Charging and Discharging Control Strategy of Electric Vehicle Grid Connected Under Clean Energy

Abstract

A control strategy for electric vehicle charging station under clean energy is proposed in this paper. Its core is to determine the operation mode of the charging station according to the maximum power output of the photovoltaic system and the state of charge of the energy storage battery. The system can realise the coordinated operation of photovoltaic power generation, energy storage system charging and discharging, charging station demand and grid connection. The bidirectional DC/DC converter at the energy storage end adopts voltage and current double closed loop control. In order to avoid frequent charging and discharging of storage battery, bus voltage layered control method is adopted. The experimental results show that the adopted control strategy can enable the electric vehicle charging station to switch effectively between various operation modes, which verify the effectiveness of the system control strategy.