Implementation of Unified Power Flow Controller (UPFC) for Improvement of Voltage Profile and minimization of Transmission losses by Conventional Method

In modern power system network, due to continuously increased load demand the transmission losses reduction and the voltage profiles improvement are the major tasks and moreover the power system networks are imposed to more stressed. These factors are very much important in analyzing the power system network. With the rapid improvement of power electronic technology has made FACTS for the solution of future power system. Among these Flexible AC Transmission System devices, UPFC is one of the most effective device for increasing the transfer capability of the transmission system, voltage profile improvement and transmission losses reduction power system. However, to achieve the above mentioned advantages, the UPFC should be properly located in the network with suitable parameters. Voltage sources model is adopted to understand the behaviour of the UPFC in controlling the active, reactive power and voltage profile and this model is introduced in Newton Raphson algorithm for the study of load flow. In this present paper Fast Voltage Stability Index (FVSI) is described for the purpose of finding suitable placement of UPFC in the network and for reducing the losses, suitable sizes are. The proposed work is applied to two test cases which are IEEE 30, IEEE 57 and IEEE 118 bus systems