The Active and Reactive Power Control of Virtual Synchronous Generator Based on Adaptive Mode Switching
Shi Rongliang1, Zhang Xing1, Xu Haizhen1, Liu Fang1, Cao Wei2
1. Institute of Electrical and Automation Engineering Hefei University of Technology Hefei 230009 China; 2. Sungrow Power Supply Co. Ltd Hefei 230088 China
Abstract：The control strategy of conventional energy storage converter wireless virtual synchronous generator (VSG) control based on “power-voltage-current” closed loop is widely used. But the micorgrid voltage would significantly affect the active and reactive output power limits in this strategy. This paper analyzes the effectiveness of two existing solutions. One is the improved droop control method by dynamically adjusting the droop coefficients, which has limited regulating range. The other is the translational droop curve control method. Although this method has an excellent performance, it may cause the output power of VSG to fluctuate and further lead the system to be unstable. The paper proposes an improved VSG control strategy based on adaptive mode switching. Herein, both the additional phase and current instructions are real-time tracked, to realize smooth transition between PQ control current-source mode and VSG control voltage-source mode. Finally, the simulation and experimental platforms are established. The results verify the effectiveness of the proposed strategy.
石荣亮, 张兴, 徐海珍, 刘芳, 曹伟. 基于自适应模式切换的虚拟同步发电机功率控制策略[J]. 电工技术学报, 2017, 32(12): 127-137.
Shi Rongliang, Zhang Xing, Xu Haizhen, Liu Fang, Cao Wei. The Active and Reactive Power Control of Virtual Synchronous Generator Based on Adaptive Mode Switching. Transactions of China Electrotechnical Society, 2017, 32(12): 127-137.
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2017, Vol. 32 
