The sensitive line identification in resilient power system based on fault chain model

A concept of sensitive line set is presented in this paper, aiming to enhance the ability of resilient power system to prevent and resist the external extreme disturbances. Furthermore, a new fault chain model is established, in order to obtain the above sensitive line set. The fault chain, calculated by this fault chain model, is consisted of the initial segment and the middle segment. The index of bus load rate for the initial and the middle segments is presented firstly to reflect the load condition of a system in the fault chain model. Besides, other indices, such as historical fault statistics, line load degree, and correlation coefficient in the initial segment and power flow transfer, sequent overload of lines, and damage of transmission sections in the middle segment, are concerned and normalized to predict all the fault chains. Then, the sensitive line set can be obtained after the risk calculation and level assessment for the fault chains. The set can become the basis for controlling process of resilient power system during the accident preventing and resisting stages. Finally, the rationality of the proposed sensitive line set is demonstrated via 39 bus system.