电网连锁故障的激发因素研究

以直流潮流算法为基础,针对电网潮流转移引发连锁过载的一类连锁故障,详细分析了电网连锁故障的激发因素,指出在电源容量和负载一定的前提下,当初始开断事故发生后电网的初始潮流、电网的拓扑结构、电网的支路参数以及初始开断位置等因素是引发新的开断事件发生进而激发连锁故障事故发生的主要因素,针对引发连锁故障的极限潮流状态,提出了一种实用求解方法,并在IEEE-14系统上进行了算例分析,研究表明,激发连锁故障的极限潮流状态并不是唯一,但可以根据实际情况,求出一些合理、可信的极限潮流状态,从而对运行实践提供指导。

Research in triggering factors of power network cascading failure

Aiming at cascading overload aroused by power flow transition and based on direct current flow algorithm, this paper analyzes the triggering factors of cascading failure in power network. Through analysis, this paper points out that the triggering factors of cascading failure mainly comprise initial flow, network structure, branch parameter and initial outage branch of power network when an initial outage event happpens in a system of fixed power source capacity and fixed load. Furthermore, a method of obtaining the limited flow condition under which cascading failure will occur is proposed, and an example with IEEE-14 system is presented. The research shows that the limited flow condition is not exclusive, but some rational and credible limited flow condition which will provide guidance for practical operation can be obtained.