earticle

영어

For the improvement of voltage stability, it is suggested that Flexible AC Transmission System (FACTS) devices are to be incorporated properly in the transmission lines. In this paper the voltage stability enhancements with two FACTS devices namely unified power flow controller (UPFC) and interline power flow controller (IPFC) have been studied using GA-GSA hybrid algorithm. A comparative analysis is made between the two devices based on different factors such as voltage profile improvement, loss minimization, cost of investment and voltage stability improvement. Newton-Raphson method is used for power flow analysis before and after insertion of each FACTS device. Depending on the voltage collapse scenario the best locations for inserting the FACT device are determined by using GA algorithm. At each location the rating of FACTS device is determined by using GSA algorithm. After that final optimal location and the exact capacity of FACTS device is calculated by considering the losses and cost of device .That optimal rated FACT device is inserted at the selected location and the performance of the system is observed. The complete evaluation is done on IEEE-30 bus test system by using MATLAB. From the simulation results, an elaborate comparison has been made between UPFC and IPFC based on the performance of the system with each of these two FACTS devices for voltage stability improvement.