Around microgrid with PV and energy storage system, this paper adopts a module-level configuration scheme and proposes coordinated control strategy to further release the potential of PV power generation and promote the efficient operation of energy storage unit. Firstly, aiming at the ‘barrel effect’ caused by PV module mismatch and low efficiency of energy storage converter, the module-level PV power optimizer and the energy storage partial power converter are configured respectively to maximize the utilization of solar energy and electrical energy. Secondly, the multi_x0002_mode switching of PV array and energy storage unit under on/off-grid conditions is discussed, and a coordinated control strategy of microgrid with PV and energy storage system is proposed to realize the smooth switching and power automatic distribution of each unit in different control modes. Finally, a 30kW microgrid with PV and energy storage system simulation platform is built by using Matlab/Simulink to verify the feasibility and effectiveness of the proposed coordinated control strategy.
Keywords PV power optimizer, energy storage partial power converter, power balance, coordinated control strategy