Research on mutual test method and strategy of bi-directional power grid connected invertert

In order to improve the utilization rate of grid connected inverter and expand its auxiliary service capacity for power grid, the demand of grid connected inverter supporting V2G, V2B, V2H and other technology applications is increasingly obvious. However, due to its detection technology has not yet carried out systematic research, if the existing detection technology is applied, it will not only follow the shortcomings of the current technology, but also abandon the advantages of bi-directional power control topology. In order to solve this problem, this paper proposes a test method and control strategy for multiple bi-directional power grid connected inverters: Taking two bi-directional power grid connected inverters as examples, the circuit topology of back-to-back mutual test is proposed, and its working mode is analyzed; PID control with coupling inner membrane control is introduced to improve the dynamic response ability; The MATLAB simulation model is built and verified. The results show that the proposed test method and control strategy can effectively realize the test of bi-directional charging facilities, and provide a certain reference for the corresponding industry.