Dynamic unbalance online testing and fault identification method and system for wind turbine generators

A wind turbine and fault identification technology, which is applied in the monitoring of wind turbines, machines/engines, and wind turbines, and can solve problems such as inability to refine fault causes, mass moment imbalance, and difficulty in troubleshooting

Active Publication Date: 2016-05-11
XINJIANG GOLDWIND SCI & TECH
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Problems solved by technology

In the above-mentioned patents, it can only detect the imbalance, but cannot further diagnose the specific cause, such as aerodynamic imbalance

Method used

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  • Dynamic unbalance online testing and fault identification method and system for wind turbine generators
  • Dynamic unbalance online testing and fault identification method and system for wind turbine generators
  • Dynamic unbalance online testing and fault identification method and system for wind turbine generators

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Embodiment Construction

[0041] figure 1 It is a flow chart according to the first implementation form of the present invention, which shows a method for online detection and fault identification of wind turbine dynamic unbalance, and the specific method steps of the method are as follows:

[0042] Firstly, step S101 is executed to synchronously sample generator power P, pitch angle position pit, wind rotor speed ω, and acceleration a in the front and rear direction of the nacelle within a set time length t, for example, 10 minutes. The above synchronous sampling obtains N pieces of collected data, and each collected data includes generator power P(n), pitch angle position pit(n), wind rotor speed ω(n), and acceleration a(n) in the front-to-back direction of the nacelle, where n is an integer, 1≤n≤N.

[0043] Then, step S102 is executed to determine whether the wind turbine is operating under the design test condition according to the collected generator power P and the pitch angle position pit.

[...

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Abstract

The invention discloses a dynamic unbalance online testing and fault identification method and system for wind turbine generators. The method includes the following steps that within a set time duration, synchronous sampling on the generator power, the pitch angle position, the wind wheel rotating speed and the accelerated speed of a cabin in the front and back direction is carried out; according to the generator power and the pitch angle position collected according to synchronous sampling, whether a draught fan runs under the designed testing work condition or not is judged; if it is judged that the draught fan runs under the designed testing work condition, at least spectral analysis is carried out on time series of the collected wind wheel rotating speed; according to results of the spectral analysis on the time series of the collected wind wheel rotating speed, whether the draught fan has impeller unbalance faults or not is judged; if the draught fan has impeller unbalance faults, either pneumatic imbalance or quality moment imbalance is the reason of unbalancedness is judged according to the results of the spectral analysis on the time series of the accelerated speed of the cabin in the front and back direction. The invention further discloses a corresponding system.

Description

technical field [0001] The invention relates to a method and system for state monitoring and fault diagnosis of a wind turbine, in particular to a method and system for on-line fault detection and identification of impeller unbalance. Background technique [0002] As a clean and renewable energy, wind energy has been paid more and more attention by countries all over the world. Driven by the national development and utilization of renewable energy policies, my country's wind power industry has developed rapidly, and its grid-connected capacity has reached the first in the world, and there is still great potential for development. However, with the continuous development of unit capacity and large-scale wind farms, how to improve and ensure the reliability of wind turbine operation has become a research hotspot in this field. [0003] For large-capacity units with high towers and long blades, there are disadvantages such as large loads and small damping. Due to problems such...

Claims

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Application Information

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IPC IPC(8): F03D17/00
CPCF05B2260/80
Inventor 李永明王方超李强
Owner XINJIANG GOLDWIND SCI & TECH
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