数学形态学的混合线路故障滤波及定位

随着城镇化建设的推进以及越来越多的跨海输电工程,采用架空-电缆混合线路越来越多,快速准确定位混合线路中故障点是保证电网稳定运行的基础。文章提出一种基于数学形态学故障波形滤波以及故障定位的方法,考虑实际测量环境中各种噪音,采用数学形态学中的梯度变换来突出暂态行波的突变点,确定折反射行波经过测量点时间；分析折反射行波传播的路径,通过时间差值来确定故障点,并以某线设备安装站的监测数据进行对比验证。结果表明,数学形态学滤波较好地恢复了波形原始形貌,在不同噪声类型下都有较好的适应性,故障定位也与实际情况较为符合。此成果对混合线路的识别定位提供了重要依据。

Mathematical Morphology Research on Mixed Line Fault Filtering and Localization

With the promotion of urbanization construction and more and more cross-sea transmission projects, more and more overhead and cable hybrid lines have been adopted, and the fast and accurate fault location in hybrid lines has been regarded as the basis to ensure the stable operation of the power grid. A method of fault waveform filtering and fault location based on mathematical morphology was proposed. Various noises in the actual measurement environment were considered. The gradient transform in mathematical morphology was used to highlight the abrupt point of transient traveling wave, and the time of reflected traveling wave passing through the measuring point was determined. The propagation path of the reflected traveling wave is analyzed, the point of failure is determined by the time difference, and the monitoring data of a line equipment installation station is compared and verified. The results show that the original morphology of waveform is well recovered by mathematical morphological filtering, and has good adaptability under different noise types, and the fault location is in good agreement with the actual situation. This result provides an important basis for the identification and positioning of hybrid lines.