中文摘要：

目前由简单扰动引起的电力系统连锁故障是威胁大规模电网安全稳定运行的一个重要因素。为找出降低电网发生连锁故障的风险的有效方法，使用连锁故障搜索模型在IEEE RTS96系统上分析了关键线路的故障率、隐藏故障概率、关键线路传输功率上限以及采取新的控制措施对连锁故障风险指标的影响，结果表明降低关键线路的故障率、在某些节点间增加1回线路和采取新的控制措施是比较有效的降低连锁故障的风险的方法，而降低隐藏故障发生的概率对系统的风险指标影响不大。

英文摘要：

Nowadays, power system cascading failures starting at a simple disturbance becomes a key factor that threatens the stability of bulk power grids. To find out effective measures to reduce the risk of cascading failures in power grids, by means of IEEE RTS 96 system a cascading failures searching model is used to analyze the impacts of the faulty probability of key lines, probability of hidden failures and transmission limits of key lines as well as adopting new control measures on risk index of cascading failures. Simulation results show that lowering the faulty probability of key lines, adding a line between two specific nodes and adopting new control measures are effective methods to reduce the risk of cascading failures, and the impact of reducing the probability of hidden failures on risk index is limited.