Stability Analysis and Control of Hybrid Microgrid

This paper studies stability issues and system control for a hybrid microgrid with renewable power sources. Such study includes coefficient deduction, stability range calculation and combined control method implementation. After selecting system parameters, the global controller, PI double loop controller for DC system and proportional resonant controller for AC load are designed to ensure the nominal voltage and equal power sharing. This hybrid microgrid system can track DC bus reference voltage in 0.12s with steady state error smaller than 4%. In the meantime, AC side of the hybrid microgrid can reach stable AC voltage with a constant frequency of 50Hz.