Research on Grounding Line Selection Method by Combining Steady-state and Transient Characteristics
Single-phase grounding fault is the fault with the highest probability in distribution network operation,but the elec-trical fault characteristics is weak and large external interferences exist when grounding happened,and it is difficult to choose grounding line for distribution network.In this paper,a grounding line selection method of distribution network based on the fusion of steady-state and transient fault characteristic parameters is proposed.The difference in amplitude and phase of the fifth harmonic component of capacitance current mutation of ground fault line and non-fault line is analyzed,the empirical wave-let transform is used to extract the comprehensive correlation coefficient of low frequency component and the relative weight co-efficient of high frequency component of fault zero-sequence current,and fuzzy neural network is used to realize the nonlinear mapping diagnosis of fusion feature and fault.It establishes grounding fault simulation model of distribution network,the effec-tiveness and superiority of the proposed method are verified by the comparison of line selection under multiple interference.
distribution networkground fault line selectionwavelet transformfuzzy neural network
万方数据
维普
