Abstract When the master-slave microgrid switches from the grid-connected operation mode to the island operation mode, the main converter and its control strategy are switched at this time. With the unintentional islanding of the microgrid, there is an uncontrollable voltage phenomenon during islanding detection, causing undervoltage or overvoltage, which endangers the overall microgrid stability and safety. Aiming at this problem, a microgrid control strategy is proposed in this paper: during grid-connected operation, both the grid-connected converter and the energy storage converter adopt droop control to jointly control the bus voltage stability, while also ensuring the power balance between the microgrid and the public grid. The grid-connected converter exits operation after islanding, and the energy storage converter becomes the main converter to stabilize the bus voltage while maintaining the power balance of the load. The output of the converter in this method has continuity, which can well realize the seamless switching of microgrid from grid-connected to island operation. A simulation model of the solar-storage microgrid was built in PSCAD. The simulation verifications of its grid-connected and island mode and seamless switching control prove the effectiveness of the control strategy proposed in this paper.