Simulation Study of the Mitigation of Nonlinear Load Harmonics and Unbalanced Voltage Stabilization Using 3-Wires and 4-Wires UPQC

Abstract

This paper investigates and discusses the simulation for control and improvement of power quality for three phases balanced and unbalanced nonlinear loads using UPQC (unified power quality conditioner) as one of the FACTS controllers (flexible AC transmission system) in distribution systems. The power quality problems in electrical distribution system are voltage sag, swell, unbalance and harmonics in voltage and current waveforms. To get a clear sinusoidal waveform with suitable value and phase is very important. In this paper the 3-wires and 4-wires UPQC based are the proposed control techniques to mitigate the current harmonics, voltage sag and unbalance problems for three phases balanced and unbalanced nonlinear loads. The simulation will be done using Simulink.