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《Proceedings of the CSEE》 2011-01
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A Modular Grid-Connected Photovoltaic Generation System

ZHANG Li1,SUN Kai2,FENG Lanlan1,WU Tianjin1,XING Yan1,GE Hongjuan1(1.College of Automation Engineering,Nanjing University of Aeronautics & Astronautics,Nanjing 210016,Jiangsu Province,China;2.Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)  
A modularized grid-connected photovoltaic generation system was proposed,which consists of modular DC/DC converters and modular inverters.The output of DC/DC converter and the input of inverter share the DC bus.The AC current coupling in parallel operation was investigated.A current decoupling control was proposed and implemented by regulating the currents through both the fire-wire and neutral-wire filter inductors respectively.A control for the system efficiency(especially the light load efficiency) optimization for the photovoltaic generation system was proposed by utilizing the tolerance of the control parameters.Only one of the modular inverters is operating with non-full load and the others are operating either with full-load or at stand-by.A prototype system was built with both the steady-state and dynamic experimental results given,to verify the feasibility of the proposed system and the effectiveness of the control strategies.
【Fund】: 江苏省科技成果转化基金项目(BA2008001)~~
【CateGory Index】: TM615
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