Enhancing the DC Voltage Quality in EV Charging Station Employing SMES and SFCL Devices

The fast-response energy compensating feature from a superconducting magnetic energy storage (SMES) device is favored for suppressing instantaneous voltage fluctuations, while the self-triggering current limiting feature from a superconducting fault current limiter (SFCL) suits to suits to achieve automatic load protections in the electric vehicle (EV) charging stations. This paper investigates a new DC voltage quality enhancing scheme by using a combined superconducting power technology employing SMES and SFCL devices. Preliminary simulations demonstrate the feasibility of this SMES-SFCL-based voltage quality improver to avoid the voltage fluctuations during the EV load transients and suppress the fault current effectively during the short circuits simultaneously.