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《Transactions of China Electrotechnical Society》 2005-10
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Analysis and Realization of DC-AC Inverter Parallel System Based on Active and Reactive Circulating-Current Control

Xiao Lan1 Chen Liangliang2 Li Rui3 Yan Yangguang1 (1. Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 2. Nanjing Automation Research Institute Nanjing 210003 China 3. Zhejiang University Hangzhou 310027 China)  
Traditional inverter parallel control strategy which adopts active and reactive circulating-current control evolved from the grid-connection theory of synchronous generator in electric power system. In order to realize load-sharing, it regulates the phase of the output voltage according to the output active power difference and regulates the output voltage magnitude according to the output reactive power difference. If this control strategy is applied to the voltage and current double closed-loop controlled inverter parallel system, it will result in the instability of system. This paper analyzes the reason of instability. The quantitative relationship between the output voltage phase, magnitude difference and the output power difference of the voltage and current double closed-loop controlled DC-AC inverter parallel system is given. Corresponding control strategy is proposed and realization scheme of parallel system is given. The experimental results verify the feasibility of the proposed control scheme.
【Fund】: 国家自然科学基金(50337030);; 航空科学基金(01F52032)资助项目。
【CateGory Index】: TM464
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