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《Transactions of China Electrotechnical Society》 2015-09
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Research on Active Suppression Method of Three-Phase Unbalanced Overvoltage for Distribution Networks

Zeng Xiangjun;Huang Mingwei;Wang Wen;Chen Rui;Fan Bishuang;Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology;Electric Power Research Institute of Guangdong Power Grid;  
The unbalanced three-phase impedances to the ground will cause three-phase unbalanced voltage in the distribution networks with ineffective earthed methods. The unbalanced over voltage has influence on the reliability and security of the distribution network. The overvoltage generating mechanism is analyzed in this paper. Based on that,an active over voltage suppression method is proposed. The suppression device,equivalent to a controllable current source, is developed and installed between the neutral point and the ground. It can optimally control the phase and amplitude of the injection current,and then force the three-phase voltage to be in balance. The simulation analysis and the prototype experiment results show that this method can suppress the three-phase unbalanced overvoltage quickly and effectively without measuring the three-phase impedances to the ground. The neutral point displacement voltage can be suppressed to zero in this way.
【Fund】: 国家自然科学基金(61233008、51277014、51207014、51407014);; 湖南省科技重大专项(2012FJ1003);; 湖南省高校产业化培育项目(12CY007)资助项目
【CateGory Index】: TM761.12
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【Citations】
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1 ZENG Xiangjun1,XU Yao1,CHEN Bo2,ZHANG Ping1,YUAN Chao1(1.Changsha University of Science & Technology,Changsha 410076,China; 2.Shandong Electric Power Engineering Consulting Company,Jinan 250013,China);A Novel Measuring Method of Capacitive Current for Insulated Neutral Distribution Networks[J];Automation of Electric Power Systems;2009-02
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1 FAN Xing-ming1,2,ZHANG Xin1,CHEN Ke1,FAN Jian-rong2,LIANG Cong3,SHI Wei-jian2(1.Dept.ofElectrical Engineeringand Automation,Guilin UniversityofElectronic and Technology,Guilin 541004,Guangxi,China.2.Sunrise Group,Ningbo 315700,Zhejiang,China.3.Guilin Power Capacitor Co.,Ltd,Guilin 541004,Guangxi,China.);A Smart Fault Indicator System and Its Application Research for Distribution[J];Electrical Measurement & Instrumentation;2012-06
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