IDENTIFICATION OF WEAK BUSES AND IMPROVING VOLTAGE PROFILE UNDER VARING LOAD CONDITIONS USING STATCOM IN IEEE-14 BUS POWER SYSTEM

Abstract

The whole world faces energy shortages, power scenario in present. There is a deficit between energy demand and energy supplied. The per capita energy consumption indicates the living standard of the society of the country and also it shows the development of the country. Every country is trying to harness the energy obtained from natural resources and maximize it, due to the limited resources of the fossil fuels. The major issue in these problem is the voltage collapse of transmission system which is most suffered by the frequent variations load. In this project, we focus on the detection and identification of weakest busses under variation load. Voltage variation problem increase day-by-day with increasing load demand power. Therefore the efficiency and power quality of power is become poor for consumer service due to increasing load demand, voltage goes down. Thus the system stability or voltage profile is poor at various buses in an interconnected power system under varying load conditions (varying load 0 to 50% increasing). Hence the voltage magnitudes and angles also change which are responsible for voltage instability which have major result in blackout. For the continuation power flow voltage magnitude, angle, real and reactive power should be maintained so that voltage stability improved. Finding the weakest buses during increasing load by Newton-Raphson method with MATLAB programming and compare all results with original results with and without STATCOM in an interconnected in IEEE 14 bus power system. As the results the voltage at the buses goes below to specified voltage profile lower limit 0.98 p.u. during heavy load conditions or voltage may exceed voltage profile upper limit 1.0 p.u. during light load conditions, at there identified weakest buses allocation for the adjusted FACTS controllers to improve voltage profile limit (0.98 p.u or 1.0 p.u ) of IEEE-14 bus power system to maintained reactive power in IEEE-14 power system.