Analysis of three phases four wire hysteresis current controller for unbalanced loads like DC motor and diode rectifier on different phases using DSTATCOM

Abstract

Unbalanced and distorted loads create lot of disturbances in source voltages and other neighboring loads. The loads like light or computers are sensitive, they may flicker or cause heat internally and may loses its life earlier. For controlling unbalanced loads, custom power devices like DSTATCOM, DVR and UPQC are most widely used. In this analysis, in three phases, three different loads like resistor load, diode rectifier load and DC motor load is placed. The resistor load gives normal voltage and current, diode rectifier load voltage and current which will distort voltage waveform and DC motor load will distort both voltage and current waveforms. In the analysis, these loads are considered with different power ratings, so unbalanced voltages and currents are produced. In this paper, DSTATCOM with hysteresis controller is used for compensating unbalanced voltages and to reduce total harmonic distortion (THD) in source voltage and current.