Applications of D-STATCOM for Power Quality Improvement in Distribution System

Abstract

FACTS use Power Electronic devices and methods to control the high-voltage side of the network for improving the power flow. Custom Power is for low-voltage distribution, and improving the poor power quality and reliability of supply affecting factories, offices and homes. Power quality and Reliability are becoming important issues for critical and sensitive loads after introducing the term of Custom Power by Hingorani in early 1980s. Custom Power Devices is classified into three categories by their structures such as Dynamic Voltage Restorer (DVR), Distribution STATCOM (D-STATC0M) and Unified Power Quality Compensator (UPQC). This paper presents the improvement of Voltage Sags, Harmonics Distortions and poor powers factors using Distributions Static Compensator (D-STATCOM) with LCL Passive Filters in distribution system. The model is based on then Voltage Source Converter (VSC) principles and PWM Technique. The D-STATCOM injects a current into the system to mitigate the voltages sags. LCL Passive Filter was then added to D-STATCOM to improve harmonics distortions and poor power factor. The simulations were performed using MATLAB SIMULINK versions R2009b.