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Burn fault diagnosis method for slip ring of generator brush

A brush slip ring and fault diagnosis technology, which is applied in the direction of instruments, simulators, control/regulation systems, etc., can solve the problems of poor operability and low accuracy of brush slip ring fault diagnosis, and achieve operability Strong, effective diagnosis results, and avoid external interference

Inactive Publication Date: 2017-12-22
HOHAI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a generator brush slip ring burn fault diagnosis method, and solve the technical problems of low accuracy and poor operability of the brush slip ring fault diagnosis in the prior art

Method used

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  • Burn fault diagnosis method for slip ring of generator brush
  • Burn fault diagnosis method for slip ring of generator brush
  • Burn fault diagnosis method for slip ring of generator brush

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Embodiment Construction

[0034] In the present invention, the two situations of normal surface of generator brush slip ring and burnt surface of single-phase slip ring are considered. Based on the Hilbert-Huang transform theory, a method for diagnosis of generator brush slip ring burn fault is proposed. pretreatment measures. For double-fed asynchronous fan with brush slip ring burn fault, this method uses PSCAD / EMTDC power system simulation software to simulate the slip ring burn fault; then based on the HHT transformation theory, the fault phase excitation current before and after the fault is processed to find out the fault characteristic quantity ;Finally, the system experiment platform is built to measure the excitation current signal, and the Hilbert spectrum is used to process and analyze the excitation current flowing through the slip ring. The periodic high-frequency component is used as the basis for judging whether the slip ring has a burn fault, and the comparison with the simulation resul...

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Abstract

The invention discloses a burn fault diagnosis method for a slip ring of a generator brush, and the method comprises the steps: simulating a slip ring burn fault through simulation software, carrying out the processing of a fault phase excitation current before and after the fault based on the HHT transformation theory, and finding a fault feature vector; carrying out the actual measurement of the excitation current, carrying out the processing and analysis of the excitation current passing through the slip ring through the Hilbert spectrogram, taking a periodic high-frequency component as the basis for judging whether the slip ring has a burn fault or not, and verifying the feasibility of the method through the comparison with the simulation result. The method based on the Hilbert-Huang transformation theory is accurate and effective, is high in diagnosis precision, and is high in operability.

Description

technical field [0001] The invention relates to a method for diagnosing burn faults of generator brush slip rings, which belongs to the technical field of generators. Background technique [0002] Doubly-fed asynchronous induction generator (DFIG) is widely used in wind power generation systems due to its characteristics of sensitive speed adjustment, bi-directional power conversion, and flexible frequency conversion control. As the dynamic and static conversion device of the generator, it is not uncommon for the generator to fail to operate stably due to the failure of the running brush slip ring system. Shutdown after load. At the same time, the daily maintenance workload of the brush slip ring system is heavy, requiring frequent manual inspection and component replacement, especially for wind turbines in harsh environments such as high altitude, low air pressure, and high humidity. The difficulty of maintaining and repairing the large brush slip ring system and the inve...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 马宏忠李思源张艳魏海增刘宝稳徐艳
Owner HOHAI UNIV
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