EFFECT OF THE UPFC ON A MULTIMACHINE POWER SYSTEM STEADY STATE AND DYNMANIC PERFORMANCE

Abstract

The fast progress in power electronics is rapidly expanding the field of applications for the Flexible AC Transmission Systems (FACTS) controllers in power systems. FACTS technology is a new solution to improve the reliability and provide more controllability and flexibility for the power system. Unified Power Flow Controller (UPFC) is the most versatile FACTS that can control independently and simultaneously all the parameters (line impedance, voltage magnitude and phase angle) of the line power flow. This paper present a comparative study of a two area 9 bus multimachine power system with and without the UPFC based on the improvement of the power flow, and the amelioration of the dynamic stability under fault conditions.