分布式接入配网单相接地故障定位适应性分析  

The Adaptability Analysis of Single-phase Fault Location for Distribution Network with Generations

作　　者：黄超艺[1,2] 蔡金锭[1] 李天友[3] 陈彬[4] 张功林[4] 

机构地区：[1]福州大学电气工程及自动化学院,福州350108 [2]国网福建省电力有限公司技术中心,福州350007 [3]国网福建省电力有限公司,福州350003 [4]国网福建省电力有限公司电力科学研究院,福州350007

出　　处：《电气技术》2015年第7期58-62,共5页Electrical Engineering

摘　　要：针对分布式电源并网运行时配电网拓扑发生改变,导致现有故障分析方法适应性变化。通过对比含DG与不含DG的小电流接地系统在发生单相接地时暂态电流的特点,从理论上对原有接地故障识别方法在新的配网网架下的适应性进行重新分析,得出DG的加入对各线路零序电流影响较小,而对其他序分量电流影响较大,则传统基于暂态零序分量的方法仍然使用。最后针对现有暂态定位法导致采样不同步且数据量大等问题,提出利用DA求取检测点近似熵的方法,仿真和现场实际故障数据验证了该算法的有效性。In view of the distributed power grid connected distribution network are resulted topology changes, the existing analysis method of adaptive change. By comparing with contained DG and no DG in the small current grounding system＇s characteristics about the transient current when happened single-phase grounding. Analysis of the original ground fault identification method in the distribution network structure of the new adaptive theoretically in theory, it is concluded that the addition of DG on the zero current impact is small, and had a greater influence of aerial mold current, the traditional positioning method based on aerial model current of reliability will be reduced, and the method of transient zero model component still use. Finally, based on the existing transient method lead to problems such as sampling synchronization and data full est., the result is using DA calculated the approximate entropy method, the simulation and actual failure data are verified the effectiveness of the algorithm.

关 键 词：分布式接入 单相接地 近似熵 

分 类 号：TM862[电气工程—高电压与绝缘技术]