Coordinated control of independent DC micro-grid based on fuzzy-PI algorithm

Abstract

The study on the stability of DC bus voltage is one of the key issues for researching independent DC microgrid. This paper has studied the independent DC microgrid with photovoltaic and energy-storage systems. The variable step incremental conductance method was taken to realise maximum power point tracking (MPPT). The self-adaptive Fuzzy-PI controller was designed to optimise the traditional double closed-loop control strategy. The energy management system was built to achieve coordinated control of the independent DC microgrid. The simulation results show that the improved strategy can get better robustness and system performance comparing with the traditional PI method.