SIMULATION BASED PERFORMANCE AND ANALYSIS OF GRID CONNECTED IRP CONTROL THEORY STATCOM WITH VARIATION OF DC LINK VOLTAGE

Abstract

The STATCOM (Static synchronous compensator) is a shunt connected voltage source converter using
self-commutating device and can be effectively used for reactive power control. This paper describes the modeling of
STATCOM in which linear controller of current and voltage is replaced by IRP (Instantaneous reactive power)
controller. The IRP p-q theory is based on the Clarke transformation.IRP theory consumes time of operation, it reduces
harmonic distortion and improves power factor. The IRP theory for the control of the VSC (Voltage Source Converter) in
the STATCOM. It takes a feed back of the grid voltage and source current for the compensation of the lagging power
factor. The static device used is ultra capacitor with controlled DC link voltage VSC. IRP controller allows an increase
in transfer of apparent power through a transmission line and much better stability by the adjustment of parameters that
govern the power system. The designed controller with variation of DC link voltage has been applied to the STATCOM
and suitable DC link voltage has been selected on basis of spike and overshoot of response. The total design and analysis
is carried out in MATLAB Simulink Software with complete graphical representation.