Voltage stability Margin Enhancement and Loss Reduction in Electrical Transmission System by Using FACTS Devices

Abstract

Increase in electric power demand, due to modernization has led to the increase in the number of power stations and their capacities and consequent increase in the power transmission lines which connect the generating stations to the load centers. Controlling power flow in modern power systems can be made more flexible by the use of recent developments in power electronics and computing and control technology. The Static VAR Compensator (SVC), can increase or reduce reactive power according to the demand of reactive power in the network to improve the stability, reduces system loss and also improves the load ability of the system. A simplified model of UPFC with network is introduced on the basis of the instantaneous power and reactive power function. To design the control system and evaluate the effect to improve power quality in the load system. The effectiveness of UPFC is concluded for the power quality control in the substation connected to the distribution network both for the voltage dip and harmonics distortion. It would function with the same principle to suppress the interaction between the distant high power supply and the distributed small power generator in the load network.in this paper SVC and UPFC are used to improve power quality in a power system and compared.the proposed method is tested on IEEE-14 bus system with Mat lab- programming Environment