何江涛,张代润.电压暂降时并网逆变器电流的VSG抑制技术研究[J].电测与仪表,2021,58(4):24-29. He Jiangtao,Zhang Dairun.Research on VSG suppression technology of grid-connected inverter current under Grid Voltage Sag[J].Electrical Measurement & Instrumentation,2021,58(4):24-29.
电压暂降时并网逆变器电流的VSG抑制技术研究
Research on VSG suppression technology of grid-connected inverter current under Grid Voltage Sag
Virtual Synchronous Generator (VSG) control technology can improve the grid-friendliness of distributed power supplies. However, as the grid voltage drops, the traditional VSG control will cause the current output of the inverter to be too large. Therefore, a VSG current suppression control method is proposed. Firstly, the detection and improvement of the voltage sag of the power grid are analyzed and improved. On this basis, the reference voltage calculated by the VSG is used to calculate the reference current, so that the VSG can realize the output current amplitude suppression of the inverter under various voltage sag conditions. The method has a simple structure and can realize current control under different fault conditions. The simulation results verify the correctness and effectiveness of the proposed control method.
