Analysis of Emitted Electromagnetic Interference of DC Electric Vehicle Supply Equipment

High-power electric vehicle chargers are being installed on a large scale. These devices use converters that convert AC power to DC power. They generate distortion in the supraharmonic spectrum which can cause varying issues. This research measured and characterized the emission of three high-power electric vehicle chargers under different operating conditions using various analysis methods. The chargers are also tested against proposed emission limits. The results varied significantly between EVSEs. Results show a distortion’s amplitude and frequency can change over time. These findings can be used when developing feasible standards for the regulatory gap.