Abstract:This paper designs a bi-level dispatch strategy for an off-grid AC microgrid, namely, economic optimization for day-ahead scheduling and real-time dispatch for stable operation within the day. In the day-ahead stage, the objective is the economical operation of the microgrid, utilizing whole life cycle theory to establish an economic model, and taking into account the impact of the battery’s State of Charge (SOC) on its lifespan. For the day-of operation, the goal is supply stability, fully considering the potential system collapse due to forecast errors and using the energy storage’s PQ source to real-time correct power deviations of VF sources, thus improving the working state of storage VF sources. Through simulation examples, a comprehensive optimization dispatch scheme for the economic and stable operation of the microgrid is obtained, verifying the effectiveness and rationality of the strategy.