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《Electric Machines and Control》 2011-05
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Study on control scheme for grid-connected inverter with LCL filter

DENG Xiang1,HU Xue-feng1,2,GONG Chun-ying1(1.College of Automation Engineering,Nanjing University of Aeronautics & Astronautics,Nanjing 210016,China;2.Key Laboratory of Power Electronics and Motion Control of Anhui,Anhui University of Technology,Ma'anshan 243002,China)  
Only single grid current closed loop is not sufficient for the stability of the grid-inverter with LCL filter.This paper proposed a dual-loop control strategy with grid current root-mean-square(RMS) and leg output current,where grid current RMS is out feedback loop,and leg output current is inner feedback loop.It verified the stability of system by using Routh-Hurwitz criterion,and system modeling and stability analysis were also presented.The proposed control scheme was verified by simulation results and experiments on a 1kVA grid-connected photovoltaic inverter based on DSP.The results show that the proposed scheme can ensure the stability of the system and the grid current performances,and achieve fast transient responses.
【Fund】: 国家重点基础研究发展计划(973计划)资助项目(2007CB210303)
【CateGory Index】: TM464
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