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《Transactions of China Electrotechnical Society》 2014-02
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Control Strategies of High-Voltage Microgrid for Operation Modes Switching

Zhang Mingrui;Du Zhichao;Wang Shaobo;Sun Hua;Tongji University;Shanghai Environment Protection Complete Engineering Co., Ltd.;Central Academe Shanghai Electric Group Co., Ltd.;  
This paper puts forward a novel voltage mode control strategy to realize the smooth transition between the grid-connected and islanded operation mode of future renewable electric energy delivery and management(FREEDM). Because the inverters are controlled to work as voltage sources all the time, the switch of control strategy is avoided. And the improved angle droop control strategy is used instead of conventional frequency droop control to set frequency free from the change of output, which reduces the difficulty of mode transition. The power deviation is added to the droop control block at the grid-connected mode to realize the constant output power control. The synchronization is ensured by employing the redesigned controller, and the integrator is utilized to reduce the impact when separated from conventional grid, thus the smooth transition of operation modes is achieved. Simulation and analysis show the proposed control strategy can realize fast synchronization, reduce the impact current of point of common coupling(PCC) during the mode transition period, steady the voltage and frequency of the microgrid, and also inhibit circulating current effectively.
【Fund】: 上海市自然科学基金(13ZR1444400);; 上海市科委重大专项(13DZ1200403);; 中央高校基本科研业务费专项资金(0800219169)资助项目
【CateGory Index】: TM732
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