Abstract：This paper discusses the DC side electromagnetic interference (EMI) filter design methodology for photovoltaic inverter System. It conducted an analysis of noise source and propagation path impedances of photovoltaic inverter system. A DC side filter design method is proposed based on the impedance mismatching between the EMI filter impedances and noise source/load impedances. And four different filter topologies are studied and compared. Simulation and experimental results give a firm support to the proposed method. Lastly, it discussed the experimental results comparing with the simulation results and verified the correctness of theoretical analysis.
[1] Lopez O, Freijedo F D, et al. Eliminating ground current in a transformerless photovoltaic appli- cation[J]. IEEE Transactions on Energy Conversion, 2010, 25(1): 140-147. [2] Chen P S, Lai Y S. Effective EMI Filter design method for three-phase inverter based upon software noise separation[C]//International Power Electronics Conference, Sapporo, 2010: 914-919. [3] Zhang Xunning, Boroyevich D, Mattavelli P. EMI filter design and optimization for both AC and DC side in a DC-fed motor drive system[C]//Twenty- Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), Long Beach, CA, 2013: 17-21. [4] Yu Wensong, Lai Jih-Sheng, Qian Hao, et al. High-efficiency inverter with H6 type configuration for photovoltaic non-isolated AC module appli- cations[C]//Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), Palm Springs, CA, 2010: 1056-1061. [5] Shobana S, Padmapriya J. Improved high efficiency inverter with H6 type configuration to eliminate CMLC for PV System[C]//International Journal of Advances in Electrical and Electronics Engineering, 2013: 49-58. [6] Cavalcanti M C, de Oliveira K C, de Farias A M, et al. Modulation techniques to eliminate leakage currents in transformerless three-phase photovoltaic systems[J]. IEEE Transactions on Industrial Electronics, 2010, 57(4): 1360-1368. [7] Mathe L, Sera D, Kerekes T, et al. High flexibility and low cost digital implementation for modern PWM strategies[C]//37th Annual Conference on IEEE Indu- strial Electronics Society, Melbourne, VIC, 2011: 1366-1371. [8] 刘正, 查晓明, 段善旭. 三相并网光伏逆变器LCL滤波器的参数设计与研究[J]. 电工技术学报, 2010, 25(3): 110-116. Liu Zheng, Zha Xiaoming, Duan Shanxu. Design and research on parameter of LCL filter in three-phase grid-connected inverter[J]. Transactions of China Electrotechnical Society, 2010, 25(3): 110-116. [9] 武健, 何娜, 徐殿国. 三相并联有源滤波器输出滤波器设计方法研究[J]. 电力电子技术, 2004, 38(6): 16-19. Wu Jian, He Na, Xu Dianguo. Study on output filter in parallel active power filter[J]. Power Electronics, 2004, 38(6): 16-19. [10] Shih F Y, Chen Y T, Wu Y P, et al. A procedure for designing EMI filters for AC line applications[J]. IEEE Transactions Power Electronics, 1996, 11(1): 170-181.
2015, Vol. 30 
