Control Strategy of Microgrid Switching Station based on B2G Mode of Fully Charged Battery

Abstract After the electric vehicle exchange station is connected to the microgrid, the battery in the exchange station can be used to stabilize the output fluctuation of renewable energy or provide auxiliary services such as frequency modulation and rotary standby through battery to grid (B2G), so as to reduce the construction cost of microgrid and improve the operation profit of the power station. In this context, the following work has been done: (1) A scheme of battery swapping to participate in B2G service is proposed, which solves the problems of insufficient available power and difficult charging plan when selecting batteries to be charged and batteries being charged; (2) Considering the service reliability of power exchange station and the power fluctuation of tie line interaction, a day ahead charging scheme is proposed and the operation cost of the power station is reduced by making the plan and scheduling the battery within a day; (3) The effectiveness of the proposed control strategy is verified by a simulation example. The control strategy of battery scheduling effectively participates in the B2G service of microgrid, which improves the power supply reliability of microgrid and gains some benefits.