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

Abstract

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.