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Individual pitch control system and method for wind driven generator

A technology of wind turbines and independent pitch adjustment, which is applied in the control of wind turbines, wind turbines, wind power generation, etc., and can solve problems such as the load on wind turbine rotors

Inactive Publication Date: 2015-12-16
SHANGHAI DIANJI UNIV
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AI Technical Summary

Problems solved by technology

[0010] In order to overcome the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide an independent pitch control system and method for wind turbines to solve the problems of wind turbines being loaded and extend the operating life of wind turbines

Method used

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  • Individual pitch control system and method for wind driven generator
  • Individual pitch control system and method for wind driven generator
  • Individual pitch control system and method for wind driven generator

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specific Embodiment

[0055] Generally speaking, there are three types of wind models: constant wind, turbulent wind and gust models. Among them, turbulent wind refers to the wind whose direction and magnitude change with time, and is one of the common wind models. In addition to the above three wind models, in actual situations, the influence of wind shear, tower shadow effect and other factors on wind turbines should also be considered.

[0056] (1) Wind shear effect: Natural wind changes randomly and is unevenly distributed. The change of wind speed is greatly affected by height, and this effect becomes more obvious as the wind turbines become larger. Wind shear causes a large change in wind speed in the vertical direction (such as image 3 Shown). Wind shear means that the wind speed at the vertical height will change with the height. Assuming that the wind speed at the ground is zero, the wind speed at different heights satisfies the following exponential model formula:

[0057] V ( z...

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Abstract

The invention discloses an individual pitch control system and method for a wind driven generator. The system comprises a wind driven generator unit, a state observer and a disturbance accommodating controller; the state observer and the disturbance accommodating controller are additionally arranged in the system according to control input and interference input, the gain coefficients Gx and Gd are adjusted according to the specific circumstances to control the influences of errors and the interference input, and finally individual pitch control is achieved. According to the individual pitch control system and method for the wind driven generator, an individual pitch control strategy based on a linear quadratic regulator and a disturbance accommodating control technology is adopted, the problems that wind wheels of the wind driven generator are loaded are solved, the operation life of the wind driven generator is prolonged, the vibration load of the wind driven generator is effectively reduced, and the purpose of vibration reduction is well achieved; meanwhile, the disturbance accommodating control technology is introduced to inhibit or reduce the influences of the wind speed, the turbulent flow, the wind shear and tower shadow effects and the like on the wind driven generator, and the robustness of the system is improved.

Description

Technical field [0001] The invention relates to a control strategy for a pitch system of a wind turbine, in particular to a wind turbine independent pitch control system and method based on linear quadratic regulation and interference adaptive control technology. Background technique [0002] At present, the main application of most wind turbines is still unified pitch, but in the actual operating environment, due to the influence of wind shear, tower shadow and other factors, unbalanced loads are generated in the plane of the wind wheel, resulting in large blade tip deformation and increased Blade fatigue load, and unified pitch control cannot effectively solve the problem of uneven load, and with the enlargement of wind turbines, the impact of this unbalanced load becomes greater and greater, and it cannot reduce the imbalance in the plane of the wind turbine. Load, thereby reducing the vibration of a series of key components such as the hub, main shaft, and tower. [0003] In r...

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Application Information

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IPC IPC(8): F03D7/00
CPCY02E10/72
Inventor 程申高桂革曾宪文
Owner SHANGHAI DIANJI UNIV
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