A Pre-Synchronization,Multiple Loops Control,and Unbalanced Load Control Strategies for Three-Phase Four-Leg Virtual Synchronous Generator
Gu Binshi1, Wang Jianhua1, Luo Fangfang1, Ji Zhendong2, Lü Zhipeng3, Gu Wei1, Wang Tao4
1. Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment School of Electrical Engineering Southeast University Nanjing 210096 China; 2. School of Automation Nanjing University of Science and Technology Nanjing 210094 China; 3. China Electric Power Research Institute Beijing 100192 China; 4. Samil Power Co. Ltd Suqian 223800 China
Abstract This paper designs a multiple loops control strategy for three-phase four-leg virtual synchronous generator (VSG). The decoupling control of power is used to make inverter simulate the primary frequency modulation, primary voltage modulation, inertia and excitation characteristics of synchronous generator. To improve the dynamic regulation performance of micro-grid, voltage and current double loop is cascaded after the power loop. To connect the grid smoothly, a synchronization control strategy is adopted to track the voltage frequency, phase and amplitude of grid. A variable frequency adaptive resonance control strategy is used to suppress unbalanced voltage and frequency fluctuation caused by unbalanced load. The simulation and experiments validate the effectiveness of the control strategy.
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2017, Vol. 32 
