基于多时间断面信息的T接风电场并网线路单相接地故障单端测距研究

项目名称： 基于多时间断面信息的T接风电场并网线路单相接地故障单端测距研究

项目编号： No.51477084

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 王宾

作者单位： 清华大学

项目金额： 79万元

中文摘要： 受风资源分布等因素影响，风电场T接并网输电线路广泛应用；具备低穿能力的风电场侧不安装保护，无实时量测数据，且并网线路故障后风场侧电气量受频率影响量测误差大，多端时钟同步保持困难，传统基于多端同步的故障测距方法无法适用，严重制约着风电场并网线路的快速修复；针对该问题，项目提出仅立足于系统侧信息，基于永久性接地故障单相切除前后输电线路拓扑结构保持不变的实际，利用故障后系统侧延时跳闸，主动控制T接风电场侧断路器故障相依次跳闸，而产生的多时间断面信息，研究故障分支定位与单端阻抗测距算法；利用故障发生、风场侧断路器重合闸而产生的行波源多时间注入与折反射特征，研究单端行波测距算法；最终基于分布参数线路模型，综合阻抗法的稳定性与行波法的精确性，研究单端实用化组合算法；研制测距装置，通过功能与型式试验测试；项目充分挖掘多时间断面故障信息的内在耦合性，理论成果可推广到配电网中应用，理论意义与实用价值并重。

中文关键词： 继电保护；故障测距；输电线路；单相接地故障

英文摘要： Multiple-terminal transmission lines are widely used in power system with wind farm connections due to the limitaiton of wind sources dsitribution and some other factors. Fault location technique based on synchronous mutiple-end information is usually adopted in traditional multiple-end lines. But this type algorithm cannot be used in wind farms' T-connection line since the real-time information at wind farms is unavailble, and metered power components are usually polluted with large errors caused by frequency variation after fault. In response to this problem, a novel single-end fault location algorithm is researched in this project with only using the information at power system side. It is based on the fact that, the topology of transmission line keeps constant at multiple time-sections: time at fault occurrence, and those after multiple-terminal fault phase circuit breaker trippings. Hence, firstly, multiple time-sections information will be used to identify fault branch and to calculate fault distance based on impedance algorithm. After that, a novel travelling wave based fault location algorithm will also be researched using the relationships of travelling waves refractions and reflections, which are originated from the occurance of fault and sequent operations of circuit breakers. After that, a combined fault location algorithm will also be researched based on the distributed parameters transmission line model to couple single-end impedance location and travelling wave location algorithms.The location deveice will be developed and promised to pass the functional and EMC tests. The most valuable theory innovation in this project is the digging of inherent characerristics using multi-time section information to fault phenomenon, which can also be extended to the practical applications in distribution system.

英文关键词： Relay protection;Fault location;Transmission line;Single line to ground fault