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电网技术  2011 

基于多分辨形态梯度–相关函数综合测距算法的单端行波故障测距

, PP. 225-229

Keywords: 形态梯度,相关函数,行波,故障测距

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Abstract:

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。

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