Variable-speed pumped storage unit rotor short circuit and eccentricity fault diagnosis method

A pumped-storage unit and rotor short-circuit technology, which is applied in electrical winding testing, computer components, character and pattern recognition, etc., to achieve the effect of avoiding waste of manpower and material resources

Pending Publication Date: 2022-05-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the existing methods may misjudge the rotor eccent

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  • Variable-speed pumped storage unit rotor short circuit and eccentricity fault diagnosis method
  • Variable-speed pumped storage unit rotor short circuit and eccentricity fault diagnosis method
  • Variable-speed pumped storage unit rotor short circuit and eccentricity fault diagnosis method

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0029] Taking a variable-speed pumped-storage unit with 7 pairs of poles as an example, when a short-circuit fault occurs in the rotor winding, the branch circulation on the stator side will induce harmonic circulation with the following characteristic frequency:

[0030]

[0031]

[0032] When the slip s is 0.1, use the above formula to calculate the theoretical value of the characteristi...

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Abstract

The invention discloses a short circuit and eccentricity fault diagnosis method for a rotor of a variable-speed pumped storage unit, and belongs to the field of relay protection of generator motors. The method comprises the following steps: collecting stator side branch current data corresponding to a rotor eccentric fault of the variable-speed pumped storage unit and all rotor winding short-circuit faults possibly occurring in a slot and at an end part as an original data set; extracting low-frequency components of each phase of branch circulating current on the stator side in the original data set, and performing normalization and fault type marking to obtain a training set and a test set; training the LSTM neural network model by using the training set, and checking the trained neural network model by using the test set; and when the accuracy of the test result reaches the standard, storing the corresponding model for fault diagnosis of the rotor short-circuit fault and the rotor eccentric fault of the variable-speed pumped storage unit. The method has high sensitivity, and can reliably realize fault diagnosis of rotor winding short circuit fault and rotor eccentricity fault.

Description

technical field [0001] The invention belongs to the technical field of generator-motor relay protection, and more specifically relates to a method for diagnosing short-circuit and eccentric faults of a rotor of a variable-speed pumped-storage unit. Background technique [0002] The pumped storage power station has excellent peak-shaving and frequency-regulating capabilities, and can meet the flexible adjustment requirements brought about by the new energy "depending on the sky". It is an important guarantee for the safe and stable operation of the new power system with new energy as the main body. Compared with the traditional fixed-speed pumped-storage unit, the variable-speed pumped-storage unit overcomes the limitation that it can only be used for peak regulation and frequency regulation, and can perform high-efficiency adjustments in a wide power range in real time, and has a broader application prospect. [0003] Rotor winding short-circuit fault and rotor eccentric fau...

Claims

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Application Information

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IPC IPC(8): G06K9/62G06N3/04G01R31/72
CPCG01R31/72G06N3/044G06F18/241G06F18/214
Inventor 尹项根乔健王义凯谭力铭卢庆辉徐雯张哲文明浩陈卫
Owner HUAZHONG UNIV OF SCI & TECH
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