Configure vulnerability assessment based on potential energy model

According to the integral theory of energy function, branch potential energy function model is constructed, and then two indexes are proposed: one is the current vulnerability, which quantifies the distance between the current transmitted power and initial transmitted power to identify the current vulnerable area, the other is the forecasting vulnerability, which is gained through computing the branch vulnerability considering the impact of power injection changing. By the two indexes, the current and forecasting vulnerable area can be identified and the correctness of the former one can be validated. Through the simulations in IEEE-30 bus system and the comparison with optimal power flow under N-1 and N-2 faults, the results show that the branch potential energy function model have many advantages such as rapid computation without being influenced by the convergent condition of power flow, identifying and forecasting the vulnerable branch exactly. Because of these, the application of this method on the on-line security monitoring is expected.