Modular field testing system for the electric vehicle off‐board charger

Abstract

The massive installation and deployment of electric vehicle (EV) charging infrastructures requires designing efficient and convenient testing tools for the field testing. This paper presents a novel testing system for the EV off-board charger, in an application such as field testing and maintenance. The authors discuss the design theory and hardware implementation of the system in first. Two typical charger testing scenarios using the proposed tester are discussed. In addition, the modular structure of the system provides the user with a high degree of flexibility, which allows them to configure their own testing systems according to their applications. Three digital processing approaches for constraining high-frequency components and harmonics are introduced. The authors demonstrate that the digitalised traditional filter has an overwhelming advantage than the statistical filters in the experimental results. They also validate the function of the proposed testing system with a DC 60 kW charger, by finishing testing items such as the regulation accuracy, current imbalance and extreme temperature testing. Finally, they present a comparative study of recent EV charger testing systems.