Optimization of Filter Based on Power Factor and Voltage Sag Depth for Medium-Voltage Cascaded H-Bridge Dynamic Voltage Restorer
Chen Guodong1,2, Zhu Miao2, Cai Xu2
1.Technology Center Shanghai Electric Power Transmission & Distribution Group Shanghai 200042 China 2.Wind Power Research Center Shanghai Jiao Tong University Shanghai 200240 China
Abstract The medium-voltage cascaded H-bridge dynamic voltage restorer (DVR) is embedded into the grid in series for suppressing voltage sags.The parameter selection of the LC filter in the DVR is a key factor which decides the cost and volume of the DVR.Therefore,the paper discusses the requirement of the LC filter in the medium-voltage cascaded H-bridge DVR systematically,then derives boundary conditions of the inductance and the capacitance,and analyzes parameter variations under different conditions of voltage sags depth and power factors.Finally,an optimized design method of the LC filter is proposed for the medium-voltage cascaded H-bridge DVR with the consideration of double impact factors.The LC filter optimization procedure of the 10 kV/2 MW DVR prototype is presented in detail,and the validity is demonstrated by the simulation in Matlab/Simulink and experimental results in static and dynamic test.
Chen Guodong,Zhu Miao,Cai Xu. Optimization of Filter Based on Power Factor and Voltage Sag Depth for Medium-Voltage Cascaded H-Bridge Dynamic Voltage Restorer[J]. Transactions of China Electrotechnical Society, 2016, 31(9): 75-84.
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2016, Vol. 31 
