摘要
针对配网线路中大量电缆线路的使用导致故障线路与健全线路零序电流差异小的问题,提出一种基于线路自身工频与特征频率上的零序导纳相角差的故障选线新方法。在分析线路特征频率的基础上,利用S变换提取直流与特征频段内整倍工频频率点幅值信息,通过比较两部分幅值大小判断故障合闸角范围。基于特征频段内频率点幅值最大原则确定故障系统零序电流的特征频率,并进一步分析线路工频与特征频率下零序导纳向量特性。最后提出利用故障线路、健全线路的工频与特征频率零序导纳角差相差180°构建判据。基于Matlab的仿真验证本选线方法具有良好的选线效果。
To solve the problem that the use of a large number of cable lines in the distribution line leads to a small difference between the fault line and the sound line zero-sequence current,this paper proposes a new way of fault line selection based on the phase difference between the power frequency and the characteristic frequency.On the basis of analyzing the characteristic frequency of the line,the S-transform is used to extract the amplitude information of the euploid power frequency point in the DC and characteristic frequency bands,and the range of the fault closing angle is judged by comparing the magnitudes of the two parts.The characteristic frequency of the zero-sequence current of the fault system is determined based on the principle of the maximum frequency point amplitude in the characteristic frequency band,and the characteristics of the zero sequence admittance vector are further analyzed under the power frequency and the characteristic frequency.Finally,it proposes to use that the zero-sequence admittance angle difference between the power frequency and the characteristic frequency between the fault line and the normal line is 180°to construct criterion.Based on the simulation verification of Matlab,this line selection method has a good line selection effect.
作者
李振兴
王新
王朋飞
李飞
翁汉琍
LI Zhenxing;WANG Xin;WANG Pengfei;LI Fei;WENG Hanli(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China;Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station,Yichang 443002,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2019年第12期13-21,共9页
Power System Protection and Control
基金
国家自然科学基金项目资助(51607106)
湖北省教育厅科学技术研究计划重点项目资助(Z2017037)
三峡大学学位论文培优基金项目资助~~
关键词
故障选线
特征频率
S变换
零序导纳
角差
fault line selection
characteristic frequency
S-transform
zero-sequence admittance
phase angle difference
