The Improved Control Method of Parallel Microgrid Inverters

Abstract The parallel of inverters is inevitable in the operation distributed generation with a Microgrid. However, due to difference line impedance between each inverter and public AC bus microgrid, m available control method insufficient overcome disadvantages such as unbalancing distribution power, large circulating current, poor dynamic characteristics, etc., especially when large. To conquer above problems, paper proposed an improved droop strategy, which differential module adapted improve response. Further, modified adaptive virtual resistance proposed, so that system can maintain high response speed, stability, robustness. These effectively benefit power sharing circulation suppression while ensuring excellent characteristics system. Finally, effectiveness verified by simulation results.