基于数学形态学的直流接地极引线C型行波故障测距

C Type Traveling Wave Fault Location for HVDC Grounding Lines Based on Mathematical Morphology

摘要: 本文在介绍C型行波测距原理和数学形态学理论的基础上，根据脉冲信号在接地极线路上的传播特性，提出了一种基于数学形态学的C型行波故障测距方法，该方法首先对脉冲信号在线路上的传播过程进行模量分离，再根据形态学算法进行滤波，并利用梯度变换分离出正反向行波浪涌，不仅具有一定的抗干扰性，而且能准确地识别第一个反射脉冲到达测量点的时刻。通过PSCAD仿真验证和MATLAB图形处理表明，该方法是可行的，且有利于提高高压直流接地极引线故障测距的可靠性和准确性。

Abstract: On the basis of introducing the principle of C type traveling wave fault location and mathematical morphology theory, this paper proposes a C type traveling wave fault location method based on mathematical morphology according to the propagation characteristics of the pulse signal in the grounding line. Firstly, this method carries on modulus separation of propagation process of the pulse signal on line, then, it uses the morphological algorithm for wave filtering, and the forward and backward waves are separated by the gradient transform. This method not only has certain anti-interference ability, but also can accurately distinguish the moment of the first reflection pulse reaching to the measuring point. Results show that the method is not only feasible but also helpful to improve the reliability and accuracy of the fault location for high voltage DC grounding wire through simulation of PSCAD and graphics processing of MATLAB.