ENHANCEMENT OF TRANSIENT STABILITY OF MULTI-AREA POWER SYSTEM USING FACTS DEVICES

Abstract

This paper presents the increasing demand for electrical power and restrictions on expanding transmission networks have led to stressed power systems, raising concerns about stability. One solution to mitigate these issues is the implementation of Flexible AC Transmission System (FACTS) devices, such as Static Synchronous Compensator (STATCOM), Static VAR Compensator (SVC), and Unified Power Flow Controller (UPFC). These controllers enhance power transmission efficiency by regulating voltage, managing power flow, and improving transient stability without requiring additional transmission lines. This study focuses on the role of the UPFC in enhancing the transient stability of a multi-machine power system. The UPFC integrates shunt and series compensation to dynamically control power flow and inject reactive power, thereby reducing the risk of system instability following disturbances. By actively damping power oscillations and preventing loss of synchronism, the UPFC plays a critical role in ensuring the reliability of interconnected power systems. To evaluate its effectiveness, a three-machine, nine-bus Western System Coordinating Council (WSCC) multi- machine power system is analyzed under different fault conditions using MATLAB Simulink. The study examines fault clearing times and the UPFC’s impact on transient stability under severe disturbances through simulation models. The MATLAB-based simulation results demonstrate the UPFC’s capability to enhance power system stability by improving voltage regulation, damping power oscillations, and increasing transient stability. The findings confirm its role as a valuable asset for modern power networks facing increasing operational challenges.