Investigation of relationships of adjustable speed drive (ASD) and type of voltage source on harmonic characteristics

Abstract

This paper discussed about relationship of ASD and types of voltage source on harmonic characteristics. Usually, the voltage source is sinusoidal. But in actually, the condition of the load is it has voltage sources through the elements where the output voltage of element as input to load is did not pure sinusoidal, for example at Point at Commom Coupling (PCC) between transformer and linear load and nonlinear load. The research has done with Schhafner Power Quality Analyzer. The research was focused to Cress Factor (C.F.), Total Harmonic Distortion (THD), and harmonic energy losses cost from measurement, where load is the induction motor with and without ASD. As voltage source in this research are sine wave, square wave and combinations of 3rd, 5th and 7th harmonic order like harmonic 35, harmonic 37, and harmonic 57.