Paper Details

This paper presents a novel three-dimensional space vector PWM method for two-phase four-leg voltagesource inverter and its realization for asymmetrical two-phase induction motor drive. A general model suitable forIndirect Rotor-Field-Oriented Control (IRFOC) system of the two-phase induction machines used in this technique. Theasymmetry due to unequal resistances and inductances of auxiliary and main windings is taken care of by introducing anappropriated factor k. In the mathematical model the machine main and auxiliary winding are represented in thestationary reference frame. The two phase voltages are obtained by tapping the output from terminal pairs ab and cd.The three dimensional space vector modulation without null vector is used to generate the switching signals for theinverter. Unlike the conventional Space Vector Modulation (SVM) technique, in this method the NULL vectors areeliminated and the gating signals are generated using only the non-zero active vectors. Due to this the number oftransitions in a switching period is reduced. This technique reduces the switching losses in the inverter. The simulationresults obtained validate the algorithm used.

Dr. Heli Amit Shah, “A Modified 3 D Space Vector based PWM Method for Four-Leg VSI Fed Asymmetrical Two-Phase Induction Motor drive using Vector Control”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 6, Issue 8, pp. 140-148, August 2019.