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| 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 |
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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.
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Received: 07 May 2014
Published: 28 July 2016
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2016, Vol. 31 
