Common-Mode Voltage Mitigation Technique in Motor Drive Applications by Applying a Sampling-Time Adaptive Multi-Carrier PWM Method

Common-mode voltage (CMV) in electric drives causes leakage current causing consequently EMI problems, loss and reduction of their components' lifetime. Several solutions have been proposed which usually lead to higher cost because additional components are used. This paper is focused on the mitigation resulting CMV produced by operation VSD means a specifically designed PWM method. The proposal based analysis harmonic spectrum using Fourier analysis. achieved modifying time-shift displacement carriers each sampling time considering multi-carrier technique. method has evaluated down scaled experimental setup it easily implementable mostly off-the-shelf mid-range micro-controller control platforms.