Electric locomotives on the horizon will integrate SiC inverters

promising quicker switching and lower losses than traditional setups. However

in addition to the steep rising edge

the inverter-fed motor drive system faces challenges such as high common-mode voltage (CMV) and high motor terminal surge voltage swing rate (dv/dt). To tackle these hurdles

this paper proposes a novel tailored traction control system for three-phase locomotive motors. This innovative strategy utilises near-state space vector pulse width modulation (NSVPWM)

selectively removing space vectors with high CMV to generate modulation signals. Complemented by a slew rate capacitor configuration

the aim is to reduce CMV while effectively suppressing motor-side voltage slew rate. To validate this approach

experimental waveforms from on-site inverter-fed motor drive systems have been analysed to derive high-frequency parameters of long-line cables and variable frequency motors to mimic real locomotive operating conditions better. Through experimental research and comparative simulations against traditional methods

this study reveals a significant 33.3% reduction in CMV compared to traditional systems. Furthermore

it achieves an impressive decrease in the rise/fall slope

down to 86.6%

while ensuring nearly zero electrical power consumption.