基于模糊理论的配电网多判据融合故障选线方法研究

Research on Multi-criteria Fusion Strategy of Fault Line Selection in Distribution Network based on Fuzzy Theory

配电网的单相接地故障选线问题一直都没有得到很好的解决,而单一选线方法会因故障特征和外界干扰的影响,存在动作死区和使用局限性。本文利用模糊理论将具有互补性的基于高频模态能量的故障选线方法、基于5次谐波分量的故障选线方法和基于衰减直流分量的故障选线方法进行智能融合,实现了基于模糊理论的多判据融合故障选线。仿真实验证明该融合故障选线方法能够适用于小角接地故障、高阻接地故障、线路末端故障、电弧性接地故障等不利于实现选线的故障,且该方法具有较高的准确度和可靠性。

The problem of single line to ground fault doesn't be sovled well. Single line selection method for fault characteristics and the influence of outside interference lead to dead zone and limitation. In this paper, on the basis of fuzzy theory method, the energy method which has been improved and 5 times harmonic method is combined with wavelet analysis in order to improve the fault line selection method in line accordance with the complementary of each other. Through simulation and experiment, The method is suitable for the small Angle ground fault, high resistance grounding fault, line-terminal fault, arc grounding fault and unfavorable to achieve the fault line selection. the proposed method has better accuracy and applicability.