考虑双馈异步风机特性的自适应接地距离保护

发布时间：2018-05-08 13:06

本文选题：双馈异步风机 + 撬棒电阻　；参考：《电工技术学报》2017年05期

【摘要】：研究风电场故障特性对继电保护的影响。针对双馈异步风机投入撬棒电阻后正序阻抗和负序阻抗不相等的特征,分析了传统接地距离保护I、II、III段在保护安装处所测量到的阻抗与实际阻抗的异同。若利用传统整定原则来整定接地距离保护II段,保护可能拒动。根据接地故障时的测量阻抗,提出了考虑双馈异步风机特性的自适应接地距离保护II段的整定方法。该方法在线计算自适应分支系数,使保护安装处的测量阻抗更为准确地反映保护安装处到故障点的距离。利用DIg SILENT仿真软件搭建含风机的线路模型进行仿真分析,验证了自适应接地距离保护的灵敏性,同时该保护的可靠性得到有效提高,且不失选择性。
[Abstract]:The influence of wind farm fault characteristics on relay protection is studied. In view of the fact that the positive and negative sequence impedance of the doubly-fed asynchronous fan is not equal after it is put into the bar resistance, the similarities and differences between the impedance measured in the traditional earthing distance protection I / II III section and the actual impedance in the protection installation place are analyzed. If the traditional setting principle is used to set the earthing distance protection section II, the protection may be rejected. According to the measurement impedance of grounding fault, an adaptive earthing distance protection section II setting method considering the characteristics of doubly-fed asynchronous fan is proposed. In this method, the adaptive bifurcation coefficient is calculated online, so that the measurement impedance of the protection installation can more accurately reflect the distance from the protection installation to the fault point. DIg SILENT simulation software is used to build the circuit model with fan for simulation and analysis, which verifies the sensitivity of adaptive grounding distance protection. At the same time, the reliability of the protection is improved effectively and the selectivity is not lost.
【作者单位】：上海交通大学电子信息与电气工程学院;
【基金】：教育部科学技术研究资助项目(113023A)
【分类号】：TM614;TM773

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