Circuit model and Euclidean distance-based short-circuit fault positioning method for annular direct-current micro-grid

• Main Authors: JIA YONG, LUO JIAN, FENG BO, LUO YONGJIE, WANG QIANGGANG, ZHONG JIAYONG, LI XINGLONG, YANG YI
• Format: Patent
• Language: Chinese; English
• Published: 08.09.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an annular DC micro-grid short-circuit fault positioning method based on a line model and an Euclidean distance. The method comprises the following steps: establishing a system mathematical model for an annular DC micro-grid to be subjected to fault positioning; acquiring the sampling current of the line through intelligent electronic equipment or a current sensor; a combination scheme of a large number of fault resistors and fault positions is obtained in a random generation mode; after a fault scheme is generated, calculating a transient fault current through the established system mathematical model; the correlation between the currents is obtained through analysis by calculating the Euclidean distance between the transient fault current and the sampling current; judging whether a correlation threshold value is met or not: setting a judgment threshold value as k1, determining a fault scheme when the calculated correlation coefficient is greater than k1, and outputting a fault positi