Online Line Switching Method for Enhancing the Small-Signal Stability Margin of Power Systems

Abstract

As a power system operating point alters its position due to variations in power injections, its small-signal stability margin (SSSM) may decrease. Under this situation, a network topology change via line switching can increase the SSSM. In this paper, an online line switching method for maximizing the SSSM is presented, taking into account both the solution quality and the required computational speed. To balance the tradeoff between speed and solution quality, the line switching method presented in this paper is composed of three stages: 1) screening; 2) ranking; and 3) detailed evaluation. The effectiveness of the presented three-stage method is evaluated on IEEE standard power systems with promising results.