LOAD FLOW STUDY OF POWER SYSTEM WITH UNIFIED POWER FLOW CONTROLLER

Abstract

The demand of the electrical energy is ever increasing and it is desired to use the existing transmission network to its thermal stability limits. The transmission capacity can be increased by the compensation at appropriate locations and it is a large interconnected network that requires a careful design to maintain the system with continuous power flow operation without any limitations. Flexible Alternating Current Transmission System (FACTS) is an application of a power electronics device to control the power flow and to improve the system stability of a power system. Unified Power Flow Controller (UPFC) is a versatile device in the FACTS family of controllers which has the ability to simultaneously control all the transmission parameters of power systems i.e. voltage, impedance and phase angle which determines the power flow of a transmission line. This project proposes a case study to control the power flow of a power system with UPFC. In this study, I am considering a standard 5-bus network and IEEE-30 bus network, for the analysis. Power flow equations are solved using Newton Raphson’s algorithm and the simulations of the algorithm are done in MATLAB 7.6.0. The results of the network with and without UPFC are compared in terms of active and reactive power flow in the transmission line at the bus to analyze the performance of UPFC. Software used MAT LAB 7.6.0