Marginal sensitivity for transient stability of power system

Based on corrected transient energy function, a new sensitivity method of transient stability margin relative to certain parameter of power systems was proposed. By imposing restrictions on only one side, the transient stability margin and limit parameters of transient stability were more accurate and reliable. Based on variation principle in optimal control theory, the effect of parameter's variation on variables of dynamic system were also considered in the method. The simulation test of the algorithm on Chinese Shanxi power system validated its effectiveness and the reliability. The computational efficiency of the proposed method was three times higher than that of traditional method.