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交直流交叉跨越碰线故障及其保护风险分析
作者:
作者单位:

1.华南理工大学电力学院,广东省广州市 510640;2.广州供电局有限公司,广东省广州市 510620;3.中国南方电网电力调度控制中心,广东省广州市 510623

作者简介:

通讯作者:

基金项目:

国家自然科学基金资助项目(51777079);国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U1766213)。


Touching Fault and Its Risk Protection Analysis for AC/DC Crossed Transmission Lines
Author:
Affiliation:

1.School of Electric Power, South China University of Technology, Guangzhou 510640, China;2.Guangzhou Power Supply Co., Ltd., Guangzhou 510620, China;3.Power Dispatching and Control Center of China Southern Power Grid, Guangzhou 510623, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51777079) and National Natural Science Foundation of China-State Grid Joint Fund for Smart Grid (No. U1766213).

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    摘要:

    中国直流输电工程输送距离长、跨度大,与交流线路跨越的情况日益增多。电网出现了新的故障形式——交直流碰线故障,其故障特征及对继电保护的影响研究比较匮乏。对碰线故障的特征进行理论分析,基于详细直流工程PSCAD/EMTDC仿真平台搭建交直流同塔模型,对碰线故障引起的特征量及其影响因素进行研究,并分析其对交直流保护动作特性的潜在挑战。仿真结果表明:碰线故障引入的工频分量会使直流线路行波保护动作率降低;行波保护与交直流碰线保护在保护配合范围内存在动作死区;交流距离保护灵敏度下降。

    Abstract:

    The DC transmission projects in China have long transmission distance and large span, and the crossing between AC lines and DC lines is increasing day by day. The power grid presents new fault type, that is touching fault for AC/DC transmission lines. There is lack of fault characteristics for touching fault and their influence on relay protection. Theoretical analysis on characteristics of touching fault for AC/DC transmission lines is made. AC/DC tower model is developed based on PSCAD/EMTDC simulation platform of detailed DC project. The characteristic quantities and key factors caused by touching fault are investigated, and potential challenges of which on operating characteristic of AC/DC protection are analyzed. Simulation results show that the fundamental frequency component introduced by touching fault can reduce the action rate of traveling wave protection for DC lines, there is a action dead zone in protection range between traveling wave protection and touching protection for AC/DC lines, and the sensitivity of AC distance protection is lower.

    表 1 故障点的电气量约束Table 1 Electrical quantity constraints at fault point
    表 3 Table 3
    表 5 Table 5
    表 2 Table 2
    表 4 Table 4
    图1 交直流碰线不接地故障的电流分布Fig.1 Current distribution under touching ungrounded fault for AC/DC transmission lines
    图2 交直流碰线接地故障存在过渡电阻的等效电路Fig.2 Equivalent circuit with transition resistance of touching grounded fault for AC/DC transmission lines
    图3 直流分量特征Fig.3 Characteristics of DC components
    图4 不同直流功率下的50 Hz特征量Fig.4 50 Hz components in different DC powers
    图5 不同电压等级下的50 Hz特征量Fig.5 50 Hz components in different voltage levels
    图6 不同过渡电阻下的50 Hz特征量Fig.6 50 Hz components in different transition resistances
    图7 故障时刻对电压变化量的影响Fig.7 Influence of fault occurring time on voltage variation
    图8 行波保护及碰线保护的动作区间Fig.8 Action interval of traveling wave protection and touching line protection
    图 碰线故障下直流功率对差动量及制动量的影响Fig. Influence of DC powers on differential current and braking current
    图 碰线故障的零序等效网络Fig. Zero sequence equivalent network for TL fault
    图 碰线故障下直流功率对零序电流的影响Fig. Influence of DC powers on zero sequence current
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引用本文

李晓华,梁子鹏,冯家伟,等.交直流交叉跨越碰线故障及其保护风险分析[J].电力系统自动化. DOI:10.7500/AEPS20190310003.

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  • 收稿日期:2019-03-10
  • 最后修改日期:2020-01-19
  • 录用日期:2019-09-08
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