CN105587474A - Method and device for testing equivalent wind speed of wind wheels of wind turbine generator systems - Google Patents

Abstract

The invention provides a method and device for testing equivalent wind speed of wind wheels of wind turbine generator systems. The method comprises the steps of determining the testing points of the equivalent wind speed of the wind wheels of the wind turbine generator systems; obtaining the equivalent wind speed of the wind wheels of the wind turbine generator systems according to the kinetic energy flux theory. According to the method, the problems that the measuring accuracy of the wind speed is low and the deviation of the wind speed is large in the testing process of power curves of the large wind turbine generator systems are solved, and the standardization and the accuracy of testing the power characteristic of the wind turbine generator systems are effectively improved.

Description

A kind of method of testing and device of wind-powered electricity generation unit wind wheel equivalent wind speed

Technical field

The present invention relates to a kind of method of testing and device, be specifically related to a kind of test side of wind-powered electricity generation unit wind wheel equivalent wind speedMethod and device.

Background technology

Wind-power electricity generation as technology in regenerative resource exploitation the most ripe, have most before scale development and commercialized developmentOne of generation mode of scape, because it is alleviating environmental pollution, is readjusting the energy structure, solves residential electricity consumption from far-off regionsThe outstanding role of the aspects such as problem, is more and more subject to the attention of countries in the world and has obtained development and application widely. CloselyNian Lai China wind-power electricity generation growth momentum is swift and violent, and wind-powered electricity generation installation is doubled every year, the power generation performance of wind-powered electricity generation unit self,Power curve performance indications become the focus that wind-powered electricity generation unit manufacturer, owner and the investor pay close attention to gradually.

For the power generation performance of performance test means understanding wind-powered electricity generation unit reality, standard GB/T/T18451.2-2012" test of wind-powered electricity generation unit power characteristic " provided concrete method of testing. Measure simultaneously wind-powered electricity generation unit net power,The parameters such as wheel hub centre-height wind speed, wind direction, temperature, air pressure, draw the actual power curve of tested wind-powered electricity generation unit,It is V-P curve. For wind speed, the method providing in standard is at the tested wind turbine of tested wind-powered electricity generation unit upwind distanceOrganize 2.5 times of rotor diameter places installations and wind-powered machine unit hub centre-height with high anemometer tower, and pacify at anemometer tower topFill cup type airspeedometer, use wind speed that this cup type airspeedometer measures to carry out the wind speed of equivalent sign wheel hub centre-height.

Along with the capacity of wind-powered electricity generation unit is increasing, the blade of wind-powered electricity generation unit also lengthens gradually, and swept area is thereupon continuousBecome large. Current jumbo wind power generation unit blade generally exceedes 100 meters, uses wheel hub if still continue to use original standardThe wind speed of a location point of centre-height characterizes the wind speed of wind wheel swept surface, obviously cannot mate, and measuring accuracy is low.

Summary of the invention

In order to address the above problem, the invention provides a kind of method of testing and device of wind-powered electricity generation unit wind wheel equivalent wind speed,Can accurately reflect the wind wheel equivalent wind speed of whole swept surface wind conditions, thereby overcome the large-scale wind electricity power of the assembling unitThe defect that in curve test process, the certainty of measurement of wind speed is low, deviation is large.

The object of the invention is to adopt following technical proposals to realize:

A method of testing for wind-powered electricity generation unit wind wheel equivalent wind speed, comprising:

Determine wind-powered electricity generation unit wind wheel equivalent wind speed test point;

Obtain wind-powered electricity generation unit wind wheel equivalent wind speed.

Preferably, described definite wind-powered electricity generation unit wind wheel equivalent wind speed test point comprises: high according to tested tower of wind generating set cylinderDegree and impeller diameter, define different wind wheel equivalent wind speed measuring points.

Further, the different wind-powered electricity generation unit wind wheel equivalent wind speed measuring point of described definition specifically comprises: on wind-powered electricity generation unitThe anemometer tower that wind direction distance tested wind-powered electricity generation unit 2-4D place setting height(from bottom) is H+D/2; Respectively at anemometer tower H+D/2,H+D/3, H, H-D/3, H-D/2 installs position cup type airspeedometer, obtains air speed value vi by measurement.

Preferably, described in obtain wind-powered electricity generation unit wind wheel equivalent wind speed and comprise, according to the wind of wind-powered electricity generation unit actual installation positionThe coefficient of shear, uses kinetic energy fluxes theory to obtain the wind speed that characterizes wind wheel swept surface wind conditions.

Further, described in, obtain specifically comprising the steps: of wind wheel equivalent wind speed

It is H that wheel hub centre-height is set, and rotor diameter is D, calculates wind-powered electricity generation unit wind wheel equivalent wind speed, its expression formulaFor:

$v_{eq}={\left({\Σ}_{i=1}^{n_h}{v}_i^3\frac{A_i}{A}\right)}^{1/3}$

$A_i={\∫}_{z_i}^{z_{i+1}}c\left(z\right)dz=g\left(z_{i+1}\right)-g\left(z_i\right)$

$g\left(z\right)=(H-z)\sqrt{R^2-{(z-H)}^2}+R^{2}Arctan\left(\frac{z-H}{\sqrt{R^2-{(z-H)}^2}}\right)$

In formula: vi is the measuring wind at height i place; A is wind-powered electricity generation unit swept area of rotor; Ai is height iThe swept area at place; V_eqFor wind-powered electricity generation unit wind wheel equivalent wind speed; H is wheel hub centre-height; R is wind wheel radius.

A testing arrangement for wind-powered electricity generation unit wind wheel equivalent wind speed, comprising:

Locating module, for determining wind-powered electricity generation unit wind wheel equivalent wind speed test point;

Acquisition module, obtains wind-powered electricity generation unit wind wheel equivalent wind speed.

With immediate prior art ratio, excellent effect of the present invention is:

Test event, by arranging measuring point at differing heights place, cup type airspeedometer being installed, obtains whole wind wheel swept surfaceWind speed profile situation; And then draw the wind wheel that can accurately reflect whole swept surface wind conditions according to kinetic energy fluxes theoryEquivalent wind speed. Certainty of measurement that the method has solved wind speed in large-scale wind electricity power of the assembling unit curve test process is low, deviationLarge problem. Normalization and the accuracy of the test of wind-powered electricity generation unit power characteristic are effectively improved.

Brief description of the drawings

Fig. 1 is wind speed test position point schematic diagram provided by the invention;

Fig. 2 is the method for testing flow chart of wind-powered electricity generation unit wind wheel equivalent wind speed of the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention will be further described.

As shown in Figure 2, a kind of method of testing of wind-powered electricity generation unit wind wheel equivalent wind speed, is characterized in that, comprising:

Determine wind-powered electricity generation unit wind wheel equivalent wind speed test point;

According to tested tower of wind generating set cylinder height and impeller diameter, define different wind wheel equivalent wind speed measuring points. As figureShown in 1, the anemometer tower that is H+D/2 in wind-powered electricity generation unit upwind distance tested wind-powered electricity generation unit 2-4D place setting height(from bottom); PointNot at anemometer tower H+D/2, H+D/3, H, H-D/3, H-D/2 installs position cup type airspeedometer, obtains by measurementAir speed value vi.

Obtain wind-powered electricity generation unit wind wheel equivalent wind speed; It comprises: according to the wind shear coefficient of wind-powered electricity generation unit actual installation position,Use kinetic energy fluxes theory to obtain the wind speed that characterizes wind wheel swept surface wind conditions. Specifically comprise the steps:

It is H that wheel hub centre-height is set, and rotor diameter is D, calculates wind-powered electricity generation unit wind wheel equivalent wind speed, its expression formulaFor:

$v_{eq}={\left({\Σ}_{i=1}^{n_h}{v}_i^3\frac{A_i}{A}\right)}^{1/3}$

$A_i={\∫}_{z_i}^{z_{i+1}}c\left(z\right)dz=g\left(z_{i+1}\right)-g\left(z_i\right)$

$g\left(z\right)=(H-z)\sqrt{R^2-{(z-H)}^2}+R^{2}Arctan\left(\frac{z-H}{\sqrt{R^2-{(z-H)}^2}}\right)$

In formula: vi is the measuring wind at height i place; A is wind-powered electricity generation unit swept area of rotor; Ai is height iThe swept area at place; V_eqFor wind-powered electricity generation unit wind wheel equivalent wind speed; H is wheel hub centre-height; R is wind wheel radius.

A testing arrangement for wind-powered electricity generation unit wind wheel equivalent wind speed, comprising:

Locating module, for determining wind-powered electricity generation unit wind wheel equivalent wind speed test point;

Acquisition module, obtains wind-powered electricity generation unit wind wheel equivalent wind speed.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, to the greatest extentPipe has been described in detail the present invention with reference to above-described embodiment, and those of ordinary skill in the field still can be rightThe specific embodiment of the present invention is modified or is equal to replacement, and these do not depart from appointing of spirit and scope of the inventionWhat is revised or is equal to replacement, within its claim protection domain of the present invention all awaiting the reply in application.

Claims (6)

1. a method of testing for wind-powered electricity generation unit wind wheel equivalent wind speed, is characterized in that, comprising:

Determine wind-powered electricity generation unit wind wheel equivalent wind speed test point;

Obtain wind-powered electricity generation unit wind wheel equivalent wind speed.

2. the method for testing of a kind of wind-powered electricity generation unit wind wheel equivalent wind speed as claimed in claim 1, is characterized in that,Described definite wind-powered electricity generation unit wind wheel equivalent wind speed test point comprises: straight according to tested tower of wind generating set cylinder height and impellerFootpath, defines different wind wheel equivalent wind speed measuring points.

3. the method for testing of a kind of wind-powered electricity generation unit wind wheel equivalent wind speed as claimed in claim 2, is characterized in that,The different wind-powered electricity generation unit wind wheel equivalent wind speed measuring point of described definition specifically comprises: at the tested wind of wind-powered electricity generation unit upwind distanceThe anemometer tower that group of motors 2-4D place setting height(from bottom) is H+D/2; Respectively at anemometer tower H+D/2, H+D/3, H, H-D/3,H-D/2 installs position cup type airspeedometer, obtains air speed value vi by measurement.

4. the method for testing of a kind of wind-powered electricity generation unit wind wheel equivalent wind speed as claimed in claim 1, is characterized in that,The described wind-powered electricity generation unit wind wheel equivalent wind speed that obtains comprises, according to the wind shear coefficient of wind-powered electricity generation unit actual installation position, transportsObtain the wind speed that characterizes wind wheel swept surface wind conditions by kinetic energy fluxes theory.

5. the method for testing of a kind of wind-powered electricity generation unit wind wheel equivalent wind speed as claimed in claim 4, is characterized in that,Describedly obtain specifically comprising the steps: of wind wheel equivalent wind speed

It is H that wheel hub centre-height is set, and rotor diameter is D, calculates wind-powered electricity generation unit wind wheel equivalent wind speed, its expression formulaFor:

$v_{eq}={\left({\mathrm{\Σ}}_{i=1}^{n_h}{v}_i^3\frac{A_i}{A}\right)}^{1/3}$

$A_i={\∫}_{z_i}^{z_{i+1}}c\left(z\right)dz=g\left(z_{i+1}\right)-g\left(z_i\right)$

$g\left(z\right)=(H-z)\sqrt{R^2-{(z-H)}^2}+R^{2}Arctan\left(\frac{z-H}{\sqrt{R^2-{(z-H)}^2}}\right)$

In formula: vi is the measuring wind at height i place; A is that wind-powered electricity generation unit swept area of rotor: Ai is height iThe swept area at place; V_eqFor wind-powered electricity generation unit wind wheel equivalent wind speed; H is wheel hub centre-height; R is wind wheel radius.

6. a testing arrangement for wind-powered electricity generation unit wind wheel equivalent wind speed, is characterized in that, comprising:

Locating module, for determining wind-powered electricity generation unit wind wheel equivalent wind speed test point;

Acquisition module, obtains wind-powered electricity generation unit wind wheel equivalent wind speed.