Fault Identification Testing Methods for a Commercial Traction Inverter

Abstract:
As electric traction drive systems continue to improve in power density and performance, a method for detecting failures and increasing the overall reliability of the system’s power control unit is essential. This article proposes a test methodology for fault identification of a commercially available 55-kW traction inverter. The objective of the proposed test method is to accelerate device failure in an environment that replicates realistic driving conditions. This paper details the control strategy, test procedure, and measurement techniques for the prognostic testing of a commercial inverter, while demonstrating the practical need for fault identification testing in the electric vehicle industry.