Line Loadability Improvement by using TCSC under Network Contingencies

Abstract: Hassled power system, either due to increase loading or due to severe contingencies, often leads to situation where system no longer remains in the secure operating region. Under these situations, it is primary objective of the operator to apply control action to bring the power system into the secure region. Any delay or unavailability of suitable control, the system may become unstable. FACTS devices can play very important role in power system security enhancement. The Thyristor Controlled Series Capacitor (TCSC) is one of the most effective Flexible AC Transmission System (FACTS) devices. It offers smooth and flexible control of the line impedance with much faster response compared to the traditional control devices. It may be used to enhance system performance by controlling the power flows in the network and to alleviate /eliminate the overloads on the transmission lines under network contingencies. The Newton-Raphson ac power flow method was used to perform the above studies. The performance of the proposed algorithm has been tested for IEEE-14 bus system. Programming of the power flow studies is carried out by using MATLAB