Doubly-fed wind power generator stator current diagnosis method for impeller imbalance fault

A technology of doubly-fed wind power generation and doubly-fed wind turbines, which is applied to the control of generators, motor generators, and electronically commutated motors. Diagnosis and other problems to achieve the effect of improving safety and low diagnosis cost

Active Publication Date: 2014-12-03
CHONGQING UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Current fault diagnosis of impellers is based on methods such as vibration, stress and strain changes of blades, temperature, X-ray imaging, and ultrasonic waves. These methods require additional sensors and data acquisition devices, which are not only costly, but also have low reliability. Very low, cannot effectively implement condition monitoring and fault diagnosis
In addition, the fault diagnosis method based on the existing wind turbine direct stator current characteristic quantity often leads to the problem that the extraction of the fault characteristic quantity is not obvious

Method used

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  • Doubly-fed wind power generator stator current diagnosis method for impeller imbalance fault
  • Doubly-fed wind power generator stator current diagnosis method for impeller imbalance fault
  • Doubly-fed wind power generator stator current diagnosis method for impeller imbalance fault

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Embodiment 1

[0032] figure 1 It is the fault diagnosis process of the impeller imbalance of the doubly-fed wind turbine, as shown in the figure: a doubly-fed wind power generator stator current diagnosis method for the impeller unbalance fault provided by the present invention includes the following steps:

[0033] 1) Collect the stator single-phase current i of the doubly-fed generator through the current sensor and data acquisition equipment installed on the doubly-fed wind turbine sa (t), and use FFT analysis to extract i sa (t) fundamental frequency f e ;

[0034] 2) Using the obtained fundamental frequency f e , to calculate the fault characteristic component i of the stator phase current under the impeller unbalanced fault saf (t);

[0035] 3) Acquire the impeller speed signal of the wind turbine through the speed sensor and data acquisition equipment installed on the doubly-fed wind turbine, and calculate the characteristic frequency of the stator current impeller unbalance fau...

Embodiment 2

[0045] Taking the impeller unbalance fault operation status of the doubly-fed wind turbine as an example, the influence of the impeller unbalance fault on the stator current is analyzed below:

[0046] When the wind turbine is at a constant angular velocity ω m During operation, the unbalanced impeller will cause the shaft torque output by the wind turbine to change. At this time, the shaft torque output by the wind turbine can be expressed as:

[0047]

[0048] In the formula: t is the time constant; T is the shaft torque output by the wind turbine; T 0 is the aerodynamic torque generated by the wind turbine; T v is the amplitude of torque fluctuations caused by unbalanced faults; is the initial phase angle.

[0049] The transmission model of the doubly-fed wind turbine blade, hub, gearbox, drive shaft and generator rotor is equivalent to a lumped mass, and the equation of motion is:

[0050] 2 H M ...

Embodiment 3

[0077] Taking the 1.5MW double-fed wind turbine as the research object, the short-term wind speed simulation model is used to simulate the actual operating environment of the wind turbine, and a turbulent wind speed with a turbulent intensity of 3% and an average wind speed of 11m / s is constructed, as shown in figure 2 shown.

[0078] In order to quantitatively express the impeller unbalance fault degree, the impeller unbalance coefficient F is defined T for:

[0079] f T =T v / T 0 (14)

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Abstract

The invention relates to a doubly-fed wind power generator stator current diagnosis method for an impeller imbalance fault. The method concretely comprises the steps that doubly-fed generator stator single-phase current is collected, and the fundamental frequency of the stator single-phase current is extracted by utilizing FFT analysis; the fault characteristic component of the stator single-phase current under the impeller imbalance fault is calculated by utilizing the obtained fundamental frequency; an impeller rotation speed signal of a wind generation set is collected, and the characteristic frequency of the impeller imbalance fault of the stator current is calculated; spectral analysis is performed on the obtained fault characteristic component of the stator phase current by utilizing FFT, according to the fault characteristic frequency at this time, the value of amplitude at the frequency is extracted, and under the same wind speed condition, characteristic frequency amplitude values of the wind generation set under normal circumstances are compared to judge the severity of the fault. According to the method, the problem that based on an existing direct fault diagnosis method for the stator current characteristic quantity of a wind power generator, the extracted fault characteristic quantity is not obvious is effectively solved. Accordingly, the method is a fault diagnosis method capable of effectively improving the safety and reliability of blades.

Description

technical field [0001] The invention belongs to the technical field of state monitoring and fault diagnosis of wind power generators, and relates to a stator current diagnosis method of a doubly-fed wind power generator for unbalanced faults of impellers. Background technique [0002] With the increasing single-unit capacity of grid-connected wind turbines in my country, and the planning, construction and operation of large-scale wind farms, especially offshore wind farms, how to improve and ensure the operational reliability of wind turbines has become an important issue in domestic and foreign engineering and academic circles. focus of world attention. In recent years, DFIG has become one of the main models for the installation and operation of large-capacity wind farms. Research on how to apply condition monitoring technology to reduce the frequency of failures and operation and maintenance costs of DFIGs and increase their power generation has attracted attention. extens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 李辉杨东李洋杨超胡姚刚刘志祥梁媛媛欧阳海黎兰涌森
Owner CHONGQING UNIV
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