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基于动态潮流的电网连锁故障模型及关键线路识别

DOI: 10.13334/j.0258-8013.pcsee.2015.03.014, PP. 615-622

Keywords: 连锁故障,动态潮流,发电机调速,负荷特性,电压稳定,评估指标

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Abstract:

研究电力系统连锁故障机理有助于电网安全分析与控制,为此提出考虑发电机调速及负荷电压、频率特性的动态潮流连锁故障模式搜索方法。根据故障状态下雅克比矩阵对角元素值的变化,推导出系统电压稳定评估指标和系统处于电压崩溃临界点时的电压临界值。随着负载率的增大,系统电压稳定指标会逐渐下降,但临界值始终维持在0.5左右。将所提评估指标应用于电网关键线路辨识,对IEEE39节点系统的仿真表明:所提线路关键性指标比传输功率和权重介数指标更为全面,PSASP时域仿真结果验证了所提方法的有效性。

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