Impact of Background Voltage Harmonic Mitigation Techniques on Coupled Frequencies in VSC-Based EV Fast Charging

In active front end-based EV fast charging stations, background voltage harmonics produce current not only at the frequencies of the distorted voltage, but also at other coupled frequencies. Various mitigation techniques, such as increasing inner control loop gain, grid voltage feedforward, and selective harmonic compensation, have been adopted in industry to reduce the emissions originating from distorted background voltage. However, although …