摘要
针对传统直流线路主保护存在灵敏度不足、可靠性差等问题,基于现有直流输电工程控制保护平台硬件设备及软件环境,研究开发了仅利用单端暂态信号的新型直流输电线路主保护装置。保护原理基于直流输电线路边界对高频电压信号的阻隔特性,由启动元件、暂态量方向元件、边界元件、故障极判别元件、雷击干扰判别元件组成。利用实际直流输电工程进行二次系统调试时所采用的RTDS仿真模型及现场控制保护设备,对直流输电线路单端暂态量保护装置进行了直流输电控制与保护系统出厂试验中所有线路保护项目试验,结果表明,直流输电线路单端暂态量保护装置能够准确、快速区分线路区内外故障及雷击干扰,适用于不同直流输电工程,并且保护原理可靠、计算量小、无需更换门槛值,有很强的实用性。
To solve the problems existing in traditional main protection for transmission lines,such as insufficient sensitivity and poor reliability,the novel non-unit main protection device based on transient signals for high voltage direct current（HVDC） transmission lines was developed on the present HVDC control and protection platform hardware and software.The protection scheme for HVDC transmission lines is based on the attenuation characteristics of line boundary for high frequency voltage signals and is composed of starting unit,transient signal based directional unit,boundary unit,lightning disturbance identification unit and fault-pole identification unit.All commissioning tests for control and protection systems of HVDC transmission lines were performed on the transient signal based protection device,which used control and protection devices,and RTDS simulation models for actual HVDC secondary system commissioning.The results show that the protection device can accurately identify internal faults,external faults and lightning disturbance at high speed,and is suitable for different HVDC projects.The protection principle is reliable and the amount of calculation is small;besides,the threshold values of each unit do not need to be changed when applied to different HVDC projects and the protection is feasible.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第4期179-185,24,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50977074)~~
关键词
高压直流
输电线路
保护装置
暂态量保护
单端量
技术开发
high voltage direct current（HVDC）
transmission lines
protection devices
protection based on transient signals
non-unit quantity
technical development
