Input/Output Current and Voltage Harmonics Analysis of Variable Frequency Drive connected Induction Machine

I. A. SOOMRO, A. M. SOOMRO, A. S. LARIK, S. M. JISKANI

Abstract


There are several ways used to control the speed of motors depending on their applications. One of the commonly used system for speed control of motors is Variable Frequency Drive (VFD) that works on principle of constant V/Hz ratio. VFD comprises of non-linear switches and usage of non-linear load leads to the generation of harmonics which affects the power quality as well as performance of devices like motors and controllers etc. Harmonic measurement and analysis thus becomes very important task in context with increasing power quality. This paper describes the working of Variable Frequency Drive (VFD) and presents the result set for Total Harmonic Distortion (THD) produced through VFD whereas the output frequency changes from 10Hz to 100Hz in 10 equal steps. The results can be used further for a potential harmonic filter design to reduce harmonics being injected back to the power distribution network.

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