Small current grounding fault line selection method and system based on sparse representation

• Main Authors: GUO CHANGLIN, SUN XIANGRAN, SUN GANG, WU QINGBO, WANG SHANQING, LI ZHONGKAI, ZHANG PENG, WANG YUJIANG, CHEN YU, QIN PENGFEI, HAO GUODONG, GAO CHENGCHENG, ZHENG WENXIN, QUAN CHAO
• Format: Patent
• Language: Chinese; English
• Published: 29.11.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS; TESTING

The invention discloses a small current grounding fault line selection method and system based on sparse representation, and the method comprises the steps: obtaining the three-phase voltage data and zero-sequence voltage data of a bus; performing sparse representation on the three-phase voltage data and the zero-sequence voltage data by using an adaptive dictionary sparse decomposition method to obtain maximum sparse coefficients of the three-phase voltage and the zero-sequence voltage; judging whether the system has a single-phase earth fault or not based on the maximum sparse coefficient; if a single-phase fault occurs, zero-sequence current data of the n feed-out lines are obtained, sparse representation is carried out on the zero-sequence current data by adopting an adaptive dictionary sparse decomposition method, the maximum sparse coefficient of the zero-sequence current of each feed-out line is obtained, and a line corresponding to the maximum value in the maximum sparse coefficient of the zero-sequen