文章摘要
束洪春,李一凡,田鑫萃,等.基于交叉重叠差分变换关联性分析的配电网故障选线[J].电力系统自动化,2019,43(6):137-144. DOI: 10.7500/AEPS20180812010.
SHU Hongchun,LI Yifan,TIAN Xincui, et al.Distribution Network Fault Line Selection Based on Sequential Overlapping Derivative Transform Correlation Analysis[J].Automation of Electric Power Systems,2019,43(6):137-144. DOI: 10.7500/AEPS20180812010.
基于交叉重叠差分变换关联性分析的配电网故障选线
Distribution Network Fault Line Selection Based on Sequential Overlapping Derivative Transform Correlation Analysis
DOI:10.7500/AEPS20180812010
关键词: 谐振接地系统  单相接地故障  交叉重叠差分变换  零序电压梯度和  故障选线
KeyWords: resonant grounding system  single-phase-to-ground fault  sequential overlapping derivative transform  zero sequence voltage gradient summation  fault line selection
上网日期:2019-01-23
基金项目:国家自然科学基金资助项目(51667010)
作者单位E-mail
束洪春 昆明理工大学电力工程学院, 云南省昆明市 650051  
李一凡 昆明理工大学电力工程学院, 云南省昆明市 650051  
田鑫萃 昆明理工大学电力工程学院, 云南省昆明市 650051 1105479731@qq.com 
方毅 云南电网有限责任公司, 云南省昆明市 650200  
摘要:
      线缆混合线路的谐振接地系统的自由振荡频率一般在300~3 000 Hz之间,且故障初期,配电网暂态信息丰富,交叉重叠差分(SOD)变换能反映零序电流的暂态特征,因而提出基于SOD变换关联性分析的单相接地故障选线方法。结合零序电压梯度和作为选线的启动,提高了选线的灵敏性及快速性。通过小波变换提取出暂态零序电流0~2.5 kHz频带的信息,并对其作SOD变换。经SOD变换后,增大了健全线路之间的相似性以及健全线路与故障线路之间的差异,故对SOD变换的结果进行关联性分析。通过关联性分析形成故障线路判别矩阵,若故障线路判别矩阵中全为“1”则为母线故障,否则判别矩阵中“-1”所对应的线路即为故障馈线。仿真表明,该方法有效性几乎不受故障的初始角度、过渡电阻和故障位置的影响,选线结果准确、可靠。
Abstract:
      In a resonant grounding system, the free-oscillation frequency of the cable-overhead line is typically between 3 00 and 3 000 Hz. In the initial stage of the fault, the transient information of the distribution network is rich, and the sequential overlapping derivative(SOD)transform can reflect the transient characteristic of the zero-sequence current. Therefore, the single-phase-to-ground fault line selection method based on SOD transform correlation analysis is proposed. And combined with the zero sequence voltage gradient summation as the starting criterion, the sensitivity and rapidity of the fault line selection are improved. The information of the transient zero-sequence current in the 0~2. 5 kHz band is extracted by wavelet transform and SOD transform is conducted. After the SOD transform, the similarity between the healthy lines is improved and the difference between the fault line and healthy lines is increased. Therefore, the correlation analysis of the results of the SOD transform is performed to form a fault line discrimination matrix. If the fault line discriminant matrix is all “1”, it is judged that the bus is faulty; otherwise, the line corresponding to“-1” is the fault line. The simulation shows that the method is almost independent of the initial phase angle, transition resistance and fault location, and the line selection result is accurate and reliable.
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