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Method of suppressing ripples caused by wind shear effects

A wind shearing and effect technology, applied in AC network to reduce harmonic/ripple, harmonic reducing device, single network parallel feeding arrangement, etc., can solve the problems of poor control stability and difficult parameter setting, etc. Achieve the effects of increasing complexity, stable current, and quality assurance of grid-connected power

Inactive Publication Date: 2019-06-25
CENT SOUTH UNIV
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Problems solved by technology

Although ADRC itself has an excellent structure, its parameters are difficult to tune; and its control stability is not outstanding when the wind speed continuously changes nonlinearly

Method used

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  • Method of suppressing ripples caused by wind shear effects
  • Method of suppressing ripples caused by wind shear effects
  • Method of suppressing ripples caused by wind shear effects

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Embodiment Construction

[0023] The ripple suppression method proposed by the present invention needs to use the soft sensor method to extract the ripple characteristics caused by the wind shear effect. This step is completed by constructing an ANN artificial neural network: measure the generator speed ω, and the speed As the original input of the ANN network, set the reference input as: sinωt, cosωt, sin2ωt, cos2ωt... sinnωt, cosnωt, n=1, 2...n, and the corresponding weight is w s ,w c ,w 2s ,w 2c ...w ns ,w nc , use the formula: Compared with the original input speed signal, the difference between the two is represented by e(t), and the e(t) is judged repeatedly 2 (t) to approach the optimal solution, when e 2 When (t) is the smallest, it represents ω * (t) is the rotational speed measurement value obtained by the ANN network, each weight w s ,w c ,w 2s ,w 2c ...w ns ,w nc Represents the characteristics of each harmonic.

[0024] The above-mentioned ANN network uses the following form...

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Abstract

The invention discloses a method of suppressing ripples caused by wind shear effects. The application object is a direct-drive permanent magnet synchronous wind power generation system which comprisesa soft measurement module based on an ANN artificial neural network, a characteristic signal extraction module, and a control instruction generation module. Soft measurement is carried out on rotational speed ripples caused by wind shear effects, the characteristic value is obtained, a cancellation control command is generated and injected to the front end of a control closed loop, and spreadingof current ripples caused by the wind shear effects in the wind power generation system can thus be suppressed. The method disclosed in the invention can weaken a tower vibration response amplitude, reduce a current distortion rate, improve the occurrence of a voltage flicker phenomenon and finally ensure the grid-connected power quality under the wind shear effects.

Description

technical field [0001] The invention relates to wind power generation technology, soft measurement technology and ripple suppression method, and belongs to the technical field of wind power generation. Background technique [0002] The wind speed is not evenly distributed in a certain vertical plane. Within a certain height, the wind speed also shows an increasing trend with the increase of the height. In the range of 0-1000m above sea level, as the altitude increases by 100m, the wind speed increases by an average of 0.5m / s, and this data reaches about 1.5m / s in the range of 0-300m. [0003] The above-mentioned distribution characteristics of wind speed in vertical height cause wind shear effect in wind turbines—that is, the phenomenon that the mechanical torque generated by wind turbines contains periodic fluctuations. In this patent, various periodic pulsations caused by wind shear effects are defined as ripples, which will affect the torque, blades, towers, generators, ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01
CPCY02E40/40
Inventor 黄国航李志勇王欣
Owner CENT SOUTH UNIV
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