Using SVC to Economically Improve Transient Stability in Long Transmission Lines

Abstract

ABSTRACTThe aim of this paper is to select the optimal size, location, and parameter setting of static var compensator (SVC) to improve power system stability in long transmission lines. Two objectives are considered in this paper to improve both the transient stability of the system and the SVC investment cost. In this study, the actual model of the long transmission line is considered to accurately determine the SVC location. By using the actual model of the line for long transmission lines, the SVC investment cost is reduced and the results have more accuracy than that found when the simplified model was used. In addition to placement of SVC for improving the system transient stability, an extra controller is used and adjusted to enhance the performance of the SVC. The problem is formulated as a form of multi-objective function and then multi-objective particle swarm optimization (MOPSO) is used to solve the problem and find the solution. In this research, results are presented as a set of responses to help the decision maker choose the appropriate response. A two-area test system with long transmission line is used to show the effectiveness and efficiency of the proposed method. The results of the non-linear simulation show that the optimum sizing, siting, and parameter setting of SVC can improve greatly the system's transient stability and reduce the SVC investment cost.