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Fan variable- pitch optimizing method based on rotation-speed-limited smooth power control

A technology of power control and optimization method, which is applied in the direction of wind power engine, engine control, and optimization of machine performance, etc., to achieve the effect of reducing amplitude and frequency, reducing operating pressure and blade load

Active Publication Date: 2018-11-20
NANJING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that existing smoothing power methods are limited to the independent application of variable speed and pitch control, resulting in only the rotor at zero pitch angle being used as a kinetic energy buffer

Method used

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  • Fan variable- pitch optimizing method based on rotation-speed-limited smooth power control
  • Fan variable- pitch optimizing method based on rotation-speed-limited smooth power control
  • Fan variable- pitch optimizing method based on rotation-speed-limited smooth power control

Examples

Experimental program
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Effect test

Embodiment

[0043]Use the open source professional wind turbine simulation software FAST (Fatigue, Aerodynamics, Structures, and Turbulence) provided by the National Renewable Energy Laboratory (NREL) of the US Department of Energy to simulate the control effect. The wind turbine model adopts the 600kW CART3 test model developed by NREL, and the specific parameters are shown in Table 1.

[0044] Table 1 Main parameters of NREL 600kW CART3 wind turbine

[0045]

[0046] The control structure of the wind turbine pitch optimization method based on smooth power control with limited speed is as follows: figure 2 As shown, it mainly includes three parts: speed range control based on pitch adjustment, output power smoothing power control based on wind rotor kinetic energy buffering, and wind turbine stability maintenance based on MPPT.

[0047] Set the wind rotor speed ω r As input, output torque command and the pitch angle command β ref , and then send the two commands to the generator...

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Abstract

The invention discloses a fan variable-pitch optimizing method based on rotation-speed-limited smooth power control. Aiming at solving the problem of frequent pitch changing of a fan under the air condition of high air speed, the method sufficiently uses the large rotational inertia air wheel kinetic energy buffering / release function of any pitch angle and achieves the rotation speed interval control of the fan under any pitch angle on the basis of reducing the output power fluctuation of the fan based on rotation-speed-limited smooth power control. Through cooperative use of the variable-speed adjustment and variable-pitch adjustment, the smooth variable-speed adjustment causes power fluctuation due to small-amplitude and high-frequency air speed fluctuation, and the variable-pitch adjustment responds to the large-amplitude and low-frequency air speed changes. The power grid frequency fluctuation caused by power fluctuation is within the power grid allowable range. The amplitude and frequency of the variable-pitch action are reduced effectively, the fatigue degree and blade loads of a variable-pitch servo mechanism are reduced, and the service life of the fan is prolonged.

Description

technical field [0001] The invention belongs to the field of wind turbine control, and in particular relates to a wind turbine pitch optimization method based on smooth power control with limited speed. Background technique [0002] Wind power has significant randomness and volatility. With its large-scale and high penetration rate integrated into the grid, the violent fluctuations of wind power from seconds to minutes will make the grid face severe frequency stability problems. For this reason, wind turbines need to adopt a series of smooth power control to relieve the pressure of power grid frequency regulation. [0003] At present, the methods to achieve wind power smoothing can be mainly divided into two categories: smoothing methods relying on external energy storage and methods relying on wind turbine control. For the former, although the energy cache of energy storage equipment can effectively reduce wind power fluctuations, it also greatly increases the cost of pow...

Claims

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Application Information

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IPC IPC(8): F03D7/00
CPCF03D7/00F05B2260/70F05B2270/20F05B2270/304F05B2270/328Y02E10/72
Inventor 殷明慧李冬运陈思瑾张欢李群刘建坤周前陈兵汪成根卜京谢云云邹云陈哲张宁宇卫鹏
Owner NANJING UNIV OF SCI & TECH
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