微电网并网逆变器逆向功率抑制策略研究

Study on the Reverse Power Suppression Strategy of Microgrid Grid-sided Inverter

针对微电网并网逆变器并网过程中,逆变器与大电网之间的阻抗关系导致的微电网并网功率逆向传输使得微电网直流侧电压升高的问题,采用自适应虚拟阻抗与变增益功率下垂控制相结合的控制策略对微电网逆向功率进行抑制,使得微电网直流侧电压保持稳定,并通过MATLAB/Simulink进行了相关仿真验证,仿真结果与理论分析一致,验证了控制策略的有效性。

In the process of grid-connected inverters of microgrids,the impedance relationship between the inverter and the large grid leads to the reverse transmission of grid-connected power of microgrids,which increases the voltage on the DC side of microgrids.The control strategy combining adaptive virtual impedance and variable gain power droop control was used to suppress the reverse power of the microgrid,so that the DC side voltage of the microgrid remained stable.The relevant simulation verification was carried out by MATLAB/Simulink,and the simulation results were consistent with the theoretical analysis,which verified the effectiveness of the control strategy.