Offshore wind profile model based on neutral equivalent wind speed and use method thereof

A technology of equivalent wind speed and wind profile, applied in the field of offshore wind resource research, can solve the problems of wind resource assessment error, influence of offshore wind resource assessment accuracy, deviation of power generation design value and actual operation value, etc.

Active Publication Date: 2021-08-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing studies on the characteristics of offshore wind resources all use a single parameter description, and some studies directly use the sea surface dynamic roughness parameterized model to fit the offshore wind profile, ignoring that the atmosphere in the model is always in a neutral stratification In fact, the state of the ocean surface is changing all the time, and there are very few periods of neutral stratification in the atmosphere. This approximation will bring errors in wind resource assessment, resulting in a discrepancy between the design value of the entire power generation and the actual operating value. bias, affecting the accuracy of offshore wind resource assessments

Method used

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  • Offshore wind profile model based on neutral equivalent wind speed and use method thereof
  • Offshore wind profile model based on neutral equivalent wind speed and use method thereof
  • Offshore wind profile model based on neutral equivalent wind speed and use method thereof

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Experimental program
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Effect test

Embodiment 1

[0066]Embodiment 1, the present invention provides a technical solution: a sea winding profile model based on neutral equivalent wind speed, first passing the wind speed of near-ground layers by Mo Ning Aubhov similar theory. Relationship Point form:

[0067]

[0068] Assume U zn To meet the wind speed of the height z of neutral conditions, it is:

[0069]

[0070] Get the above equation and the establishment;

[0071]

[0072] ψ m It is the wind profile stability correction function, the relationship between the specific and different stability is:

[0073]

[0074] in,

[0075] Unlike;

[0076]

[0077] Where: z 0 As the surface dynamics roughness, U * For the friction speed, K is the Fengka door coefficient, take 0.4, u (z) to measure the measured wind speed at any time of the wind height z;

[0078] Then classify the atmospheric stability and will be ψ at time m After entering the above, the air speed of the moment is converted into a neutral state, and the equivale...

Embodiment 2

[0089] Example 2, such as figure 1 As shown, a method of use based on neutral equivalent wind speed, first input two height wind speed, temperature, 10 meters height wind speed and hub height;

[0090] Among them, based on Renault stress relationship, the average wind speed is used in 10m height. 10 And its corresponding drag coefficient C d The obtained friction speed calculation is:

[0091]

[0092] Tow coefficient C d Average wind speed with 10M height U 10 The correspondence is:

[0093]

[0094] The relationship between roughness and roughness and friction wind speed is:

[0095]

[0096] Among them, α = 0.0185;

[0097] Calculate the Mow Length, Moio Length L and Gradient Ratio i They are all identified the stability parameters of the atmospheric stability state, and the calculation method is:

[0098]

[0099] Where is Z 1 ,z 2 For different height layers,

[0100] ΔT is the absolute temperature difference between the two height layers,

[0101] Gamma d For dry ins...

experiment example 1

[0117] Experimental Example 1. Taking the Dalian Manor's maritime wind farm stroke tower data as an example, the wind tower is located in the vicinity of the Natern South Island of Huanghai; data collection time is 0:00 on November 13, 2015 24, 2015 24 When the sampling period is 10 min. The data includes an average, maximum, minimum, and variance per channel. The original data is high, reaching 95%, according to national standards GB / T18710-2002 and industry standard NB / T 31147-2018, the complete rate after the data is 100%, Table 1 is the basic information of the wind tower.

[0118] Table 1 Stroke Basic Information

[0119]

[0120] (1) Atmospheric stability is the main thermal factor that causes wind speed and vertical changes, and the atmospheric state is classified.

[0121] Table 2 Atmospheric stability classification standard

[0122]

[0123] In order to verify the accuracy of the atmospheric stability classification, the accuracy of extrapolation calculation is g...

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Abstract

The invention provides an offshore wind profile model based on a neutral equivalent wind speed, and the model comprises the steps: firstly inputting two height layer wind speeds, temperatures, a 10-meter height wind speed and a hub height, calculating the roughness, then calculating the Moom length, and then obtaining an equivalent wind speed u1n based on a neutral state, and obtaining ex-thrust hub height wind speed. The offshore wind profile model based on the neutral equivalent wind speed, provided by the invention, is obtained based on the influence of factors such as the wind shear index, the atmospheric stability and the turbulence intensity on the offshore wind resources.Compared with a traditional extrapolation method, the annual average wind speed and the wind power density of the hub height obtained by the model are closer to measured values, the wind speed root mean square error and the average absolute error are 0.43 m/s and 0.28 m/s respectively, the influence of sea surface dynamic roughness and atmospheric stability changes on offshore wind speed vertical distribution is effectively reflected, the defects of a traditional wind shear formula are overcome, and a basis is provided for offshore wind resource evaluation and early-stage planning of an offshore wind plant.

Description

Technical field [0001] The present invention belongs to the technical field of sea wind resources research, and specific relates to a marine wind profile model based on neutral equivalent wind speed. Background technique [0002] my country's sea-style resource reserves are stable and close to the load center, and the development of sea wind power does not occupy the land. Therefore, sea wind power has become a hot spot in recent years, but due to the more complicated weather in the sea, the evaluation technology is still in the primary R & D phase, the feasibility demonstration is difficult. Therefore, the accuracy of improving the assessment of sea wind resources is the key to reducing investment risks in offshore wind power projects and improving core competitiveness. Under the marine atmospheric boundary layer is a complex sea surface, and the selection model of the marine surface status helps to in-depth at sea atmospheric boundary layer physical process, thereby increasing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10G01P5/00
CPCG06F17/10G01P5/001
Inventor 马晓梅刘永前阎洁韩爽李莉孟航李玉浩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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