华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (10): 172-177.

• 创刊五十周年纪念专辑 • 上一篇    下一篇

HVDC 换相失败小波故障诊断方法

张尧 林凌雪 钟庆   

  1. 华南理工大学 电力学院,广东 广州 510640
  • 收稿日期:2007-03-01 出版日期:2007-10-25 发布日期:2007-10-25
  • 通信作者: 张尧(1948-) ,男,教授,博士生导师,主要从事电力系统运行与稳定研究. E-mail:epyzhang@scut. edu.cn
  • 作者简介:张尧(1948-) ,男,教授,博士生导师,主要从事电力系统运行与稳定研究.
  • 基金资助:

    国家自然科学基金重点资助项目(50337010)

Fault Diagnosis Based on Wavelet for Commutation Failures in HVDC

Zhang yao  Lin Ling-xue  Zhong Qing   

  1. School of Electric Power , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2007-03-01 Online:2007-10-25 Published:2007-10-25
  • Contact: 张尧(1948-) ,男,教授,博士生导师,主要从事电力系统运行与稳定研究. E-mail:epyzhang@scut. edu.cn
  • About author:张尧(1948-) ,男,教授,博士生导师,主要从事电力系统运行与稳定研究.
  • Supported by:

    国家自然科学基金重点资助项目(50337010)

摘要: 将小波变换应用于高压直流输电( HVDC) 系统换相失败的故障诊断中,基于多尺度分析分别对不同故障情况下的直流电流进行分解,并利用尺度能量和尺度煽这两种小波处理方法提取故障特征,分别定义两个故障诊断指标作为辨识各种故障的判据,然后针对这两个指标分别设直4 个间值以诊断直流线路故障和换相失败故障.仿真表明,在不同的HVDC 系统故障情况下,暂态信号小波尺度能量和尺度煽的分布都具有一定的规律性,可分别作为判断系统故障前有效依据,提出的判据能准确地对换相失败故障做出诊断.

关键词: HVDC 系统, 换相失败, 小波变换, 尺度能量, 尺度焰, 故障诊断

Abstract:

This paper proposes a method to identify different causes of commutation failures in the High-Voltage Direct Current Transmission (HVDC) system. By using the technique of wavelet multi -resolution analysis (MRA) ,the transient signals generated by the faults are decomposed into different resolution scales. Then , the features of each fault are extracted using the wavelet signal processing methods such as scale energy and scale entropy. Moreover, two auxiliary parameters are defined as the criteria for the identification , and four thresholds are set to distinguish the commutation failures from DC line faults. Simulated results indicate that there exist certain distribution regularities for the scale energy and scale entropy of transient signals with different HVDC faults , and that the criteria based on these regularities can make effective and reliable diagnosis of commutation failures.

Key words: HVDC system, commutation failure, wavelet transform, scale energy, scale entropy, fault diagnosis