| Abstract |
Switched inverters generate fast rates of change of common-mode voltage and are an unwanted sideeffectin variable speed drive systems operated with PWM inverters. Whilst techniques have beenreported that theoretically eliminate the common-more voltage, when the dead-time effects and thepractical transient performance of semiconductors are considered, a common-mode voltage is stillgenerated, even though these proposed techniques sacrifice dc-link utilization and switching loss. Inthis paper, a switching strategy is proposed for the three-level five-phase neutral-point-clampedinverter, which reduces the common-mode voltage as far practically possible and eliminates vectors inthe d2q2 plane. The proposed method maintains the same linear modulation range as the conventionalspace vector modulation technique but utilises fewer switching actions in one carrier period. Moreover,its complexity is reduced lowering the computational overhead. The proposed method is verified inboth simulation and experiments on a prototype of five-phase neutral-point-clamped inverter. |
