摘要
直流配电网的发展尚处于起步阶段,其中的研究重点之一就是故障测距技术,故障测距技术对于故障线路的维修具有重大意义,而交流配电网的测距技术无法直接移植到直流配电网之中,因此需要新的方法。主要对直流配电系统的故障进行了故障特征的详细分析,依据故障特征应用解析法对单极接地故障提出一种基于参数识别的故障测距方法,本方法是只需要测量一端换流站出口处的电压和电流数据就可以完成测距的单端测距方法。其主要应用电容放电的暂态阶段,推导出含有故障距离和过渡电阻这两个未知参数的参数方程,对所推导出的参数方程通过最小二乘法进行拟和求解。最后通过MATLAB进行双端柔性直流配电网仿真模型的搭建和故障测距程序的编程,完成对此基于参数识别的故障测距方法的验证。
The development of DC distribution network is still in its infancy,and one of the research focuses is fault location technology,which is of great significance for the maintenance of faulty lines.However,the location technology of AC distribution network can not be direct transplanted to DC distribution network,so a new method is needed.The fault characteristics of DC distribution system are analyzed in detail,and a fault location method is put forward based on parameter identification for unipolar ground fault by using analytical method according to fault features.This method is a single-ended location method which only needs to measure the voltage and current data at the exit of one-end converter station.In the transient stage of capacitor discharge,the parameter equations with two unknown parameters,i.e.,fault distance and transition resistance,are derived,and the derived parameter equations are fitted and solved by using the least square method.Finally,the simulation model of double-terminal flexible DC distribution network is built and the fault location program is pro-grammed by using MATLAB,and the verification of the fault location method based on parameter identification is completed.
作者
张利
ZHANG Li(Electric Power Branch,Sinopec Shengli Petroleum Administration Co.,LTD.,Dongying Shandong 257000,China)
出处
《电子器件》
CAS
北大核心
2023年第2期531-541,共11页
Chinese Journal of Electron Devices
基金
中国石化集团胜利石油管理局有限公司科技项目(JR21001)。
关键词
直流配电网
故障测距
参数识别
最小二乘法
DC distribution network
fault location
parameter identification
least square method
