US 11,988,701 B2
Fault diagnosis method for three-phase power grid, apparatus, and computer device
Wei Yu, Guangdong (CN); Jin Zhao, Guangdong (CN); and Shaohui Li, Guangdong (CN)
Assigned to EAST GROUP CO., LTD., Dongguan (CN)
Appl. No. 17/760,445
Filed by EAST GROUP CO., LTD., Guangdong (CN)
PCT Filed Oct. 14, 2021, PCT No. PCT/CN2021/123771
§ 371(c)(1), (2) Date Aug. 9, 2022,
PCT Pub. No. WO2022/160778, PCT Pub. Date Aug. 4, 2022.
Claims priority of application No. 202110135189.5 (CN), filed on Feb. 1, 2021.
Prior Publication US 2023/0358798 A1, Nov. 9, 2023
Int. Cl. G01R 31/08 (2020.01)
CPC G01R 31/086 (2013.01) [G01R 31/088 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A fault diagnosis method for a three-phase power grid, comprising:
acquiring line voltage values of the three-phase power grid, wherein the line voltage values are collected and sent in real time by a voltage collector connected to a phase line of the three-phase power grid;
obtaining a voltage peak balance degree and a phase angle offset of the three-phase power grid based on the line voltage values and a preset system parameter; and
obtaining a fault diagnosis result based on the voltage peak balance degree and the phase angle offset;
wherein said obtaining a voltage peak balance degree and a phase angle offset of the three-phase power grid based on the line voltage values and a preset system parameter comprises:
performing filtering analysis based on the line voltage values and the preset system parameter to obtain a filtered output line voltage value; and
obtaining a voltage peak balance degree and a phase angle offset of the three-phase power grid based on the filtered output line voltage value.