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  Subjects -> ELECTRONICS (Total: 184 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: 6)
Advances in Electronics     Open Access   (Followers: 79)
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: 318)
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: 267)
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 106)
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: 93)
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: 195)
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: 67)
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: 20)
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: 70)
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: 25)
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: 4)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 6)
International Journal of Control     Hybrid Journal   (Followers: 11)
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 Hybrid Intelligence     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: 25)
Journal of Electrical Bioimpedance     Open Access  
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   (Followers: 2)
Journal of Field Robotics     Hybrid Journal   (Followers: 3)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 169)
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: 29)
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 ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer     Open Access  
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: 19)
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)
Revue Méditerranéenne des Télécommunications     Open Access  
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 54)
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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Journal Cover
IET Power Electronics
Journal Prestige (SJR): 0.803
Citation Impact (citeScore): 3
Number of Followers: 46  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1755-4535 - ISSN (Online) 1755-4543
Published by IET Homepage  [42 journals]
  • Review and re-evaluation of modulation techniques for
           neutral-point-clamped inverters with high-order filters
    • Authors: Fen Tang;Jiazhi Liang;Jiuchun Jiang;Zhen Xin;Songwei Huang;Poh Chiang Loh;
      Pages: 1307 - 1320
      Abstract: The centred space vector modulation scheme is considered to be the best since it produces the least switching harmonics among the modulation techniques developed for neutral-point-clamped (NPC) inverters. However, this common belief was concluded in the condition when inverters interfaced to the grid with a simple inductor filter. Nevertheless, to achieve an excellent harmonic attenuation performance, higher-order filter is much preferred for NPC inverter. Consequently, the aforementioned common belief may lose its correctness due to the distinctive resonance characteristics accompanied by high-order filters. The objective is to review and re-evaluate the performances of the commonly used modulation techniques for NPC inverters when different high-order filters are applied. Furthermore, this study provides a guide to choose an appropriate modulation scheme when high-order filters are used. The sinusoidal pulse-width modulation with alternative phase opposition disposition shows the best performance since it always ensures high-quality current waveforms when high-order filters are used in NPC inverters. Apparently, this conclusion is against the common belief. Moreover, different conclusions in terms of the performances have also been found for other modulation techniques considered in this review. Finally, to validate the correctness of the analysis and the findings, simulated and experimental results are provided and discussed.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Modelling and analysis of the distortion of strongly-coupled wireless
           power transfer systems with SS and LCC–LCC compensations
    • Authors: Yiming Zhang;Zhengchao Yan;Tianze Kan;Yanding Liu;Chunting Chris Mi;
      Pages: 1321 - 1328
      Abstract: Accurate modelling is necessary for designing a wireless power transfer (WPT) system and currently, first harmonic approximation (FHA) is widely used. However, it is not accurate for WPT systems with a strong coupling, such as fast charging of electric vehicles with a coupling coefficient of 0.80, compared to the conventional wireless charging with a coupling coefficient of 0.15-0.30. This study develops accurate models for WPT systems with series-series (SS) and LCC-LCC compensations. For the SS compensation with a strong coupling, the transmitter and receiver currents are distorted, leading to much larger values than the estimations from FHA, which determines the selection of power switches and resonant capacitors. For the LCC-LCC compensation, the transmission coil currents are only highly distorted with rich third-order harmonics at the vicinity of the 0.889 coupling coefficient, leading to low efficiency and large coil current ratings. For the experimental prototype, the efficiency drop can be over 3%, which is significant, especially for high-power systems. The WPT system with the LCC-LCC compensation should avoid operation in the vicinity of this particular coupling coefficient. Furthermore, experiments are conducted, and the results perfectly match the calculations, demonstrating the accuracy of the proposed models.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Class of high step-up switched Z-source inverters: steady state analysis
           and objective function
    • Authors: Mohsen Hasan Babayi Nozadian;Ebrahim Babaei;Seyed Hossein Hosseini;
      Pages: 1329 - 1340
      Abstract: In this study, high step-up switched Z-source inverters (HSZSIs) with two main groups namely types I and II are proposed. Each of these groups includes several proposed structures. Owing to the features of the proposed structures such as high boost factor (β), continuous input current, and low voltage stress; they can be used in different applications such as renewable power systems. By using the same numbers of the passive elements in comparison with a conventional Z-source inverter (ZSI), quasi-ZSI, and series ZSI (SZSI), the proposed structures produce a higher boost factor. A new objective function is defined so that all compared parameters can be investigated with each other simultaneously. The power losses and efficiency analyses for all of the proposed structures are done and compared with the conventional structures. It is shown that for Pout≃200 W, the measured efficiencies for basic HSZSI type I, quasi-HSZSI type I, basic HSZSI type II and quasi-HSZSI type II are 91, 85, 96, and 92%, respectively. In addition, the total harmonic distortion calculation, dynamic performance and designing a closed-loop control method for the proposed structures are shown. Finally, the experimental results are indicated for a 500 W prototype.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Improved active clamped ZVS buck converter with freewheeling current
           transfer circuit
    • Authors: Shaogui Fan;Li Sun;Jiandong Duan;Kai Zhang;
      Pages: 1341 - 1348
      Abstract: An improved active clamped zero-voltage switching (ZVS) buck converter with freewheeling current transfer circuit is proposed in this study. Comparing with the traditional active clamped ZVS buck converter, the current of freewheeling diode, the clamping voltage and duty cycle loss are all halved. The reduced current and voltage stress will result in high reliability and efficiency. Moreover, the reduced duty cycle loss will result in a low input voltage. In the improved converter, a small inductor and an auxiliary diode are added to build the freewheeling current transfer circuit. The operating principle of the improved converter is described. The analysis and design considerations of the proposed converter are given. A 1.2 kW prototype converter is set up to validate the improved converter.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • R DS(on) vs. inductance: comparison of SiC MOSFETs in 7pin D2Pak and 4pin
           TO-247 and their benefits for high-power MHz inverters
    • Authors: Fabian Denk;Karsten Haehre;Santiago Eizaguirre Cabrera;Christoph Simon;Michael Heidinger;Rainer Kling;Wolfgang Heering;
      Pages: 1349 - 1356
      Abstract: In this work, the authors present their investigations of the benefits of combining the latest silicon carbide MOSFETs with novel packages for electronic ballasts of inductively coupled plasmas. Such plasmas require MHz inverters with output powers above 2 kW. Additionally, for a breakthrough of the technology efficiencies >90% have to be realised. It has been shown that a combination is achievable with SiC FETs. Nevertheless, even though the transistors have undergone significant development in recent years, one limiting factor has mostly remained untouched. The common TO-247 package does not fit to the requirements of a fast switching application. Within the latest launch of the new generations of SiC MOSFETs, some are available in novel packages with kelvin source connection, like 4pin TO-247 and 7pin D2Pak. The authors compare three versions of the latest generation in a resonant full-bridge inverter and in application-oriented test. Thereby, the 7pin D2Pak and one of the 4pin TO-247 transistors were 65 mΩ devices and the second 4pin TO-247 FET was a 45 mΩ device. For the investigations, the authors made simulations, built three MHz inverters, and conducted measurements. Consequently, efficiencies of 93.9% could be achieved at a switching frequency of 2.5 MHz and an output power of Pout=2.6 kW.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Comprehensive study of fast load modulation with volt-second balance in a
           dual-active-bridge converter
    • Authors: Yu Tang;Xiaodong Li;Sheng-Zhi Zhou;Chuan Sun;Guo Chen;
      Pages: 1357 - 1367
      Abstract: The procedure of load transition in a dual-active-bridge converter is expected to be fast and spike free. To achieve such a goal, the total required adjustment of phase-shift angles should be assigned to different switch arms properly. This study discusses all possible combinations of two switch arms and their related phase-shifts, which could result in several different solutions. By forcing a zero algebraic variation of the volt-second product, all solutions can keep the volt-second balance of the power inductor so that no risk of magnetic saturation in the transient state exists. The possibility of temporal overshoot current can be checked by verifying the monotonicity of the intermediate volt-second product. A comparison of all solutions is made to give a suggestion for their feasibility. Experimental tests are included at last which validated the theoretical analysis.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Torque ripple suppression of permanent magnet synchronous machines by
           minimal harmonic current injection
    • Authors: Luocheng Yan;Yong Liao;Hao Lin;Jun Sun;
      Pages: 1368 - 1375
      Abstract: Reducing torque ripples in a permanent magnet (PM) synchronous machine (PMSM) system has been an essential requirement in some high-performance applications. To suppress the torque ripples caused by time harmonics and spatial harmonics, an approach based on injecting minimum harmonic currents is proposed here. The proposed method extracts torque ripples from speed fluctuations, and the gradient descent optimisation (GDO) is utilised to determine the injected harmonic currents which are the commands of the harmonic current regulators. Using the torque ripple minimisation and the injected harmonic current minimisation as the two objectives, the GDO not only minimises the torque ripples of the PMSM system but also guarantees that the magnitude of the injected harmonic currents is minimal. The proposed method is simple to implement in the hardware and does not require complex computation. Its effectiveness is verified by experimental results.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Family of half-bridge LLC resonant converters with auxiliary switches for
           hold-up operation
    • Authors: Xinxi Tang;Hongfei Wu;Jian Zhao;Yan Xing;
      Pages: 1376 - 1384
      Abstract: For applications with hold-up time requirement, the magnetising inductance of the conventional LLC converter must be designed small enough to provide required peak voltage gain. However, the efficiency in normal operation will be decreased when considering the gain requirement. Here, a family of half-bridge (HB) LLC resonant converters is proposed for low-voltage and high-current applications. In order to provide the required voltage gain, auxiliary switches are introduced into parts of the secondary-side rectifiers. In the normal state, the auxiliary switches keep off and high efficiency can be achieved since the proposed converter always operates around the resonant frequency. Without considering the voltage gain requirement, soft-switching is the only consideration for the design of the magnetising inductance. Therefore, circulating current and conduction losses induced by the magnetising inductance can be reduced significantly. During the hold-up time, the auxiliary switches operate with pulse-width modulation (PWM) control to provide sufficient voltage gain. Furthermore, matrix transformers are engaged to simplify the winding structure and increase the output current capability. Operation principles, characteristics, and design considerations of the proposed LLC resonant converter are analysed in detail. Experimental results are given to verify the effectiveness and the advantages of the proposed converter.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Emphasis on switch selection and its switching loss comparison for
           on-board electric vehicle charger
    • Authors: Manaswi Srivastava;Pavan Singh Tomar;Arun Kumar Verma;
      Pages: 1385 - 1392
      Abstract: A DC/DC converter plays a vital role in on-board electric vehicle (EV) charger. Among the many converter topologies, the phase-shifted full-bridge DC/DC converter (PSFBDC) is widely used. For improved efficiency, PSFBDC is embedded with passive auxiliary networks resulting in several unique configurations for achieving soft-switching in entire load range. The architecture of the chosen DC/DC converter configuration should comply with the society of automotive engineers (SAE) standards. Although, the conduction loss of the converter can be minimised by choosing a proper topology configuration and proper switching of the configuration, the selection of appropriate for PSFBDC plays an important role in enhancing the overall efficiency. An optimistic method for the selection of switch configuration satisfying the reduced power loss and cost-effective aspects is presented. For demonstrating the proposed method, a 1 kW 100 kHz system with commercially available switches IRFP460, IXFN64N60P, and IPP65R045C7 is chosen and the obtained results are presented.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Improved core loss calculation method considering the non-uniform
           distribution of magnetic flux density in powder cores
    • Authors: Yuki Ishikura;Jun Imaoka;Mostafa Noah;Masayoshi Yamamoto;
      Pages: 1393 - 1399
      Abstract: Utilising powder cores in many power electronics applications have gained much attention due to the attractive magnetic properties of powder core materials. However, the magnetic flux density distribution is non-uniform along the core because the flux is dependent on the core geometry and due to the low relative permeability of the powder core material. The non-uniformity of the magnetic flux density distribution may cause huge calculation errors of core losses. Understanding the effect of the magnetic flux non-uniformity in the powder cores allows the circuit designer to accurately estimate the core losses in powder cores. This work addresses the negative effect of the inherent non-uniform magnetic flux density distribution on the core loss. Furthermore, an equivalent circuit to consider the non-uniform of the magnetic flux density distribution is proposed. The proposed circuit enables the core loss to be estimated more precisely. A reduction of 12% in the core loss measurement error has been reported while utilising the proposed circuit compared to traditional equivalent circuits. Along with the theoretical discussion, finite element method simulation and experimental results are also presented to evaluate the proposed core loss calculation method.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Improved hybrid modular multilevel converter with enhanced fault
           ride-through capability and fast pre-charging strategies
    • Authors: Dongye Li;Zhendong Ji;Yichao Sun;Jianfeng Zhao;Jiaxing Lei;Yue Yue;
      Pages: 1400 - 1412
      Abstract: This study proposes an improved hybrid modular multilevel converter (MMC) topology with enhanced fault ride-through capability and fast pre-charging strategies. This improved MMC topology mainly consists of the half-bridge sub-modules (HBSMs), the modified series connected double sub-modules (MSDSMs), and the adjustable damping sub-module (ADSM). In the improved topology, in addition to being configured on the MMC AC-side, resistors are also configured in MSDSMs and ADSM, respectively, in the MMC. This type of resistance configuration based on the improved MMC topology benefits adjusting the value of the total equivalent current limiting resistance during the pre-charging process, leading to a higher pre-charging speed and a lower SM voltage drop risk. Three different pre-charging strategies can cope with changes in resistance configuration caused by the increasing number of SMs. Furthermore, the resistances in MSDSM and ADSM also help dissipate the energy caused by the DC short-circuit fault so that the fault ride-through capacity is enhanced. The simulation and experimental results validate the effectiveness of the proposed topology and the corresponding pre-charging strategies.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Robust three degrees of freedom based on H∞ controller of
           voltage/current loops for DG unit in micro grids
    • Authors: Allal El Moubarek Bouzid;Pierre Sicard;Hicham Chaoui;Ahmed Cheriti;
      Pages: 1413 - 1424
      Abstract: This study proposes a cascaded voltage-current robust control strategy for a distributed generator (DG) in microgrids. The main objective of the proposed controller is to improve the performance and power quality of a DG by injecting simultaneously a good sinusoidal voltage/current to the different loads connected to the DG. The proposed cascaded voltage/current controller consists of three degree-of-freedom controller, which is designed by using H∞ control theory based on mixed sensitivity specifications. The choices of appropriate weighting functions Wt, Wu, Wy that satisfy the preset goals to get a robust controller and a transform to a standard H∞ control design problem based on pre-compensator, feedforward and feedback connections are presented. The 3DOF-controller is based on MATLAB R/SimPowerSystems and using RT-EVENTS-toolbox. The controller is evaluated under different scenarios: transient responses with a resistive local load, and loads disturbances in steady-state responses with resistive, resistive inductive, resistive capacitive, and non-linear loads. Simulation and experimental results of resulting waveforms from a DG unit are presented, it confirms the effectiveness of the proposed method in effectively rejecting perturbation and robustness to loads disturbances; both good reference tracking and good transient response, and finally significantly lead to a very low total harmonic distortion.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Non-isolated buck–boost dc–dc converter with quadratic voltage gain
    • Authors: Saman A. Gorji;Ali Mostaan;Hung Tran My;Mehran Ektesabi;
      Pages: 1425 - 1433
      Abstract: A new transformer-less buck-boost converter is proposed, which owns a quadratic voltage gain ratio. The proposed converter (a) has only one active switch, which makes the implementation of the gate driver and control system simpler; (b) has a quadratic voltage gain without using a transformer, which equips the designers to obtain a high-voltage gain ratio and avoid the complexity of magnetic utilisations; (c) works both in step-up or step-down mode, while most of the existing quadratic topologies are able to work either in step-up or step-down mode; and (d) shares a common ground between the input and output terminals. The operating states of the proposed converter along with its steady-state performance are analysed. Then, the small-signal modelling and the power loss analysis are performed. A comparison shows the unique features of the converter, specifically in terms of voltage gain ratio and the count of power switches. Finally, the experimental results of a laboratory prototype, as well as the simulation results from PSIM software, are used for validation. The converter was tested in different conditions to inspect its transient response and to record its efficiency. The maximum recorded efficiencies in boost and buck modes, respectively were 94.7 and 93%.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Optimal finite state predictive direct torque control without weighting
           factors for motor drive applications
    • Authors: Paul Gistain Ipoum-Ngome;Daniel L. Mon-Nzongo;Joseph Song-Manguelle;Rodolfo C.C. Flesch;Tao Jin;
      Pages: 1434 - 1444
      Abstract: An optimal finite state predictive direct torque control without flux and switching frequency weighting factors (WFs) is proposed to avoid the tuning of WFs and to provide high dynamic performances with reduced switching frequency and computational burden. The proposed method is a combination of the well-known direct torque control and multi-objective ranking (MOR) priority methods. The classical MOR, used to avoid the flux WF, increases the computation time compared to the standard predictive torque control (PTC) and does not consider switching frequency issues. These drawbacks impose the need for high sampling rates, which increase the implementation cost and the inverter power losses, an important issue for medium and high-power drives. In the proposed method, the direct torque control principle is used to reduce the number of voltage vectors from eight to three, which reduces the computational burden of MOR. Also, MOR is associated with a proposed priority scheme to reduce the switching frequency and avoid WFs. Simulation and experimental results confirm that similar steady-state response as in the traditional PTC based on MOR is obtained. However, fast transient response is achieved, the computational burden is reduced by about 25%, and the switching frequency is substantially reduced compared to classical PTC.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • High step-up SVMC-based DC/DC converter for offshore wind farms
    • Authors: Binxin Zhu;Song Liu;Don Mahinda Vilathgamuwa;Yang Li;
      Pages: 1445 - 1454
      Abstract: This study presents a high step-up scalable voltage multiple cell (SVMC)-based DC/DC converters, which have the features of high gain, low and adjustable components stresses and automatic input-current sharing in each input phase. In virtue of the above features, the converter is applicable for the DC collection grids for offshore wind farms. In this study, the converter in terms of working principle and property characteristics are analysed with four input phases and three SVMCs. The converter has also been evaluated in terms of the component stress and voltage conversion ratio against some other converters for high-power occasions. Moreover, a 2.5 MW simulation model and a 1.2 kW prototype were constructed for verification.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Virtual synchronous generator control strategy incorporating improved
           governor control and coupling compensation for AC microgrid
    • Authors: Zishun Peng;Jun Wang;Yeting Wen;Daqiang Bi;Yuxing Dai;Yong Ning;
      Pages: 1455 - 1461
      Abstract: Virtual synchronous generator (VSG) control strategy has been widely used in the AC microgrid in recent years. However, the VSG control strategy is lack of the decoupling ability, and its governor control is also lack of the inertia block and speed controller block, resulting in poor dynamic performance, steady-state performance, and low accuracy of the power sharing of the AC microgrid. In this study, a novel VSG control strategy incorporating improved governor control and coupling compensation is proposed to improve the performance of the AC microgrid. Its improved governor control comprises the speed controller and inertia, which can enhance the inertia of the angular frequency and decrease the difference of the governor control between the novel VSG control strategy and diesel generator. Its coupling compensation comprises the angular frequency deviation compensation and voltage deviation compensation, which can reduce the influence of the uncontrollable coupling on the power regulation and increase the degree of freedom of the power regulation. Experimental results validate the effectiveness of the proposed VSG control strategy.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Current closed-loop control and field orientation analysis of an induction
           motor in six-step operation for railway applications
    • Authors: Xiaochun Fang;Zhongbei Tian;Hua Li;Zhongping Yang;Fei Lin;Stuart Hillmansen;
      Pages: 1462 - 1469
      Abstract: In railway traction drive systems, six-step operation is widely used for motors in a flux-weakening region. Traditional vector control algorithms in six-step operation cannot work effectively due to the limitation of a single degree of freedom. This study analyses the dq current coupling relationship when the voltage amplitude is limited and applies a current closed-loop control strategy in six-step operation. This study proposes a proper switching control strategy to achieve a dual-mode control for induction motors in a full-speed region. The accuracy of field orientation is affected by changes in motor parameters and plays a key role in current control precision. This study analyses the effect of field orientation error on motor six-step operation. It is found that the proposed current closed-loop control strategy can correct the field orientation error and guarantee the motor current to track the reference precisely. A case study of a 5.5 kW experimental platform is presented to validate the control schemes.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • State-of-charge estimation of lithium-ion batteries using composite
           multi-dimensional features and a neural network
    • Authors: Jianhua Li;Mingsheng Liu;
      Pages: 1470 - 1478
      Abstract: A novel method that uses composite multi-dimensional features data to estimate the state of charge (SOC) of a battery is presented to address the shortcomings of using single-dimensional feature data. Two types of data, the terminal voltage and the terminal current, which can be obtained directly by measuring, are selected as low-dimensional feature data. The open-circuit voltage (OCV), as high-dimensional feature data, cannot be directly measured, and can be used to estimate the SOC by the OCV-SOC method. Thus, in this study, the second-order RC equivalent model of a battery is used and the OCV is identified online by the forgetting factor recursive least-squares algorithm. The proposed method is implemented by first using a feed-forward neural network, followed by a time-series neural network. The dynamic stress test and urban dynamometer driving schedule discharging profiles are applied to train and test the two neural networks. The experimental results show that the proposed method can estimate the SOC more accurately than neural networks using only single-dimensional feature data. Moreover, the time series neural network can overcome the shortcomings of traditional estimation methods.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Adaptive control technique for suppression of resonance in grid-connected
           PV inverters
    • Authors: Hongsoo Goh;Matthew Armstrong;Bashar Zahawi;
      Pages: 1479 - 1486
      Abstract: Grid operating conditions have a significant effect on the harmonic and resonant performance of grid-connected photovoltaic (PV) inverters and changes in grid impedance can cause a notable change in the resonant excitation between the PV inverter and the grid. This study proposes an adaptive control algorithm for grid-connected PV inverters to suppress the resonance condition excited by grid inductance variation, resulting from the dynamic changes in the operating conditions of the distribution network. The causes of resonance between grid-connected PV inverters and the distribution grid are discussed and the design of an active band-pass filter for capturing resonance is described. The proportional gain within the proportional-integral controller is then adaptively controlled in real time to compensate for changes in the grid impedance and suppress resonant excitation while maintaining excellent low-order harmonic performance compared with alternative fixed gain controller techniques, particularly for systems with high values of grid inductance. The performance of the proposed controller is experimentally verified using a 240 V, 2 kVA single-phase grid-connected inverter.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Family of transformerless pulse-width modulation converters integrating
           voltage equalisers for PV panels and energy storage modules
    • Authors: Masatoshi Uno;Masaya Yamamoto;
      Pages: 1487 - 1498
      Abstract: In photovoltaic (PV) systems, partial shading on PV panels is known to decrease the energy yield significantly. In energy storage applications, voltage imbalance of series-connected energy storage devices may result in over-charging and over-discharging of some devices. Although these issues can be precluded by voltage equalisers, PV and energy storage systems are prone to complexity because, in addition to main converters, voltage equalisers are separately necessary. To simplify the PV and energy storage systems, four kinds of transformerless pulse-width modulation converters integrating voltage equalisers are proposed in this study. Four kinds of basic circuits, each containing a unique `switching cell', are introduced as a foundation of integrated converters. Stacking multiple switching cells with respective basic circuit derives the proposed integrated converters. Fundamental operation analyses are performed for two representative topologies. Experimental verification tests were performed using prototypes for a PV panel and series-connected electric double-layer capacitors (EDLCs). With the integrated converters, the energy yield from the partially shaded PV panel was significantly increased, and EDLCs were charged with eliminating voltage imbalance. This study chiefly focuses on the generalisation, fundamental operation analysis, and experimental verification for the proposed circuit derivation concept rather than detailed analysis for individual topologies.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Systematic approach to construct and assess power electronic conversion
           architectures using graph theory and its application in a fuel cell system
    • Authors: Wenping Zhang;
      Pages: 1499 - 1509
      Abstract: With the proliferation of renewable energy generations, power conversion systems (PCSs) are becoming much more complex; it is becoming challenging to search all possible power conversion architectures (PCAs) and find the best optimisation in terms of different objectives. Therefore, this study investigates a systematic approach to construct and evaluate PCAs using graph theory. First, the components in PCSs are graphically modelled as either nodes or edges. Then, a generalised PCA deduction methodology is proposed, and all possible PCAs can be mathematically deduced by modifying elements in adjacency matrices. For a fuel cell (FC) generation system, 45 possible PCAs are found with the proposed method. Furthermore, an evaluation methodology based on graph theory is proposed. The performance indices of the deduced PCAs, including costs, efficiency, and reliability, are calculated. Then, an optimisation approach is applied to finding the best architecture compromise, where the one with the shortest distance to the ideal architecture is considered the best architecture compromise. For the FC demo system, with the proposed assessment methodology, the best architecture compromise (dc-bus structure) is found among 45 possible architectures. Finally, the experimental platform, which adopts the dc-bus optimised architecture, is built and experimental results validate the architecture selection.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Non-isolated interleaved bidirectional DC–DC converter with high step
           voltage ratio and minimum number of switches
    • Authors: Mahdi Shaneh;Mehdi Niroomand;Ehsan Adib;
      Pages: 1510 - 1520
      Abstract: In this study, a new non-isolated interleaved bidirectional DC-DC converter with a high step voltage ratio based on coupled inductors (CIs) is introduced. The CIs significantly increase the voltage conversion ratio and provide soft-switching conditions for the switches at turn-on instant. Also, employing an interleaved structure combined with the CI in the low-voltage side noticeably reduces the current ripple and this feature has a vital role in the high-power applications. Also, this topology provides auto-current sharing for the two phases of the interleaved structure. The CIs in the high-voltage side, supply a steep gain in both buck and boost modes with an appropriate duty cycle. The proposed method provides zero current switching (ZCS) turn-off condition for all diodes and ZCS turn-on condition for all switches without requiring any auxiliary circuit. So the undesirable reverse recovery effects of diodes are considerably reduced. The proposed converter has the minimum number of switches for two-phase bidirectional structures. Also, a simple passive clamp circuit is proposed for the converter to limit the voltage spikes of CIs. Finally, a 600 W, 30/300 V laboratory prototype is implemented to verify the performance.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Multiloop current control for an
           inductive–capacitive–inductive-filtered grid-connected inverter with
           frequency-adaptive capability under distorted grid environment
    • Authors: Seung-Jin Yoon;Kyeong-Hwa Kim;
      Pages: 1521 - 1531
      Abstract: To eliminate the adverse effects of grid voltages such as the harmonic distortion and frequency variation, this study presents a multiloop current control scheme for an inductive-capacitive-inductive-filtered grid-connected inverter. The proposed scheme is achieved by multiloop control structure which is composed of the grid-side current control loop, capacitor voltage control loop, and inverter-side current control loop. This structure has an advantage of seamless mode transfer between the grid-connected mode and islanding mode. In addition, the proposed scheme offers a frequency adaptation capability even under distorted grid environment, providing a high quality of injected current in grid-connected mode. Whereas the conventional schemes require lots of state measurements, the proposed scheme eliminates the need of additional sensing devices by employing a discrete-time state observer. The resonant controllers are implemented in outer grid-side current controller to deal with harmonically distorted grid voltage at the 5th, 7th, 11th, and 13th orders. The proposed scheme ensures the quality of grid currents even in the presence of both the harmonic distortion and frequency change in grid voltages by using only the measurement of the grid-side currents and grid voltages. Simulation and experimental results are given to validate the usefulness of the proposed scheme.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Enhanced high-gain SLC-ZSI at low-duty region
    • Authors: Vinod Kumar Bussa;Rajeev Kumar Singh;Ranjit Mahanty;
      Pages: 1532 - 1544
      Abstract: An enhanced high-gain switched inductor capacitor (LC) Z-source inverter (eSLC-ZSI) is proposed in this study. It has a lesser number of elements to achieve high-gain inversion at low-duty region as compared with the conventional non-isolated high-gain ZSIs. It gives continuous input current at reduced high-frequency ripple, which is essential for the sources such as solar photovoltaic cells, fuel cells and batteries to enhance their lifetime. Owing to its operation at low-duty region (i.e. increased modulation index), it gives high-gain inversion at low harmonic distortion. A detailed mathematical modelling of the proposed enhanced SLC-ZSI is carried out using the developed switching logic. In addition, a comparative analysis is given among the reported ZSIs and the proposed ZSI in terms of number of elements, boosting capability, voltage gain, the volume of the passive elements, voltage and current stresses on the elements. The steady-state behaviour of the proposed ZSI is verified through PSIM-based simulation studies and scaled down 250 W laboratory prototype. Using the experimental results, power losses in different elements of the proposed ZSI are calculated at rated power and its efficiency is measured at different loading conditions.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Grid connection technique based on μ theory for a
           two-stage PV structure
    • Authors: Xueqian Fu;Qiang Fu;Wanwei Tang;
      Pages: 1545 - 1553
      Abstract: There is greater flexibility in selecting the direct-current (DC) bus voltage in a two-stage photovoltaic (PV) grid-connected structure than in a single-stage one. The independent DC/DC and DC/alternating current (AC) control in traditional control methods changes the duty cycle of the first-stage DC/DC, which affects the control of the secondary DC/AC and even stabilises the DC bus voltage between the two stages. Therefore, two-stage converters should be considered and controlled in a unified manner. Here, the authors introduce a robust μ value control method based on the hybrid sensitivity theory to control a two-stage PV power generation system. Considering the effect of parameter perturbation on the modelling of the DC/DC average state model, the proposed method improves the DC bus voltage stability of a PV system and the power quality of the grid-connected current while achieving the maximum power point tracking performance of the PV. MATLAB simulations using three PV operating conditions demonstrate that the proposed control method can effectively reduce the fluctuation of the DC bus voltage between the two stages, the harmonic distortion rate of the grid-connected current, and the power oscillation time when the working conditions change.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Adaptive speed estimation with fuzzy logic control for PV-grid interactive
           induction motor drive-based water pumping
    • Authors: Saurabh Shukla;Bhim Singh;
      Pages: 1554 - 1562
      Abstract: This paper proposes a fuzzy logic control for model reference adaptive system (MRAS)-based speed adaptation technique of an induction motor drive (IMD) used for the bidirectional power flow between a photovoltaic (PV) array and a single-phase utility grid on the same DC link for water pumping. This system comprises of one current sensor and one voltage sensor for sensing grid quantities and one current sensor and one voltage sensor for sensing the DC link current and its voltage. The DC link current is used to estimate three-phase motor winding currents. Phase current is reconstructed from DC link current through a space vector modulation technique. The mechanical sensorless control of the proposed system is achieved by stator voltage and current-based speed adaptation. The direct torque control (DTC) is used for an IMD. The generalised integrator-based fundamental voltage generation algorithm is proposed for power flow control between the single-phase utility grid and DC link voltage feeding an induction motor-driven water pump. The developed prototype is tested in the laboratory and its suitability is judged through various results under different conditions of insolation variations.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Segmental switching strategy with zero output pulsation for dynamic EV
           wireless charging system
    • Authors: Qingwei Zhu;Yanjie Guo;Shufan Li;Lifang Wang;Chenglin Liao;
      Pages: 1563 - 1570
      Abstract: In practical dynamic electric vehicle (EV) wireless charging applications, the charging roadway is segmented and the segments are switched on and off along with the passing-by EVs, which often causes output power pulsations. Here, the decoupling characteristics of two general inductively coupled coils are investigated. Based on which, an easy-implement switching strategy to minimise the output power pulsation in the repeatedly occurring segmental switches is proposed. Each segment is to be switched on when a coming EV passes the entry-end decoupling point of that segment, and to be cut-off when the vehicle passes the other decoupling point as it leaves from the other end. Practical issues regarding to the coil dimensions have also been studied to investigate the compatibility of the proposed method. Dynamic charging and segmental switching experiments on a predesigned 2.5 kW dynamic wireless charging prototype were conducted to testify the proposed method. Smooth transition with zero output power pulsation and noticeable improvement on the systematic efficiency over the transition zone were achieved.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • New topology of a switched-capacitor-based multilevel inverter with a
           single DC power supply
    • Authors: Asghar Taheri;Hosein Samsami;
      Pages: 1571 - 1584
      Abstract: The utilisation and importance of multilevel inverters, as one of the key component of new electrical systems, are ever-increasing. As a result, many works and evolutions have been carried out, which lead to improvements of topologies and control strategies. Newly introduced topologies can generate output voltage with maximum level number, minimum switching components and power supplies. This study introduces a multilevel inverter with minimum number of DC power supply and optimum number of semiconductors based on the switched-capacitor method. One of the best features of the proposed topology is its voltage generation with boost capability without any need for H-bridge. Moreover, the proposed topology has modular extension capability in order to increase the number of output levels. The comparison between the proposed converter and some previous topologies shows that it has better conditions with respect to the used semiconductor count, switches and capacitors losses. The operation and performance of the proposed multilevel converter have been ascertained through simulations and verified experimentally for a single-phase 17-level inverter. All results are illustrated to show the proposed converter's ability in smooth sinusoidal output voltage generation with boosting the input voltage without any transformer.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Single-stage impedance source inverters with quasi-DC–DC output cell for
           working in dual inductor current modes
    • Authors: Hongchen Liu;Yuliang Ji;Feng Yong;Fengjiang Wu;Pat Wheeler;
      Pages: 1585 - 1592
      Abstract: Single-stage impedance source inverters with quasi-DC-DC output cell (QDDOC) are proposed here. The QDDOC is derived from DC-DC converters, and QDDOC can be applied in all the existing impedance source inverters. Compared to the traditional impedance source inverters without QDDOC, the proposed inverters with QDDOC can adapt to the wider inductor parameter range and flexibly work into dual inductor current states: continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Also, the proposed inverters can retain the single-stage voltage-boost performance, and solve the DC-link voltage drop produced by DCM. Under DCM, the proposed inverters improve the boost ability, lower the inductor values, size and weight, and reduce the voltage stresses across passive components. The circuit topologies, modulation strategies, and operating principles are analysed in detail. Finally, experiment results verify the validity of proposed topologies.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
  • Single stationary domain equivalent inverter admittance for three-phase
           grid-inverter system considering the interaction between grid and inverter
    • Authors: Xiaoming Zou;Xiong Du;Guoning Wang;Heng-Ming Tai;
      Pages: 1593 - 1602
      Abstract: Admittance matrix has been used to represent the characteristics of three-phase inverter for grid-inverter system stability evaluation in both stationary, sequence, and dq domain. For the dq domain admittance matrix, the PLL and Park transformation introduce additional dynamics during the admittance measurement that may influence the application of dq model. For the stationary and sequence domain admittance matrix, the model measurement is not affected by the above additional parts but may also encounter other difficulties in actual measurement. First, current frequency response analyser (FRA) is not able to perform two-frequency measurement required by the admittance matrix. Second, practical limitations exist in the course of solving complex-valued admittance matrix equations. Here, a single stationary domain equivalent admittance of three-phase inverter for grid-inverter system with considering the interaction between grid and inverter is defined so that the above two difficulties can be avoided. Then, an equivalent admittance model of prototype inverter is constructed for stability analysis of the grid-inverter system using Nyquist stability criterion, instead of the generalised Nyquist criterion (GNC). The effectiveness of the proposed equivalent inverter admittance model is validated through simulation and experiment verification.
      PubDate: 5 29 2019
      Issue No: Vol. 12, No. 6 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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