A new inverter compensation strategy based on adjusting dead-time on-line

This paper proposes a new dead-time compensation technique for minimizing current distortion of permanent magnet synchronous motor (PMSM). Conventional dead-time compensation techniques for space vector PWM (SVPWM) are based on the fact that inverter dead-time is fixed, and need current direction information to eliminate dead-time effects correctly. In this paper, a new method which independently adjusts each dead-time of three inverter legs on-line according to the value of corresponding phase current is developed. The new means leads the dead-time disturbance voltage vector to rotate synchronously with current vector and no longer depends on current direction. Furthermore, dead-time disturbance voltages in dq frame can be calculated using i_d and i_q while need no current direction knowledge. The experimental results validate that the new algorithm can minimize the phase current distortion.