一种基于行波传播路径及其固有频率的电网故障定位思想.docVIP

 一种基于行波传播路径及其固有频率的电 网故障定位思想# 林圣，廖凯，何正友** 5 10 （西南交通大学电气工程学院，成都 610031） 摘要：基于行波固有频率的输电线路故障定位方法，无需识别行波波头及检测行波到达时刻 即可实现精确故障定位，具有一定优势。电网发生故障时其故障行波将沿不同的路径传 播，且其频谱中包含反映不同传播路径的固有频率分量，该频率值与行波传播路径的长度间 存在一定的关系。基于此，本文对基于行波传播路径及其固有频率的电网故障定位思想进 行了探讨研究。大量仿真分析表明，利用该定位思路能准确地判断出故障线路，且不受故 障位置、类型、电阻、初相角的影响，具有较好的适应性和一定的实用价值。 关键词：故障定位；行波；传播路径；固有频率；电网 中图分类号：TM77 15 A Natural Traveling wave propagation paths and its natural frequencies based fault location method for power network LIN Sheng, LIAO Kai, HE Zhengyou 20 25 30 35 40 (College of Electrical Engineering, Southwest Jiaotong University) Abstract: Fault location method based on natural frequency of traveling wave for transmission line has some advantages such as it can implement accurate fault location without identifying the wavefront of traveling wave and detecting of the traveling wave arrival time. The fault-originated traveling wave will spread along different paths in power network. And its spectrum contains the natural frequency components which reflecting different propagation paths and the natural frequency values have certain relationship with the length of the traveling wave propagation path. A fault location method of power network based on the traveling wave propagation path and its natural frequency is proposed in this paper. Large number of simulation analysis show that the method can identify the faulted transmission line accurately precisely, and it unaffected by fault positions, fault types, fault resistances and fault initial phase angles, has good adaptability and certain practical value. Key words: fault location；traveling wave；propagation paths；natural frequencies；power network 0 引言 行波故障定位方法具有定位精度高、可靠性高、稳定性好等优点，自诞生以来便受到广 大电力工作者的青睐[1-8]。单端时域行波故障定位方法因其仅依赖一端的行波信号便可估算 线路的故障距离，一直是研究热点；但其故障定位的可靠性决定于故障点反射行波波头的识 别[1]，在实际应用中仍存在一定的难度。同时，无论是单端还是双端时域行波定位方法在应 用中都存在故障初始行波达到的时刻难以标定[1-2]、传播速度难以确定[4-6]、故障行波波头难 以识别[7]等困难，因此为克服时域行波定位方法面临的上述困难，一些学者对故障暂态行波 频谱特征进行了研究，从频率的角度提出了基于行波固有频率的行波故障定位方法[9-12]。 基金项目：高等学校博士学科点专项科研基金(20