Smart charger for electric vehicles on single-phase three-wire distribution feeders with constant dc-capacitor voltage control under multiple household customers

This paper address compensation performance for the previously proposed smart charger of Electric Vehicles (EVs) with constant dc-capacitor voltage control under multiple household customers. No calculation blocks of the reactive and unbalanced active components on the load side are used in the previously proposed control strategy. The smart charger with the constant dc-capacitor voltage control based strategy may be overloaded under multiple household customers on the secondary side of the pole-mounted distribution transformer. The instantaneous power flow into the three-leg inverter, which performs the smart charger, is discussed in detail. The instantaneous power flow into the smart charger show that the balanced source currents with a power factor of 0.9 are obtained on the source side of only one household customer that the smart charger is connected, whereas unbalanced load currents conditions are remained on the other household customers. Thus, the smart charger is not over loaded. Simulation results demonstrate that balanced source currents with a power factor of 0.9, which is acceptable value in Japanese regulation, are obtained on the source side of only one household customer while unbalanced load conditions are remained on the other household customers.