Emergency Repair Strategy Based on Importance Assessment of Transmission Lines

This paper puts forward a method for evaluating importance of transmission lines based on theil entropy and weighting method, and formulates emergency repair strategy. Firstly, two indicators, voltage variation theil entropy and power flow variation theil entropy, are constructed to investigate voltage change and power flow impact on power system caused by line failure. Secondly, considering the size of voltage and power flow variation and equilibrium of their distribution in power system, a comprehensive evaluation model of transmission lines importance is established by using weighting method. Thirdly, according to importance of lines, emergency repair strategy is formulated. Finally, the above research is simulated in IEEE 9-bus system to verify the feasibility and scientificity of the proposed method.