基于形态梯度与小波变换模之和的行波启动元件  

Traveling-wave starting algorithm based on morphological gradient and wavelet transform modulus sum

作　　者：苏煜[1] 罗四倍[2] 王薇[1] 

机构地区：[1]西安供电局,陕西西安710032 [2]河南科技大学车辆与动力工程学院,河南洛阳471003

出　　处：《电力系统保护与控制》2009年第23期5-8,34,共5页Power System Protection and Control

摘　　要：行波启动元件是超高速保护和行波测距中必不可少的重要组成元件。在阐述数学形态学基本理论的基础上,提出将形态梯度应用于行波启动元件,以解决现有的行波启动元件算法在弱故障下灵敏度不足、可能拒动的问题;进而通过能够用于非孤立奇异信号检测的小波变换模之和来准确区分故障行波与噪声干扰,从而构成一套较为完善的行波启动元件算法,弥补了以往行波启动算法的不足。大量ATP仿真测试验证了该启动算法在保证快速性的同时,既有效提高了反应故障的灵敏度,又增强了启动的可靠性。The traveling-wave based starting element is very important for ultra-high-speed protection and traveling-wave based fault locator. Based on illustrating the basic theory of mathematical morphology, morphological gradient is applied to the new traveling-wave based starting element in order to solve the deficient sensitivity and even fail-function under weak faults, which problems appear in the previously proposed starting algorithms. And because wavelet transform modulus sum is quite suitable for the non-isolated singularity detection, it is also utilized in the new starting algorithm to correctly distinguish fault traveling-wave from noise disturbance. Thus a newly perfect starting element is proposed, and a number of ATP simulation tests show that the new starting algorithm is sensitive and reliable, while ensuring the fast operation.

关 键 词：输电线路 超高速保护 暂态量保护 行波 启动元件 形态梯度 小波变换 

分 类 号：TM773[电气工程—电力系统及自动化]