Grid frequency regulation strategy considering individual driving demand of electric vehicle

Abstract

The precondition for electric vehicles (EVs) to be involved in the system frequency regulation (FR) is that the owner’s driving demand can be satisfied, which is the key factor in promoting vehicle owners to participate in system FR service. At present, many studies have proposed FR control strategy, but most of them are confined to the fleet level of EVs and ignore the individual level. And the individual demand of EV in FR process includes both satisfying the energy demand and reducing the harm to storage battery caused by the conversion between charge and discharge state. Accordingly, this paper firstly expounds the demand declaration strategy of EVs. Based on the declared information, the grouping strategy of EVs connected to the grid is proposed. Then the FR control strategy at the level of individual EV is elaborated. At last, the load frequency control (LFC) model considering the driving demand of EV is established. The simulation results show that the proposed control strategy can effectively satisfy the energy demand of individual EVs participating in FR, control the number of conversions between charging and discharging state, and achieve the aim of stabilizing system frequency fluctuation.