In order to study the harmonics of EV charging stations based on V2G technology, this paper proposed a simulation model considering the structure of the bi-directional charger and the control strategy. To study the variation of THD, the bi-directional charger, the charging station and the traditional 6-pulse rectifier for a contrastive analysis has been made. The author has focused on the charging process and the number of chargers which is in the constant current and constant voltage mode, and then the two factors was combined to make a unified analysis. In the end, a comparative study for bidirectional chargers and traditional chargers has been conducted. The simulation results shows that when in constant voltage charging phase, the THD value increases significantly, with the increasing number of chargers, the THD value tends to stabilize, and if the charging power is higher, the harmonics will be smaller.
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