A two-phase SVPWM strategy for dead-time compensation

摘要

A two-phase space vector PWM (SVPWM) strategy is proposed. By properly selecting the no-switching phase in each PWM cycle, the zero current clamping phenomenon can be eliminated, and the dead-time effect can be well compensated even at zero-current periods. Two modes of the strategy are presented. RTHD mode has better harmonic distortion characteristics. In RCMV mode, the common-mode voltage (CMV), which leads to the premature deterioration of motor bearings, is reduced to 1/3 of the traditional three-phase PWM method, and the switching loss is also lower. Just a little software is needed for implementing the proposed strategy and the strategy can be widely applied. Experimental results are presented to fully support the above-mentioned claims.