Mitigation of Motor Overvoltage in SiC-Based Drives Using Soft-Switching Voltage Slew-Rate ($dv/dt$) Profiling

In silicon carbide (SiC) device based motor drives, the high-voltage slew-rate ( dv / xmlns:xlink="http://www.w3.org/1999/xlink">dt ) associated with fast-switching transitions results in excessive overvoltage, due to reflected wave phenomenon, which increases winding insulation stress and causes premature failure while raising electromagnetic interference (EMI) problems. This article proposes a soft-switching voltage profiling approach mitigate overvoltage SiC-based cable-fed drives. The proposed optimizes rise/fall time of output according cable length, without altering switching speed SiC devices. Since increasing using conventional approaches, such as gate resistance, an increased power loss, is implemented inverter. optimum that can significantly derived frequency- time-domain analysis. auxiliary resonant commutated pole inverter (ARCPI) adopted example experimentally verify for mitigation. analysis experimental show fully mitigated when set antiresonance period, i.e., four times transmission along cable. Furthermore, ARCPI reduces loss improves EMI performance at high-frequency region, compared hard-switching converter. Specifically, maximum efficiency about 99%.