performance, i.e., long blanking time in the desaturation protection scheme and large overvoltage spikes during the switching transient. Consequently, the benefits of SiC devices are often not fully utilized in practical applications. This paper deals with these two issues and aims at improving the electrical performance of the existing SiC module package. Specifically, a package design with Kelvin drain-to-source connection is first proposed to minimize the blanking time. More than 99% reduction of blanking time is achieved experimentally compared to the conventional package design. Second, a low parasitic inductance package with double-side cooling is proposed to allow the fast switching speed of SiC devices without sacrificing the thermal performance. A power loop inductance of 1.63 nH is realized from Q3D simulation. Verified by the experiment, more than 60% reduction of power loop inductance is achieved in comparison to a previously designed baseline module. At 0- $Omega $ external gate resistance, the turn-off voltage spike is less than 9% of the dc-link voltage under the rated load condition.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Failure Mechanism of Die-Attach Solder Joints in IGBT Modules Under Pulse
           High-Current Power Cycling
    • Authors: Yongle Huang;Yifei Luo;Fei Xiao;Binli Liu;
      Pages: 99 - 107
      Abstract: Applications under extreme conditions, such as solid circuit breakers and electromagnetic launching systems, are great challenges to semiconductor power devices. The die-attach solder joint is as one of the most vulnerable structures and critical to the reliability of insulated-gate bipolar transistor (IGBT) modules. In this paper, IGBT modules were cross sectioned and tested under pulse high-current power cycling. The failure mechanism of the die-attach solder in IGBTs at pulse high-current modes was investigated. Evolution of microdefects in the die-attach solder during power cycling was characterized and factors for the failure of die-attach solder joints was discussed. The results revealed that voids, cracks, and detachment of interface were the major microdefects in the die-attach solder layer. A detachment of the Si/Sn–Ag–Cu (SAC) interface is verified as the major failure mode under pulse high-current power cycling. Interface cracks between the Si-chip and die-attach solder layer were found to initiate first at the solder layer edges and then extended to the center of the solder layer with the increase of power cycles. The detachment of Si/SAC interface was more similar to the brittle fracture. The junction temperature swing and heating rate were the key factors for detachment of the Si/SAC interface.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Transformerless Three-Port Nonagonal MMC for the Grid Connection and
           Local Consumption of Distributed Generation
    • Authors: Wenjun Liu;Fei Liu;Haiyou Gao;Yizhan Zhuang;Xiaoming Zha;
      Pages: 108 - 117
      Abstract: While large-scale distributed generation (DG) grid connection requires its grid-connected converter to be able to boost the output voltage and connect it to the host grid, its priority is still to consume the power locally so as to increase the energy utilization rate. Using a common ac bus to transmit the distributed power to local load requires two separate converters, resulting in large size and multistage power conversion. Therefore, to lose the transformer and increase the compactness, a three-port nonagonal modular multilevel converter (MMC) is proposed in this paper, which consists of nine bridge arms connected from end to end. From the vertexes, three 3-phase ac ports protrude, connecting DG, ac grid, and local load together. By reusing power modules, with only nine bridge arms, the proposed nonagonal MMC realized three-port direct ac/ac power conversion in a single converter. Furthermore, the topology can operate without a transformer or high-voltage dc link, and under low frequency. It is then compared with other topologies to demonstrate its advantage in applications that require high compactness and flexibility. Finally, the proposed topology and its corresponding control are verified in RTlab to be effective for DG grid connection and local consumption.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Multiport Circuit Breaker-Based Multiterminal DC System Fault Protection
    • Authors: Wenjun Liu;Fei Liu;Yizhan Zhuang;Xiaoming Zha;Chao Chen;Tianyi Yu;
      Pages: 118 - 128
      Abstract: Although hybrid circuit breaker (HCB) uses a combination of mechanical switch and insulated-gate bipolar transistors (IGBTs) to accommodate HVDC application, it still has a large number of series-connected IGBTs in its main breaker. Besides, in multiterminal HVDC system, three or more HCBs appear in cluster at one node, which worsens the HCBs’ disadvantage in volume. To simplify the breaker cluster’s topology structure and control system as well as increase the compactness, a multiport circuit breaker (MPCB) is proposed in this paper with its control procedure presented. By assembling the HCBs at one node, it can not only cut down the component count for fault interruption remarkably but also reduces the number of control signals. Apart from this, due to a more compact structure, the proposed circuit breaker avoided the use of a dc bus and, hence, dc bus fault which will result in disconnecting the node completely from the system. Hence, regardless of faults and their fault locations, it is always able to connect the remaining healthy ports together. Finally, the effectiveness of the proposed MPCB in different fault scenarios is verified by RTlab.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Current Stress Minimization of Dual-Active-Bridge DC–DC Converter Within
           the Whole Operating Range
    • Authors: Qing Gu;Liqiang Yuan;Jintong Nie;Jianning Sun;Zhengming Zhao;
      Pages: 129 - 142
      Abstract: Current stress minimization is one of the most important challenges for the steady-state studies of dual-active-bridge (DAB) dc–dc converter. Triple-phase-shift (TPS) control can minimize the current stress to the utmost extent, and a segmented analytical method-based TPS (SA-TPS) control has been proposed in this paper to minimize the current stress of DAB within the whole operating range. The full model of DAB with TPS control was classified into 12 operating modes by a complete operating mode classification method. On the basis of the analytical expressions of transmission power and current stress in different modes, the current stress minimization issue was transferred to inequality constraints’ problems in different operating modes. The mathematical derivation process of the SA-TPS control method is described in detail, and the analytical expressions of current stress minimization results as a function of voltage conversion ratio and transmission power have been derived by solving the forward and reverse power transmission processes, respectively. The operating mode selection principle and the regularities of minimization results varying with transmission power and voltage conversion ratio have been explored. Experiments under different conditions have been implemented on a laboratory prototype to validate the correctness and effectiveness of the proposed SA-TPS control method.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Device and System-Level Transient Analysis in a Modular Designed Sub-MW EV
           Fast Charging Station Using Hybrid GaN HEMTs + Si MOSFETs
    • Authors: Juncheng Lu;Liyan Zhu;Guanliang Liu;Hua Bai;
      Pages: 143 - 156
      Abstract: Though wide bandgap devices are believed to be promising candidates for next-generation high-efficiency and high-power-density power electronic converters, two major challenges remain, high cost (more than twice of Si) and less options (the maximum power rating for GaN is only 650 V/60 A). From the device level, paralleling GaN with Si can inherit merits of both GaN devices (superior switching performance) and Si devices (affordable with high-current capability). In this paper, first, GaN HEMTs are paralleled to a TO-247 Si MOSFET to form a high-current switching cell for a 6.6-kW electric vehicle (EV) charging module. A time delay is added between the switch gate signals to make GaN endure the switching loss and Si conduct majority of the static current. Critical dynamic behaviors, such as the current overshoot to the GaN, current distribution during the dead time, and voltage spike during the turn off caused by parasitics, are comprehensively discussed. From the system level, series connecting the input and paralleling output of multiple such modules yield a sub-MW EV charging station. Once one phase drops, the related phase can act as the active filter, while other two phases still work to charge the battery.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Capacitor Voltage Balance Control of Hybrid Modular Multilevel Converters
           With Second- Order Circulating Current Injection
    • Authors: Yufei Dong;Junsong Tang;Heya Yang;Wuhua Li;Xiangning He;
      Pages: 157 - 167
      Abstract: The capacitor voltage imbalance between the full-bridge sub-modules (FBSMs) and half-bridge sub-modules (HBSMs) may occur in the hybrid modular multilevel converters under the overmodulation operation. In this paper, the sub-module output voltage model under overmodulation is established first to explore the mechanism of capacitor voltage imbalance. With the established sub-module output voltage model, the complementary second-order voltage component in FBSMs and HBSMs is disclosed, which makes the second-order circulating current a novel control freedom to balance the capacitor voltages. With proper design of the magnitude and the phase angle of the injected second-order circulating current, the energy between the FBSMs and HBSMs is transferred and the capacitor voltage imbalance under overmodulation is eliminated. Moreover, the relationship between the sub-module capacitor voltage ripples and injected circulating current is also investigated to optimize the capacitor voltage ripple. Finally, the simulation and experiment results show that the proposed second-order circulating current injection method can not only balance the capacitor voltage but also reduce the voltage ripples of capacitors and current stress of semiconductor devices.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Model Predictive Control of High-Power Modular Multilevel
           Converters—An Overview
    • Authors: Apparao Dekka;Bin Wu;Venkata Yaramasu;Ricardo Lizana Fuentes;Navid R. Zargari;
      Pages: 168 - 183
      Abstract: Model predictive control (MPC) has emerged as a promising approach to control a modular multilevel converter (MMC). With the help of a cost function, the control objectives of an MMC are achieved easily by using an MPC approach. However, the MPC has several technical challenges and issues including the need of accurate system models, computational complexity, and variable switching frequency operation and weighting factor selection, when it comes to the control of an MMC. In the past few years, several research studies are conducted to address some of the challenges and issues in an MPC and developed several model predictive algorithms for an MMC. In this paper, the importance of each challenge and its impact on the system performance is discussed. Also, the MMC mathematical models used in the implementation of MPC are presented. Furthermore, some of the popular MPC algorithms are discussed briefly, and their features and performance are highlighted through case studies. Finally, summary and future trends of MPC for an MMC are presented.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Precompensator for Disturbance Signal Elimination in Single-Phase
           Inverters With Virtual Vector Control
    • Authors: Yuxiang Wang;Wuhua Li;Xiangning He;
      Pages: 184 - 195
      Abstract: In virtual vector control schemes for single-phase current-regulated voltage source inverters, many methods are proposed to generate a virtual orthogonal feedback current from the real feedback current. However, the generation stage causes mismatch between feedback and command currents, which may deteriorate dynamic current-tracking capability and power quality. A precise scalar model is developed to analyze the phenomenon. Based on this model, the mismatch is presented as a current disturbance signal introduced into the control loop. The mathematical analysis establishes that the current disturbance cannot be eliminated by any orthogonal signal generation (OSG) method. To solve the problem, a current precompensator is mooted. In this paper, the effect of the current precompensator is studied in detail. Furthermore, a voltage precompensator is proposed, which better suits OSG methods than the current precompensator. Experimental results of both the current and voltage precompensator are compared with the conventional solution to substantiate enhanced dynamic performance.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • $CLCL$+ +Resonant+Converter+and+Buck–Boost+Circuit&rft.title=IEEE+Journal+of+Emerging+and+Selected+Topics+in+Power+Electronics&rft.issn=2168-6777&;&rft.aufirst=Yijie&;Xihong+Hu;Yueshi+Guan;Dianguo+Xu;">A Single-Stage LED Driver Based on Half-Bridge $CLCL$ Resonant Converter
           and Buck–Boost Circuit
    • Authors: Yijie Wang;Xihong Hu;Yueshi Guan;Dianguo Xu;
      Pages: 196 - 208
      Abstract: A single-stage light-emitting diode driver based on interleaving buck–boost circuit and CLCL resonant circuit is proposed in this paper. The two circuits achieved an effective integration as well as kept their respective working conditions through the switch integration. Interleaving buck–boost circuit with symmetrical structure worked in discontinuous-conduction mode, achieving high power factor and low harmonic distortion. This structure can reduce the input current ripple and balance the current stress of switch at the same time. Besides, the bus voltage was also reduced. The CLCL resonant circuit has a soft-switching characteristic, the primary side operates in zero voltage mode and the secondary side operates in zero current mode. In addition, due to the small turn-OFF current, the turn-off loss of switch was also reduced. Therefore, the system efficiency was high. This paper elaborated the working mode, analysis and design method of the proposed topology. Finally, a 100-W experimental prototype was built, and the experimental results were corresponded with the theoretical analysis.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Optimal Configuration of High-Efficiency Segmented Linear LED Driver With
           Genetic Algorithm
    • Authors: Xiaofeng Lyu;Na Ren;Dong Cao;
      Pages: 209 - 215
      Abstract: This paper presents a genetic algorithm (GA)-based optimal configuration for multisegmented linear LED driver to achieve a maximized system efficiency. Based on the theoretical analysis of the turn-ON states, the system efficiency is derived and found to be highly dependent on the segment voltage and reference current parameters. GA with a fitness function of the system efficiency is introduced in detail for the case of a four-segmented LED voltage configuration. With an input voltage of 220 V (rms) and input current of $8times $ , $10times $ , $11times $ , and $12times $ reference for the four turn-ON states, the four optimal segment voltages are calculated to be 160, 80, 39, and 22 V. Saber simulation results show that the GA-based configuration can give a higher efficiency (96.5%) than other typical configurations (
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Extremum Seeking-Based Model Predictive MPPT for Grid-Tied Z-Source
           Inverter for Photovoltaic Systems
    • Authors: Sally Sajadian;Reza Ahmadi;Hassan Zargarzadeh;
      Pages: 216 - 227
      Abstract: This paper proposes a maximum power point tracking (MPPT) method for a grid-tied Z-source inverter (ZSI) that interfaces photovoltaic (PV) sources to the grid. The proposed MPPT method maximizes the energy harvest by guaranteed convergence to maximum power point (MPP) under dynamic weather condition from the PV panels by the ZSI as a power electronics interface. The proposed method uses the concept of model predictive control (MPC) in conjunction with extremum seeking optimization to track the true MPP and can operate without a priori knowledge of the PV panel parameters or ambient condition. At the grid side, the system injects to the grid maximum harvested energy from the PV panel obtained using the proposed MPPT algorithm. In addition, the ratio of active/reactive power injected to grid is controlled (power factor control). The optimal switching signal is determined and applied to the ZSI by minimizing the developed MPC cost function, thus eliminating the need for a modulator that simplifies the controller schematic for ZSI and can be implemented with reasonable processing effort on an inexpensive digital controller. The proposed method in this paper features: fast dynamic response to change in ambient PV panel condition, true and guaranteed convergence to MPP, negligible oscillation around MPP, and simple control structure without requirement of many cascaded control loops.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Finite-State Model Predictive Control With Integral Action Applied to a
           Single-Phase Z-Source Inverter
    • Authors: Roberto O. Ramírez;José R. Espinoza;Carlos R. Baier;Marco Rivera;Felipe Villarroel;Johan I. Guzman;Pedro E. Melín;
      Pages: 228 - 239
      Abstract: Finite control set model predictive control can be applied to a power converter if there is an accurate existing model of the converter. The best results will be achieved if and only if the parameters and variables that make up the system are properly estimated. If this is not the case, the predictions made using these strategies may be erroneous and cause problems, such as steady-state error with respect to the assigned desired references. This paper presents a predictive control strategy with integral action that compensates for the differences between the estimated model and the inverter with the objective of achieving a zero steady-state error without requiring external loops or state observers. The proposed strategy is tested on a single-phase Z-source inverter so as to evaluate the error in both the ac and dc controlled variables with respect to their references to their cosigns. The experimental results confirm that the proposed strategy achieves a zero error in the steady state while maintaining the fast dynamic response of the classic predictive control.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Three-Vector-Based Low-Complexity Model Predictive Direct Power Control
           Strategy for PWM Rectifier Without Voltage Sensors
    • Authors: Hui Li;Mingyao Lin;Ming Yin;Jian Ai;Wei Le;
      Pages: 240 - 251
      Abstract: A voltage sensorless control of low-complexity model predictive direct power control (LC-MPDPC) for pulsewidth modulation (PWM) rectifier is proposed. The conventional LC-MPDPC adopts one or two voltage vectors during one control period, which achieve good steady-state performance and quick dynamic response. In addition, based on the mathematical model of the real system, the conventional method only requires one prediction to find the optimal voltage vector, which reduces the control complexity and computational burden. However, the use of one or two vectors during one sampling interval presents abundant current harmonics and high power ripples, and the switching frequency is variable. In order to solve these problems while preserving all the advantages of the conventional LC-MPDPC, this paper presents a novel control scheme, with the aim of operating at a constant switching frequency and obtaining an excellent steady-state performance at a low switching frequency. The proposed method is based on an optimal application of three voltage vectors in a symmetrical way, which takes advantage of advanced PWM techniques. Furthermore, the virtual flux-based control scheme is introduced to achieve voltage sensorless control. The proposed strategy is compared with the conventional MPDPC methods and its effectiveness is confirmed by both simulation and experimental results from a three-phase PWM rectifier under 1000-W operation condition.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Model Predictive Direct Power Control Based on Improved T-Type
           Grid-Connected Inverter
    • Authors: Guoliang Yang;Shuai Hao;Chuntian Fu;Zhe Chen;
      Pages: 252 - 260
      Abstract: In this paper, the improved T-type three-level topology can significantly reduce the conduction loss in zero states compared with the traditional T-type three-level topology. In the direct-axis and quadrature-axis rotating coordinate system, a control method combining the model predictive algorithm and the direct power control (DPC) is proposed. This control method divides 27 kinds of switch states into two groups and decides which group of switch states is to be scrolled optimally by comparing the two capacitor voltages on the dc side. This method reduces the computational burden by reducing the number of rolling optimization under the condition of ensuring the neutral point voltage balance. Compared with the traditional multilevel model predictive control, the method eliminates the need for predicting the neutral-point voltage as well as the cost function computation, and the control method is more direct and effective. Simulation and experimental results show that the proposed model predictive DPC method based on the improved T-topology can improve system robustness, fast dynamic response, wide operating range, and stability.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Implementation of Predictive Controllers for Matrix-Converter-Based
           Interior Permanent Magnet Synchronous Motor Position Control Systems
    • Authors: Muhammad Syahril Mubarok;Tian-Hua Liu;
      Pages: 261 - 273
      Abstract: This paper proposes the implementation of predictive controllers for matrix-converter-based interior permanent magnet synchronous motor (IPMSM) position control systems. A model-based predictive position controller and a model-free predictive current controller (MFPCC) for IPMSMs are investigated here. The proposed predictive controllers can improve the dynamic responses, including transient, load-disturbance, and tracking responses. In addition, the proposed MFPCC does not require any parameters such as inductance, resistance, or back-electromotive force of the IPMSM, and its performance does not deteriorate because of variations in the virtual dc-link voltage. Only the stator current difference is used to predict the future sampling current. A detailed stability analysis of the current-loop control and position-loop control of the IPMSM position control system is discussed. Several experimental results are included to validate the theoretical analysis. The experimental results show that the proposed predictive controllers have better performance than PI controllers. A 32-bit digital signal processor, a TMS-320LF-2407A, is used to execute the predictive controllers. The proposed control system is easily applied in industry due to its systematic design procedure.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Modified Model Predictive Control for Bidirectional Four-Quadrant EV
           Chargers With Extended Set of Voltage Vectors
    • Authors: Tingting He;Jianguo Zhu;Dylan Dah-Chuan Lu;Linfeng Zheng;
      Pages: 274 - 281
      Abstract: This paper presents a modified model predictive control (MMPC) for bidirectional power flow control between the electric vehicle (EV) chargers and the main grid. In contrast to the conventional finite control set MPC which selects an optimal switching state from eight possible voltage vectors, the proposed MMPC is based on the application of an optimal voltage vector chosen from an extended set of 20 modulated voltage vectors with a fixed duty ratio. To reduce the computational burden introduced by the increased number of voltage sets, a preselection algorithm is developed for the MMPC method. Six voltage vectors are preselected from the 20 sectors. Due to the increased number of the voltage space vectors, the grid currents and active and reactive power performance can be improved by using the proposed MMPC scheme. Both the conventional and proposed methods are compared through experimental test results of a two-level three-phase off-board EV charger.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Prediction-Error-Driven Position Estimation Method for Finite-Control-Set
           Model Predictive Control of Interior Permanent-Magnet Synchronous Motors
    • Authors: Zhuoyi Chen;Jianqi Qiu;Mengjia Jin;
      Pages: 282 - 295
      Abstract: This paper proposes a prediction-error-driven position estimation method based on the current prediction errors of the finite-control-set model predictive control (FCS-MPC) for the position-sensorless control of interior permanent-magnet synchronous motors, which operate in the whole speed range, including zero speed. The method is customized for FCS-MPC with which switching devices are directly controlled without modulators, whereas the conventional sensorless control methods usually presume the use of modulators. In the low-speed region, the proposed method fully exploits the inherent excitation of the discrete switching of the FCS-MPC to extract the position information. Under the low-current condition, an active vector injection technique is designed to automatically maintain sufficiently rich excitation for the position estimation while exerting a minimum impact on the fundamental control. The resultant current ripples and acoustic noises are lower compared with conventional injection methods. A novel initial polarity detection method based on magnetic saturation effect and inductance identification is also proposed to prevent pole ambiguity. The high-speed region position estimation uses the excitation from the back electromotive force, which is also reflected in the current prediction errors, permitting the use of one simple linear estimator in the whole speed range. Finally, the effectiveness and benefits of the proposed method are validated by experimental results.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Predictive Voltage Control of Direct Matrix Converters With Improved
           Output Voltage for Renewable Distributed Generation
    • Authors: Jianwei Zhang;Li Li;David G. Dorrell;Margarita Norambuena;Jose Rodriguez;
      Pages: 296 - 308
      Abstract: This paper proposes a predictive voltage control strategy for a direct matrix converter used in a renewable energy distributed generation (DG) system. A direct matrix converter with LC filters is controlled in order to work as a stable voltage supply for loads. This is especially relevant for the stand-alone operation of a renewable DG where a stable sinusoidal voltage, with desired amplitude and frequency under various load conditions, is the main control objective. The model predictive control is employed to regulate the matrix converter so that it produces stable sinusoidal voltages for different loads. With predictive control, many other control objectives, e.g., input power factor, common-mode voltage, and switching frequency, can be achieved depending on the application. To reduce the number of required measurements and sensors, this paper utilizes observers and makes the use of the switch matrices. In addition, the voltage transfer ratio can be improved with the proposed strategy. The controller is tested under various conditions including intermittent disturbance, nonlinear loads, and unbalanced loads. The proposed controller is effective, simple, and easy to implement. The simulation and experimental results verify the effectiveness of the proposed scheme and control strategy. This proposed scheme can be potentially used in microgrid applications.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Novel Model Predictive Control Strategy to Eliminate Zero-Sequence
           Circulating Current in Paralleled Three-Level Inverters
    • Authors: Xiaodong Wang;Jianxiao Zou;Jiancheng Zhao;Chuan Xie;Kai Li;Mudassir Munir Hafiz;Josep M. Guerrero;
      Pages: 309 - 320
      Abstract: The main contribution of this paper is the proposal of a novel finite control set model predictive control (MPC)-based zero-sequence circulating current (ZSCC) elimination strategy for parallel operating three-level inverters without any modification or extra hardware on the three-level inverters. An equivalent model of the ZSCC is first developed, and the voltage differences of common-mode voltages (CMVs) among paralleled inverters as well as those of the neutral point potentials (NPPs) are proved to be the exciting sources of the ZSCC. With the analysis, an MPC-based zero CMV method (ZCMV-MPC) is presented to reduce the difference of CMVs among the paralleled inverters, meanwhile, an active NPP perturbation-based ZSCC feedback control method is proposed to further eliminate the ZSCC, that may be caused by dead-time effects and the asymmetries of both hardware and control parameters. With the proposed method, the ZSCC between paralleled inverters can be eliminated effectively, and both grid current tracking and NPP balance control can also achieve satisfactory performances. Simulation and experimental results supported the theoretical study and verified the effectiveness of the proposed scheme.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Model Predictive Control of Six-Phase Induction Motor Drives Using Two
           Virtual Voltage Vectors
    • Authors: Juan J. Aciego;Ignacio González Prieto;Mario J. Duran;
      Pages: 321 - 330
      Abstract: Finite-control set model predictive control (FCS-MPC) has been successfully applied to three-phase electric drives and has proven to bring fast dynamics and high flexibility. The extension of FCS-MPC to regulate machines with more than three phases (i.e., multiphase) presents, however, additional challenges. Leaving aside the higher computational requirements, the appearance of additional degrees of freedom requires a simultaneous current tracking in different subspaces. Hence, the accuracy in the fundamental plane needs to be accomplished with no simultaneous excitement of the secondary planes in order to avoid unacceptable inefficiencies. This paper jointly tackles the performance improvement of fundamental and secondary planes following a two-step procedure: individual virtual voltage vectors (VVs) first ensure low circulating currents and the optimal combination of two VVs provides enhanced current tracking in the fundamental plane. Comparative experimental results confirm the satisfactory performance of the proposed strategy.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Analysis and Control of a Novel Modular-Based Energy Router for DC
           Microgrid Cluster
    • Authors: Chunming Tu;Fan Xiao;Zheng Lan;Qi Guo;Zhikang Shuai;
      Pages: 331 - 342
      Abstract: Energy router is one of the key elements for power electronic-based DC micro-grid (DCMG) cluster system. Traditional ac/dc converter and solid-state transformer can act as an energy router, but their functions and interfaces are restricted. In this paper, a novel modular-based energy router (MBER) for DCMG cluster has been proposed to extend the functions of energy router. Each module of MBER is composed of an ac/dc converter and an isolated dual-active-bridge converter with high-frequency transformers. The power multidirectional exchange mechanism between ac grid and DCMG cluster is shown. Then, the operation mechanism and the operation modes of MBER are analyzed. Considering the operation range of MBER is limited by the operation modes and the dc voltage of each module, a dc voltage adjustment strategy and the control method have been proposed to expand the operation range of MBER. Finally, the simulation and experimental results are presented to validate the proposed topology and control methods.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Evaluation of Power Processing in Series-Connected Partial-Power
    • Authors: Jonatan Rafael Rakoski Zientarski;Mário Lúcio da Silva Martins;José Renes Pinheiro;Hélio Leães Hey;
      Pages: 343 - 352
      Abstract: This paper proposes an analytical methodology to evaluate the power processed by dc–dc converters operating as series voltage regulators, which provide an alternative to increase efficiency in photovoltaic systems. Via the analysis of both active and nonactive power processing, the proposed methodology allows to clearly distinguish among circuit topologies as truly partial-power processing (PPP) or just partial active power processing topologies. When an isolated dc–dc topology is connected in series as a voltage regulator, the overall processed power can be reduced, which reduces power losses and improves efficiency. Conversely, this paper also demonstrates that some series-regulator topologies may not actually reduce the proportion of nonactive processed power. To demonstrate the applications of the proposed methodology and to emphasize its significance, two well-known series-connected voltage regulators (flyback and full-bridge phase shift) and a full-power regulator (boost) were evaluated. The results indicate that the full-bridge series regulator can perform a true PPP, whereas the flyback series-regulator processes the same amount of power as that processed by conventional nonisolated boost converters and cannot be considered a partial-power topology. This study finding contradicts assertions in the literature that this topology achieves high-efficiency dc–dc conversion through PPP. To confirm the theoretical analysis, experimental results from three 750-W prototypes are presented alongside its simulations.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Low Gate Turn-OFF Impedance Driver for Suppressing Crosstalk of SiC
           MOSFET Based on Different Discrete Packages
    • Authors: Yan Li;Mei Liang;Jiangui Chen;Trillion Q. Zheng;Haobo Guo;
      Pages: 353 - 365
      Abstract: Because of higher switching speed of silicon carbide MOSFET, the crosstalk in a phase-leg configuration will be more serious, which hinders the increase of switching frequency and lowers the reliability of the power electronic equipment. The displacement current of the gate–drain capacitor and the voltage drop on the common-source inductors can induce the crosstalk. In order to suppress the crosstalk, this paper proposes a novel gate driver, in which two additional capacitors are added to create the low turn-off gate impedance. With this proposed driver, the common-source parasitic inductor can be decoupled from the gate loop and the displacement current of the gate–drain capacitor can be bypassed. In addition, the operating principle and the parameters design are also analyzed. Finally, the crosstalk in the non-Kelvin package and the Kelvin package are tested by experiments, the validity of the analysis and the effectiveness for suppression the crosstalk are proved as well.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Unified Discrete-Mapping Model and Dynamical Behavior Analysis of
           Current-Mode Controlled Single-Inductor Dual-Output DC–DC Converter
    • Authors: Shuhan Zhou;Guohua Zhou;Shaohuan Zeng;Shungang Xu;Hongbo Ma;
      Pages: 366 - 380
      Abstract: Buck type, boost type, and buck–boost type are basic topologies of single-inductor dual-output (SIDO) dc–dc converters. Current-mode controlled SIDO dc–dc converters have three current borders in wide-range parameter variations. According to the change of inductor current which presents five trends of “up–down–down,” “up–up–down,” “up–down–up,” “down–up–down,” and “up–down,” the corresponding current borders are defined. On this basis, a unified discrete-mapping model of five inductor current trends is established and the boundary equations of system stability and mode shifting are derived in the meantime. The dynamic behaviors with the variations of circuit parameters in different inductor current trends are analyzed in detail by numerical simulation, and theoretical analyses of period-doubling bifurcation and tangent bifurcation are presented to validate the simulation results. The research results indicate that the SIDO dc–dc converter has different bifurcation sequences with the same circuit parameter varying for different inductor current trends. Operating regions of the converter are given in this paper, which provides theoretical guidance in designing current-mode controlled SIDO dc–dc converters. The experimental results are presented to verify the correctness of theoretical analysis and unified discrete-mapping model.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Control of Modular Multilevel Converters Using an Overlapping Multihexagon
           Space Vector Modulation Scheme
    • Authors: Oghenewvogaga James Komoda Oghorada;Li Zhang;Ikenna Bruce Efika;Chigozie John Nwobu;
      Pages: 381 - 391
      Abstract: This paper introduces a novel space vector modulation scheme that can be applied for the control of modular multilevel cascaded converters (MMCCs) with any number of levels. This is achieved by using basic two-level or three-level hexagons to determine the switch states and the duty cycles separately within one tier of the converter which is a cascade of three-level ${H}$ -bridge, five-level flying capacitor, or neutral point-clamped inverters. Many such hexagons can be overlapped, with phase shift relative to each other, for the control of a complete MMCC, instead of extending a single hexagon to regions corresponding to the number of levels. This approach simplifies the modulation algorithm and brings flexibility in shaping the output voltage waveforms. Also, this proposed method achieves good waveform quality at low switching frequency, hence resulting in low switching losses. Simulation and experimental results are presented to verify the advantageous features of the method.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • An Adaptive Thermal Equivalent Circuit Model for Estimating the Junction
           Temperature of IGBTs
    • Authors: Zhen Hu;Mingxing Du;Kexin Wei;William Gerard Hurley;
      Pages: 392 - 403
      Abstract: Implementation of real-time health assessment and thermal management of insulated gate bipolar transistors (IGBTs) require thermal equivalent circuit models that can be used to predict the junction temperature of the modules. Solder aging in IGBTs has a substantial impact on the accuracy of junction temperatures estimated by the models. This paper proposes an adaptive thermal equivalent circuit model that can estimate the junction temperature of IGBTs with precision under solder aging conditions. First, the solder aging process is monitored in real time by the temperature gradient of the baseplate of the IGBT module, which is easily implemented by placing two thermal sensors at the interface between the baseplate and the cold plate. Then, when the solder aging is detected, the actual junction temperature obtained by an ON-state collector–emitter voltage of the IGBT is utilized to update model parameters based on the thermal behavior of the device. By combining the two stages, the effect of solder aging on the accuracy of the junction temperature estimate is removed in time. Simulation and experimental results are provided to verify the effectiveness of the proposed method.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Modulated Model-Predictive Control With Optimized Overmodulation
    • Authors: Cristian F. Garcia;Cesar A. Silva;Jose R. Rodriguez;Pericle Zanchetta;Shafiq A. Odhano;
      Pages: 404 - 413
      Abstract: Finite-set model-predictive control (FS-MPC) has many advantages, such as a fast dynamic response and an intuitive implementation. For these reasons, it has been thoroughly researched during the last decade. However, the waveform produced by FS-MPC has a switching component whose spread spectrum remains a major disadvantage of the strategy. This paper discusses a modulated model-predictive control that guarantees a spectrum switching frequency in the linear modulation range and extends its optimized response to the overmodulation region. Due to the equivalent high gain of the predictive control and to the limit on the voltage actuation of the power converter, it is expected that the actuation voltage will enter the overmodulation region during the large reference changes or in response to load impacts. An optimized overmodulation strategy that converges toward the FS-MPC ’s response for large tracking errors is proposed for this situation. This technique seamlessly combines PWM’s good steady-state switching performance with FS-MPC ’s high dynamic response during large transients. The constant switching frequency is achieved by incorporating modulation of the predicted current vectors in the model-predictive control of the currents in a similar fashion as the conventional space-vector pulsewidth modulation is used to synthesize an arbitrary voltage reference. Experimental results showing the proposed strategy’s good steady-state switching performance, its FS-MPC -like transient response, and the seamless transition between modes of operation are presented for a permanent magnet synchronous machine drive.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Chebyshev Partition-Based Modulation Technique Applied to Power Converters
    • Authors: Concettina Buccella;Carlo Cecati;Maria Gabriella Cimoroni;Hassan A. Khalid;
      Pages: 414 - 421
      Abstract: In this paper, a new modulation technique is proposed for three-phase voltage-source inverters (VSIs). It is based on time partition obtained by Chebyshev polynomials’ zeros of the first kind which are used to build up nonuniform recursive sampling. A detailed mathematical description of the method and its implementation are given. Obtained results show that the proposed technique gives a total harmonic distortion factor lesser than conventional sinusoidal pulsewidth modulation under the same loading conditions. By comparing results obtained by proposed technique with results carried out by the wavelet modulation method, it is shown that they are very close. The proposed modulation returns lesser switching losses in comparison to sinusoidal pulsewidth modulation and space vector modulation. A MATLAB code that generates switching pulses to activate a Simulink model of the three-phase VSIs is developed to implement the proposed Chebyshev modulation technique. Experiments verify the correctness of the proposed method.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Load-Independent Voltage and Current Transfer Characteristics of
           High-Order Resonant Network in IPT System
    • Authors: Jianghua Lu;Guorong Zhu;Deyan Lin;Siu-Chung Wong;Jin Jiang;
      Pages: 422 - 436
      Abstract: Load-independent output characteristics of an inductive power transfer (IPT) system are of increasing interest in electric vehicle and LED lighting applications. All compensation networks in the IPT system are actually high-order resonant circuits. In a high-order resonant network, there are multiple resonant frequencies to get load-independent voltage output and current output. It is critical to analyze the resonant conditions to achieve high efficiency in both load-independent voltage output and current output modes. This paper proposed a general modeling method for arbitrary high-order resonant networks to get both the load-independent voltage and current transfer characteristics. A high-order circuit can be modeled as a combination of an LC network, a multistage T-circuit, and/or multistage $Pi $ -circuit in series. The proposed method is verified by applying to voltage-fed double-sided inductor–capacitor–capacitor (LCC), series–series (SS), S-SP, LCC-S, and current-fed CLC-LC compensation networks in the IPT system. The MATLAB simulation and the experimental prototype of a constant voltage-fed double-sided LCC compensated IPT system with up to 3.3-kW power transfer are built. The efficiency of the double-sided LCC compensated IPT system is up to 92.9% and 90.6% when the IPT system operates at resonant frequencies that achieve constant current output and constant voltage output, respectively, which are compliance with the frequency requirement by SAE J2954 standard.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Flux-Weakening in PMSM Drives: Analysis of Voltage Angle Control and the
           Single Current Controller Design
    • Authors: Zisui Zhang;Chenchen Wang;Minglei Zhou;Xiaojie You;
      Pages: 437 - 445
      Abstract: Voltage angle control not only can solve the problem that two current regulators of traditional algorithms conflict with each other but also has the advantage of maximum utilization of the dc-link voltage. Based on the basic equations of permanent-magnet synchronous motors (PMSM) in $i_{d}$ – $i_{q}$ coordinate plane, the principle of voltage angle control is analyzed and a single $q$ -axis current regulator-variable voltage angle control method is proposed as the novel approach for the flux-weakening operation of PMSM over a wide range of speed in motoring and generating mode. The proposed method enables the fast dynamic response of current when current reference changes and eliminates the transition between the motoring and generating operation. The results of simulation and experiment demonstrate the effectiveness of the proposed control method.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Investigation of Fault-Tolerant Capabilities in an Advanced Three-Level
           Active T-Type Converter
    • Authors: Ramin Katebi;Jiangbiao He;Nathan Weise;
      Pages: 446 - 457
      Abstract: A novel fault-tolerant three-level power converter topology, named advanced three-level active T-Type (A3L-ATT) converter, is introduced to increase the reliability of multilevel power converters used in safety-critical applications. This new fault-tolerant multilevel power converter is derived from the conventional T-Type converter topology. The topology has significantly improved the fault-tolerant capability under any open circuit or certain short-circuit faults in the semiconductor devices. In addition, under healthy condition, the redundant phase leg can be utilized to share overload current with other main legs, which enhances the overload capability of the converter. The conduction losses in the original outer devices can be reduced by sharing the load current with the redundant leg. Moreover, unlike other existing fault-tolerant power converters in the literature, full output voltages can be always obtained in this proposed A3L-ATT converter during fault-tolerant operation. A 13.5-kW ATT-A3L converter prototype was developed and constructed using silicon carbide MOSFETs. Simulation and experimental results were obtained to substantiate the theoretical claims of this new fault-tolerant power converter.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A New Tuning Method of Multiresonant Current Controllers for
           Grid-Connected Voltage Source Converters
    • Authors: Chuan Xie;Xin Zhao;Kai Li;Jianxiao Zou;Josep M. Guerrero;
      Pages: 458 - 466
      Abstract: Resonant controllers (RSCs) are widely adopted for controlling power converters, since they can track ac signals of both positive and negative sequences without steady-state error. However, the performance of RSCs has not been fully exploited due to the improper phase compensation angle and insufficient controller gain. In this paper, a novel controller parameters’ design method, which is based on the system error transfer function, is proposed to further explore the potential high performance of RSCs. Comparing with the conventional methods, more appropriate phase compensation angles can be obtained, which means that the stable region of the controller gain is extended. Since the proposed RSCs’ design method is able to maximize the controller gain, the controller sensitivity to system frequency variations can be decreased and the system response speed can be improved. The RSCs’ tuning procedure is given in detail, and comparative experiments between the proposed method and the conventional method are performed to validate the superiority of the proposed method.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Leakage-Inductance-Tolerant Commutation Strategy for Isolated AC/AC
    • Authors: Usman Nasir;Alessandro Costabeber;Marco Rivera;Pat Wheeler;Jon Clare;
      Pages: 467 - 479
      Abstract: This paper proposes a generalized commutation strategy suitable for matrix-based isolated ac/ac conversion stages in solid-state transformers for use whenever there is nonnegligible leakage inductance in the isolation transformer. The standard 4-step commutation used in matrix converters can no longer be applied when transformer leakage inductance is present, as overrated switching devices or dissipative snubbers would be necessary, reducing the attractiveness of the topologies that include matrix-based isolated ac/ac stages. A case study of a single-phase ac/ac converter has been investigated in detail to demonstrate the application of the proposed commutation method to a topology that has recently been identified as the potential building block for future multimodular ac/ac converters for grid applications. The proposed leakage-inductance-tolerant commutation strategy is based on the definition of a current decoupling phase in the commutation sequence and only needs suitable timing of the commutation steps, without high bandwidth voltage or current measurements. Matching simulations and experimental results from a 3-kW laboratory scale prototype are presented to support the effectiveness of the proposed strategy.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Circulating Current Suppression for Parallel Three-Level Inverters Under
           Unbalanced Operating Conditions
    • Authors: Changwei Qin;Chenghui Zhang;Alian Chen;Xiangyang Xing;Guangxian Zhang;
      Pages: 480 - 492
      Abstract: The parallel-operated three-level T-type inverters (3LT2Is) are increasingly used for large capacity renewable energy sources, which can increase power rating, efficiency, and reliability. However, the circulating current problem arises. Circulating current inevitably distorts output currents, increases power losses, and reduces the efficiency. Unbalanced operating conditions, including both unbalanced grid voltage and unbalanced filter parameters, cause adverse effects on the operation of parallel 3LT2Is. In this paper, a hybrid control scheme is developed to suppress the circulating current for parallel 3LT2Is under unbalanced operating conditions. An average model is derived and analyzed. Two quasi-resonant controllers are added to the conventional PI controller, and feed-forward control terms are introduced to eliminate the effects of disturbances in a zero-axis current system. Circulating current suppression is realized by real-time adjusting dwell times of small vectors in space vector modulation technique. A proportional controller is adopted to balance the neutral point voltage. Simulation and experimental results validate theoretical analysis and the effectiveness of the proposed scheme.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Harmonic Virtual Impedance Design for Parallel-Connected Grid-Tied
    • Authors: Javier Roldán-Pérez;Alberto Rodríguez-Cabero;Milan Prodanović;
      Pages: 493 - 503
      Abstract: In recent years, synchronverters have become a preferred control solution for the integration of renewable energy sources and battery systems to power networks. In this control strategy, the converter acts as a fundamental frequency voltage source and, as such, is unable to deal with harmonic power quality issues. In this paper, the harmonic control is frequently addressed using virtual impedances; however, they have been seldom studied for synchronverters. This paper presents a detailed design procedure for harmonic virtual impedances applied to parallel-connected synchronverters. The proposed method offers a tailor-made design of the converter output impedance and large stability margins. The method is used to decouple the dynamics of the synchronverter control, and the proposed virtual-impedance is explained in detail. The obtained results showed the output impedance of each synchronverter can be designed to achieve a tradeoff in power quality between current and voltage. In addition, the effect of frequency variations was explored and two solutions were provided and compared. All the control system improvements were experimentally validated using two 15-kVA battery-supported synchronverters connected to a distorted weak grid.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Model-Predictive-Based Duty Cycle Control With Simplified Calculation and
           Mutual Influence Elimination for AC/DC Converter
    • Authors: Xiaolong Shi;Jianguo Zhu;Li Li;Dylan Dah-Chuan Lu;
      Pages: 504 - 514
      Abstract: The single-vector-based model-predictive-based direct power control (MPDPC) is commonly used for control of three-phase full-bridge ac/dc converters, but it could only select the best switching vector to be implemented. Due to the limited number of voltage vectors in a two-level three-phase converter, the sampling frequency needs to be high to achieve an acceptable performance. Also, it bears variable switching frequency that causes spread spectrum nature of harmonics. In this paper, a three-vector-based simplified model predictive duty cycle control (SMPDCC) is proposed. The adjacent two nonzero vectors are selected by evaluating the effects of each vector pairs based on the revised cost function. The duration calculation is simplified compared with the conventional predictive duty cycle control (CPDCC) by allocating a control period in reciprocal proportion with the corresponding cost function value of the selected vectors. Besides, the negative duration issue of CPDCC could be completely avoided and the mutual influence elimination ability could be realized. A comparative study with MPDPC and CPDCC has been conducted to verify the superiority of the proposed scheme by the simulation and experimental results. It shows that the SMPDCC has the advantages of lower power ripple, fixed switching frequency, lower total harmonic distortion, and mutual influence elimination ability.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Comparative Experimental Evaluation of Zero-Voltage-Switching Si Inverters
           and Hard-Switching Si and SiC Inverters
    • Authors: Gabriele Rizzoli;Michele Mengoni;Luca Zarri;Angelo Tani;Giovanni Serra;Domenico Casadei;
      Pages: 515 - 527
      Abstract: Several efforts have been put in the reduction of the power losses of dc–ac converters by investigating soft-switching topologies, which have been reported to boost efficiencies of silicon inverters up to 99%. However, the auxiliary circuits of the switches significantly impact on the circuit complexity. Conversely, the use of wide bandgap devices offers an alternative for the reduction of the losses, while keeping the simple structure of a traditional inverter. This paper aims to experimentally evaluate the performance of four prototypes in terms of efficiency and costs. Two zero-voltage switching inverters, differing only in the power switches, and two comparable hard-switching inverters, mounting both silicon and silicon carbide devices, have been built and compared. Overall, the soft-switching inverters allow improving the efficiency at high output current in comparison with hard-switching Si inverters, but their efficiency is comparable to that of silicon carbide (SiC) inverters or even lower at low output currents. The economic analysis has shown that the cost of the power stage of the soft-switching inverters and the hard-switching SiC inverter is about 2.5 and 1.5 times that of the hard-switching inverter based on Si insulated gate bipolar transistors, respectively.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Comparative Study of Short-Circuit Fault Characteristics for VSC-Based DC
           Distribution Networks With Different Distributed Generators
    • Authors: Zhikang Shuai;Dong He;Zhijie Xiong;Zhiqi Lei;Z. John Shen;
      Pages: 528 - 540
      Abstract: Distributed power generation integration can effectively improve the reliability and economy of dc distribution network operation. However, it is difficult to evaluate the fault behaviors caused by the diversification of distributed generation, which might render preexisting protection schemes invalid and even cause damage to power electronic equipment. When different distributed generators access a voltage source converter (VSC)-based dc system, an in-depth study of fault characteristics is of great significance to design relay protection. This paper investigated the short-circuit fault characteristics of VSC-based dc distribution networks containing distributed generation systems. The fault responses of different fault stages for three kinds of distributed generators (photovoltaic power system, supercapacitor energy storage system, and wind power generation system) were investigated to provide an intuitive comparison of fault behaviors. The effects of these distributed generators on the magnitude and peak time of fault current were analyzed. It was found that the dc cable parameters and these distributed power generators’ dc-link capacitors have great impacts on the fault behaviors of dc distribution networks. Detailed analyses based on MATLAB calculations are presented, and simulation results based on power systems computer aided design/electromagnetic transients including dc verified the effectiveness of the proposed transient fault models.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Novel Multiphase High Step-Up DC/DC Boost Converter With Lower Losses on
    • Authors: Mohammad Maalandish;Seyed Hossein Hosseini;Saeed Ghasemzadeh;Ebrahim Babaei;Tohid Jalilzadeh;
      Pages: 541 - 554
      Abstract: In this paper, a new multiphase interleaved dc/dc converter is presented. The proposed converter consists of two symmetric sections. Each section consists of several switches, inductors, diodes, and capacitors. In order to obtain high voltage gain, the proposed converter can be extended to n stages of voltage multiplier units which are used between the phases. Hence, the voltage gain of the proposed transformerless converter will be significantly high. In addition, the other advantage of the proposed converter not only contains lower voltage stress on the semiconductors but also leads to high efficiency for different values of duty cycles. The value of input current ripple is low due to using the interleaved technique. To illustrate the merits of the presented converter, comparison results with other converters are provided. The principle of operation in three-phase case, both theoretical analysis and experimental results of two prototype in different ranges with operating at 25 kHz are provided.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • A Novel High-Power-Factor AC/DC LED Driver With Dual Flyback Converters
    • Authors: Hung-Liang Cheng;Yong-Nong Chang;Chien-Hsuan Chang;Shih-Yuan Hsieh;Chun-An Cheng;
      Pages: 555 - 564
      Abstract: This paper proposes a novel ac/dc light-emitting diode driver. The circuit configuration consists of a low-pass filter, a diode rectifier, and two flyback converters which are interleaved operated with 180° phase shift. Although both flyback converters lose the capability of galvanic isolation in this proposed circuit, the active switch of each converter can achieve zero-voltage switching without needing to use the additional active clamping circuit or snubber circuit. Also, the energy stored in the leakage inductance of the coupled inductor can be either recycled or supplied to the output load, resulting in high circuit efficiency and low product cost. Besides, high power factor and low total current harmonic distortion are obtained by operating the flyback converters in discontinuous current mode. The steady-state analyses of different operation modes and the design criteria for circuit parameters are provided. Finally, a 200-W prototype circuit was implemented. Satisfactory performances are obtained from the experimental results.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • High Step-Up Nonisolated ZVS/ZCS DC–DC Converter for Photovoltaic
           Thin-Film Module Applications
    • Authors: Lenon Schmitz;Denizar C. Martins;Roberto F. Coelho;
      Pages: 565 - 575
      Abstract: Photovoltaic (PV) thin-film modules normally present higher voltages at the maximum power points than crystalline silicon ones. This feature makes the usage of low-voltage MOSFETs (≤100 V) unfeasible in high step-up boost-based converters. In order to solve this drawback, this paper proposes a novel high step-up nonisolated dc–dc converter based on the classical synchronous buck converter with coupled inductor and voltage multiplier techniques. Besides reducing the voltage stress on the active switches, the proposed converter also requires a coupled inductor with lower core-window product, allowing the use of a smaller magnetic device. The resonant operation mode of the proposed converter enables zero-voltage-switching turn-on of active switches and zero-current-switching turn-off of diodes, which increases its efficiency. A 150-W prototype, able to work with a large variety of commercial PV thin-film modules, with 55–85-V input and 400-V output voltages, is built to verify the developed analysis. Experimental results show that the maximum obtained efficiency is nearly 98%, and the weighted California Energy Commission efficiencies are greater than 96.7% over the whole input voltage range.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Differential Mode Active EMI Filter Design for a Boost Power Factor
           Correction AC/DC Converter
    • Authors: Rajib Goswami;Shuo Wang;Eugene Solodovnik;Kamiar J. Karimi;
      Pages: 576 - 590
      Abstract: The objective of this paper is to introduce a methodology to design an active differential mode (DM) filter at the input side of ac/dc converters to cancel DM electromagnetic interference noise within concerned frequency range. The boost power factor correction ac/dc converter was taken as an example for DM active filter design. The active filter is analyzed based on the developed DM noise model. The design of DM active filter to achieve desired insertion gain and stability is addressed in detail. Both simulations and experiments were conducted to validate the proposed methodology. It is found that the proposed design methodology can meet the design objective and the stability challenge for the DM active filter of ac/dc converters.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • Analysis of Partial Power DC–DC Converters for Two-Stage
           Photovoltaic Systems
    • Authors: Jaime W. Zapata;Samir Kouro;Gonzalo Carrasco;Hugues Renaudineau;Thierry A. Meynard;
      Pages: 591 - 603
      Abstract: Two-stage photovoltaic (PV) configurations have become increasingly popular due to the decoupling between the inverter dc-link voltage and the PV voltage, adding flexibility to extend the maximum power point tracking range. However, the additional dc–dc converter increases the power converter losses. The concept of partial power converters (PPCs), which reduce the amount of power handled by the dc stage, can mitigate this effect. However, the type of topology, its power and voltage rating, efficiency, and an operating range can vary significantly depending on the function (boosting or reducing voltage) and type of PV application and scale (micro-, string-, or multi-sting inverter). This paper analyzes the possible configuration of connections of PPC depending on the application and scale of the PV system and introduces a new buck-type PPC. Three solutions for practical PV systems are further elaborated, including experimental validation. Results show that the PPC concept greatly improves the overall PV system efficiency with the added benefit that the dc–dc stage power ratings achieved are only a fraction of the PV system, reducing size and cost of the power converter without affecting the system performance.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
  • how can you get your idea to market first
    • Pages: 604 - 604
      Abstract: Advertisement, IEEE.
      PubDate: March 2019
      Issue No: Vol. 7, No. 1 (2019)
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