Distribution Network Power Quality and Potential Impact on Electric Vehicle Charging

This paper investigates power quality (PQ) issues in a residential distribution network in Doha and evaluates their implications for charging electric vehicles (EVs). EV chargers, being power electronic-based devices, are highly sensitive to PQ disturbances such as voltage dips, voltage swells, and voltage unbalances. Using one year of historical data collected from a phasor measurement unit (PMU) monitoring system, the study identifies and classifies PQ events, including 154 voltage limit violations, 122 voltage unbalance events, 12 voltage dips, and 2 voltage swells. These disturbances frequently exceed the tolerance limits of Level 1 and Level 2 chargers, posing risks of charging interruptions, reduced efficiency, and potential equipment damage. The findings underscore the need for systematic PQ assessments before charger deployment, with corrective actions such as voltage regulation or smart charging strategies recommended to mitigate adverse impacts. This study provides the first Qatar-specific evidence linking existing PQ conditions to EV charging reliability, supporting grid operators and policymakers in planning robust charging infrastructure.