Optimal location of TCSC using sensitivity and stability indices for reduction in losses and improving the voltage profile

Major problem of heavily loaded system is, transmission networks are operating close to their limit which causes increase in stress on transmission lines. This problem was solved by the addition of isolated and individually controlled devices such as FACTS to the existing networks. This paper focuses on FACTS device-TCSC (Thyristor Controlled Series Capacitor) and its optimal location in the power system network. To decide optimal location of TCSC sensitivity factor methods and stability indices are used. These methods are applied on IEEE-14 bus system and its power flow analysis is done using PSAT (Power System Analysis Tool Box) software. Reactive and real power loss sensitivities, and line voltage stability indexes are calculated for each line and power flow results are compared with and without TCSC in sensitive and critical lines.

I. Introduction

Because of the increase in populations and economies there is a necessity of increase in the capacity, flexibility, reliability and security of the power transmission system. Due to the changing market conditions, power utilities are looking at different ways to utilize old transmission lines efficiently till their operating limits. To reach these objectives power flow control equipment such as FACTS devices are utilized to uniformly distribute power flow in the entire system [1].