Single-Phase Ground Fault Location of Distribution Network with DG Based on CEEMD

When a single-phase ground fault occurs in the resonant grounding system, the arc suppression coil only compensates for the power frequency zero sequence current, but has little effect on the non-power frequency zero sequence current. The non-power-frequency zero-sequence currents of faulty lines and sound lines are significantly different in amplitude and polarity. EMD (Empirical Mode Decomposition) and EEMD (Ensemble Empirical Mode Decomposition) decomposition have modal mixing and end effects. The CEEMD (Complete Ensemble Empirical Mode Decomposition) and energy function method are used to numerically analyze the transient non-power frequency zero-sequence current signal, and construct the fault line criterion. To obtain its peak amplitude and polarity, the zero-sequence current detected at the head of each line is decomposed by using the CEEMD method. Then, the energy value of the imf 1 component is calculated after CEEMD decomposition. By comparing the amplitude and polarity of the spikes, and the magnitude of the energy value, the fault line is judged. Simulation results show that the method has a high success rate in line selection and is not affected by various failure factors.