摘要
针对行波相关法测距可靠性和准确性较低的问题,提出一种用于单端行波故障测距的多分辨形态梯度–相关函数综合测距算法。梯度算法对噪声敏感,通过改进,在其中加入形态滤波算法,并适当加宽结构元素宽度,从而提高梯度算法的抗干扰能力。利用新型多分辨形态梯度变换分离行波浪涌,通过一个可变的结构元素实现对行波浪涌宽度的控制,使行波浪涌具有确定的宽度。算法中的结构元素是一个二进递减的可变扁平结构元素。将多时窗行波相关法的初始时窗长度和结构元素初始宽度设为相同,并使其以二进递减的方式变化,对行波浪涌进行多层相关分析,以实现对输电线路的故障测距。ATP仿真研究表明,所提算法对不同的故障距离均适用,具有较高的测距可靠性及测距精度。
To remedy such defects as low reliability and unsatisfied accuracy of fault location by traveling wave correlation algorithm, a single terminal traveling wave fault location based on fault location algorithm integrating multi-resolution morphological gradient with correlation function is proposed. To improve the shortcoming of gradient algorithm that it is sensitive to noise, the morphological filtering algorithm is added into it and the width of structuring element is appropriately widened to enhance the anti-interference ability of gradient algorithm. The surge caused by traveling wave is separated by a new type of multi-resolution morphological gradient transform, and by means of a variable structuring element the control of the width of traveling wave surge is implemented to make traveling wave surge possessing determined width. The structuring element in the proposed algorithm is a binary-diminishing element with variable flat structure. Setting the initial time-window length of multi time-window traveling wave correlation algorithm and the initial width of structuring element as the same and making them varying in the way of binary-diminishing, the multi-layer correlation analysis of traveling wave surge is performed to implement fault location of transmission line. Simulation results by Alternative Transients Program （ATP） show that the proposed algorithm is suitable to various fault distances and can offer higher fault location reliability and location accuracy.
出处
《电网技术》
EI
CSCD
北大核心
2011年第10期225-229,共5页
Power System Technology
关键词
形态梯度
相关函数
行波
故障测距
morphological gradient
correlation function
traveling wave
fault location
