Real power flow control in transmission system using TCSC

Interconnected transmission system provides a wide scope for power sharing thereby avoiding chances of overloading in transmission lines. But this can be achieved only with proper control on the transmission network. The aim of this work is to improve the real power flow in the transmission lines by varying the transmission line reactance. Real power flow can be improved by series compensation using a Static Series Compensator (SSC). A fixed capacitor connected in series with the transmission line can effectively reduce the transmission line reactance thereby improving real power flow. But series compensation using a capacitor can provide only fixed compensation, a smooth variation in reactance cannot be achieved. In this paper a Thyristor Controlled Static Series Compensator (TCSC) is used for controlling the power flow in the transmission line. Open loop control of TCSC by varying the firing angle is simulated using MATLAB. A hardware implementation of TCSC to analyse the power flow control is deployed in a 2-bus system.