基于直觉模糊集的单相接地故障综合选线方法

An Intuitionistic Fuzzy Set Based Synthetical Approach of Faulty Line Selection for Single-Phase Ground Fault

小电流接地系统单相接地故障的情况复杂,且影响接地选线准确性和可靠性的因素较多。为了更充分地利用故障的信息,弥补传统模糊综合选线方法不能完整表达故障选线全部信息的不足,提高选线的成功率,提出了基于直觉模糊信息集成的综合选线方法。首先根据接地故障零序电流的特征确定故障特征隶属度和非隶属度,然后依据接地故障类型确定综合选线法中各方法的权重系数,在此基础上建立了基于直觉模糊信息集成的综合选线方法模型,并在10 kV高压实验室进行了模拟单相接地故障实验,用MATLAB软件编程处理得到的故障录波数据,选线结果表明该方法能对各种类型的单相接地故障准确选线,并能克服单一选线方法造成误选的不足。

The condition accompanying with single-phase to ground fault occurred in small current neutral grounding system is complex, meanwhile there are many factors influencing the accuracy and reliability of faulty line selection. To utilize fault information more adequately and remedy the defects that fault line selection method based on traditional fuzzy theory cannot express all the fault information, an intuitionistic fuzzy set based synthetical approach of faulty line selection is proposed to improve the success rate of the selection. Firstly, based on the zero-sequence current characteristics of grounding fault, the membership and nonmembership of fault features are determined; then according to the type of grounding fault, the weight coefficient of each method consisting of the synthetical approach of faulty line selection is determined; on this basis, an intuitionistic fuzzy set based synthetical model of faulty line selection is built. A lot of experiments to simulate single-phase to ground fault are performed in a 10 kV high voltage laboratory, and the obtained recorded fault data is processed by program based on Matlab software. The results of faulty line selection show that the proposed method can carry out correct faulty line selection for various types of single-phase to ground fault and the deficiency caused by single fault line selection method can be overcome.