Identification of Permanent Faults and Disturbance Induced by Deicing Based on Permutation Entropy for the Large-Scale Clean Energy Transmission in Winter

Abstract

Ice shedding may induce isolated ground wires’ temporary grounding, which can cause electric quantities of direct current (DC) deicing devices to fluctuate. Hence, the disturbance of ice shedding is able to trigger the protective relay frequently and unnecessarily, which adversely affects the deicing process. Due to the randomness of ice shedding, the grounding resistance varies quickly; thus, the disturbance in poles of deicing devices can be detected multiple times in a short time. Moreover, the permanent fault requires steady arc plasma because of the low output voltage and current of deicing devices, which cannot bring out multiple-time disturbances in the poles. This paper proposes the identification of permanent faults and disturbance induced by deicing based on the permutation entropy, which is verified by a large number of simulations.

Partial Discharge Signal Pattern Recognition of Composite Insulation Defects in Cross-Linked Polyethylene Cables

“…Permutation entropy, introduced by BANDT and POMPE, is used to quantify the degree of randomness in signal sequences. A smaller calculated permutation entropy value indicates that the signal sequence is more stable and regular, whereas a higher value suggests a stronger degree of randomness in the signal sequence [ 22 , 23 ]. Variational modal decomposition is performed for 20 randomly selected sample datapoints for each type of composite defect partial discharge signal, respectively.…”