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Method for diagnosing pneumatic asymmetric fault of impeller of doubly-fed wind turbine generator system

A technology of doubly-fed wind power generation and diagnostic methods, which is applied to wind power generator components, wind power engines, engines, etc., to achieve the effect of easy implementation and improved accuracy

Active Publication Date: 2016-01-06
温州华电实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a diagnostic method for the aerodynamic asymmetry fault of the doubly-fed wind power generating set, so as to overcome the defect in the prior art that there is no diagnostic method for the aerodynamic asymmetry fault of the impeller

Method used

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  • Method for diagnosing pneumatic asymmetric fault of impeller of doubly-fed wind turbine generator system
  • Method for diagnosing pneumatic asymmetric fault of impeller of doubly-fed wind turbine generator system
  • Method for diagnosing pneumatic asymmetric fault of impeller of doubly-fed wind turbine generator system

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Embodiment 1

[0026] Such as figure 1 As shown, the method for diagnosing the aerodynamic asymmetry fault of the impeller of the doubly-fed wind power generating set according to the specific embodiment of the present invention includes the following steps:

[0027] 1) Use the rotational speed sensor, current sensor and power sensor to synchronously collect the rotational speed of the impeller 6 of the DFIG, the single-phase current of the rotor of the DFIG, the single-phase current of the stator, and the DFIG synchronously within the time period t, respectively. The active power of the wind turbine, and save the collected data to the computer for fault diagnosis and analysis.

[0028] 2) In the time period t, select the time period t when the speed of the impeller 6 is stable 1 (t 1 1 The average speed of the impeller 6 within n w .

[0029] 3) Judging the average speed n w Is it less than the rated speed n of the impeller 6 N .

[0030] 4) If the average speed n w Less than the ra...

Embodiment 2

[0037] The influence of the aerodynamic asymmetry fault of the impeller of the doubly-fed wind turbine on the aerodynamic torque and active power is analyzed below through the speed and force in the plane of the blade element airfoil.

[0038] This embodiment is based on the blade element theory of momentum (BEM). The leaf element theory divides the blade into N equal parts, assuming that the airfoil of each leaf element is the same. The schematic diagram of the speed and force in the airfoil plane of the blade element is as follows: image 3 shown. For the wind turbine 5 in the rotating state (such as figure 2 As far as the impeller 6 is shown), the blade element aerodynamic force only considers the tangential traction force F parallel to the impeller rotation plane T and the axial thrust F perpendicular to the plane of impeller rotation N , where F TThe function is to generate aerodynamic torque and output it to the doubly-fed wind generator 8 (such as figure 2 shown...

Embodiment 3

[0050] The following is an analysis of the influence of the aerodynamic asymmetry fault of the impeller 6 on the current of the rotor and the current of the stator when the doubly-fed wind turbine is running at maximum wind energy.

[0051] In order to improve the utilization rate of wind energy and the efficiency of wind power generation, the Maximum Power Point Tracking (MPPT) control strategy is commonly used in doubly-fed wind power generation systems. Among them, the optimal power-speed curve method is commonly used by most doubly-fed wind turbines in MPPT control. It means that when the unit is connected to the grid and operates below the rated speed, in order to capture the maximum wind energy, the wind energy utilization coefficient of the wind turbine 5 must always maintain the maximum value C pmax , while the pitch angle of the wind turbine 5 is not adjusted, and the speed of the unit is indirectly adjusted by controlling the output power of the generator, so as to m...

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Abstract

The invention provides a method for diagnosing a pneumatic asymmetric fault of an impeller of a doubly-fed wind turbine generator system. The method comprises the following steps: synchronously a rotating speed of the impeller, and the single-phase currents and the active powers of a rotor and a stator of a doubly-fed wind power generator within a time period t; selecting a time period t1 when the rotating speed of the impeller is steady and calculating a rotating speed mean value nw of the impeller; judging whether the rotating speed mean value nw is smaller than a rated rotating speed nN of the impeller, and if so, calculating a one-time rotational frequency fw of the impeller; performing Hilbert envelope demodulation on the single-phase current of the rotor and / or the single-phase current of the stator within the time period t1 and determining whether a fault frequency nfw exists in an envelope demodulation frequency spectrogram, and if so, calculating a mean value P of the active power of the doubly-fed wind turbine generator system within the time period t1; and if the mean value P of the active power is smaller than an active power base value P1, judging that the doubly-fed wind turbine generator system has the pneumatic asymmetric fault of the impeller. According to the method, the accuracy of diagnosis is improved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for diagnosing the aerodynamic asymmetry fault of an impeller of a doubly-fed wind power generating set. Background technique [0002] As a clean and green renewable energy, wind energy has become an important direction for the development of new energy all over the world. The aerodynamic asymmetry of the impeller of the wind turbine actually refers to the uneven distribution of the aerodynamic torque of the three blades. Ice and other reasons change the airfoil. [0003] Due to the aerodynamic asymmetry, the output mechanical torque of the wind turbine is directly reduced and fluctuates, which further affects the active power and power quality delivered by the generator to the grid; in addition, the aerodynamic asymmetry will also cause the vibration of the shaft system of the wind turbine , aggravate the fatigue of components such as blades and bearings, and long...

Claims

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Application Information

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IPC IPC(8): F03D11/00
Inventor 绳晓玲万书亭成立峰
Owner 温州华电实业有限公司
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