基于多频带多特征融合的配电网单相接地故障选段方法OA

Aiming at the existing distribution network single-phase-to-ground fault section location method,which has problems such as heavy communication burden,difficulty in threshold setting,and a single amount of fault features,a distribution network single-phase-to-ground fault section location method based on multi-frequency band and multi-feature fusion is proposed.Firstly,the wavelet packet transform is used to decompose and reconstruct the derivative of the zero-sequence voltage and the zero-sequence current of the first half of the industrial frequency cycle after the fault,respectively,to obtain the different frequency band components of the original waveform.Secondly,the volt-ampere characteristic eigenvectors and zero-sequence power cumulative sum are introduced as fault characteristics according to the polarity relationship,respectively.Finally,the feature bands are screened and the section location criterion based on the fusion of feature bands and fault features is constructed.Simulation experiments and field data validation results show that the proposed method can effectively realize the threshold-free in local section location of single-phase-to-ground fault.