Abstract
The electric vehicle inverter is the core component of the electric vehicle and has very high requirements on reliability. Silicon carbide (SiC) devices have the advantages of high temperature resistance, high voltage resistance, and low loss, and have been widely used in automotive inverters. Lifetime assessment is an important means to improve the reliability of electric vehicle inverters. It is of great significance to evaluate the lifetime of SiC devices for automotive inverters. In this paper, the vehicle inverter using SiC device is taken as the research object, and the lifetime of SiC device and its influencing factors under vector control and model prediction control are evaluated and studied respectively. The electrothermal simulation model of the electric drive system of electric vehicles under actual working conditions is constructed in the Matlab and Plecs co-simulation platform. The following two control strategies are compared and analyzed in detail on the influence of junction temperature and lifetime of SiC devices, which provides an analysis basis for the assessment of the control performance and thermal performance of electric vehicle SiC inverters under the selection of motor control strategies.
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