Research on Grid-Connected/Islanded Control Strategy of PV and Battery Storage Systems as Emergency Power Supply of Pumping Storage Power Station

In order to solve the problem of the insufficient reliability of diesel engine as the emergency power supply of pumped storage power station, a grid-connected/islanded control strategy of PV and battery storage systems as the emergency power supply of pumped storage power station is proposed. To begin with, the control strategies of different operation modes of the optical storage system are introduced. In the grid-connected operation mode, PQ control strategy is used to coordinate the output of PV and battery storage to meet the station power load demand. When faults occur in the grid, the PV and battery storage systems switch to islanded operation mode. At this time, the battery storage system adopts V / F control to maintain the stability of system voltage and frequency. The PV system still uses PQ control, and the two coordinate to supply power for the load. The time domain simulation model of PV and battery storage systems is established and the control strategy of the converter is simulated. The simulation results verify the effectiveness of the proposed grid-connected/islanded control strategy.