An anticipated multi-contingencies selection method based on fault influence domain

To solve the issues of low calculating efficiency and long calculating time caused by large amount of anticipated multi-contingencies in the static security analysis of provincial power grid in China, an anticipated multi-contingencies automatic selection method based on fault influence domain is researched and implemented. Firstly the transfer coefficient is used for signifying the active power flow change of branches before and after contingency of another branch. Then according to the transfer coefficient, the branches which the power flow significantly increased and closed to the short-term overload capacity are defined as the fault influence domain of certain branch. Finally the important anticipated N-2 contingencies are automatically selected according to the relationship between every fault influence domain. The theory of this method is simple, and facilitates programming realization. The selected results of IEEE 39-bus system and actual provincial power grid in China prove the reliability and practicality of this method.