基于大容量快速开关限制短路电流措施研究

为有效解决宁夏电网短路电流超标问题,提出一种基于大容量快速开关限制短路电流的方法。该方法以变电站母线分列运行限制短路电流为理论基础,分析了基于大容量快速开关限制短路电流的基本原理,在此基础上进一步深入研究了快速开关提升系统暂态稳定性的根本原因。以宁夏电网中某750 kV变电站330 kV母线发生三相短路故障为算例,分析比较了此方法与传统限制短路电流方法的效果,以及使用该方法后系统的暂态稳定情况。仿真结果表明:基于大容量快速开关的限制短路电流措施不仅能够显著地抑制短路电流,而且能够提升系统暂态稳定性。

Research on limiting short - circuit current based on large capacity fast switching

In order to effectively solve the problem of excessive short-circuit current in Ningxia pow-er grid, a method based on large capacity quick switch to limit short-circuit current was proposed.With the theoretical basis of limiting the short-circuit current for the separating operation of the sub-station bus, the basic principle of limiting the short-circuit current based on the large-capacityquick switch was analyzed, and the fundamental reason of improving the transient stability of the sys-tem by the quick switch was further studied. Taking the example of the three-phase short-circuitfault of 330 kV bus in 750 kV substation in Ningxia power grid, the effects of the proposed methodand the traditional short-circuit current limiting method, as well as the transient stability of the sys-tem after using the method, are analyzed and compared. The simulation results show that the short -circuit current limiting measures based on the large-capacity quick switch can not only significantly inhibit the short-circuit current, but also improve the transient stability of the system.