Single and Double Side Traveling Wave Positioning Method Based on EMD and Quadratic Polynomial Fitting

Accurate fault location of transmission line is an important guarantee to ensure the safe and stable operation of power system.For the calibration of the reflection wave head in the single ended traveling wave method, a method based on EMD is proposed.Preliminary fault location method with double end was applied and the estimate of the probable time to reflect wave arrived at measuring point in order to accurately identify reflection wave head was carried out.Finally, the single-ended method was adopted for positioning calculation.In view of the location error of the traditional fault location within a sampling interval, the two-order polynomial fitting algorithm based on least square method is proposed to calibrated points of the traveling wave arrival time.By the accurate calibration of all time points, the positioning error caused by the sampling interval is decreased.Results of ATP and MATLAB fault location simulations verify the method based on EMD and the two polynomial fitting, which can guarantee the reliability, and can get high positioning accuracy.