Method for diagnosing local overheating fault of doubly fed asynchronous generator

A double-fed asynchronous and local overheating technology, which is applied in the field of drive motor state detection and fault diagnosis, can solve the problem of low precision of temperature analysis methods, and achieve the effect of convenient and feasible site layout, strong pertinence, and strong reliability

Inactive Publication Date: 2018-05-08
HOHAI UNIV
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Problems solved by technology

[0005] Considering that the accuracy of the above temperature analysis methods is not high, it is still not possible to reflect the global temperature field of the brush slip ring system in a stable, real-time and accurate manner.

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  • Method for diagnosing local overheating fault of doubly fed asynchronous generator
  • Method for diagnosing local overheating fault of doubly fed asynchronous generator
  • Method for diagnosing local overheating fault of doubly fed asynchronous generator

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] A method for diagnosing a local overheating fault of a doubly-fed asynchronous generator, comprising the following steps:

[0033] Step 1: build a local overheating fault diagnosis system for double-fed asynchronous generators, the system includes: a conversion interface for converting vibration signals into current signals, a data acquisition instrument, a data analysis module, eight vibration sensors and a current transformer; The vibration sensor is arranged inside the double-fed asynchronous generator, and the current transformer is arranged at the rotor winding of the double-fed asynchronous generator.

[0034] Step 2: Set the sampling frequency of the data acquisition instrument to 10kHz, the number of sampling points to 4000, and set the load current of the rotor winding of the doubly-fed asynchronous generator to 70% to 100% of the rated current.

[003...

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Abstract

The invention discloses a method for diagnosing a local overheating fault of a doubly fed asynchronous generator. First, vibration sensors are placed on the surface of the brush and slip ring of a laboratory doubly fed induction generator according to the brush and slip ring system vibration method principle and the vibration propagation path to sense the vibration signals of the system during operation in real time; then, a data collector collects the vibration signals detected by the vibration sensors, and uploads the vibration signals to a principal computer; and finally, the principal computer stores the vibration signals and performs calculation on the vibration signals, and judges and locates a fault by using the 937.5-1562.5Hz signals in the vibration signals. The fault diagnosis method of the invention is accurate and effective, and has high diagnosis accuracy.

Description

technical field [0001] The invention relates to a local overheating fault diagnosis method of a doubly-fed asynchronous generator, which belongs to the technical field of state detection and fault diagnosis of a driving motor. Background technique [0002] The brush slip ring system is an important dynamic-static conversion device for large-scale doubly-fed asynchronous wind turbines, and plays a vital role in the stable operation of the generator. However, the unstable operation of the generator caused by the local overheating failure of the slip ring device frequently occurs, resulting in huge economic losses. Therefore, it is urgent to study the local overheating diagnosis method of the motor slip ring device. [0003] The main reasons for the local overheating of the slip ring in actual work are as follows: Since there are many brushes evenly distributed on the surface of the slip ring of the doubly-fed asynchronous wind turbine, the change of the contact resistance bet...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 马宏忠李思源张艳刘宝稳徐艳
Owner HOHAI UNIV
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