| Title |
Comparison of RLC and LC Filters for Overvoltage Suppression in SiC Inverter Systems with Long Cables |
| Authors |
Yun-Jin Lee ; Kyo-Beum Lee |
| DOI |
https://doi.org/10.5207/JIEIE.2026.40.2.85 |
| Keywords |
Overvoltage mitigation method; Passive filter; SiC module; Transmission line modeling |
| Abstract |
This paper presents a comparison of RLC and LC filters for overvoltage suppression in SiC inverter systems with long cables. SiC-based inverter systems enable high power density due to their fast switching characteristics; however, when long motor cables are employed, voltage reflection phenomena may give rise to overvoltage issues. Such overvoltage may accelerate insulation degradation at the motor terminals and adversely affect overall system reliability, thus necessitating effective mitigation measures. The overvoltage characteristics of SiC inverter systems with long cables are investigated, and the mitigation performance of LC and RLC output filters is comparatively evaluated. Cable modeling is carried out and utilized in the filter design process to account for the high-frequency behavior of long cables. The RLC filter incorporating damping elements is shown to be effective in suppressing oscillatory overvoltage components. The validity of the filter design to suppress overvoltage by reducing a dv/dt is verified through simulation results. |