基于广域信息的振荡中再故障识别与定位

发布时间：2018-02-15 11:51

本文关键词： 广域测量信息振荡再故障综合序分量电流差动保护故障定位智能电子设备　出处：《电网技术》2014年12期 　论文类型：期刊论文

【摘要】：采用综合序分量构成差动电流,提出了一种差动保护原理用于识别互联电网振荡过程中再故障,能有效提高经大过渡电阻接地故障的检测灵敏度,改善振荡中心附近短路传统负序元件灵敏度低的问题。为进一步识别故障元件,利用配合关系矩阵描述智能电子设备(intelligent electronic device,IED)间的相互配合关系,并结合多点方向信息确定与故障元件直接相连的IED,这些IED保护对象的交集即为故障元件。算例分析表明,所提的广域保护原理简单易行,不受振荡频率偏移和系统运行方式影响,耐过渡电阻能力强,能很好实现振荡再故障判断及定位,作为现有振荡再故障保护的冗余补充能有效提高保护性能。
[Abstract]:A differential protection principle is proposed to identify the secondary faults in the oscillation process of interconnected power network by using the integrated sequence component to form the differential current, which can effectively improve the detection sensitivity of the grounding fault through the large transient resistance. The problem of low sensitivity of conventional negative sequence elements near the oscillation center is improved. In order to further identify the fault elements, the coordination relationship between intelligent electronic devicebus and intelligent electronic equipment is described by using the coordination relation matrix. The intersection of these IED protection objects is the fault element, and the example analysis shows that the proposed wide-area protection principle is simple and practical. It is independent of the oscillation frequency offset and the operation mode of the system, and has strong resistance to transition, which can well realize the diagnosis and location of the oscillation and re-fault. As a redundant supplement to the existing oscillatory and re-fault protection, the performance of the protection can be improved effectively.
【作者单位】：智能电网教育部重点实验室(天津大学);
【分类号】：TM773

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