Title:
TWO-LEVEL THREE-PHASE VOLTAGE SOURCE INVERTER BRIDGE ARM OPEN-CIRCUIT FAULT DIAGNOSIS METHOD
Document Type and Number:
WIPO Patent Application WO/2021/184820
Kind Code:
A1
Abstract:
A two-level three-phase voltage source inverter bridge arm open-circuit fault diagnosis method, relating to the technical field of on-line diagnosis. The method comprises: collecting three-phase current data output by an inverter at the current time point, and updating three-phase current vectors; constructing Gram matrixes between every two phases of current vectors according to the three-phase current vectors; calculating feature values and feature vectors of the Gram matrixes to obtain a feature vector matrix, and obtaining the similarity between phase currents according to a ratio of the absolute value of the minimum element to the absolute value of the maximum element in the feature vector matrix; comparing the similarity between the phase currents with a set threshold value, obtaining a feature quantity representing a fault at the current time point, and obtaining an open-circuit fault diagnosis result at the current time point according to the feature quantity. The two-level three-phase voltage source inverter bridge arm open-circuit fault diagnosis method has the advantages of low cost, small calculated amount, high detection speed, and high robustness, provides a basis for fault-tolerant control of a motor driving system, and improves the reliability of the system.
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Inventors:
ZHAO JIN (CN)
ZHOU YANG (CN)
SONG YUJIN (CN)
ZHOU YANG (CN)
SONG YUJIN (CN)
Application Number:
PCT/CN2020/131801
Publication Date:
September 23, 2021
Filing Date:
November 26, 2020
Export Citation:
Assignee:
UNIV HUAZHONG SCIENCE TECH (CN)
International Classes:
G01R31/54; G01R31/56
Foreign References:
| CN111381188A | 2020-07-07 | |||
| CN106124913A | 2016-11-16 | |||
| CN106124914A | 2016-11-16 | |||
| CN108680818A | 2018-10-19 | |||
| CN103701394A | 2014-04-02 | |||
| KR20170090149A | 2017-08-07 |
Other References:
SHI, YI ET AL.: "Fault Diagnosis Method of Converter Based on Kernel Density Estimation Classifier", POWER SYSTEM TECHNOLOGY, vol. 43, no. 6, 30 June 2019 (2019-06-30), pages 2204 - 2210, XP055851782, ISSN: 1561-0330
Attorney, Agent or Firm:
HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY PATENT AGENCY CENTER (CN)
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