Modelling and Analysis of TCSC Application to Transmission System

Abstract

The need for more efficient electricity systems management has given rise to innovative technologies in power generation and transmission. Flexible AC Transmission Systems (FACTS) is one of such technologies that respond to these needs. It significantly alters the way transmission systems are developed and controlled together with improvement in asset utilization, system flexibility and system performance. Different types of FACTS devices are being used now-a-days. Thyristor Controlled Series Compensator is one of the series compensating FACTS devices. Thyristor Controlled Series Compensator (TCSC) consists of a series compensating capacitor shunted by a Thyristor Controlled Reactor (TCR). The basic idea behind the TCSC scheme is to provide continuously variable impedance by means of partially canceling the effective compensating capacitance by the TCR. Transmission lines compensation by means of TCSC can be used to increase the power transfer capability, improve transient stability, reduce transmission losses and dampen power system oscillations. In this thesis work device modelling of TCSC has been carried out along with development of transmission system using MATLAB7.5/Simulink. Then this device has been applied to the transmission network using Power System blockset. The response of transmission systems has been studied for various types of faults with and without TCSC, thus analyzing the impact of TCSC on the performance of transmission line in terms of various parameters, under consideration. Impact of variation of degree of compensation on power flow has also been studied which shows that for a fixed angular difference, with the increase in degree of compensation power flow increases.