Power Distribution Strategy & Real-time Simulation for VSG-controlled Parallel PV/Battery Microgrid Using RT-LAB

In current inverters of microgrids controlled by virtual synchronous generator (VSG) method, the characteristics of the DC sources are usually ignored which leads its lower utilization. In this paper, a power distribution strategy is proposed for an islanded microgrid consisting of parallel PV (photovoltaic)/Battery-VSG units to maximize the utilization of PV generation. The proposed control strategy is verified by building a real-time RT-LAB simulation model with second control for the microgrid with two parallel PV/Battery-VSG units. The simulation results show that this strategy can guarantee the maximize use of PV unit by dynamically adjusting inverter control parameters. In addition, the real-time simulation platform based on RT-LAB can improve hardware solution ability and provide faster method to verify the effectiveness of control algorithms for the complicated power electronic systems like microgrids than by using MATLAB.