双极直流输电线路暂态高频小波能量保护  

Bipolar DCTransmission Line Transient High Frequency Wavelet Energy Protection

作　　者：金恩淑[1] 马仲涛[2] 夏国武[3] 许晶[1] 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]安徽省电力公司蚌埠供电公司,安徽蚌埠233000 [3]国网通辽供电公司,内蒙古通辽028000

出　　处：《东北电力大学学报》2017年第2期14-18,共5页Journal of Northeast Electric Power University

摘　　要：随着高压直流输电的推广,针对直流系统的保护配置也在不断改进。直流线路作为直流输电系统的核心元件,其保护配置一直是研究重点。本文利用小波变换提取故障暂态时电压高频信号,通过检测电压高频信号小波能量突变量的大小及比较正负极小波能量的大小,提出一种直流输电线路的全线速动保护新方法。该方法原理简单、动作迅速、耐过渡电阻能力强。利用PSCAD搭建仿真模型,对各种类型故障进行仿真,结果表明,该保护具有绝对的选择性,能有效可靠保护直流线路全长。With the development of HVDC,the protection configuration of DC system has been improved. As DC lines are the core component of HVDC transmission system,the protection configuration has been the focus of the study. Here uses wavelet transform to extract high frequency voltage transient signal of the fault.According to detect high frequency voltage wavelet mutation size and comparise of positive and negative wavelet energy,this paper put forward a new method of HVDC transmission line across the quick-acting protection.The principle of this method is simple,quick and resistance.Use PSCAD to build a simulation model and simulate various types of fault.The results show that the protection has absolute selectivity and can reliable protecte the DC lines.

关 键 词：直流输电 高频信号 暂态保护 小波变换 

分 类 号：TM721.1[电气工程—电力系统及自动化]