中国电源学会电子资源平台

关键词

voltage sag

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doubly fed induction generator

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open-circuit fault

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sag source location model

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optimal configuration of monitoring points

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fault resistance

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Cuckoo search

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level shifted pulse width modulation

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Cascaded H-bridge multilevel inverter

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ripple attenuation

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(twisted) positive-real

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interleaving modular converter

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active power filtering

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Active capacitor

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voltage un-balance

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freight railway

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Co-phase traction power supply system

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fault diagnosis

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reactive power optimization

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non-dominated sorting genetic algorithm(NSGA-III)

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作者

Gang WANG

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Yuming ZHAO

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Yangxin QIU

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Chi-Seng Lam

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Carl Ngai Man Ho

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Guangyu CHEN

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Yu ZANG

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Chenjie CHU

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Ganyun LV

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Jingrong YU

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Gang ZHANG

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George WEISS

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Jyun LIN

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Vinay BHUS

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Qing Zhong

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Yinyu CHEN

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Minwu CHEN

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Diwen XIAO

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Gangxing LI

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Zhihang PAN

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获取方式

会员

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付费

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限免

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当前 1 - 9 , 共 9 条记录

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The Modular Active Capacitor for High Power Ripple Attenuation 会员

期刊论文

作者： Vinay BHUS , Jyun LIN , George WEISS

页码： 251 - 262

摘要

2025/01/01

6

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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 filter 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 verified in simulations and experiments.

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

期刊论文

作者： Chenjie CHU , Yu ZANG , Guangyu CHEN , Ganyun LV

页码： 242 - 250

摘要

2021/01/01

10

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

期刊论文

作者： Diwen XIAO , Minwu CHEN , Yinyu CHEN

页码： 235 - 251

摘要

2021/01/01

7

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

期刊论文

作者：

页码： 227 - 239

摘要

2021/01/01

5

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

期刊论文

作者： Yangxin QIU , Qing Zhong , Yuming ZHAO , Gang WANG , Longjun WANG

页码： 218 - 226

摘要

2021/01/01

7

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

期刊论文

作者： Qingtian LUO , Qing ZHONG , Gang WANG , Longjun WANG

页码： 209 - 217

摘要

2021/01/01

6

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

期刊论文

作者： Gang ZHANG , Jingrong YU

页码： 201 - 212

摘要

2021/01/01

6

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

期刊论文

作者： Mingzhu DU , Zhihang PAN , Gangxing LI

页码： 193 - 204

摘要

2021/01/01

6

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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.
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Editorial for the Special Issue on Power Quality Conditioning in Modern Power Grids Integrated Emerging Power Electronic Systems 会员

期刊论文

作者： Carl Ngai Man Ho , Chi-Seng Lam

页码： 191 - 192

摘要

2021/01/01

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DUE to the environment concerns, energy risks, fossil fuel problems, and the evolution of smart grid, the penetration of renewable energy systems and electric transportation systems is booming with a fast pace. Besides, with the proliferation and increased use of motor loadings and power electronic devices into all kinds of energy processing systems, the power quality(PQ) problems such as: reactive power and harmonics become more serious. This kind of PQ problems distort the source, lower the efficiency, and may cause instability, thus it makes negative impacts on the performance and reliability of grid or microgrids. In this regard, to ensure secure, reliable, and efficient power supply and transmission in power-electronics-controlled systems, PQ issues should be properly taken care of. That is, the desires to develop PQ-free or PQ-compensated power electronic systems and infrastructures are of high interest and importance. Hence, we organized this Special Issue on Power Quality Conditioning in Modern Power Grids Integrated Emerging Power Electronic Systems for targeting the analysis, topology and control strategy of PQ-free or PQ-compensated power converters in renewable energy systems, electric transportation systems, PQ conditioning systems, industrial automation systems, lighting systems, etc., which also includes the detection, characterization and analysis methods of the PQ issues.
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Vol.6 No.3 2021