Calculation of harmonic suppression and reactive power compensation device's capacity configuration in electric vehicle charging Stations

The high-power rectifiers in electric vehicle (EV) charging stations may bring serious harmonic pollution to power grid. For different types of EV charging stations, one of the issues concerned in the engineering is that how much capacity of the active power filter (APF) and reactive power compensator should be configured. Previous research has given preliminary configuration principle and calculation formula of the APF's capacity. On this basis, based on the configuration parameters of typical EV chargers and charging stations, firstly, this paper gets the maximum harmonic current and power factor values in the output voltage range of the different EV chargers by doing lots of simulations. Secondly, the capacity of APF and reactive power compensator needed for single EV charger is calculated. Thirdly, the mathematical formula of APF's configuration capacity for the whole EV charging station is presented. Finally, the configuration capacity's calculation results of APF and reactive power compensator for different EV charging stations are given.

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