Investigation of Effect of Harmonics on Voltage Stability in a Grid System by SVC

This paper investigates the role of Static Var Compensator (SVC) on stability of voltage in grid system due to the presence of harmonics.. Here the design of SVC is based on the combination of Thyristor switched capacitors (TSC’s) and Thyristor controlled reactor (TCR) . TSC’s are used for switching the capacitor banks on and off while the TCR continuously controls the reactive power by varying the current amplitude flowing through the reactor.But harmonics are induced in grid system due to TCR.In this paper FACTS controller such as Static Var Compensator is used to maintain the system voltage within limit by minimizing the harmonics internally. It is proposed to develop SVC with firing angle controller for 220KV,100 MVA transmission system. Proposed work is aimed at mathematical modeling of svc,development of control strategy and investigations of the performance of control strategy using MATLAB/SIMULINK. Keywords— {Flexible a.c.transmission system (FACTS), Static var compensator(svc), Thyristor controlled reactor(TCR), Thyristor switched capacitor(TSC), Power electronics, Thyristors etc}.