CN105205265A - Measuring method of optimum rotating speed and torque tracking curve of vertical-axis wind generator set - Google Patents
Measuring method of optimum rotating speed and torque tracking curve of vertical-axis wind generator set Download PDFInfo
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Abstract
The invention relates to a measuring method of an optimum rotating speed and torque tracking curve of a vertical-axis wind generator set. The method includes the steps that 1, the optimum tip speed ratio and power coefficient of the wind generator set to be measured are estimated according to theoretical calculation results and series of similar experience; 2, an estimated rotating speed and torque tracking curve is determined according to the estimated optimum tip speed ratio and power coefficient; 3, a group of rotating speed and torque tracking curves with different zooming degrees are obtained by performing X-axis-direction zooming on the estimated rotating speed and torque tracking curve; 4, the magnitudes of real output power are compared after the wind generator set operates tracking the different rotating speed and torque tracking curves, wherein the rotating speed and torque tracking curve with the maximum real output power is the optimum rotating speed and torque tracking curve. By means of the method, when the wind generator set operates in a real natural wind field, the inherent optimum rotating speed and torque tracking curve can be obtained.
Description
Technical field
The optimum speed torque that the present invention relates to a kind of aerogenerator is followed the tracks of, especially a kind of measuring method of optimum speed torque aircraft pursuit course of vertical axis aerogenerator group.
Background technology
Vertical axis aerogenerator adopts H type Da Lie version, and its wind wheel part-structure schematic diagram as depicted in figs. 1 and 2.It adopts H type fixed-wing prismatic blade 2, and its blade 2 number is 2 ~ 4; Its each blade 2 is fixed value α with the angle of attack of sense of rotation.Horizontal cross 3 connecting link changes the aerodynamic force on H type prismatic blade into the torque acted on the generator amature of wind wheel center.The ratio radially projecting area of blade 3 on blade geometry central rotation swept surface being accounted for whole swept surface is defined as solidity SD, the solidity SD < 0.2 of this wind power generating set.The radius scanning circle (cylinder) of wind wheel blade center line 4 is R, and blade height is H, and the planimetric area of swept surface is: A=2RH
The ratio of wind power generating set blade rotary linear velocity and wind speed is defined as tip-speed ratio TSR; This wind power generating set operating air velocity scope is from incision wind speed to wind rating, then to cut-out wind speed, such as typical data has: incision wind speed is 3m/s, and wind rating is 12m/s, and cut-out wind speed is 20m/s.Under arbitrary constant wind speed V of wind power generating set under cut-out wind speed, wind speed round and the relation curve exported between machine torque have following features:
1., under a certain tip-speed ratio TSRTmax, when namely wind speed round is NTmax=9.55*V/R*TSRTmax, wind wheel exports machine torque and reaches maximum Tmax, and this working point is called maximum torque point;
2. at tip-speed ratio between 0 ~ TSRTmax, namely wind speed round is positioned at 0 ~ NTmax, wind wheel export machine torque there is a minimum point (TSRTmin, Tmin), this Tmin < Tmax/4; The wind speed round that TSRTmin is corresponding is NTmin=9.55V/RTSRTmin;
3., when a certain tip-speed ratio TSRPmax, namely wind speed round is NPmax=9.55VW/RTSRPmax, and wind wheel output power reaches maximum Pmax; NPmax > NTmax, this working point is called maximum power point, and tip-speed ratio now can be called best tip-speed ratio;
4. when wind wheel is unloaded, rotating speed reaches the highest, is N0, N0 > NPmax;
5. between NTmin and NTmax, wind wheel Driving Torque monotone increasing;
6., between NTmax and N0, wind wheel Driving Torque dullness reduces;
Fig. 3 is shown in by the relation curve schematic diagram of above-mentioned rotating speed N and mechanical output T, and this curve is called speed torque characteristic curve.
When constant wind speed gets different value, one group of speed torque characteristic curve can be obtained, as shown in Figure 4, expression is the one group speed torque characteristic curve of different wind speed when being respectively V1, V2, V3, V4 (V1 < V2 < V3 < V4).Maximum power point on speed torque characteristic curve under each constant wind speed links up, and just can obtain optimum speed torque aircraft pursuit course.Under wind rating, if the generator electromagnetic braking torque energy of wind power generating set is followed the tracks of rapidly by the torque functional value of the real-time rotate speed recorded on this optimum speed torque aircraft pursuit course in real time, then this wind power generating set at output mechanical power as much as possible, and then can send electric power as much as possible.Suppose that V3 is wind rating, then the optimum speed torque under rated power is followed the tracks of as shown in Fig. 4 heavy line part.On wind rating, follow the tracks of if continue to follow the tracks of optimum speed torque, then the electromagnetic braking torque needing generator to provide can be caused to be greater than its design maximum, cause wind power generating set not controlled.Therefore, optimum speed torque aircraft pursuit course is no longer followed the tracks of on wind rating, but by keeping or reduce the rotating speed of wind power generating set, wind power generating set is made not to be operated near best tip-speed ratio, blade is in stall running status in the most of the time, the energy that wind power generating set obtains from wind reduces, the feature that declines of torque at the low rotational speed of speed torque characteristic curve under constant wind speed can be utilized, the torque of the wind power generating set when wind speed is larger is made to remain on lower value, and this lower value is lower than the design maximum torque value of generator, thus ensure that wind power generating set can on wind rating, safe operation under cut-out wind speed.
In order to wind power generating set the state of maximum power output can be run under wind rating, therefore need to obtain optimum speed torque aircraft pursuit course; And according to above-mentioned analysis in order to obtain optimum speed torque aircraft pursuit course, just need to know the speed torque characteristic curve under each constant wind speed.
In fact, after a vertical axis aerogenerator group Design and manufacture completes, speed torque characteristic under its each constant wind speed and optimum speed torque aircraft pursuit course are in esse inherent characteristics, just accurately can not draw only by project navigator, need could to be obtained and be verified design load by actual measurement.And in practice, in physical environment, there is no constant wind speed, also just can not measure.At wind-tunnel environment, manually can manufacture constant wind speed, but receive the impact of wind-tunnel size and bolus effect, larger vertical axis aerogenerator group can not obtain accurate result by wind tunnel test.Therefore need to find a kind of method, when wind power generating set can be made can to run in naturally actual wind field, obtain its intrinsic optimum speed torque aircraft pursuit course.
Summary of the invention
The present invention is the measuring method of the optimum speed torque aircraft pursuit course that will provide a kind of vertical axis aerogenerator group, obtains its intrinsic optimum speed torque aircraft pursuit course when wind power generating set can be run in naturally actual wind field.
Technical scheme of the present invention is: a kind of measuring method of optimum speed torque aircraft pursuit course of vertical axis aerogenerator group, and its step is as follows:
(1) according to the experience of the calculated results and Similar sequences, best tip-speed ratio and the power coefficient of wind power generating set to be measured is estimated;
(2) the rotational speed and torque aircraft pursuit course estimated is determined according to the best tip-speed ratio estimated and power coefficient;
(3) by carrying out the convergent-divergent of X-direction to the rotational speed and torque aircraft pursuit course estimated, the rotational speed and torque aircraft pursuit course of one group of different zoom degree is obtained;
(4) wind power generating set presses the rotational speed and torque aircraft pursuit course actual motion of different zoom degree, and obtains aerogenerator the actual running results corresponding to every bar rotational speed and torque aircraft pursuit course; Multiple wind speed interval is at equal intervals divided between incision wind speed and wind rating, then corresponding to different rotational speed and torque aircraft pursuit courses actual result carries out statistical treatment, obtain the rotational speed and torque aircraft pursuit course that average output power in each wind speed interval is maximum, and then obtain the optimum speed torque aircraft pursuit course between incision wind speed and wind rating.
The concrete grammar of above-mentioned steps (2) is:
Be located at incision wind speed and wind rating the best tip-speed ratio estimated be as TSR, the power coefficient estimated is CP, wind power generating set is needed the wind speed section optimizing the power exported be set to { V|V1 < V < V2}, wherein V1 is incision wind speed, V2 is wind rating, R is the swept surface radius of wind wheel blade, and A is the planimetric area in wind wheel blade sweeping face;
The rotating speed of the corresponding TSR of wind power generating set is set to N;
N＝V·TSR/R·9.55
Corresponding output power is: P=0.5 × 1.225AV
3cP
Corresponding torque is: T=P/N9.55
Thus obtain: T=6.716 × 10
-3a (R/TSR)
3cPN
3/ N=CKN
2;
Wherein CK=6.716 × 10
-3a (R/TSR)
3cP
Above-mentioned T=CKN
2be the rotational speed and torque aircraft pursuit course estimated.
The concrete grammar of above-mentioned steps (3) is:
T=CKN
2deformation curve be T=CK (KXN)
2, KX is deformation coefficient, and its value is monotone increasing arithmetic progression or the Geometric Sequence of value centered by 1.0, and the ratio of adjacent two numbers is not more than 1.11, and total number is not more than 7.
The concrete grammar of above-mentioned steps (4):
A () gathers and pre-service vertical axis aerogenerator group service data
Adopt the speed continuous acquisition data unit operation of at least more than 0.5Hz: wind speed, rotating speed, power; And pre-service service data, comprise mean value, standard deviation, maximal value, minimum value; The total sampling time often organizing pretreated data group, between 0.5 ~ 10min, is that one-period forms garbled data group by the data of continuous coverage with 10min;
(b) garbled data
Garbled data comprises mean wind speed VSX, mean speed NSX, average output power PSX, kinetic energy change power P DSX in this 10min;
Being located at first group of pretreated rotating speed mean value when 10min starts is NS, at the end of last to organize pretreated rotating speed mean value be NE, then kinetic energy change power is:
PDSX=0.5J ((NS/9.55)
2-(NE/9.55)
2)/600, wherein J is total inertia of wind wheel rotating part;
Definition PJSX=PSX-PDSX, PJSX represent and are called average net power output PJSX by the power that the wind wheel in this 10min absorbs from wind, and often organizing 10min garbled data all needs calculating and store this data;
(c) statistics
After collection terminates, all garbled datas dropping into each wind speed interval are averaged, obtain the statistics of this wind speed interval, be i.e. mean wind speed Vi, the mean speed Ni of this wind speed interval and average net power Pi; Mean wind speed Vi is on average formed by all VSX falling into this interval; Mean speed Ni is on average formed by all NSX falling into this interval; Average net power Pi is on average formed by all PJSX falling into this interval; Above-mentioned mean wind speed Vi, mean speed Ni and average net power Pi, conversion is to wind speed interval intermediate value Vbi, i.e. Nbi=NiVbi/Vi; Pbi=Pi (Vbi/Vi)
3;
In order to distinguish the measurement result of different K X value trace curve, data obtained above are expressed as:
(Vbi，Nbi
(KX)，Pbi
(KX))，i＝1,2,3,……；KX＝0.81,0.9,1.0,1.1,1.21；
D power P bi that in () more same wind speed interval, different K X curve obtains
(KX)), obtain data group (Nbi in wind speed interval i
(KX), Pbi
(KX)) middle Pbi
(KX)the KX that the maximum data group of output power is corresponding, presses T=CK (KXN) in this interval
2follow the tracks of and run, obtain best power and export; Nbi
(KX)substitute into T=CK (KXN)
2can obtain:
Tbi
(KX)=CK (KXNbi
(KX))
2; Thus the rotational speed and torque working point (Nbi obtained in this wind speed interval
(KX), Tbi
(KX))
E () passes through the method for statistics and mathematic curve matching, the working point (Nbi of all wind speed interval
(KX), Tbi
(KX)) fitting to a quafric curve, this quafric curve is best rotating speed rotational speed and torque aircraft pursuit course.
The invention has the beneficial effects as follows: when method of the present invention can make wind power generating set can run in naturally actual wind field, obtain its intrinsic optimum speed torque aircraft pursuit course.
Accompanying drawing explanation
Fig. 1 is the vertical view of vertical axis aerogenerator group wind wheel part;
Fig. 2 is the side view of vertical axis aerogenerator group wind wheel part;
Fig. 3 is the speed torque characteristic curve map under arbitrary constant wind speed;
Fig. 4 is speed torque characteristic curve map under different wind speed and optimum speed torque trace plot;
Fig. 5 is the rotational speed and torque trace plot estimated;
Fig. 6 is the optimum speed torque trace plot of one group of different distortion.
Embodiment
The measuring method of the optimum speed torque aircraft pursuit course of vertical axis aerogenerator group of the present invention, concrete steps are as follows:
(1) according to the experience of the calculated results and Similar sequences, best tip-speed ratio and the power coefficient of determining wind power generating set to be measured is estimated.The best tip-speed ratio initial value being located at each wind speed between incision wind speed and wind rating is TSR, and power coefficient initial value is CP.{ V|V1 < V < V2}, wherein V1 is generally incision wind speed, and V2 is generally wind rating wind power generating set to be needed the wind speed section optimizing the power exported be set to.R is the swept surface radius of wind wheel blade.A is the planimetric area in wind wheel blade sweeping face;
The rotating speed of the corresponding TSR of wind power generating set is set to N;
N＝V·TSR/R·9.55
Corresponding output power is:
P＝0.5×1.225A·V
3·CP
Corresponding torque is:
T＝P/N·9.55
Thus obtain
T＝6.716×10
-3A·(R/TSR)3·CP·N
3/N＝CK·N
2；
Wherein CK=6.716 × 10
-3a (R/TSR)
3cP
Adopt T=CKN
2deformation curve race T=CK (KXN)
2alternatively aircraft pursuit course, every bar curve is named with deformation coefficient KX respectively, the value of KX can be the monotone increasing arithmetic progression of value centered by 1.0 or Geometric Sequence or other ordered series of numbers, the ratio (plurality compares decimal) of adjacent two numbers is not more than 1.11, and total number is not more than 7; One class value of such as KX is: { 0.9
2, 0.9,1,1.1,1.1
2;
If the wind rating of a vertical axis aerogenerator group is 12m/s, designing best tip-speed ratio is 2.5, and rotor diameter is 1.5 meters, and wind wheel blade length is 1.0 meters, and power coefficient is: 0.15, rated power:
P＝0.5×1.225×1.5×0.15×12×12×12＝238W；
Rated speed is:
N＝2.5×12/0.75×9.55＝382r/min
Nominal torque is: T=P/n9.55=5.95Nm
Incision wind speed is 3m/s.Cut-out wind speed is assumed to be 20m/s.At 12m/s and more than 20m/s, wind power generating set is run according to the method for power-limiting; At more than 20m/s, wind power generating set cuts out braking.At incision more than wind speed 3m/s, wind rating below 12m/s, wind power generating set need be followed the tracks of optimum speed torque aircraft pursuit course and be run with Maximum Power Output.Therefore have:
CK＝6.716×10
-3×1.5×(0.75/2.5)
3×0.15＝4.08×10
-5
Following initial speed torque aircraft pursuit course T=CKN can be obtained
2;
Incision rotating speed is N1=2.5 × 3/0.75 × 9.55=95.5r/min
Between incision rotating speed and rated speed, choose multiple point, initial speed torque aircraft pursuit course data can be obtained, as table 1:
| Sequence number | Rotating speed (r/min) | Torque (Nm) |
| 1 | 95.5 | 0.372 |
| 2 | 111.4 | 0.506 |
| 3 | 127.3 | 0.662 |
| 4 | 143.3 | 0.837 |
| 5 | 159.2 | 1.034 |
| 6 | 175.1 | 1.251 |
| 7 | 191.0 | 1.488 |
| 8 | 206.9 | 1.747 |
| 9 | 222.8 | 2.026 |
| 10 | 238.8 | 2.326 |
| 11 | 254.7 | 2.646 |
| 12 | 270.6 | 2.987 |
| 13 | 286.5 | 3.349 |
| 14 | 302.4 | 3.731 |
| 15 | 318.3 | 4.135 |
| 16 | 334.3 | 4.558 |
| 17 | 350.2 | 5.003 |
| 18 | 366.1 | 5.468 |
| 19 | 382.0 | 5.954 |
Its initial speed torque aircraft pursuit course represented as shown in Figure 5.
By carrying out the convergent-divergent of X-direction to rotational speed and torque aircraft pursuit course, its deformation curve bunch is T=CK (KXN)
2.
When KX is { 0.9
2, 0.9,1,1.1,1.1
2time each curve as shown in Figure 6.
Because actual optimum speed torque aircraft pursuit course is unknown, therefore the rotational speed and torque aircraft pursuit course of above-mentioned curve respectively as the tracking of wind power generating set, all press it and run a period of time, the method provided according to the test of GB/T18451.2-2012 power characteristic of wind driven generator set and the small-sized vertical axis wind power generation group of GB/T29494-2013 measures the powertrace of this wind power generating set.
Anemoscope and wind indicator need be set up in the outside of wind power generating set, to measure and to obtain the wind speed of effectively the wind comes from of wind power generating set; The temperature also needing measurement wind power generating set the wind comes from and atmospheric pressure, to obtain the atmospheric density of real-time change;
When power measurement, often the interval of wind speed is decided to be 0.5m/s.The mean wind speed of wind speed in sometime press wind speed interval ownership partition, which is fallen interval, the accumulated value in which interval adds 1.Interval wind speed is represented by intermediate value.The method is called Bean's method (bins).
Employing 0.5Hz or faster sampling rate continuous acquisition data unit operation, as wind speed, rotating speed, power; For temperature, the isoparametric measurement of air pressure can by lower sampling rate, but at least per minute sampling should be carried out;
The data that data acquisition system (DAS) store sample obtains or pretreated data group.Pretreated data should comprise mean value, standard deviation, maximal value, minimum value etc.; Often organize total sampling time of pretreated data group between 0.5 ~ 10min, and be can be divided evenly 10min data value.
Be that one-period forms garbled data group by the data of continuous coverage with 10min.
If wind power generating set does not work when sampled data; Fault after test macro occurs; Wind direction in measurement sector, then should not deleted the data group of above situation from database.
The data gathered under some particular job situations (as very coarse in caused blade surface due to dust, smog, insect, ice and snow) or atmospheric climate condition (as precipitation, pneumatic shear) need to revise as special data.
Garbled data comprises mean wind speed VSX, mean speed NSX, average output power PSX, kinetic energy change power P DSX in this 10min.
Kinetic energy change power be this 10min from start to end, because speed changes, the release of wind power generating set rotating part kinetic energy or absorbed power are just with delivered power; If first group of pretreated rotating speed mean value is NS when this 10min starts, at the end of last to organize pretreated custom mean value be NE, then kinetic energy change power is:
PDSX=0.5J ((NS/9.55)
2-(NE/9.55)
2)/600, wherein J is total inertia of wind wheel rotating part;
Definition PJSX=PSX-PDSX, PJSX represent and are called average net power output PJSX by the power that the wind wheel in this 10min absorbs from wind, and often organizing 10min garbled data all needs calculating and store this data;
The test data filtered out will sort according to bins method, selected data group should cover from lower than incision wind speed 1m/s in the wind speed range of 1.5 times of wind speed during wind power generating set 80% specified output.Wind speed range should be divided into 0.5m/sbins continuously, the integral multiple of 0.5m/s during central value.
If each bins is at least containing the sampled data value of 30min in data group, and all comprises wind power generating set in test period and have 180 hours at least the working time in wind speed range, then this data group is just complete.
After collection terminates, first wind speed and power are converted standard air density according to the atmospheric density determined by atmospheric pressure and air themperature, then all garbled datas dropping into each wind speed interval can be averaged, obtain the statistics of this wind speed interval, i.e. mean wind speed Vi, the mean speed Ni of this wind speed interval and average net power Pi; Mean wind speed Vi is on average formed by all VSX falling into this interval; Mean speed Ni is on average formed by all NSX falling into this interval; Average net power Pi is on average formed by all PJSX falling into this interval.
For the ease of comparing the powertrace of following the tracks of different K X curve and obtaining, need above-mentioned mean wind speed Vi, mean speed Ni and average net power Pi, conversion is to wind speed interval intermediate value Vbi, i.e. Nbi=NiVbi/Vi; Pbi=Pi (Vbi/Vi)
3;
In order to distinguish the measurement result of different K X value trace curve, data obtained above are expressed as:
(Vbi
(KX)，Nbi
(KX)，Pbi
(KX))，i＝1,2,3,……；KX＝0.81,0.9,1.0,1.1,1.21；
Such as, in this example, i=1, represents wind speed interval 3 (2.75,3.25); I=2, represents wind speed interval 3.5 (3.25,3.75); By that analogy, such as i=19 represents wind speed interval 12 (11.75,12.25).
The power that in more same wind speed interval, different K X curve obtains, can obtain the KX curve obtaining peak power in this wind speed interval, so just obtains the KX value that interval i is corresponding; If namely press T=CK (KXN) in this interval
2follow the tracks of and run, best power can be obtained and export.Data group (Nbi is obtained in this wind speed interval
(KX), Tbi
(KX)), wherein T=CK (KXNbi
(KX))
2.
By statistics and the method for mathematic curve matching, the data point (Nbi of all wind speed interval
(KX), Tbi
(KX)) fitting to a quafric curve, this quafric curve is exactly optimum speed torque aircraft pursuit course.
Claims (4)
1. a measuring method for the optimum speed torque aircraft pursuit course of vertical axis aerogenerator group, it is characterized in that, concrete steps are as follows:
(1) according to the experience of the calculated results and Similar sequences, best tip-speed ratio and the power coefficient of wind power generating set to be measured is estimated;
(2) the rotational speed and torque aircraft pursuit course estimated is determined according to the best tip-speed ratio estimated and power coefficient;
(3) by carrying out the convergent-divergent of X-direction to the rotational speed and torque aircraft pursuit course estimated, the rotational speed and torque aircraft pursuit course of one group of different zoom degree is obtained;
(4) wind power generating set presses the rotational speed and torque aircraft pursuit course actual motion of different zoom, and obtains aerogenerator the actual running results corresponding to every bar rotational speed and torque aircraft pursuit course; Multiple wind speed interval is at equal intervals divided between incision wind speed and wind rating, then corresponding to different rotational speed and torque aircraft pursuit courses actual result carries out statistical treatment, obtain the rotational speed and torque aircraft pursuit course that average output power in each wind speed interval is maximum, and then obtain the optimum speed torque aircraft pursuit course between incision wind speed and wind rating.
2. the measuring method of the optimum speed torque aircraft pursuit course of vertical axis aerogenerator group according to claim 1, is characterized in that, the concrete grammar of described step (2) is:
The best tip-speed ratio of estimating being located at each wind speed interval between incision wind speed and wind rating is TSR, the power coefficient estimated is CP, the wind speed section that wind power generating set needs best power to export is set to { V|V1 < V < V2}, wherein V1 is incision wind speed, V2 is wind rating, R is the swept surface radius of wind wheel blade, and A is the planimetric area in wind wheel blade sweeping face;
The rotating speed of the corresponding TSR of wind power generating set is set to N;
N＝V·TSR/R·9.55
Corresponding output power is: P=0.5 × 1.225AV
3cP
Corresponding torque is: T=P/N9.55
Thus obtain: T=6.716 × 10
-3a (R/TSR)
3cPN
3/ N=CKN
2;
Wherein CK=6.716 × 10
-3a (R/TSR)
3cP
Above-mentioned T=CKN
2be the rotational speed and torque aircraft pursuit course estimated.
3. the measuring method of the optimum speed torque aircraft pursuit course of vertical axis aerogenerator group according to claim 1, is characterized in that, the concrete grammar of described step (3) is:
T=CKN
2deformation curve be T=CK (KXN)
2, KX is deformation coefficient, and its value is monotone increasing arithmetic progression or the Geometric Sequence of value centered by 1.0, and the ratio of adjacent two numbers is not more than 1.11, and total number is not more than 7.
4. the measuring method of the optimum speed torque aircraft pursuit course of vertical axis aerogenerator group according to claim 1, is characterized in that, the concrete grammar of described step (4) is:
(1) collection and pre-service vertical axis aerogenerator group service data
Adopt the speed continuous acquisition data unit operation of at least more than 0.5Hz: wind speed, rotating speed, power; And pre-service service data, comprise mean value, standard deviation, maximal value, minimum value; The total sampling time often organizing pretreated data group, between 0.5 ~ 10min, is that one-period forms garbled data group by the data of continuous coverage with 10min;
(2) garbled data
Garbled data comprises mean wind speed VSX, mean speed NSX, average output power PSX, kinetic energy change power P DSX in this 10min;
Being located at first group of pretreated rotating speed mean value when 10min starts is NS, at the end of last to organize pretreated rotating speed mean value be NE, then kinetic energy change power is:
PDSX=0.5J ((NS/9.55)
2-(NE/9.55)
2)/600, wherein J is total inertia of wind wheel rotating part;
Definition PJSX=PSX-PDSX, PJSX represent and are called average net power output PJSX by the power that the wind wheel in this 10min absorbs from wind, and often organizing 10min garbled data all needs calculating and store this data;
(3) statistics
After collection terminates, all garbled datas dropping into each wind speed interval are averaged, obtain the statistics of this wind speed interval, be i.e. mean wind speed Vi, the mean speed Ni of this wind speed interval and average net power Pi; Mean wind speed Vi is on average formed by all VSX falling into this interval; Mean speed Ni is on average formed by all NSX falling into this interval; Average net power Pi is on average formed by all PJSX falling into this interval; Above-mentioned mean wind speed Vi, mean speed Ni and average net power Pi, conversion is to wind speed interval intermediate value Vbi, i.e. Nbi=NiVbi/Vi; Pbi=Pi (Vbi/Vi)
3;
In order to distinguish the measurement result of different K X value trace curve, data obtained above are expressed as:
(Vbi，Nbi
(KX)，Pbi
(KX))，i＝1,2,3,……；KX＝0.81,0.9,1.0,1.1,1.21；
(4) the power P bi that in more same wind speed interval, different K X curve obtains
(KX)), obtain data group (Nbi in wind speed interval i
(KX), Pbi
(KX)) middle Pbi
(KX)the KX that the maximum data group of output power is corresponding, presses T=CK (KXN) in this interval
2follow the tracks of and run, obtain best power and export; Nbi
(KX)substitute into T=CK (KXN)
2obtain: Tbi
(KX)=CK (KXNbi
(KX))
2; Thus the rotational speed and torque working point (Nbi obtained in this wind speed interval
(KX), Tbi
(KX))
(5) method of statistics and mathematic curve matching is passed through, the working point (Nbi of all wind speed interval
(KX), Tbi
(KX)) fitting to a quafric curve, this quafric curve is best rotational speed and torque aircraft pursuit course.
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