ANALYSIS OF LOAD FLOW STUDIES WITH UPFC POWER INJECTION MODEL

Now-a-days the Flexible AC Transmission Systems (FACTS) is very popular and essential device in power systems. After introducing the FACTS technology, power flow along the transmission lines becomes more flexible and controllable. Several FACTS-devices have been introduced for various applications in power system. Among a variety of FACTS controllers, Unified Power Flow Controller (UPFC) is the most powerful and versatile device. The UPFC is a device which can control the flow of real and reactive power by injection of a voltage in series with the transmission line. Both the magnitude and the phase angle of the voltage can be varied independently. This thesis is focused on to improve the bus voltage and to reduce the active and reactive power losses in the transmission lines incorporating steady state model of UPFC in Newton-Raphson (NR) power flow algorithm. The steady state model of the UPFC, derived from two voltage source representation, is presented and analyzed in detail. A MATLAB program is executed to incorporate the UPFC model in NR Load flow algorithm. To determine the steady state performance of the UPFC in the load flow studies a IEEE 30 and IEEE-14, IEEE-5 bus systems has taken.