基于行波自然频率的故障测距方法适应性分析

基于行波自然频率的输电线路故障测距方法利用故障行波自然频率的主成分进行精确故障测距,不依赖行波波头的识别.而实际电力系统中复杂的母线结构或者架空线-电缆混合线路波阻抗不连续,都可能影响故障行波自然频率主成分的精确提取.为此,研究了不同线路型式下故障行波频谱的识别方法,分析了影响自然频率精确提取的相关因素,讨论了电缆线路及架空线-电缆混合线路的自然频率提取方法;并仿真分析验证了该故障测距方法的适应性和精确性.

Applicability analysis for travelling wave natural frequencies based faults location method

Travelling wave natural frequencies based faults location mathod has good accuracy without identifying the wave front.The key to this method is extracting the dominant frequency correctly.The dominant frequency extraction may be influenced by the complex bus bar configurations and the impedance discontinuity of the overhead lines combined with cables in the power systems.Taking these problems into account the identification of fault travelling waves under different line types is proposed in this paper.The factors which disturb the natural frequencies extraction are discussed.Meanwhile the method adaptability to cable lines and mixed lines is validated.The accuracy of extracting the dominant frequency is studied by calculating the fault distance with the simulations results.