Distribution Network Fault Location Method Based On EWT-AOE_SD With Section Optimization Equation

Accurate fault localization is difficult to achieve by the complex structure of distribution networks, numerous branches and the penetration of a large number of distributed energy sources. In order to solve the problem of accurate single-phase grounding fault localization in distribution networks, a fault localization method is proposed based on EWT-AOE_SD with section optimization equation. The empirical wavelet transform and analytic energy operator of symmetrical differencing (EWT-AOE_SD) are used to calibrate the travelling wave head, and the single-ended ranging equation is used to calculate the fault distance. On the basis of single-ended ranging, the section optimization equation is constructed, solve the equations using the whale swarm optimization algorithm, and the section with the smallest calculated value is the fault section, while the optimal solution of the equation also reflects the fault distance. The method does not require the travelling wave detection device to keep the clock synchronous, eliminating the effect of synchronization error. The simulation results of MATLAB proved that this method has high accuracy.