Design and Performance Evaluation of Fault Ride‐Through Capability on 30‐kW Electric Vehicle Charging Station Under Critical Voltage Conditions

The increasing penetration of electric vehicle charging stations (EVCSs) in distribution networks makes them highly vulnerable to grid disturbances such as voltage sags caused by line and ground faults. This article investigates the impact of severe undervoltage conditions on a widely deployed 30‐kW EVCS and proposes a dynamic voltage restorer (DVR)–based fault ride‐through capability (FRTC) to enhance system resilience. The EVCS is supplied from a three‐phase 400‐V distribution grid and consists of a three‐phase closed‐loop controlled rectifier maintaining a 700‐V dc‐link voltage, followed by a closed‐loop buck converter for charging a 30‐kW Li‐ion battery pack rated at 400 V, 70 Ah, and 1C charging rate. The system performance is evaluated under 30%, 60%, and 90% balanced voltage sag conditions to assess their impact on dc‐link regulation and battery parameters, including charging current, terminal voltage, and state of charge. Results show that deep voltage sags significantly disturb dc‐link stability and degrade charging performance in a conventional EVCS. To address this issue, a three‐phase two‐level inverter‐based DVR is integrated at the grid interface to provide effective voltage compensation. Proposed system is modeled and simulated in the MATLAB/Simulink platform and the obtained results is validated using real‐time hardware‐in‐the‐loop test with the help of OPAL‐RT. Comparative analysis demonstrates that the proposed FRTC strategy successfully mitigates voltage sag effects, maintains stable dc‐link voltage, preserves controlled battery charging, and significantly improves overall power quality, thereby enhancing the operational reliability of the 30‐kW EVCS under severe grid disturbances.