柔性互联配电系统连锁故障风险评估

为分析柔性多状态开关(FMS)保护隐性故障引起的柔性互联配电系统连锁故障风险,首先介绍其物理结构,随后分析稳态特性、交流馈线故障时的暂态特性,以及FMS的控制保护策略.然后,提出了引起保护误动的不确定因素并对其进行建模,并在此基础上分析了连锁故障形成的机理,建立柔性互联配电网连锁故障风险指标,并提出了基于蒙特卡洛法的概率指标和基于最优切负荷故障后果的计算方法.最后,以改进IEEE 33节点系统为算例,评估了系统连锁故障风险,并分析了故障位置和分布式电源渗透率因素对风险的影响.

Risk Assessment of Cascading Failures in Flexible Interconnected Power Distribution System

In order to analyze the cascading failure risk of flexible interconnected power distribution systems caused by hidden fault protection of flexible multi-state switch (FMS), this paper first introduces its physical structure. Then, the steady-state characteristic, the transient characteristic of AC feeder failure, and FMS control and protection strategies are analyzed. The uncertain factors that cause the protection malfunctions are proposed and modeled. On this basis, the mechanism of cascading failure formation is analyzed, and the cascading failure risk indicators of flexible interconnected power distribution networks are established. The probabilistic indicators based on Monte Carlo method and the calculation methods based on optimal load shedding failure consequences are also proposed. Taking the modified IEEE 33-bus system as an example, the risk of cascading failures in the system is evaluated, and the influence of the failure location and the penetration rate of distributed generators on the risk is analyzed.