Toward on-line line switching method for relieving overloads in power systems

An on-line line switching method based on a three-stage strategy to effectively relieve overloads in power systems is proposed. The proposed method is designed for on-line applications in the control center environment. To balance the requirements of solution speed and of effectiveness, the proposed three-stage method is composed of screening stage, ranking stage and detailed analysis stage. One distinguishing feature of the proposed method is that it provides multiple high-performance solutions for both single line switching as well as multiple line switching. To evaluate the proposed on-line line witching method, numerical studies are conducted on the IEEE 39-bus and a 2746-bus systems. Simulation studies indicate the proposed method can effectively alleviate overloads in power systems with promising results.