<![CDATA[ IEEE Transactions on Power Electronics - new TOC ]]>
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TOC Alert for Publication# 63 2022August 11<![CDATA[Table of Contents]]>3711C112931117<![CDATA[IEEE Power Electronics Society]]>3711C2C231<![CDATA[A Parallel-Connected 24-Pulse Rectifier Using Hybrid Harmonic Reduction Method at DC Side]]>371112932129372255<![CDATA[Cybersecurity in Power Electronics Using Minimal Data – A Physics-Informed Spline Learning Approach]]>371112938129434292<![CDATA[Continuously Adjustable Modular Bidirectional Switched-Capacitor DC–DC Converter]]>371112944129483301<![CDATA[Unified Viewpoint of Soft Startup and Rate Limiter for SOGI-FLL]]>a priori information of transient input. When a fair parameter is tuned, the soft startup and the limiter give a similar performance. The shortcoming is that they have a deceleration blind zone, depending on the frequency constraints and SOGIs gain. If the allowed rate of change of frequency (RoCoF) is fixed, the fast response FLL can weaken this shortcoming. Specifically, if the RoCoF of low-inertia grids is considered, they could produce a severely biased estimation under the harmonics and dc offsets. The experimental results are given to validate the claims.]]>371112949129542170<![CDATA[Multiagent Deep Reinforcement Learning-Aided Output Current Sharing Control for Input-Series Output-Parallel Dual Active Bridge Converter]]>371112955129612044<![CDATA[Self-Decoupled and Integrated Coils for Modular Multitransmitter Wireless Power Transfer Systems]]>371112962129672506<![CDATA[Modified PWM Scheme to Reduce Reverse Conduction Loss in GaN-Based Independently Controlled Multiple Output Flyback Converter]]>off voltage. The highly inefficient reverse conduction (RC) of negative gate biased GaN devices leads to significant RC loss in the existing ICMOFC scheme. To mitigate this problem, this letter proposes a new pulsewidth modulation (PWM) scheme. The RC loss reduction is achieved by reducing the RC duration and RC current. The effectiveness of the proposed PWM strategy is analytically and experimentally verified using a 40-W dual output flyback converter. The results demonstrate a peak efficiency improvement of 1.26% over the existing ICMOFC scheme. Furthermore, the scheme also achieves high power density (51 W/in$^{3}$) and excellent cross-regulation (0.2%).]]>371112968129722505<![CDATA[Position Sensorless Control of IPMSM Using Adjustable Frequency Setting Square-Wave Voltage Injection]]>371112973129792754<![CDATA[Magnetizing and Leakage Inductance Integration for Split Transformers With Standard UI Cores]]>LLC prototype is built to verify the feasibility of the proposed magnetic integration method.]]>371112980129851653<![CDATA[A New Magnetic Coupler With High Rotational Misalignment Tolerance for Unmanned Aerial Vehicles Wireless Charging]]>371112986129912395<![CDATA[Settling-Angle-Based Stability Analysis for Multiple Current-Controlled Converters]]>$dq$-frame, the proposed stability criterion can accurately demonstrate the system stability and identify resonance sources according to the settling angles of the overall system and its subsystems, which are validated by simulation and control hardware-in-the-loop results.]]>371112992129972278<![CDATA[Hybrid Resonant Switched-Capacitor Converter for 48–3.4 V Direct Conversion]]>LLC converter. Compared to LLCs, hybrid resonant switched-capacitor converters (ReSCCs) make it possible to achieve large voltage conversion ratios without the need of high turns ratio transformers. In this letter, a novel hybrid ReSCC that performs a 48–3.4 V direct conversion is presented. A prototype of the proposed converter has been implemented, capable of providing a continuous output power of 440 W with a maximum efficiency of 96.3% at 30 A load current.]]>371112998130021961<![CDATA[Electrothermal Averaged Model of a Diode–IGBT Switch for a Fast Analysis of DC–DC Converters]]>371113003130133247<![CDATA[Adaptation of a Solid-State Marx Modulator for Electroactive Polymer]]>371113014130212302<![CDATA[Fabrication of Binder-Free and High Energy Density Yarn Supercapacitor for Wearable Electronics]]>2 nanofibers and multiwalled carbon nanotube deposited on carbon yarn through the facile electrophoretic deposition technique for flexible/wearable energy storage application. The binder-free, mechanically strong, and compact deposition of the active materials on carbon yarn promotes the charge/ionic transport. The fabricated YSC device delivers a capacitance of 36.8 mF/cm at 0.1 mA/cm current rate. Moreover, the device shows 90% capacitance retention after 10 000 cycles proving excellent mechanical stability for energy storage. Furthermore, the YSC shows 95% retention after 2000 bending cycles at 0.5 mA/cm, suggesting good flexibility of the device. The YSC device shows a maximum energy density of 11.5 μWh/cm and power density of 368 μW/cm, which is better than many YSCs reported in the literature. Three YSCs are integrated into a wearable fabric and glow a red LED for more than 5 min as demonstrated in the video proving its practical application.]]>371113022130293788<![CDATA[A General Method to Study Multiple Discontinuous Conduction Modes in DC–DC Converters With One Transistor and Its Application to the Versatile Buck–Boost Converter]]>$n$, which is the number of diodes conducting current passing exclusively through inductors when the transistor turns-off. For a given $n$ value, $2^{n}$ possible conduction modes are expected: 1 continuous mode and $2^{n}-1$ DCMs. The second step is to create a $n$-dimensional space called “$k$-space”. In the $k$-space, the converter operation describes a straight line when the load changes. This straight line called “converter trajectory” passes through different $n$-dimensional enclosures. Each one of these enclosures represents a different conduction mode. The third step is to determine the borders between conduction modes which are subspaces of $(n-1)$ dimensions. This method must be followed for both control strategies (i.e., open- and closed-loop control). The proposed method is applied to the ve-
satile buck-boost converter. Experimental results verify the theoretical analysis for all the identified conduction modes.]]>371113030130466635<![CDATA[A Unified Modeling Approach to Tapped Inductor Converters Accounting for the Leakage Inductance Effects]]>RC snubber is presented. Theoretical prediction of the steady-state and small-signal behavior of the converters were confirmed by simulation and experimental results.]]>371113047130593228<![CDATA[High-Definition High-Bandwidth DC/AC Power Conversion Through Binary Asymmetric Cascaded H-Bridges]]>371113060130692575<![CDATA[Dual-Frequency Bands Grid Impedance Emulator for Stability Test of Grid-Connected Converters]]>371113070130805083<![CDATA[Current-Limited Suboptimal Sliding Mode Control for Voltage-Regulated Synchronous Buck Converters]]>371113081130905884<![CDATA[Grid-Forming Vector Current Control]]>371113091131065526<![CDATA[Zero-Additional-Hardware Power Line Communication for DC–DC Converters]]>371113107131186544<![CDATA[A Dynamic ZVS-Guaranteed and Seamless-Mode-Transition Modulation Scheme for the DAB Converter That Maximizes the ZVS Range and Lowers the Inductor RMS Current]]>on currents of the DAB switches are adjusted in real-time guaranteeing the ZVS operation under various operating conditions. With the seamless transition, the inductor current can be smoothly regulated to ensure system stability. The proposed modulation scheme is introduced, analyzed, validated, and benchmarked in a 4.5 kW/100 kHz SiC-based DAB prototype, whose peak efficiency can reach 96.3% when operated at partial load.]]>371113119131348823<![CDATA[High-Gain Nonlinear Active Disturbance Rejection Control Strategy for Traction Permanent Magnet Motor Drives]]>371113135131466699<![CDATA[Novel Random Square-Wave Voltage Injection Method Based on Markov Chain for IPMSM Sensorless Control]]>d-axis is an effective and novel sensorless control scheme for interior permanent magnet synchronous motor at zero speed and low speed. However, the notable acoustic and electromagnetic noises induced by the conventional fixed-frequency signal injection are very harsh and shrill to hear, which limits the practical application. Aiming at reducing unnecessary acoustic noise, a novel random voltage injection method based on the Markov chain (MC) is proposed in this article. Two high-frequency square-wave voltages with different types of frequencies and amplitudes are randomly injected into the estimated d-axis by MC rules, and this way has spread spectrum characteristics, which can effectively reduce the unnecessary noise. In addition, a new signal demodulation compensation method considering the digital delay effect in high-frequency signals is proposed, which effectively reduces the position and velocity estimation errors. Then, the power spectra density of the induced high-frequency currents under the fixed frequency injection method and the proposed MC method are compared and analyzed. The high performance of the proposed MC method has been validated by the experiment drive platform and compared with the traditional fixed frequency under different control conditions.]]>371113147131574260<![CDATA[Quadratic Regression Model-Based Indirect Model Predictive Control of AC Drives]]>371113158131775805<![CDATA[A Carrier-Based Discontinuous PWM Scheme With Optimal PWM Sequences for a Five-Level Flying Capacitor Rectifier]]>371113178131918259<![CDATA[Fully Self-Powered Inductor-Less Electromagnetic Vibration Energy Harvesting System Using Auxiliary Coils for Hysteresis Current MPPT Control]]>2, with the overall efficiency of 77.6%. To charge a 10 mF supercapacitor from zero to 5 V, an average output power of 7.27 mW can be obtained with an average charging efficiency of 62.4%. In addition, the start-up method adopting auxiliary coil allows the system to cold-start when the output voltage is lower as 0.5 V. The proposed approach has been demonstrated to achieve high overall efficiency in milli-power self-powered EVEH system and also has significant advantages in cost and volume compared with using external devices to obtain reference.]]>371113192132046238<![CDATA[Passivation of Grid-Following VSCs: A Comparison Between Active Damping and Multi-Sampled PWM]]>371113205132164770<![CDATA[A Unified Design Approach of Optimal Transient Single-Phase-Shift Modulation for Nonresonant Dual-Active-Bridge Converter With Complete Transient DC-Offset Elimination]]>3711132171323716087<![CDATA[Direct Torque Control With Phase Commutation Optimization for Single-Winding Bearingless Switched Reluctance Motor]]>on angle and conduction region of each phase winding are chosen as the control targets, and the operation principle is introduced accordingly. Second, according to the difference of the torque generated by the neighboring phases, the output torque can be distributed more properly to obtain the higher torque–ampere ratio in the commutation region. Finally, the sectors divided in the electrical space are reorganized and the corresponding voltage vectors are optimized. Experimental results show that the proposed method can secure lower torque ripples, fewer switching times, and copper loss. In addition, the torque–ampere ratio is improved as well.]]>371113238132496822<![CDATA[Improved Position Sensorless Drive Method for IPMSM Based on Fully Discretized Model and Inductance Identification Utilizing Current Ripple]]>371113250132636225<![CDATA[Lifetime Performance Analysis of Imbalanced EV Battery Packs and Small-Signal Cell Modeling for Improved Active Balancing Control]]>$>$20 000 core-hours on the Niagara supercomputer at the SciNet HPC Consortium. Imbalance was introduced by sampling the cell capacity and impedance values from normal distributions with up to $sigma$=5% capacity/impedance variation at the beginning-of-life. Conventional balancing techniques are found to have little lifetime energy benefit over no balancing. A linearized equivalent circuit model (L-ECM) technique is introduced for small-signal analysis of battery packs with arbitrary capacity and impedance imbalance. An L-ECM-based balancing control is found to have a lifetime discharge energy improvement of up to 53.2% in the worst-case pack lifetime energy over no balancing. The L-ECM balancing control is demonstrated experimentally to provide 9.2% increased single-cycle discharge energy compared to no balancing in a Tesla Model S battery module.]]>371113264132764232<![CDATA[Realization of Signal-Injection Sensorless Control of SMPMSM With Saturation-Induced Saliency by Modification of Current Trajectory]]>dq-axes currents are measured from an experiment. The current response induced by the injected voltage is theoretically calculated based on the inductances. The induced current signal in every operable point on dq current plane is evaluated with a newly defined index variable. An optimal current trajectory for the SISC is proposed after the evaluation. By adopting optimal trajectory control instead of maximum torque per ampere control, the performance of the SISC in the SMPMSM can be conspicuously improved at the cost of slightly increased electrical loss. The proposed method is verified with experimental results.]]>371113277132875308<![CDATA[Selective Periodic Disturbance Elimination Using Extended Harmonic State Observer for Smooth Speed Control in PMSM Drives]]>371113288132982936<![CDATA[A Novel Sensitivity Analysis to Moment of Inertia and Load Variations for PMSM Drives]]>371113299133093987<![CDATA[Sub Line-Frequency Stability Analysis of Single-Phase Constant Power Loads Using Envelope Impedance]]>371113310133182854<![CDATA[Impact of Gate Resistance on Improving the Dynamic Overcurrent Stress of the Si/SiC Hybrid Switch]]>on-state loss under both light and heavy loads. However, the dynamic overcurrent stress experienced by the HyS under the heavy load has to be coped with to avoid reliability degradation and the maximum current rating limitation. This article comprehensively studies how gate resistances regulate the dynamic behavior of the HyS under the heavy load condition. Experiments and analyses are conducted for both turn-on and turn-off processes. It is found that the gate resistance is important for not only the dv/dt control but also the overcurrent suppression. Moreover, the lower switching loss can be achieved by adjusting gate resistances when the HyS operates at a heavy load, compared with the gate timing control. A guideline is developed for the design of the gate resistances. This study offers an insight into the role of gate resistances in switching performances of the HyS and an alternative way of coping with the dynamic overstress stress.]]>371113319133316057<![CDATA[Noninvasive and Accurate Measuring Method of the MMC and HVDC Circuit Breaker Action Moment Based on Transient E-Field Pulse]]>371113332133424056<![CDATA[Design of an Indirectly Coupled Filter Building Block for Modular Interleaved AC–DC Converters]]>N channels. A building block type configuration has been proposed using this topology, inspired by the power electronics building block (PEBB) nature. The purpose of the loop is to interconnect the parallel converters in series using an arrangement of CIs. In addition, a boost inductor has been introduced in the SL to realize a power factor correction rectifier operation. The CI serves as the circulating current filter while reflecting channel currents toward the SL. To meet conducted electromagnetic interference (EMI) limits, a two-stage LCLC filter has been integrated with the FBB by introducing the point of common coupling (PCC) connection between two stages for filter size reduction. A design procedure is presented to meet power quality, circulating current, and EMI limits as per industry standards (EN-55011 and IEEE-519/1594). The proposed FBB has been characterized using 3L-NPC converters enabled with 1.2 kV Silicon Carbide based modules with comprehensive performance validation up to three channels in parallel with 15-kW power rating per channel.]]>3711133431335710811<![CDATA[A Scalable Filter Topology for <inline-formula><tex-math notation="LaTeX">$N$</tex-math></inline-formula>-Parallel Modular Three-Phase AC–DC Converters by an Arrangement of Coupled Inductors]]>$N$). Considering interleaving, filters without any coupling may result in an overdesign. Meanwhile, filters that magnetically couple the paralleled converters may suffer from complexity in mechanical structure and $N-1$ redundancy. Based on these observations, this article proposes a filter structure that can be easily scaled to any number of converters. The proposed structure is comprised of a coupled inductor (CI) forming a loop of secondary windings, a single boost inductor on that loop, and a normally on normally closed (NONC) contactor per converter. Circulating currents are attenuated by the CI for any $N$. A single inductor rated for each channel realizes a boost inductor for a whole $N$-converters, which can bring a significant benefit on power density and cost. When one of the converter faults, the faulty converter can be easily isolated from the system by the NONC contactor, thus achieving $N-1$ redundancy. The proposed filter topology is experimentally verified with a 20-kW full-SiC modular ac–dc converter.]]>371113358133675671<![CDATA[A Dynamic Current Balancing Method for Paralleled SiC MOSFETs Using Monolithic Si-<italic>RC</italic> Snubber Based on a Dynamic Current Sharing Model]]>mosfets will cause unbalanced losses and reduce current capacity. The existing current balancing methods will make the circuit more complex or hard to design and implement. Hence, this article proposes a dynamic current balancing method by connecting monolithic Si-RC snubber between paralleled mosfets, which maintains a simple circuit structure and is easy to implement. Balanced dynamic currents can be achieved by adjusting the RC snubber connecting location. Meanwhile, low voltage spike and low switching oscillation can be achieved by using RC snubber. First, an analytical current sharing model is established for paralleled SiC mosfets. The key parameter affecting the balance of the drive circuit and then affecting the dynamic current sharing is obtained for the first time. Based on the conclusions of the model, this article then presents the current balancing method using RC snubber. Then, a power module with monolithic Si-RC snubber is designed, fabricated, and tested. Experimental results verify the current sharing model and the current balancing method. The current difference of the optimized module is reduced by more than 50% under different conditions. Finally, the effectiveness of this method in the module with more paralleled mosfets is verified.]]>371113368133849260<![CDATA[A Secondary-Side Semiactive 3-Phase Interleaved Resonant Converter Employing Multimode Modulation Scheme for Fast EV Charger Applications]]>f_{s} < f_{r} state to achieve boost operation. The minimum switching frequency of the converter is equal to the resonant frequency, which reduces the size of the magnetic components. Thus, the power density of the converter is improved. Compared with the traditional 3-phase interleaved LLC converter controlled by PFM, this converter widens the output voltage range without adding any circuit components. This article introduces the control mode, working principle and characteristics of the proposed converter in detail. A 10 kW experimental prototype is built to realize the output voltage of 100–1000V, which verifies the feasibility and effectiveness of the scheme.]]>371113385133975258<![CDATA[Partial Power Processing Multiport DC–DC Converter With Radial Module Connections]]>N-outputs(inputs) converter, one terminal of all N+1 modules is connected together to construct a radial structure, and another terminal is series/parallel connected with the input/output port. Each module only needs to process partial power caused by the voltage or current difference between input and output. Therefore, the required power rating of components is effectively reduced, contributing to low cost as well as low power loss. In this article, a PPP single-input dual-output converter with active bridge modules is also taken as an example to be introduced in detail, designed and experimented upon, which validates that high efficiency and high-power density can be achieved.]]>371113398134126578<![CDATA[<italic>LLC</italic> Resonant Converter Modulations for Reduced Junction Temperatures in Half-Bridge Mode and Transformer Flux in the On-the-Fly Morphing Thereto]]>LLC resonant converters are typically unsuitable to be applied for wide voltage-transfer ratio applications. With a full-bridge inverter, however, they can be operated in a variety of different modulation modes to extend the operating range. Most notably, by permanently turning on one switch and turning off the other switch of the same bridge leg, the LLC can be operated in half-bridge mode reducing the gain by a factor of two. In this modulation, however, the switch that is permanently turned on is stressed by the complete resonant current while exhibiting no switching losses. This article proves that the frequency-doubler modulation can better balance the losses among all switches and should be the preferred mode of operation favored over the conventional half-bridge modulation. This article analyzes the beneficial loss distribution and proposes an on-the-fly morphing modulation to the frequency-doubler modulation and reverse. Furthermore, the morphing magnetizing current offset of the morphing is analyzed to show that the offset can be influenced by the design of the magnetizing inductance and through the morphing modulation itself. Finally, an improved morphing modulation is presented showing that the morphing flux offset can be reduced substantially. Experimental measurement results on a 1.8 kW prototype show that by employing the frequency-doubler modulation, the maximum inverter temperature can be reduced by about 20 K and that the maximum transformer flux deviation during morphing can be reduced significantly on average by 78%. Both results enable the use of switches with a lower on-state resistance and the application of transformers with a smaller core cross-section.]]>371113413134275342<![CDATA[Simplified Approach for Acquisition of Submodule Capacitor Voltages of the Modular Multilevel Converter Using Low Sampling Rate Sensing and Estimation]]>371113428134383547<![CDATA[A Bidirectional Five-Level Buck PFC Rectifier With Wide Output Range for EV Charging Application]]>371113439134559862<![CDATA[SVPWM for Five-Level Active Neutral-Point-Clamped Converter Based on Multispace Voltage Vector Mapping and Midpoint-Voltage Self-Balancing Strategy]]>371113456134675351<![CDATA[Transformerless High-Gain Three-Port Converter With Low Voltage Stress and Reduced Switches for Standalone PV Systems]]>371113468134835107<![CDATA[Dual-Buck Three-Switch Leg Converters With Reduced Number of Passive Components]]>on simultaneously. In this article, a new dual-buck structure is proposed for three-switch leg converters. The proposed structure is reliable because of no shoot-through concerns and high quality of output waveforms can be obtained due to the reduction in pulsewidth modulation deadtime. Unlike the conventional dual-buck three-switch leg that uses many passive components such as four current limiting inductors and three external diodes, the new dual-buck three-switch leg uses only one current limiting inductor with two external diodes. To verify the performance, the proposed three-switch legs are used in single-phase dual-output inverter and detailed theoretical analysis, simulation, and experiments are performed. Both continuous and discontinuous modulation schemes are applied and it has been figured out that discontinuous modulation scheme can improve the dc-link voltage utilization in the common-frequency mode of operation.]]>371113484134988935<![CDATA[Quasi-Single-Stage Current-Fed Resonant AC–DC Converter Having Improved Heat Distribution]]>off with the voltage closed to zero at high instantaneous power and with the voltage closed to the half of the output voltage at low instantaneous power. Switching losses at the primary-side bottom switches are reduced; this change improves the heat distribution over the switches. The primary-side duty-cycle fixed at 0.5 results in negligible input current ripple; this trait can significantly reduce the size of filter inductor at the grid side. Experimental results show the effectiveness of the proposed ac–dc converter and its improved heat distribution against a conventional solution.]]>3711134991351210606<![CDATA[A High-Precision Sensor Based on AC Flux Cancellation for DC Bias Detection in Dual Active Bridge Converters]]>371113513135248362<![CDATA[Lifetime-Based Selection Procedures for DC Circuit Breaker Varistors]]>371113525135372146<![CDATA[In-Depth Design and Multiobjective Optimization of an Integrated Transformer for Five-Phase LLC Resonant Converters]]>371113538135534546<![CDATA[Inverter Design Considerations for Variable-Pole Induction Machines in Electric Vehicles]]>371113554135657065<![CDATA[Comparative Analysis and Optimization of Novel Pulse Injection Sensorless Drive Methods for Fault-Tolerant DC Vernier Reluctance Machine]]>371113566135763511<![CDATA[Short-Circuit Characteristic of Single Gate Driven SiC MOSFET Stack and Its Improvement With Strong Antishort Circuit Fault Capabilities]]>(mosfet) stack with strong antishort circuit fault capabilities is proposed. By adding auxiliary circuits to adjust the driving process of the single gate driver, the SiC mosfet stack can be automatically turned off in both SC conditions of fault under load and hard switch fault, while the normal working principle of the stack is not influenced. Neither active control nor overcurrent detection is required, which is the biggest merit of the proposed topology. Its design and analysis are presented in detail, followed by the validation by conducting simulations and experiments.]]>371113577135865379<![CDATA[A Sensorless Control Strategy of Injecting HF Voltage Into <italic>d</italic>-Axis for IPMSM in Full Speed Range]]>d-axis for the interior permanent magnet synchronous motor (IPMSM) in the full speed range. The defined quadratic virtual back electromotive force model can be adopted in the full speed range, and thus, there is no need to design a transition algorithm from the zero–low speed to the medium–high speed. Besides, the accurate model of IPMSM is applied to eliminate the error caused by ignoring the stator resistance. Furthermore, the estimation error caused by the filter and system delay during demodulating the HF current in the conventional HF voltage injection method is avoided. Compared with the method of injecting HF voltage into the q-axis, the proposed method has smaller torque ripple and smaller injected voltage. The effectiveness of the proposed method is verified by experimental results.]]>371113587135975139<![CDATA[Maximum Torque Per Total Ampere Strategy for Vector-Controlled Brushless Doubly Fed Induction Machine Drive Taking Iron Loss Into Account]]>371113598136052511<![CDATA[Performance and Analysis of <italic>N</italic>-State Random Pulse Position SVPWM With Constant Sampling Frequency]]>N-state random pulse position space vector pulsewidth modulation is proposed. This method randomly selects one of the N selected carrier patterns with equal probability in each carrier period, resulting in N different pulse position states. By applying two-dimensional Fourier analysis, the additional multiplication factor in the derivation results, named harmonic dispersion coefficient in this article, can intuitively explain the principle from the perspective of mutual cancellation of complex vectors in different directions. All dominant PWM harmonics are significantly dispersed except those located nearby the Nth PWM frequency and its multiples when using the proposed method. Besides, power losses and switching counts are detailed discussed. Both simulation and experimental results verify the effectiveness of the method at last.]]>371113606136259482<![CDATA[Reconsideration on Capacitor Ripple Voltage of CHB-StatCom: Observation, Modeling, Analysis, and Application of <italic>Ripple Effect</italic> From Design Perspective]]>ripple effect phenomenon wherein the capacitor ripple voltage generates the fundamental-frequency output ac voltage of a cascaded H-bridge-based static synchronous compensator (CHB-StatCom) is revealed and investigated in this work. First, an observation method of the ripple effect for the CHB-StatCom is presented. Then, the reason why CHB-StatCom has a ripple effect is explained. Subsequently, the accurate mathematical model of the CHB-StatCom considering ripple effect is reformulated. Based on the remodeled mathematical model, the cognition inaccuracy of the conventional design of a CHB-StatCom is analyzed, and a new cost-majorization-oriented (CMO) design principle is proposed to optimize the cost of CHB-StatCom. The proposed CMO design needs a lower dc-link voltage to generate the same maximum fundamental-frequency output ac voltage compared with the conventional design, thereby reducing the cost of CHB-StatCom. The simulation and experimental results validate the correctness and effectiveness of the analysis.]]>371113626136406935<![CDATA[Influence of Thermal Coupling on Lifetime Under Power Cycling Test]]>T_{vjmax} and temperature swing ΔT_{vj}, the influence of thermal coupling on lifetime and failure mode is investigated. The root cause of why thermal coupling influences lifetime and the failure mode is discussed by finite-element analysis. Transient thermal impedance is used to calibrate the simulation model. The Influence of thermal coupling on chip surface and solder layer temperature distribution is analyzed under the same test conditions. Furthermore, two parameters are extracted from the temperature distribution of chip surface as flags of failure mode determination. Finally, taking thermal coupling into account, combined with direct copper bonding structure, an improved layout is recommended in terms of lifetime.]]>371113641136518201<![CDATA[Universal Sensorless Open-Circuit Fault Detection and Isolation Method of Dual-Active-Bridge Converters With Low-Cost Diagnostic Circuit]]>3711136521366713364<![CDATA[Open-Circuit Fault Diagnosis Method in NPC Rectifiers Using Fault-Assumed Strategy]]>371113668136838182<![CDATA[A Data-Driven Method With Mode Decomposition Mechanism for Remaining Useful Life Prediction of Lithium-Ion Batteries]]>371113684136951746<![CDATA[A High Voltage Gain ZVT Quasi-Z-Source Converter With Reduced Voltage Stress]]>371113696137108170<![CDATA[Analytical Damping Contribution Assessment Method of Multiconverters System Based on Energy Network Model]]>371113711137295536<![CDATA[Fixed-Frequency Phase-Shift Modulated Capacitor-Clamped <italic>LLC</italic> Resonant Converter for EV Charging]]>LLC resonant converter has been widely employed in electric vehicle (EV) charging applications. However, conventional frequency-modulated LLC converters generally demand a wide frequency variation range and are difficult to scale up, while the traditional phase-shifted (PS) LLC converters have the issues of ease of losing soft-switching condition and high turn-off current. In response to these challenges, this article proposes a new method for EV charging applications based on the capacitor-clamped LLC converter topology and fixed-frequency PS modulation. Compared with traditional PS LLC converters, the proposed method can achieve 1) smaller phase shift variation range, 2) lower turn-off current, and 3) wider soft switching range, resulting in higher efficiency. An 825-W prototype with 200 V input and 125–210 V output range verified the features of the proposed idea, and the efficiency reaches 97.82% at the maximum output power.]]>371113730137425591<![CDATA[Single Grid-Current Sensor-Controlled Weak-Grid-Following Inverters: A State-and-Disturbance-Observer-Based Robust Control Scheme Achieving Grid-Synchronization and Disturbance Rejection]]>LCL-filtered inverter system, and proposes an intuitive robust stability analysis method in the linear framework to handle power control and grid voltage variations in engineering practice. Specifically, through the use of a state-and-disturbance observer, the lumped-disturbance compensated suppression and nominal system full-state feedback technologies are equivalently realized. And the lumped-disturbance estimation carrying voltage phase information at the point of common coupling is further used as synchronization target of the phase-locked loop (PLL) to achieve grid-following control, and the resulting phase-shift is further corrected by accurate phase compensation. In addition, due to the nonlinear nature of the PLL and the power control and grid voltage variations, the system analysis is faced with the dilemma of complex nonlinear analysis or small-signal analysis without a fixed equilibrium point. In this case, a PLL small-signal model with bounded parameter perturbation characterizing power control and grid voltage variations is developed, and further incorporated into the output impedance modeling of the single-sensor grid-following controlled inverter. According to the edge theorem, the system stability in the studied uncertain region is analyzed via four edge output impedances, and appropriate control parameters are selected accordingly. Finally, the experimental results from a downscaled prototype are provided to verify the effectiveness of the proposed single-sensor grid-following control scheme.]]>3711137431375410730<![CDATA[Zero Leakage Current Single-Phase Quasi-Single-Stage Transformerless PV Inverter With Unipolar SPWM]]>371113755137664493<![CDATA[Flexible Transfer Converters Enabling Autonomous Control and Power Dispatch of Microgrids]]>371113767137815136<![CDATA[An Interleaved Soft Switched High Step-Up Boost Converter With High Power Density for Renewable Energy Applications]]>3.]]>371113782137989544<![CDATA[Power Model Free Voltage Ripple Suppression Method of Three-Phase PWM Rectifier Under Unbalanced Grid]]>371113799138074109<![CDATA[A Tri-Port Current-Source Soft-Switching Medium-Voltage String Inverter for Large-Scale Solar-Plus-Storage Farms]]>$20,mathrm{kW/500,V}$ in different test cases with custom-built prototypes. The contributions of this work make the TMVSI a viable solution to SPS farms and unleash its potential for LCOE reduction.]]>371113808138239024<![CDATA[Efficient and Fast Active Equalization Method for Retired Battery Pack Using Wide Voltage Range Bidirectional Converter and DBSCAN Clustering Algorithm]]>DBSCAN (density-based spatial clustering of applications with noise) clustering control strategy. Thanks to the wide voltage range and bidirectional buck-boost characteristics of the four-switch bidirectional converter, the battery energy can be reasonably redistributed between the battery and the super capacitor. The converter operating in synchronous rectification mode can not only achieve bidirectional energy flow in a wide voltage range, but also has a high energy conversion efficiency. The DBSCAN clustering algorithm is used to divide all battery cells into groups, and each group may contain one or more adjacent and nonadjacent battery cells. First, the nonadjacent single cells are balanced and integrated into adjacent group with the closest voltage. Then, the groups with different voltages are balanced by group-to-group, thereby realizing rapid balance of the entire battery pack. In order to verify the effectiveness of the proposed method, simulations and experimental verification were carried out. The experimental results show that, comparing with traditional battery balancing methods, the proposed method achieves shorter balancing time and higher balancing efficiency.]]>371113824138333086<![CDATA[Cascaded Controller for Controlling DC Bus Voltage in Mismatched Input Powers]]>371113834138478445<![CDATA[Passivity-Based Multisampled Converter-Side Current Control of <italic>LCL</italic>-Filtered VSCs]]>LCL-filtered grid-connected converters. In the practical implementation, an antialiasing filter is required to remove the sampled switching harmonics and suppress the low-order aliasing. However, due to the phase lag from the antialiasing filter, the dissipative region of converter output admittance still cannot be lifted to switching frequency, which leads to a risk of system instability under wide grid admittance variation. In order to tackle this challenge, a filter capacitor voltage feedforward scheme using multisampling is proposed in this article. Consequently, the dissipation below the switching frequency is harvested for a three-phase converter. Furthermore, by doubling the multisampling rate, the proposed method can extend the dissipative region to the apparent switching frequency for a single-phase converter using unipolar modulation. The experimental results validate the effectiveness of the proposed method on a down-scaled single/three-phase converter.]]>371113848138606787<![CDATA[Zero-Voltage Switching Regulation Strategy of Full-Bridge Inverter of Inductive Power Transfer System Decoupled From Output Characteristics]]>371113861138734297<![CDATA[Widening the Operating Range of a Wireless Charging System Using Tapped Transmitter Winding and Bifrequency Pulse Train Control]]>371113874138834528<![CDATA[A Unipolar-Duty-Cycle Hybrid Control Strategy of Series–Series Compensated IPT System for Constant-Current Output and Efficiency Optimization]]>371113884139019371<![CDATA[Asymmetric Bidirectional Capacitive Power Transfer Method With Push–Pull Full-Bridge Hybrid Topology]]>CLC–LCL) resonant topology is designed for this bidirectional conversion mode with constant output voltage characteristics in both directions. A hybrid power flow regulation strategy is proposed by integrating multiple zero-voltage switching soft-switching operating points switching and phase-shifted mode. This method overcomes the problem of mixing two different type topologies (push–pull and full bridge) with two different power regulation modes (switch soft-switching operating points and phase shift), which provide a way to make two different chargers compatible. Simulation and experimental results verified the proposed method.]]>371113902139135122<![CDATA[H∞ Robust Control for ICPT System With Selected Weighting Function Considering Parameter Perturbations]]>371113914139297342<![CDATA[High-Misalignment Tolerance Wireless Charging System for Constant Power Output Using Dual Transmission Channels With Magnetic Flux Controlled Inductors]]>x- and y-direction misalignment ranges reach ±95% and ±47%, and system efficiency exceeds 90%, superior to the commonly used anti-misalignment methods.]]>3711139301394513171<![CDATA[Self-Synchronized Class E Resonant Rectifier by Compensating Propagation Delay for Multi-MHz Switching Applications]]>mosfets instead of diodes. Even with the mosfets, it is still challenging to generate an accurate synchronous signal from the input source in the multi-MHz wireless power transfer (WPT) systems due to the propagation delay from the integrated circuit (IC) components and the gate driver. In general, the propagation delay is more than 10 ns, a significant period in the multi-MHz operation. To mitigate the propagation delay, we present the self-synchronized rectifier, sensing the signal in the $C_{s}$-$L_{s}$ network. The proposed design creates a proper gate signal to the active device in the rectifier by measuring the voltage of the node between $C_{s}$-$L_{s}$ resonant filter. In the experiments, we tested the driving method in the class E rectifier at an output power of 228 W and a switching frequency of 13.56 MHz. While the total propagation delay was 8 ns, including the gate-driver and comparator, the leading phase of the sensing voltage successfully offsets the driver’s propagation delay.]]>371113946139545926<![CDATA[A Dual-Frequency WPT Based on Multilayer Self-Decoupled Compact Coil and Dual <italic>CLCL</italic> Hybrid Compensation Topology]]>CLCL hybrid compensation topology and multilayer self-decoupled compact coils (MLSDCCs). It extends the transmission distance corresponding to stable high transmission power and efficiency. Based on the parameter constraints of compensation capacitances and inductances, CLCL hybrid compensation topology realizes simultaneous resonance at fundamental and third harmonic frequencies. A typical inverter can meet the requirements of dual-frequency WPT without complex control or more number and improve the utilization rate of square voltage. According to interleaving and rotary stacking of unipolar and bipolar coils in MLSDCCs, the couplings between layers and unnecessary couplings of magnetic coupling mechanism (MCM) are eliminated. Only the main couplings for power transmission are retained and the volume of MCM is reduced. Finally, a 1 kW experimental platform is built. Compared with the typical single-frequency WPT, the maximum transmission power is increased by 2.8%, while the maximum transmission efficiency is only reduced by 0.53%. The main advantage is that the transmission distance corresponding to continuous high-power transmission (in the range of 95%–100% maximum receiving power) is increased by 2.75 times. When the lateral offset distance of the Y-axis is one-sixth of the coil side length, the transmission efficiency decreases by only 1.47%.]]>371113955139654567<![CDATA[Enhanced Power Conversion Capability of Class-E Power Amplifiers With GaN HEMT Based on Cross-Quadrant Operation]]>$mathrm{Omega }$. Compared with conventional Class-E amplifiers, the power conversion capability of the proposed amplifier is increased up to three times from 0.49 to 1.69 with a slight reduction in efficiency. Such cross-quadrant mode amplifiers can be used to improve the power conversion capability and to reduce the peak switch voltage at the same output power level.]]>371113966139772323<![CDATA[A Frequency Regulation Strategy for Dynamic Process Noise Suppression in LCC-S WPT Systems]]>LCC-S wireless power transfer systems, which aims at suppressing serious switching noise in the starting-up phase of the inverter. By detecting the magnitude and direction of the output current of the inverter, a delayed turn-on signal is timely applied to ensure that the inverter can achieve ZVS in all operating conditions. The origins of the mechanism of switching noise are presented, and the closed-loop stability of the system under the proposed control strategy is analyzed. The correctness of the theoretical analysis and the effectiveness of the control strategy is verified by both simulation and experiment results. This control strategy is technically effective for all resonant converters in the switching noise suppression. Finally, the method is verified in a 1.5 kW, 85 kHz, 310V LCC-S WPT system, and the experimental results show that the FRS can reduce electromagnetic interference by 13 dB in one dynamic starting-up cycle.]]>371113978139883749<![CDATA[IEEE Power Electronics Society]]>3711C3C335<![CDATA[Administrative Committee]]>3711C4C427