摘要
风电场集电线路大多包含多个分支,且一般只在线路首端设置测量装置,若故障后基于该装置进行单端故障定位,则只能在不同分支上得到多个疑似故障点,无法确定实际故障位置。当前基于多端量的算法虽然能够准确定位故障,但需要增设的测量装置过多,成本过高。文中针对最常见的单相接地故障,分析了集电线路拓扑,指出当故障位于不同分支时,单端测量装置可能采集到相同的数据,因而仅依靠单端电气量无法确定故障分支,有必要增设测量装置以实现故障分支定位。为降低定位成本,在不同结构的线路上确定故障分支所需要增设的测量装置最小数量及位置。随后,结合新增测量信息与现有单端法,提出一种根据多端故障录波信息定位故障分支并实现故障测距的算法。最后,通过PSCAD/EMTDC仿真验证了文中方法的有效性和实用性。该算法改进自单端阻抗法,解决了故障分支定位问题,且在当前配置基础上增加少量测量装置即可实现,成本较低,具有较好的工程应用前景。
Collector lines in wind farms mostly contain multiple branches,and generally only one measuring device is set at the head of the line.If single-end fault locating is carried out based on the device after a fault,only multiple suspected fault points can be obtained on different branches,and the actual fault branch cannot be determined.Although the current multi-terminal algorithm can locate the fault branch,the number of measuring devices required is too much,which is expensive.In this paper,the topological structure of a collector line is analyzed under the most common single-phase grounding fault.It is pointed out that when faults occur on different branches,the same data may be collected by the single-end measuring device,making the fault branch cannot be identified only by the single-end electrical volume,so it is necessary to add measuring devices to identify the fault branch.In order to reduce the investment,the minimum number and location of additional measuring devices required to identify the fault branch on lines with different topologies are determined.Combined with the new measurement information and the existing single-terminal method,an algorithm is proposed to locate the fault branch and achieve fault location based on multi-terminal fault recording information.The effectiveness and practicability of the proposed method are verified by PSCAD/EMTDC simulation.The proposed algorithm is improved from the single-terminal impedance method to solve the problem of fault branch location,and it can be realized by adding a few measuring devices on the basis of the current configuration.The cost is low,which means a good engineering application prospect.
作者
李永丽
辛双乔
李涛
卢扬
LI Yongli;XIN Shuangqiao;LI Tao;LU Yang(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)
出处
《电力工程技术》
北大核心
2022年第5期2-11,共10页
Electric Power Engineering Technology
基金
国家自然科学基金资助项目(U2066210)。
关键词
风电场
多分支线路
单相接地故障
故障定位
区段判定
阻抗测距
wind farm
multi-branches line
single phase grounding fault
fault location
section determination
impedance location
