Analysis and Suppression of Common-Mode Current for Storage System Based on Cascaded H-Bridge Converter
Chen Qiang1, Li Rui1, Gao Ning1, Cai Xu1, Lu Zhigang2
1. Wind Power Research Center School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China; 2. Electric Power Research Institute China Southern Power Grid Guangzhou 510080 China
Abstract:Cascaded H-bridge converter is suitable for battery energy storage system. However, bulky batteries and long dc cables, which connect power modules with battery cabinets, introduce significant parasitic parameters into cascaded H-bridge battery energy storage system. As a result, large common-mode current emerges and endangers the safety of power devices. Firstly, this paper builds the simplified model of cascaded H-bridge converter and analyzes the common mode voltage. Then the common-mode current paths are analyzed and the peak value of common-mode current is estimated. The methods of common-mode current suppression for cascaded H-bridge battery energy storage system are discussed in the end. Simulation and experimental results verify the analysis.
陈 强, 李 睿, 高宁, 蔡旭, 陆志刚. 链式储能系统共模电流的分析及抑制[J]. 电工技术学报, 2016, 31(14): 104-111.
Chen Qiang, Li Rui, Gao Ning, Cai Xu, Lu Zhigang. Analysis and Suppression of Common-Mode Current for Storage System Based on Cascaded H-Bridge Converter. Transactions of China Electrotechnical Society, 2016, 31(14): 104-111.
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