In induction motor-based traction drives for electric vehicles, long inverter-to-motor cables can potentially exhibit LC filter characteristics that induce resonance oscillations in voltage and current waveforms. These oscillations increase harmonic content, reducing motor efficiency and lifespan. While LC filters are sometimes intentionally added to ensure sinusoidal waveforms, they can also exacerbate resonance issues. Active damping (AD) control strategies offer a more efficient solution by selectively targeting resonant frequencies. Although various active damping methods for series and parallel resonances exist, they are often studied separately and rarely evaluated under critical conditions. This work focuses on a practical but often overlooked case of resonance, where the inverter’s switching frequency is close to the LC circuit’s natural frequency. A detailed comparison and evaluation of series and parallel AD methods are presented for this near-resonance condition. The findings offer practical guidance for selecting damping strategies to enhance the stability and performance of EV drive systems.
