CN105548614A - Angle installation error obtaining method of anemorumbograph - Google Patents
Angle installation error obtaining method of anemorumbograph Download PDFInfo
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- CN105548614A CN105548614A CN201510944265.1A CN201510944265A CN105548614A CN 105548614 A CN105548614 A CN 105548614A CN 201510944265 A CN201510944265 A CN 201510944265A CN 105548614 A CN105548614 A CN 105548614A
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- China
- Prior art keywords
- angle
- anemoclinograph
- wind speed
- error
- anemorumbograph
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
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- General Physics & Mathematics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an angle installation error obtaining method of an anemorumbograph. The method comprises the following steps that data collected by the anemorumbograph is preprocessed according to wind speed segments; an angle measuring error function delta=f(v) approximately equals a0+a1.v+a2.v2...+an.vn is formed; and the constant a0 is used as the angle installation error of the anemorumbograph. According to the invention, data collected by the anemorumbograph in the learning period is calculated, and fit into a polynomial function in the least square fitting method, the angle installation error of the anemorumbograph is obtained via the polynomial function, and thus, the problem that the angle installation error of the anemorumbograph is inconvenient to measure is solved. After that the angle installation error of the anemorumbograph is obtained, measurement error can be compensated to correct the practical wind deviation angle theta 1 in the blades of a blower fan, the measuring precision for the wind deviation angle of the blower fan is improved, and the labor and fund cost for reinstalling the anemorumbograph is reduced.
Description
The present invention relates to a kind of anemoclinograph, particularly a kind of acquisition methods of angle alignment error of anemoclinograph.
Background technology
Kinetic energy is converted into electric energy by aerogenerator, and target is generating as much as possible keeping blower fan to bear lower mechanical load while.Will successfully realize above target, key to allow draught fan impeller aim at wind direction accurately.
As shown in Figure 1-2, according to blower fan kinetic theory, when the constant and generator speed of wind speed is lower than rated speed, the generated output of blower fan is directly proportional to the cube of the cosine of wind deflection angle θ.If during wind direction bias free, the power that draught fan impeller obtains is Power1; When wind speed is constant, wind deflection angle is θ, the power that draught fan impeller obtains is Power2, then the two meets following formula:
Power2＝Power1×cos
3θ
Therefore, when wind deflection angle θ is 15 degree, the generated energy of about 10% can be brought to lose.In addition, departing from of impeller can cause the mechanical load at impeller and even whole blower fan uneven.This kind of load is compared other load and is so great that many, if can reduce, just can extend service life of fan, or allows existing blower fan drive larger impeller.
At present, on most of blower fan, wind deflection angle is determined by the anemoclinograph be arranged on above cabin.But cross in engineering at the actual motion of blower fan, the wind deflection angle measured by anemoclinograph and there is error between the actual wind deflection angle at impeller place.
As shown in Figure 3, because anemoclinograph measures is the wind deflection angle θ of fan engine room afterbody
2, and fan master control system is it is desirable that the actual wind deflection angle θ at draught fan impeller place
1, namely angle measurement error is between the two expressed as:
δ
θ＝θ
2-θ
1
Cause a lot of because have of wind deflection, wherein, the angle alignment error of anerovane is exactly one of factor of the angle measurement error affecting anemoclinograph (as shown in Figure 4).
At present, the wind deflection angle θ that measures according to anerovane of master control system
2control fan engine room to wind (driftage controls), and the wind deflection angle that actual needs is corrected is θ
1.If can angle alignment error be recorded exactly and compensate, then can improve the precision that draught fan impeller aims at wind direction.
Angle alignment error refer to the zero-bit of anemoclinograph and blower fan heading inconsistent, there is a fixed error by making the actual measurement wind deflection angle of anemoclinograph and actual wind deflection angle in this.For this reason, how to measure and to compensate this error, raising draught fan impeller is of very high actual application value to wind precision.
Under normal circumstances, there is the scale for aiming at the installation place of anemoclinograph, and when anemoclinograph is installed first, all can carry out necessary measurement and demarcation, to ensure that its zero-bit is consistent with blower fan heading.But after blower fan puts into operation, As time goes on, due to cabin vibrations or the impact of other factors, the installation zero-bit of anemoclinograph can change and offset, and then generation angle alignment error.
For revising this error, Engineering Service personnel are needed to climb up the severe nacelle top of operating mode, according to the angle alignment error of the tape measure anemoclinograph of installation place.When scale comes off because of long wind and rain and vibrations, staff also needs the angle alignment error to anemoclinograph by high-precision angle measurement and location instrument to measure, and then adds manpower and materials and fund cost.
At present, except employing is artificial and the angle alignment error of high precision angle-measuring positioning system to anemoclinograph is measured, there is no measuring method more easily.How the angle alignment error of the determination anerovane of convenient fast and low-cost, yet there are no the report of correlation technique.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention will design a kind of acquisition methods of angle alignment error of anemoclinograph, measurement means need not be adopted just can to determine the angle alignment error of anerovane exactly, to improve the precision that draught fan impeller aims at wind direction.
Great many of experiments shows, the angle measurement error δ of anemoclinograph is the polynomial function of wind speed v, when considering angle alignment error and the machine trail error of anemoclinograph, is expressed as angle measurement error function:
δ＝f(v)≈a
0+a
1·v+a
2·v
2+…+a
n·v
n
Because angle alignment error belongs to fixed error, this error can not affect by wind speed, wake flow, microcosmic structure equal error, then the constant ɑ in angle measurement error function δ
0namely angle alignment error is represented.
In order to obtain angle alignment error, technical scheme of the present invention is as follows: a kind of acquisition methods of angle alignment error of anemoclinograph, comprises the following steps:
A, data prediction
In learning cycle, the data that anemoclinograph collects are classified according to wind speed section, at different wind speed section V
idistribution curve between the power that the actual measurement wind deflection angle of statistics anemoclinograph and impeller place obtain, and obtain wind speed section V at curve peak place
icorresponding angle measurement error δ
i, in formula, i represents the sequence number of wind speed section, i=1,2,3 ..., m, m represent divided wind speed section sum; Described data comprise wind speed, the actual measurement wind deflection angle of anemoclinograph and impeller place power;
B, angulation measuring error function
B11, establish n=1
B12, employing least square fitting method, to each wind speed section V in steps A
iunder the angle measurement error δ of anemoclinograph
icarry out least square fitting, form the angle measurement error function of anemoclinograph:
δ＝f(v)≈a
0+a
1·v+a
2·v
2+…+a
n·v
n
In formula, ɑ
0, ɑ
1..., ɑ
nfor constant, v is real-time wind speed;
If the overall relative error after B13 matching is better than 0.01%, then go to step C; Otherwise make n=n+1, go to step B12;
C, the constant ɑ will obtained in step B
0as the angle alignment error of anemoclinograph.
Compared with prior art, the present invention has following beneficial effect:
1, the data gathered at learning cycle by anemoclinograph due to the present invention are added up, and adopt least square fitting method to fit to a polynomial function, the angle alignment error of anemoclinograph is obtained, the problem that the angle alignment error inconvenience this method solving anemoclinograph is measured finally by this polynomial function.
2, obtained the angle alignment error of anemoclinograph by the present invention after, can measurement Error Compensation be carried out on the one hand, revise the actual wind deflection angle θ at draught fan impeller place
1, thus improve the measuring accuracy to draught fan impeller place wind direction, thus save the human cost and fund cost of reinstalling anemoclinograph; On the other hand also can reinstall anemoclinograph, make the zero-bit of anemoclinograph and blower fan heading completely the same.
Accompanying drawing explanation
The present invention has 8, accompanying drawing, wherein:
Fig. 1 is that fan engine room is just to wind direction schematic diagram.
Fig. 2 is fan engine room driftage schematic diagram.
Fig. 3 is actual wind speed and actual measurement wind speed schematic diagram.
Fig. 4 is anemoclinograph angle alignment error schematic diagram.
Fig. 5 is the relation curve schematic diagram of wind direction drift angle and draught fan impeller power.
Fig. 6 is data prediction schematic diagram.
Fig. 7 is different wind speed section angle measurement error curve synoptic diagrams.
Fig. 8 is angle measurement error function (curve) schematic diagram after least square fitting.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described: according to method step of the present invention, angle measurement error function δ=f (v) the ≈ a that anemoclinograph obtains
0+ a
1v+a
2v
2+ ... + a
nv
n, this function shows that the angle measurement error function δ of anemoclinograph is the repeatedly polynomial function of wind speed.Angle alignment error refer to the zero-bit of anemoclinograph and blower fan heading inconsistent, there is a fixed error by making the actual measurement wind deflection angle of anemoclinograph and actual wind deflection angle in this, as shown in Figure 4.This error belongs to fixed error, can not affect, use constant ɑ by wind speed, wake flow, microcosmic structure equal error
0represent.
When aerogenerator is in normal power generation state, and wind speed and position, cabin keep constant, if now draught fan impeller place is without wind deflection, then the power that draught fan impeller place absorbs is PowerStandard; If now the wind deflection angle at draught fan impeller place is θ
1, then the power P owerRotor that draught fan impeller place absorbs can be expressed as:
PowerRotor＝PowerStandard×cos
3θ
1
Then under constant wind speed (for 10m/s in Fig. 5), the wind deflection angle θ at draught fan impeller place
1and the relation between the power P owerRotor that draught fan impeller place absorbs can be expressed as the block curve in Fig. 5, and this curve can at wind deflection angle θ
1maximal value A is obtained when=0 °
1.
Meanwhile, the wind deflection angle θ measured by anemoclinograph
2and the relation between the power P owerRotor that draught fan impeller place absorbs can be expressed as the dashed curve in Fig. 5, because wind deflection angle θ
2with actual wind deflection angle θ
1between there is angle measurement error δ
θ, so wind deflection angle θ
2and the funtcional relationship between PowerRotor is:
PowerRotor＝PowerStandard×cos
3(θ
2-δ
θ)
Namely in Fig. 5, dashed curve will at θ
2=δ
θplace obtains maximal value A
2, it obtains maximal value A
2time corresponding wind deflection angle θ
2be the angle measurement error δ of anemoclinograph
θ.(curve in Fig. 5 represents that this blower fan is when 10m/s wind speed, and the angle measurement error of anemoclinograph is 5 °).
According to the aerodynamic principle of blower fan, when wind speed changes, the series of parameters such as blower fan wake flow can be made to change, cause the angle measurement error of anemoclinograph to change.And in actual condition, wind speed and direction misalignment angle is all moment change, and anemoclinograph will add up the data such as the wind deflection angle of blower fan, wind speed and power with certain frequency for this reason.
As shown in Figure 6, collected data are classified according to wind speed section by anemoclinograph, at different wind speed section V
icapital calculates corresponding angle measurement error δ
i, its principle as shown in Figure 7.
Fig. 7 represents, V under each wind speed section
i(show only wherein 6 wind speed sections in figure), can obtain the curved line relation between an actual measurement wind speed and impeller power, and obtain angle measurement error δ at curve peak place
i.By all wind speed section V
iunder angle measurement error δ
igathers, then least square method can be used to carry out matching to it, and then acquisition angle measurement error function is:
δ＝f(v)＝0.1v
2+1.5v-10
As shown in Figure 8, this function shows, in fit procedure, as n=2, the overall relative error of least square fitting result is better than 0.01%, and namely this angle measurement error function is the quadratic function of wind speed, and, constant term in expression formula is now-10, and namely the angle alignment error of the anemoclinograph of this blower fan is-10 °.
Claims (1)
1. an acquisition methods for the angle alignment error of anemoclinograph, is characterized in that: comprise the following steps:
A, data prediction
In learning cycle, the data that anemoclinograph collects are classified according to wind speed section, at different wind speed section V
idistribution curve between the power that the actual measurement wind deflection angle of statistics anemoclinograph and impeller place obtain, and obtain wind speed section V at curve peak place
icorresponding angle measurement error δ
i, in formula, i represents the sequence number of wind speed section, i=1,2,3 ..., m, m represent divided wind speed section sum; Described data comprise wind speed, the actual measurement wind deflection angle of anemoclinograph and impeller place power;
B, angulation measuring error function
B11, establish n=1
B12, employing least square fitting method, to each wind speed section V in steps A
iunder the angle measurement error δ of anemoclinograph
icarry out least square fitting, form the angle measurement error function of anemoclinograph:
δ＝f(v)≈a
0+a
1·v+a
2·v
2+…+a
n·v
n
In formula, ɑ
0, ɑ
1..., ɑ
nfor constant, v is real-time wind speed;
If the overall relative error after B13 matching is better than 0.01%, then go to step C; Otherwise make n=n+1, go to step B12;
C, the constant ɑ will obtained in step B
0as the angle alignment error of anemoclinograph.
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|---|---|---|---|
| CN201510944265.1A CN105548614A (en) | 2015-12-16 | 2015-12-16 | Angle installation error obtaining method of anemorumbograph |
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|---|---|---|---|
| CN201510944265.1A CN105548614A (en) | 2015-12-16 | 2015-12-16 | Angle installation error obtaining method of anemorumbograph |
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|---|---|
| CN105548614A true CN105548614A (en) | 2016-05-04 |
Family
ID=55827938
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|---|---|---|---|
| CN201510944265.1A Pending CN105548614A (en) | 2015-12-16 | 2015-12-16 | Angle installation error obtaining method of anemorumbograph |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044758A (en) * | 2018-10-12 | 2020-04-21 | 苏州捷杰传感技术有限公司 | Acceleration sensor output value correction method and acceleration sensor |
| EP3696404A4 (en) * | 2018-02-28 | 2021-01-20 | Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. | Method, device and system for determining angle-to-wind deviation and correcting angle-to-wind |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3696404A4 (en) * | 2018-02-28 | 2021-01-20 | Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. | Method, device and system for determining angle-to-wind deviation and correcting angle-to-wind |
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| CN111044758A (en) * | 2018-10-12 | 2020-04-21 | 苏州捷杰传感技术有限公司 | Acceleration sensor output value correction method and acceleration sensor |
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Application publication date: 20160504 |
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