Analytical investigation of induction motor drive under DC-link voltage ripple in voltage source inverter.

Abstract

Analytical analysis and mathematical model of ripple components of the DC-link voltage of three-phase voltage source inverter and its influence on an induction motor drive both in time and frequency domain are presented in this paper. The analytical expressions for the voltage and current space-vectors as a function of the DC-link voltage pulsation are derived. From the current space vectors the torque behavior is estimated again as a function of DC-link voltage pulsation. The proposed analytical method is based on the mixed p-z approach enabling presentation of the results in closed-form.