This paper analyzes a design of overvoltage suppression filter for SiC inverter systems with high-frequency cable modeling in long transmission lines. The SiC inverter systems operating with long transmission lines may experience overvoltage caused by voltage reflection, leading to insulation breakdown. The proposed method to address the problem of overvoltage occurring on long transmission lines involves connecting RLC filter at the end of the cable to reduce the overvoltage. The RLC filter are calculated by deriving the characteristic impedance using the parameters of the cable modeling. The validity of cable modeling and designing overvoltage suppression filter is verified through simulations and experimental results. Additional experimental results and deep analysis under various conditions will be added in the final paper.
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