THD Analysis of Induction Motor Using SolidState Switching Devices

Abstract

In this paper soft starting of asynchronous motor via two different power electronics devices is obtained as well as this paper give comparative performance of asynchronous motor for same firing angle applying on two different power electronics devices first one is thyristor and second one is insulated gate bipolar transistor. This paper employ the topology in order to minimizing the adverse effects of high inrush currents in induction motors starting torque transients with the help of electronically controlled soft-starting voltages utilizing silicon-controlled rectifiers (SCRs). In this paper fundamental frequency and THD is calculated in both for R-L load and asynchronous motor by various firing angles, and influence of load variations in terms of firing angle has been investigated for Thyristor and IGBT (Insulated Gate Bipolar Transistor).