Optimal Location and Sizing of FACTS Device for Enhancement of Voltage Stability

Abstract

It is becoming increasingly important to fully utilize the existing transmission system assets due to environmental legislation, rights-of-way issues and costs of construction and deregulation policies that introduced in recent years. The Static Var Compensator (SVC) has been proposed for the better control power flow and dynamic performance. The exact long transmission line model consists of the resistance and reactance. Most of previous researches studies transient stability performance of the SVC in SMIB (Single Machine Infinite Bus) System with neglecting resistance of the line. This paper presents the use of a recent developed algorithm inspired by the hunting mechanism of antlions in nature called Shuffled Frog Leaping Algorithm (SFLA) for solving Optimal Reactive Power Dispatch (ORPD) problem considering a large scale power system. SFLA algorithm is used to determine the optimal location and size of Static Var Compensator (SVC) in a transmission network. One of the most interesting things in antlions is that they have a unique hunting behavior and exhibit high capability of escaping the local optimal stagnation. The SFLA is used to find the set of optimal control variables of ORPD problem, such as generators terminal voltage, position of tap changers of transformers, and number of switchable capacitor banks. The performance and feasibility of the proposed algorithm are demonstrated through several simulation cases on IEEE 14-bus system