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《Electric Machines and Control》 2010-02
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Performance analysis of parallel system using LCL filter inverter unit

KAN Jia-rong1,XIE Shao-jun2,LIU Ai-zhong3(1.Yancheng Institute of Technology,Yancheng 224051,China;2.Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;3.Emerson Network Power Co.,Ltd,Nanjing 210013,China)  
Parallel inverter system has high frequency harmonic loop current because of parameters difference between parallel units.It is difficult to restrain the high frequency circulating current using control methods because the bandwidth of system is lower than the frequency of circulating current.The causation of high frequency circulating current is analyzed and proposed using LCL filter substitute the LC filter.The difference of impedance characteristic between LC filter and LCL filter are compared and the closed loop output characteristics of two types of inverters are analyzed.The equivalent output impedances of two types of inverters are approximately equal to each other in low frequency and show great difference in high frequency by designing properly.The parallel system keeps rigid output characteristic and dinky high frequency loop current by using the inverter with LCL filter as parallel unit.The simulation and experimental results show the validity of the proposed method.
【CateGory Index】: TM464
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