부산대학교 도서관

To meet the demand of energy transformation, a large number of photovoltaic system and energy storage are widely connected to the distribution network. This paper proposes a seamless closed-loop load transfer scheme assisted by photovoltaic-energy storage joint system. This scheme is implemented by using photovoltaic energy storage to jointly carry the load for a short time, and adjusting the inverter voltage and current synchronization with the standby power grid. The simulation including amplitude difference and phase angle difference is carried out on the MATLAB/Simulink simulation platform. The simulation show that this scheme can eliminate the phase angle difference and amplitude difference on both sides of the contact switch, improve the safety of the loop closing operation, and reduce the impact current and circulating current of the loop closing on the distribution network.