A Review on STATCOM Controller for Power Quality Enhancement in Distributed System

Aman Guliya; Sandeep .

Abstract

New technologies, using power Electronics-based concepts, have been Developed to provide protection for Commercial and industrial customers from Power quality problems on the electrical Distribution system known as Custom Power Products. Custom power devices are classified into three categories by their structures such as dynamic voltage regulator (DVR), distribution static compensator (STATCOM) and unified power quality compensator (UPQC).The Distribution Static Compensator (D-STATCOM), one of the custom power product, is a shunt-connected Power electronics-based device, is used for compensation of reactive power i.e. unbalance in line thus protecting the electrical system from a polluting (flicker producing) Load. The STATCOM can be used in place of a traditional static VAR Compensator and offers many advantages. This consists of three phase voltage source inverter, injection transformer, DC LINK. The performance of the STATCOM depends on the control algorithm i.e. the extraction of the current components. So, for this, there are various control algorithms for the control of STATCOM block depending on various theories and strategies like phase shift control, instantaneous PQ theory, synchronous frame theory, Adaline based theory.