Wind power converter IGBT device open-circuit fault comprehensive diagnosis method

A technology for wind power converters and open-circuit faults, applied to fault locations, measuring electrical variables, instruments, etc., can solve problems such as difficult identification of multiple fault types, fixed threshold parameters, etc., and achieve online diagnosis and reduce misdiagnosis rates.

Pending Publication Date: 2021-04-09
CHONGQING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The voltage signal is easy to realize fast early warning of faults, but it is difficult to identify multiple fault types, while the current signal is easy to realize converter fault identification, but there is a problem of fixed threshold parameters

Method used

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  • Wind power converter IGBT device open-circuit fault comprehensive diagnosis method
  • Wind power converter IGBT device open-circuit fault comprehensive diagnosis method
  • Wind power converter IGBT device open-circuit fault comprehensive diagnosis method

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Embodiment Construction

[0049] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0050] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to a wind power converter IGBT device open-circuit fault comprehensive diagnosis method, and belongs to the field of electronic devices. The method comprises the following steps: S1, analyzing the influence of the IGBT open-circuit fault of the machine-side converter on the voltage of a direct-current bus; S2, realizing fault DC bus voltage online diagnosis based on a cumulative sum algorithm according to distribution characteristics of DC bus voltages before and after a machine-side converter IGBT open-circuit fault; S3, calculating a normalized average value and an absolute average value of the output current of the converter, and analyzing normalized absolute average value characteristics of the output current of different open-circuit fault types to design a fault identification threshold; S4, based on comparison of the fault identification characteristic quantity and a threshold value thereof, establishing a decision function for doubly-fed wind motor side converter IGBT open-circuit fault positioning. According to the method, online diagnosis of the IGBT open-circuit fault of the doubly-fed wind motor side converter can be realized, and fault positioning can also be realized.

Description

technical field [0001] The invention belongs to the field of electronic devices, and relates to a comprehensive diagnosis method for open-circuit faults of IGBT devices of wind power converters. Background technique [0002] In recent years, wind turbines based on doubly-fed induction generators have been one of the most popular types of wind turbines due to their advantages such as adjustable power, independent control, and flexible grid connection. However, the high failure rate and operation and maintenance cost of the converter restrict its development. The faults of wind power converters are usually two kinds of faults: short circuit and open circuit. The fault time of the former is very short (generally less than 10μs) and it is difficult to diagnose the fault directly. Faults are usually in the open-circuit fault mode. At present, the probability of single-tube and double-tube open-circuit faults in wind power converters is relatively high. resulting in a higher fai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/54
CPCG01R31/088G01R31/54Y04S10/52
Inventor 李辉杨甜谭宏涛周芷汀谢翔杰姚然赖伟周柏灵何蓓
Owner CHONGQING UNIV
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