Frequency control in distribution feeders based on bidirectional V2G converter for EV

Electric vehicles (EV) could participate not only in the peak load shifting of power, but also in the frequency regulation of distribution system based on the technology of Vehicle-to-Grid (V2G). Through the transmission of active power between EV's battery and distribution network controlled by bidirectional V2G converter, primary frequency regulation could be achieved locally. In this paper, a two stage V2G converter and relevant control strategy is designed advanced. Then based on the bidirectional V2G converter, primary frequency regulation droop control is introduced to improve previous control strategy. Droop controller designed from EV's droop curve is used to change frequency deviation in distribution into active power deviation, and consequently the value and direction of active power transmitted by V2G converter is adjusted to regulate the frequency. Finally, simulation results verify the feasibility of the droop control for EV and the frequency deviation could be regulated back to acceptable range by V2G converter in distribution feeders.