基于数学形态学的输电线路精确故障定位

Accurate Fault-location of Transmission Lines Based on Mathematical Morphology

在介绍数学形态学基本原理的基础上,给出了利用数学形态学梯度技术提取暂态行波故障特征,反映故障行波折返射时刻的行波测距新方法。通过仿真软件着重对近距离故障、高阻接地故障,电压过零时刻故障等传统方法难以精确定位的故障类型进行了大量的仿真研究,同时利用A、B型测距原理进行了故障定位;并利用此方法对某500kV输电线路故障后行波故障定位装置记录的故障数据进行了实例验证;仿真结果和实例验证结果都表明,利用数学形态学梯度技术不仅能够对这些传统方法难于准确定位的故障类型精确定位,而且算法简单,耗时较小,易于硬件实现,对高压输电线路精确故障定位装置的研制提供了理论和技术依据。

On the basis of basic theories of mathematical morphology of the introduction, the paper provides a novel fault location method of travelling wave based on mathematical morphology gradient technology which can efficiently extract the fault characteristic of transient travelling wave and reflects the time of refraction and echo of fault travelling wave. Near distance fault, large resistance grounding fault and voltage zero fault were largely simulated by PSCAD, at the same time, the paper used A and B types fault location theory to locate the fault place and used the method to validate project examples in which the data were registered by fault location device using travelling wave in 500kV line; the result of simulation shows that the novel method based on mathematical morphology gradient technology not only is able to accurately identify those faults which are hard for traditional methods to locate but also its algorithm is simple, expends very short time and is easy to apply for hardware. The paper provides theory foundation and technology support for the research of the accurate fault location device.