Assessment of operation performance of power converters with low frequency PWM drive issues and field weakening

摘要

harmonics. The dv/dt reduction contributes to minimizing problems on motors windings, damaged insulation and electrostatic currents on the viscous fluid of bearings that cause motors degradation. Another concern is the need to avoid currents asymmetries that can induce pulsating torques in the machine, undesired DC voltages per phase and displacement of neutral voltage on three-phase loads, which in turn can influence common-mode current flows. The PD-PWM, PODPWM modulation techniques and the selective harmonic elimination, SHE-PWM, are presented and evaluated, then compared through simulations and experimental results.