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CPSS Transactions on Power Electronics and Applications is sponsored and published by China Power Supply Society and technically co-sponsored by IEEE Power Electronics Society. It publishes original and high-quality peer-reviewed papers in the field of power electronics and its applications. With the goal of promoting the technology of power electronics including concepts, theory, modeling and control, analysis and simulation, emerging technology and applications, CPSS TPEA is expected to be a favorable platform to strengthen information exchange in this area. All accepted papers will be published in IEEE Xplore and be indexed in Ei Compendex.

    • Switching Power Supply: DC/DC Converter, Power Factor Correction Converter

    • Inverter and Control: DC/AC Inverter, Modulation and Control

    • Power Devices and Applications: Si, SiC and GaN Devices

    • Magnetics, Passive Integration, Magnetics for Wireless and EMI

    • Control, Modeling, Simulation, System Stability and Reliability

    • Conversion Technologies for Renewable Energy and Energy Saving

    • Power Electronics Applied to Transmission and Distribution Systems

    • Power Electronics Applied to Electric Vehicles and Railway Systems

    • Power Electronics Applied in Lighting and Consumer Electronics

Call for Papers

Special Issue on Power Quality Conditioning in Modern Power Grids Integrated Emerging Power Electronic Systems, 2021

Deadline for Submission of Manuscripts: July 1, 2021
Guest Editor-in-Chief: Carl Ngai Man Ho, University of Manitoba, Canada
Guest Co-Editor-in-Chief: Chi-Seng Lam, University of Macau, Macau

Current Issue

CPSS TPEA Vol.6 No.3 (September 30, 2021)


The Optimization of Reactive Power for Distribution Network With PV Generation Based on NSGA-III

Yongle AI, Mingzhu DU, Zhihang PAN, and Gangxing LI

Abstract A reactive power optimization algorithm for distribution network with photovoltaic (PV) generation is proposed to address the problems of power quality degradation, system active power losses increase and system instability caused by the connection of PV generation. Firstly, a multi-objective reactive power optimization model is established with the objective functions of minimizing system active power losses, controllable loads reduction, and PV active power reduction. Secondly, the PV power generation system is modeled mathematically. Thirdly, using the non-dominated sorting genetic algorithm (NSGA-III) to solve the model. Finally, the feasibility and validity of the proposed method are verified by the simulation with the modified IEEE123-bus system.

Open-Circuit Fault Diagnosis for Cascaded H-Bridge Multilevel Inverter Based on LS-PWM Technique

Gang ZHANG and Jingrong YU

Abstract Multilevel inverters have been widely used in high voltage and high-power applications on account of their remarkable performance in recent years. The multilevel inverters have an increased chance of switch fault due to a considerably large number of semiconductor switches associated with the power conversion. Therefore it is crucial to detect and locate faults quickly. In this context, an open-circuit fault diagnosis method for cascaded H-bridge multilevel inverter (CHBMI) based on the level-shifted pulse width modulation (LS-PWM) technique is proposed. Unlike the fault diagnosis based on the algorithm, the proposed method only needs a certain logical judgment to diagnose the fault based on subtle fault characteristics. The output voltage of the H-bridge and load current are used for fault diagnosis.

An Order-Reduction Method of Interharmonic Analysis Model Based on the Principle of Interharmonic Interaction

Qingtian LUO, Qing ZHONG, Gang WANG, and Longjun WANG

Abstract This paper presents a method on order-reduction of interharmonic analysis based on the principle of interharmonic interaction. First, we obtain the transformation between dynamic phasors in dq coordinate and dynamic phasor sequence compo- nents (DPSCs). Then, a full-order interharmonic analysis model is developed taking the voltage and current double closed-loop controller into account via the transformation mentioned before. The principle of interharmonic interaction is studied based on the full-order DPSCs model. On the basis of the principle, the dominant frequencies for all kinds of variables are selected and a reduced-order interharmonic analysis model is derived. Finally, two examples are presented for illustration of the proposed method. It is shown that the reduced-order interharmonic analysis model based on the principle of interharmonic interaction keeps high accuracy with substantial computational savings.

A Method for Analyzing the Voltage Deviation Isolation Performance With an Application in Two-Stage High-Frequency Isolated AC-DC Converters in LVDC Systems

Yangxin QIU, Qing ZHONG, Yuming ZHAO, Gang WANG, and Longjun WANG

Abstract The differences between the power quality at the AC and DC sides, caused by AC-DC converters with constant DC voltage control, commonly exist in low-voltage direct current (LVDC) systems. The voltage deviation isolation (VDI) is one of the typical phenomenons. A method is proposed to analyze the VDI performance and applied in two-stage high-frequency isolated AC-DC converters, which can isolate not only the faults but also the voltage deviation at the AC side and improve the voltage quality at the DC side. First, the voltage deviation isolation ratio (VDIR) is defined to assess VDI. Based on VDIR, the operation characteristics of AC-DC converters with constant DC voltage control are analyzed and the range of VDI is defined. Second, with considering the conditions for stable operation of AC-DC converters, constraints on power transmission limit and static stability limit are used to determine the range of VDI. Third, a simulation model is established and the feasibility and validity of the method are verified. Finally, the main factors affecting the range of VDI are analyzed. Actually, the method proposed is adapted to various types of AC-DC converters with constant DC voltage control.

H Optimal Control Design of Static Var Compensator Coupling Hybrid Active Power Filter Based on Harmonic State-Space Modeling

Cheng GONG, Wai-Kit SOU, and Chi-Seng LAM

Abstract Compared with the conventional active power filter (APF), the static var compensator coupling hybrid active power filter (SVC-HAPF) has distinct characteristics of low DC-link operating voltage, which can lower the system and operational costs. It also has a wider operational range than the conventional hybrid active power filter (HAPF). In this paper, a harmonic state-space (HSS) modeling is firstly proposed to address the nonlinearity issue of the SVC-HAPF. The HSS based SVC-HAPF model is linear time-invariant (LTI), which enables the optimal control techniques. Then, the linear matrix inequality (LMI) based H optimal control design is proposed, which finds the optimal controller parameters via convex optimization algorithm. The proposed controller for the SVC-HAPF achieves high steady-state accuracy, fast transient response, and fixed switching frequency simultaneously. Finally, simulation and experimental results are also provided to verify the effectiveness and performance of the optimal controller for the SVC-HAPF in comparison with the recent developed state-of-the-art multi-quasi-proportional-resonant (MQPR) controller, which shows superior control performances.

Negative Sequence Current and Reactive Power Comprehensive Compensation for Freight Railway Considering the Impact of DFIGs

Diwen XIAO, Minwu CHEN, and Yinyu CHEN

Abstract To solve the power quality problems caused by freight railways in weak grids with high penetration of wind generation, this paper proposes a comprehensive control method for negative sequence current (NSC) suppression and reactive power compensation. Firstly, a co-phase traction power supply system (CTPSS) is introduced, and its compensation principle is analyzed. Secondly, to bring a doubly fed induction generator (DFIG) into full play in suppressing voltage unbalance (VU) in the grid, a VU compensation model of stator is developed. Moreover, a comprehensive compensation method is presented to achieve the dynamic compensation of VU and reactive power. Finally, the effectiveness of the proposed approach is demonstrated using a simulation, which can fully solve the power quality issues and effectively reduce the capacity of the CTPSS.

Voltage Sag Source Location Estimation Based on Optimized Configuration of Monitoring Points

Ganyun LV, Chenjie CHU, Yu ZANG, and Guangyu CHEN

Abstract In order to reduce the influence of monitoring blind area caused by the uncertainty of fault resistance on voltage sag source location in transmission line short-circuit fault, a voltage sag source location estimation method based on optimal configuration of system monitoring points and fault parameter estimation is proposed. Considering the observability of voltage sag in various short-circuit faults, the importance index of measuring points in the system is proposed, so as to construct the optimal configuration model of monitoring points. Based on the optimal configuration scheme of monitoring points, the sag source location model is established, and the adaptive cuckoo algorithm is used to estimate the parameters of fault line, fault resistance and fault distance. Finally, the simulation is verified by IEEE-30 node standard test system. The results show that the proposed method has higher fault location accuracy and more engineering applicability than the traditional method.

The Modular Active Capacitor for High Power Ripple Attenuation

Vinay BHUS, Jyun LIN, and George WEISS

Abstract In this paper we propose a modular realization of the active capacitor, where each module is composed of a bidirectional converter and a buffering capacitor. This modular capacitor is a two-terminal device that can automatically adapt itself to different DC bus voltages, and is meant to fi lter out a wide range of low frequency ripples. Our plug-and-play control approach means that the modular active capacitor can be directly connected to the DC bus without any extra connections, just like a passive capacitor. The proposed modular design improves the overall reliability, providing fault tolerance operation. We investigate the application of our type of active capacitor in DC microgrids, where multiple active capacitors are distributed at different nodes. It is shown that ripple power can be shared in proportion to the storage capacity of the active capacitors without any communication between them. We also offer a mathematical stability analysis of a DC microgrid in which the admittances of all the devices satisfy a certain condition that is less restrictive than being positive-real (and which is satisfied by our proposed design). The modular active capacitor concept has been verifi ed in simulations and experiments.

Popular Articles

Prof. LIU Jinjun

College of Electrical Engineering

Xi'an Jiaotong University

No.28, Xianning West Road, Xi'an,

Shaanxi, 710049, China

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