特大城市两种高压配网典型接线可靠性比较研究

随着电网规模的扩大,110 kV电网在特大城市内多用作高压配网。因此,对110 kV高压配网两种典型接线双链式接线和“3T”接线的可靠性进行了比较研究。给出了用解析法求解两种典型接线可靠性指标的方法,以及两种不同接线的可靠性指标理论计算值。此外,还对两种不同接线进行了灵敏度分析。结果表明,两种接线方式都能满足电网结构实际运行的需要,但“3T”接线的停电时间短于双链式接线,并且对备自投装置的正确投运率的灵敏度更好。

Comparative research on typical wiring reliability of two high voltage distribution networks in a megacity

With the expansion of power grid scale, the 110 kV power grid is most used as the high-voltage distribution network in mega cities. The reliability of double chain connection and "3T" connection of two typical connections in a 110 kV high-voltage distribution network is compared. The method of solving the reliability index of two typical but different connections by analytic method and the theoretical calculation value are given. In addition, the sensitivity analysis of two different wirings is also carried out. The results show that the two connection modes can meet the needs of actual operation of a power grid structure, but the outage time of "3T" connection is shorter than that of a double chain connection, and the sensitivity to the correct operational rate of the standby automatic switching device is better. This work is supported by the Natural Science Foundation of Guangdong Province (No. 2017A030313304).