基于广义S变换能量相对熵的小电流接地系统故障区段定位方法

发布时间：2018-05-28 16:50

本文选题：小电流接地系统 + 故障区段定位　；参考：《电工技术学报》2017年08期

【摘要】：小电流接地系统发生单相接地故障后,系统中产生特征较为丰富的电气暂态量。针对健全区段两端的暂态零序电流相似度高,而故障区段两端暂态零序电流差异较大的特点,提出一种基于暂态零序电流的广义S变换能量相对熵的故障区段定位方法。首先,以暂态零序电流作为故障特征量,根据零序电流突变量确定各检测装置上传数据的起始时刻。然后,对馈线上各装置上传的暂态零序电流进行广义S变换,得到其时频矩阵。最后,利用能量相对熵表征各区段两端信号的差异,通过计算比较,确定熵值最大的区段为故障区段。该区段定位方法适用于不同故障点位置、不同故障角、不同过渡电阻情形下的故障定位,仿真结果验证了所提方法的有效性。
[Abstract]:After the single-phase grounding fault occurs in the small current grounding system, there are abundant electrical transient quantities in the system. In view of the high similarity of transient zero-sequence current between the two ends of the perfect section and the large difference of transient zero-sequence current between the two ends of the fault section, a fault section location method based on the generalized S-transform energy relative entropy of transient zero-sequence current is proposed. Firstly, the transient zero-sequence current is used as the fault characteristic, and the starting time of the data is determined according to the zero-sequence current mutation. Then, the transient zero-sequence current uploaded from the feeder is transformed by generalized S-transform, and the time-frequency matrix is obtained. Finally, the energy relative entropy is used to characterize the difference of the signals between the two ends of each section. Through the calculation and comparison, it is determined that the section with the largest entropy value is the fault section. The section location method is suitable for fault location with different fault points, different fault angles and different transition resistances. The simulation results show that the proposed method is effective.
【作者单位】：中国电力科学研究院;北京科技大学自动化学院;河北大学电子信息工程学院;
【基金】：国家电网公司科技项目“智能配电网运行状态管控与综合评价关键技术研究”资助(PD-71-16-014)
【分类号】：TM862

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