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Wind turbine wake flow wind speed algorithm

A wind turbine and wind speed technology, which is applied in the wake calculation of wind turbines, and the field of wind turbine wake calculation revised by the k-ε turbulence model, can solve the problems of too fast wake recovery and little improvement in calculation accuracy.

Inactive Publication Date: 2020-07-31
中国大唐集团新能源科学技术研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the wake recovery is too fast when the actuation disk method is used alone to calculate the wake, and the existing correction method does not improve the calculation accuracy much, on the basis of the original turbulent flow energy item, add the dissipation The rate source term makes the generation and dissipation of turbulent kinetic energy in the wake more realistic, thereby improving the calculation accuracy of the wake. The invention provides an algorithm for wind speed in the wake of a wind turbine, which includes the following steps:

Method used

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  • Wind turbine wake flow wind speed algorithm
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  • Wind turbine wake flow wind speed algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: Dawin Wind Turbine Wake Simulation

[0057] Dawin wind turbines are in Sweden, and there are two comparative working conditions:

[0058] (1) When U=8m / s, C T =0.82, turbulence intensity 7%;

[0059] (2) When U=11m / s, C T =0.65, turbulence intensity 6%;

[0060] Follow the steps below to model and calculate by computer,

[0061] Step 1: Initially assign values ​​to the inlet boundary conditions, and set the inflow wind speed passing through the fan as u 0 , the turbulent kinetic energy is k, and the dissipation rate is;

[0062] Step 2: Use the actuating disk model to simulate the influence of the wind wheel, and obtain the incompressible N-S equation with a source term, the source term of the N-S equation is the impeller momentum source term S u , S d is the momentum source term of the engine room; the incompressible N-S equation with the source term is two equations:

[0063] Equation (1) is

[0064] Equation (2) is

[0065] u i and u j is t...

Embodiment 2

[0074] Embodiment two: Garrad Hassan experimental data

[0075] GH company conducted a series of wake experiments on scaled wind turbines in the atmospheric boundary layer wind tunnel. The diameter of the wind rotor of the prototype wind turbine is 43.2m, and the hub height is 50m. The wind speeds at 2.5D, 5D, 7.5D, and 10D positions downstream of the wind rotor are given in the report. There are two comparison conditions, namely:

[0076] (1) When U=5.3m / s, C T =0.607, roughness z 0 =0.075;

[0077] (2) When U=5.3m / s, C T =0.858, roughness z 0 = 0.075.

[0078] Follow the steps below to model and calculate by computer,

[0079] Step 1: Initially assign values ​​to the inlet boundary conditions, and set the inflow wind speed passing through the wind turbine as u 0 , the turbulent kinetic energy is k, and the dissipation rate is;

[0080] Step 2: Use the actuating disk model to simulate the influence of the wind wheel, and obtain the incompressible N-S equation with a...

Embodiment 3

[0092] Example 3: Horns Rev offshore wind farm measurement

[0093] The measured data of the Horns Rev offshore wind farm was selected for comparative analysis. There are 80 Vestas-V80 wind turbines in the field, with a rated capacity of 2MW, a hub height of 70m, and an impeller diameter of 80m. According to the actual operation of the wind farm, the three statistics shown in Table 3 group data.

[0094]

[0095] Follow the steps below to model and calculate by computer,

[0096] Step 1: Initially assign values ​​to the inlet boundary conditions, and set the inflow wind speed passing through the fan as u 0 , the turbulent kinetic energy is k, and the dissipation rate is;

[0097] Step 2: Use the actuating disk model to simulate the influence of the wind wheel, and obtain the incompressible N-S equation with a source term, the source term of the N-S equation is the impeller momentum source term S u , S d is the momentum source term of the cabin; the incompressible N-S eq...

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Abstract

The invention relates to a wind turbine wake flow wind speed algorithm which comprises the steps: step 1, carrying out initial assignment on an inlet boundary condition, and setting the incident flowwind speed passing through a wind turbine to be u0, the turbulent flow kinetic energy to be k and the dissipation rate to be epsilon; step 2, adopting a non-compressible N-S equation with a momentum source item of an impeller and a momentum source item of a cabin under an actuating disc model; step 3, adopting a turbulence model with a turbulence energy item and a dissipation rate source item; andstep 4, solving the wind speed by combining the three steps. According to the invention, the problem that when the wake flow is calculated by using an actuating disc method alone, the wake flow recovery is too fast is solved, the problem that existing correction methods have little improvement effect on the accuracy of calculation is solved, a dissipation rate source item is added on the basis ofan original turbulent flow energy item, so that the generation and dissipation rules of turbulent flow kinetic energy in the wake flow more accord with the reality, and the wake flow calculation precision is improved.

Description

technical field [0001] The invention relates to a calculation method for a wind turbine wake, in particular to a wind turbine wake calculation method for revising a k-ε turbulence model, and the invention belongs to the field of wind power generation. Background technique [0002] With the improvement of national environmental protection awareness, the development of clean energy is very important to promote the progress of the national economy and protect the environment, and wind energy, as an important clean energy, will occupy an important position in the future. In the process of wind power generation, the research on the wake effect of wind turbines has important guiding significance for the layout of wind farm units and the collection of wind turbine power data, and has attracted the close attention of experts and scholars in recent years. [0003] For the numerical research of the wind turbine wake, generally speaking, the calculation accuracy mainly depends on two p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
Inventor 辛克锋王朝张蓉张树晓张晓东
Owner 中国大唐集团新能源科学技术研究院有限公司
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