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  Subjects -> ELECTRONICS (Total: 207 journals)
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Journal of Power Electronics
Number of Followers: 6  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1598-2092 - ISSN (Online) 2093-4718
Published by Springer-Verlag Homepage  [2467 journals]
  • Improved SVPWM modulation method for three-phase dual-input dual-buck
           inverters

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      Abstract: Abstract The traditional modulation method for three-phase dual-input dual-buck inverters is level-shifted sine pulse width modulation. The disadvantage of this method is that the dc voltage utilization ratio is low and the software fault tolerance is difficult to realize. To solve these problems, an improved SVPWM suitable for this inverter is proposed in this paper. By analyzing the switch modes and bridge arm midpoint level of this inverter, 27 voltage vectors are obtained. According to the obtained long vector cluster, medium vector cluster, and short vector cluster, six modulation sectors are obtained, and each modulation sector has four modulation regions. When the voltage of the inverter low-voltage dc source changes, the associated vector changes as well. How the modulation region changes when the associated vector changes is analyzed. The action time of each vector in each modulation region is deduced. In addition, the action order of each vector involved in vector synthesis is optimized. A 2 kW prototype was built to carry out experimental research. Experimental results show that this modulation method improves the dc voltage utilization ratio, reduces the loss, and improves the efficiency of the inverter.
      PubDate: 2022-12-02
       
  • Quadratic-type high step-up DC–DC converter with continuous input
           current integrating coupled inductor and voltage multiplier for renewable
           energy applications

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      Abstract: Abstract This paper presents a quadratic-type high step-up DC–DC converter for renewable energy applications with a continuous input current. To reduce the number of components while increasing the gain, a quadratic boost converter and two multiplier cells are applied as the primary and secondary circuit with one coupled inductor connected. In addition, the clamp circuit shares its components with both the second boost stage and the voltage multiplier, which increases the power density. As a result, the leakage energy is recycled and the voltage stress can be suppressed. The operation principles and steady-state analyses including loss analysis of the proposed converter are addressed in detail. Compared with relevant existing topologies of quadratic converter, the proposed converter performs a higher voltage gain and a lower power switch stress. To validate the performance, a 200 W experimental prototype is constructed and tested with 20 V of input voltage and 400 V of output voltage, where the highest efficiency is 95.2% and the full-load efficiency is 93.7%. The performance under dynamic conditions is also verified. In the end, an improved topology based on the proposed converter is supplemented.
      PubDate: 2022-12-02
       
  • Lifetime-based fault tolerant strategy for three-level hybrid ANPC
           inverters

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      Abstract: Abstract This paper presents a fault tolerant control that aims at improving the reliability of three-level hybrid ANPC inverters. Since the hybrid ANPC inverter consists of Si devices and SiC devices have a higher output quality and lower power losses, it has been considered in various power conversion industries. However, there still are concerns over its reliability since employing many power devices increased the risk of failure. Furthermore, the inverter is composed of a switching device and a DC-link capacitor, which mainly determine the reliability of the system. As one of the strategies to improve reliability, fault tolerant control methods have been intensively studied. However, applying the fault tolerant control increases the power losses of the switching device or the DC-link capacitor, which leads to earlier second failures. This paper proposes a lifetime-based fault tolerant strategy considering the remaining useful lifetime of the power device and DC-link capacitor, which increases the lifetime of the whole system. The validity and effectiveness of the proposed fault tolerant control method are verified through simulation and experimental results.
      PubDate: 2022-12-01
       
  • Capacitor-assisted active-switched quasi-Z-source inverters with high
           voltage gain

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      Abstract: Abstract This paper presents a novel topology called the capacitor-assisted active-switched quasi Z-source inverter (CA/AS-qZSI). The proposed CA/AS-qZSI topology has a high ac voltage gain and low voltage and current stresses on the diodes and extra switch in the Z-network. The design guide of the passive elements used in the proposed topology and a comparative study of the proposed CA/AS-qZSI and four other topologies with an active-switched impedance network are addressed. A new pulse-width modulation (PWM) technique using a sawtooth carrier signal is also suggested to reduce the switching losses of the diodes and switches. Compared with the traditional simple boost control method, the efficiency of CA/AS-qZSI using the new PWM technique is improved by 4–4.6%. The experimental results utilizing a prototype made in the laboratory demonstrate the performance of the proposed CA/AS-qZSI and PWM technique.
      PubDate: 2022-12-01
       
  • Prognostics of capacitors for power converters based on data augmentation
           and IPSO-GRU

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      Abstract: Abstract Aluminum electrolytic capacitors (AECs) play a crucial role in traction power electronic converters, which are also the most likely to be responsible for breakdowns. Fault prediction for AECs is helpful to realize preventive maintenance and to reduce the cost of the entire system. However, it is restricted by the collected data scale and the period of the deteriorative process of AECs. Thus, this paper takes the advantages of the synthetic minority oversampling technique (SMOTE) that is used to augment the degradation data information and the gate recurrent unit (GRU) that can be suitable for degradation samples to establish a prediction model. An improved particle swarm optimization (IPSO) algorithm is utilized to optimize the hyper parameters of the GRU to promote the feature learning and prediction performance. Thereupon, a prognostics model based on data augmentation and a GRU optimized by IPSO is simulated on a degradation dataset of AECs under an aging test. The results show that the integrated prediction model achieves better accuracy and reliability when compared to some traditional models. Furthermore, the relative error of each prediction point is less than 2.5% for single step and 3.0% for multi-step, respectively.
      PubDate: 2022-12-01
       
  • Expansion of reconstruction areas for current measurement using three
           shunt resistors in three leg two-phase inverters

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      Abstract: Abstract When driving two-phase motors using three leg inverters, phase currents can be measured using shunt resistors inserted between a low-side switch on each leg of the inverter and the negative DC-link terminal. The current measuring scheme using shunt resistors on only two inverter legs has a limited current measurement capability. In addition to this two shunt scheme, the three shunt scheme can reconstruct immeasurable currents utilizing a shunt resistor located on a neutral leg of the inverter. Thus, the three shunt scheme can widen the areas where the currents can be measured when compared to those in the two shunt scheme. However, this scheme cannot appropriately reconstruct currents within operating areas where a sufficient turn-on time for the low-side switches cannot be guaranteed, which results in increased torque ripple of two-phase motors and decreased DC voltage utilization of inverters. In this paper, a simple technique for expanding the reconstruction areas of the currents in the three shunt scheme is proposed. The proposed technique can expand the reconstruction areas by utilizing DPWM (discontinuous pulse width modulation) that can secure the turn-on time of the low-side switches longer than CPWM (continuous PWM), thereby improving the DC voltage utilization.
      PubDate: 2022-12-01
       
  • Novel adaptive power management strategy for hybrid AC/DC microgrids with
           hybrid energy storage systems

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      Abstract: Abstract This paper presents an adaptive power management strategy (PMS) that enhances the performance of a hybrid AC/DC microgrid (HMG) with an interlinking converter (IC) integrated with a hybrid energy storage system (HESS). The HESS is made up of a supercapacitor (SC), a battery, and a fuel cell (FC) with complementary characteristics. The modeling of the test system, which consists of an IC control structure with virtual synchronous machine-transient (VSM-T) droop and HESS control, is outlined in this article. The modified IC topology improves the power-sharing between sub-grids and enhances the steady-state and transient responses. The novelty of the proposed strategy is that the power ratio index-based power management approach is executed through a single controller using local measurements. Furthermore, the adaptive nature of the reference generation improves the active and reactive power-sharing of the IC and the simultaneous voltage regulation at AC and DC sub-grids. The performance of a HMG under varying loading and irradiation, distributed generation (DG) outage, and electric vehicle charging station (EVCS) charging are analyzed on a modified IEEE 13-bus HMG test system and validated using OPAL-RT real-time hardware-in-the-loop (HIL) experiments. Furthermore, the adaptive nature of reference generation in the proposed approach improves power-sharing during both volatile and normal loading. The proposed PMS provides a voltage improvement of 7.92% at the AC sub-grid, and 0.42% at the DC sub-grid of the HMG.
      PubDate: 2022-12-01
       
  • Analysis and improvement of output power drop of dynamic wireless power
           transfer systems with transmitting coil switching for inspection robots

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      Abstract: Abstract Dynamic wireless power transfer (DWPT) has received extensive attention due to its advantages of high security, high convenience, and high efficiency. To solve the problems of the mutual inductance and output power drop of DWPT systems for inspection robots, a new DWPT system with a trapezoidal-rectangular coupler has been proposed. First, the DWPT system topology and the switching strategy of the transmitting coil are introduced. Second, the real-time mutual inductances of the coupler in linear and curved motion are derived. Third, a new trapezoidal transmitting coil is presented. Finally, the performance of the DWPT system with the trapezoidal-rectangular coupler (TRC) is tested and compared to the DWPT system with the rectangular-rectangular coupler (RRC). Experimental results show that the minimum mutual inductance of the TRC is increased by 58.71%, and that the minimum output power is more than doubled in curved motion. Moreover, the mutual inductance drop rates of the TRC in linear and curved motion are reduced by 21.23% and 18.42%, respectively. The output power drop rates of the TRC-DWPT system are reduced by 18.99% and 16.12%, respectively. In addition, the Litz wire consumption is reduced by 8.28% in linear motion.
      PubDate: 2022-12-01
       
  • Design of a misalignment-tolerant wireless charging system based on
           multidimensional cross-coupling for autonomous underwater vehicles

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      Abstract: Abstract In this paper, a misalignment-tolerant wireless charging system based on multidimensional cross-coupling for autonomous underwater vehicles (AUVs) is proposed. The four transmitting coils of the proposed system magnetic coupler are divided evenly into two pairs as bipolar transmitting units. Subsequently, the uniform multi-dimensional horizontal magnetic flux can be obtained by two current vectors with a 90° phase difference exciting in the bipolar transmitting units. For the receiver, a couple of orthogonal coils are designed to form cross-coupling with the transmitter to pick up the maximum magnetic flux. Then, the proposed magnetic coupler combined with the proposed transmitter and receiver is designed through finite element analysis. Finally, a 900 W prototype is built and tested. Experimental results show that the system has stable output characteristics in the ranges of a − 20° to 20° rolling misalignment and a − 30 to 30 mm axial misalignment.
      PubDate: 2022-12-01
       
  • Condition monitoring of inverter power devices based on electromagnetic
           acoustic emissions

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      Abstract: Abstract Unlike conventional voltage and current sensing, this paper studies the use of acoustic emission signals to detect the condition of the power device for a DC–AC inverter. As a relatively new method for monitoring power devices, there are some unknown phenomena in acoustic emissions (also called mechanical stress wave). Therefore, the authors present an experimental setup that is used to analyze acoustic emission signals. Based on experimental results, some interesting points have been found: (1) The generation of a mechanical stress wave is verified for the first time. (2) The time-domain peak value, energy, and rise time of the mechanical stress wave at the turn-on time of a power device are barely affected by the load. Meanwhile, these values decrease with an increase of the load at the turn-off time. (3) The frequency-domain peak value of the mechanical stress wave tends to decrease with an increase of the load, and the peak frequency is barely affected by the load. These mechanical stress analysis results can be utilized for condition monitoring in many applications.
      PubDate: 2022-12-01
       
  • Dual input step-up inverter with low leakage current for PV generation
           applications

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      Abstract: Abstract The non-isolated inverter has been widely used in photovoltaic generation applications due to its low cost, reduced size, low weight, and high efficiency. However, when there is no galvanic isolation between the photovoltaic (PV) plant and the grid, leakage current may be generated due to the parasitic capacitor to the ground of the photovoltaic (PV) plant, which brings electromagnetic interference (EMI) and security problems. The main idea of this article is to construct a step-up voltage source inverter with two low-voltage input sources. The proposed inverter integrates a step-up dc–dc converter and a modified step-up dc–dc converter that has the advantages of a simple structure and strong voltage boosting capability. Moreover, the negative polarity of a solar cell and the neutral point of a power grid are linked together, which can greatly reduce the leakage current and improve the reliability and efficiency of the PV system. The operating principle, modulation strategy, and static behavior of the proposed inverter are described in detail. To verify the effectiveness of the proposed structure, a 250w laboratory test setup is established, and test results have been shown.
      PubDate: 2022-12-01
       
  • Artificial neural network-based FCS-MPC for three-level inverters

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      Abstract: Abstract Finite control set model predictive control (FCS-MPC) stands out for fast dynamics and easy inclusion of multiple nonlinear control objectives. However, for long horizontal prediction or complex topologies with multiple levels and phases, the required computation burden surges exponentially as the increases of candidate switch states during one control period. This phenomenon leads to longer sample period to guarantee enough time for traverse progress of cost function minimization. In other words, the allowed highest switching frequency is bounded considerably far from the physical limits, especially for wide-band semiconductor applications. To overcome this issue, the parallel computing characteristic of artificial neural network (ANN) motivates the idea of an ANN-based FCS-MPC imitator (ANN-MPC). In this article, ANN-MPC is implemented on a neutral point clamped (NPC) converter using a shallow neural network. The expert (FCS-MPC) is initially designed, and the basic structure, including activation function selection, training data generation, and offline training progress, and online operation of the imitator (ANN-MPC) are then discussed. After the design of the expert and imitator, a comparative analysis is conducted by field programmable gate array (FPGA) in-the-loop implementation in MATLAB/Simulink environment. The verification results of ANN-MPC show highly similarly qualified control performance and considerably reduced computation resource requirement.
      PubDate: 2022-12-01
       
  • Remaining useful life prediction for lithium-ion battery using dynamic
           fractional brownian motion degradation model with long-term dependence

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      Abstract: Abstract The remaining useful life (RUL) prognostic of lithium-ion batteries (LIBs) is important in the reliability of electric vehicles. The degradation state of LIBs is related to the current moment and historical data, which is a non-Markovian process with long-term dependence. This manuscript proposes a RUL prognostic approach based on a non-Markovian process, which uses a fractional Brownian motion (FBM) model. Firstly, a nonlinear FBM model is established to describe the battery non-Markovian capacity fading process. The drift parameter of the FBM model and degradation states are updated by an online Kalman filter when a new measurement value arrives. Then the maximum likelihood estimation approach is introduced to obtain the other undecided fixed parameters. This approach is based on off-line battery degradation historical data. According to the first hitting time, the probability distribution function is derived to quantify the uncertainty of the RUL prognostic results. Finally, two datasets are used to verify the effectiveness of the proposed method. For the NASA dataset battery #5, the relative errors of the RUL prediction results of the proposed method are 2.941 and 2.083 when the starting points of the predictions are 60 cycles and 80 cycles, respectively. Thus, the proposed method is superior to other methods.
      PubDate: 2022-12-01
       
  • SOC balance-based decentralized control strategy for hybrid energy storage
           in integrated power systems

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      Abstract: Abstract The hybrid energy storage systems (HESSs) in vessel integrated power systems can support pulse load and improve system stability. However, the unbalanced SOC of different energy storage devices can cause over-charge and over-discharge which damages the energy storage devices and affects the stable operation of the entire system, especially when there are multiple groups of HESSs. Therefore, a decentralized control strategy for the HESSs in integrated power systems (IPSs) based on extended droop control combined with SOC balance control is proposed in this paper. In the proposed strategy, SOC recovery control is introduced to the virtual capacitance droop coefficient of the supercapacitor, and SOC equalization control is introduced to the virtual resistance droop coefficient of the lithium battery to adjust the output characteristics of the HESS according to the SOC. Then the frequency response characteristics are analyzed and the stability of the system is calculated. Finally, the hardware in loop simulation is conducted to verify the effectiveness of the proposed strategy. Comparisons show that the proposed strategy can compensate for the pulse load according to the responding characteristics of the HESS and achieve SOC balance between different energy storage devices under various working conditions.
      PubDate: 2022-12-01
       
  • Multi-objective optimization algorithm for optimizing NVH performance of
           electric vehicle permanent agnet synchronous motors

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      Abstract: Abstract The NVH (noise, vibration, harshness) performance of a motor is one of the main problems affecting the comfort, safety, and reliability of electric vehicles. Electromagnetic force is the main cause of motor noise. Most of the existing research focuses on the overall noise level, and does not consider the impact of specific orders of electromagnetic force on noise, which results in a lack of applicability of noise reduction techniques. In this paper, a rotor with an auxiliary slot was used to weaken the electromagnetic force. A multi-objective optimization algorithm combining finite-element simulation with a response surface method was proposed. To determine the relationship between specific orders of electromagnetic force and the auxiliary slot parameters, simulation experiments were carried out with a large range and a large step size in finite-element analysis software. Then, the parameter range with a low value of electromagnetic force was selected. In this new range, the response surface method was used to establish the parameter and electromagnetic force expressions. Then, the linear weighting method in the multi-objective optimization algorithm was selected to determine the objective function of the multi-order electromagnetic force optimization. The weight of each order of electromagnetic force was set according to its contribution to the noise. Finally, the effectiveness of the proposed method was verified by simulations. Simulation results show that this method can quickly and effectively determine the optimal size of the auxiliary slot. In addition, the maximum value of the noise was reduced from 107.6 to 103.2 dB.
      PubDate: 2022-12-01
       
  • Online cell-by-cell SOC/SOH estimation method for battery module employing
           extended Kalman filter algorithm with aging effect consideration

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      Abstract: Abstract As the number of series connections of battery cells increases, individual cells are operating in different temperature profiles, and the aging patterns of the cells become dissimilar from each other. Thenceforth, individual state-cell-characteristics should be tracked online for higher safety. Although Kalman-filter-based battery state estimation is one of the most popular methods, it is sensitive to the accuracy of the battery model parameters and difficult to be applied to every cell. This work proposes an online cell-by-cell state-of-charge (SOC)/state-of-health (SOH) estimation method to mitigate this limitation. The aging patterns of the individual cells are predicted by introducing a combination of a switch-matrix flying capacitor and electrochemical impedance spectroscopy (EIS) model parameter scanning techniques. Accordingly, the accuracy of the SOC estimation for individual cells is enhanced. The proposed method is verified by a real-time simulation platform, where the SOC and SOH levels of the cells are individually estimated within a 1.24% error.
      PubDate: 2022-12-01
       
  • Analysis of a coupled inductor boost three-port converter with high
           voltage gain for renewable energy systems

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      Abstract: Abstract A conventional boost three-port converter is combined with a coupled-inductor-based boost-flyback converter in this work to produce a high-step-up three-port converter. The proposed converter inherits the benefits of two conventional converters, including high voltage gain, few elements, and energy recycling of the leakage inductor. In addition, the voltage stresses of switches are considerably lower than the output voltage. Therefore, switches with low ON resistance can be selected to reduce the conduction loss. Additionally, the freewheel diodes are capable of zero-current switching. The operation principle can be divided into three modes of operation, and the three steady-state operation modes are analyzed under each of the three conduction modes. The operation principles of various modes, the voltage characteristics, the boundary of the coupled inductor, and the proposed converter’s control method are discussed in depth to provide detailed theoretical guidance to designers. Then, the simulation and experiment results of a laboratory prototype with an 18 V PV source, 24 V battery pack, and 180 V output are presented to validate the feasibility of the theoretical analysis.
      PubDate: 2022-12-01
       
  • Negative sequence control for DC voltage balancing in three-phase cascaded
           H-bridge rectifiers considering DC-port failures

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      Abstract: Abstract As a vital component of power electronic transformers (PET), the reliability of a cascaded H-bridge rectifier (CHBR) is essential. Therefore, in this paper, a DC-port voltage balance strategy considering DC-port failure is researched to ensure the stable operation of a CHBR. However, if the DC-port voltage balance strategy is adopted to realize the single-phase balance of a CHBR, the three-phase currents become unbalanced. This paper uses a negative sequence control (NSC) strategy that is conducive to balancing DC-port voltage to achieve three-phase current balance. For the DC-port voltage balance, the matrix generation modulation (MGM) algorithm is proposed. In addition, the DC-port voltage balance boundary is analyzed to determine the range of the DC-port voltage balance in the CHBR. A 3-module cascading topology is adopted to demonstrate the MGM algorithm and the NSC strategy. Through experiments, results show the correctness and feasibility of the proposed strategy.
      PubDate: 2022-12-01
       
  • Correction method for calculating junction temperature considering
           parasitic effects in SiC MOSFETs

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      Abstract: Abstract The turn-on change rate of drain current diDS(on)/dt is an electrical parameter that is suitable for the online monitoring of junction temperature in SiC MOSFETs. In practical applications, the change of an external circuit changes the temperature-sensitive characteristic of diDS(on)/dt. In this paper, a SiC MOSFET in a Buck converter is taken as the research object. First, it is theoretically derived and experimentally verified that the power loop inductance and drive loop resistance are parasitic parameters that affect the temperature-sensitive characteristic of diDS(on)/dt. Second, according to the spectrum peak characteristics caused by the drain–source turn-off oscillation voltage of the SiC MOSFET, the theoretical relationship between the diDS(on)/dt temperature-sensitive characteristic and the peak of the drain–source turn-off oscillation voltage is studied. It is concluded that the spectrum peak can reflect the change of the diDS(on)/dt temperature-sensitive characteristic caused by the change of the parasitic parameters. Based on the above research, a model of a modified diDS(on)/dt temperature-sensitive characteristic considering parasitic effect is established in this paper. Through experimental verification, this model can largely eliminate the junction temperature monitoring error caused by the change of the external circuit.
      PubDate: 2022-11-30
       
  • Novel high-power triple line-voltage cascaded unity power factor rectifier

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      Abstract: Abstract A novel high-power triple line-voltage cascaded three-phase unity power factor rectifier is proposed to address the complex topology and control of the three-phase rectifier stage in traditional high-power charging power supply modules. The topology is composed of three line-voltage cascaded traditional three-phase single-switch boost-type voltage rectifier modules. With the triple line-voltage cascaded structure, in the proposed topology, the number of the fully controlled power switches and the voltage stresses of each power switch are both effectively reduced. In addition, the proposed rectifier topology can operate at a unity power factor with a sinusoidal input current. In this paper, the circuit structure and the operation principle including the DC-link voltages output characteristics of the proposed topology are described, and a corresponding system control strategy based on one cycle control (OCC) is presented. Simulation and experimental results are given which verified the feasibility of the proposed topology and control strategy.
      PubDate: 2022-11-30
       
 
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