The study on optimizing re-closing time to improve the transmission capacity

Based on the transient energy function (TEF) theory with classical models considered, the optimal re-closing time (ORT) can be calculated accurately. This paper mainly focuses attention on the validity and practicability analyzing of ORT obtained from this method. Firstly, the characteristics and influencing factors of the ORT are put forward and analyzed, and also the setting strategy of re-closing time for transmission line is presented. Further more, it will conduct simulations with a complex real system of China North Grid. Finally, the setting scheme is drawn to optimize the re-closing time of the key transmission lines in the network under current technological conditions. It is indicated that this method is an attractive counter-measure against transient instability and improving the transmission capacity of power system.