Control Strategy of Discharged Power with Bidirectional Battery Charger for EVs to Prevent Reverse Power Flow to Utility Grid

抄録

This study proposes a decision strategy for the power discharged from batteries in electric vehicles (EVs) with a bidirectional battery charger (BBC) in single-phase three-wire distribution feeders (SPTWDFs), where reverse power flow to the utility grid is perfectly prevented. The active power consumed by the domestic consumer connected to the BBC for EVs is calculated using the detected load currents. The newly proposed control strategy determines the reference value for the bidirectional DC-DC converter in the BBC with the active power derived from the detected load currents. The basic principle of the proposed control strategy of the discharged power from the battery in EVs is discussed in detail and confirmed by digital computer simulation using a power electronics simulator (PSIM). The simulation results show that the amplitudes of the source-side currents flowing to the utility grid, are almost zero with the proposed control strategy. Therefore, it is concluded that the reverse power flow to the utility grid is perfectly prevented by the proposed control strategy.