CN103410663B - The optimum propeller pitch angle discrimination method of a kind of fan blade - Google Patents
The optimum propeller pitch angle discrimination method of a kind of fan blade Download PDFInfo
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- CN103410663B CN103410663B CN201310349355.7A CN201310349355A CN103410663B CN 103410663 B CN103410663 B CN 103410663B CN 201310349355 A CN201310349355 A CN 201310349355A CN 103410663 B CN103410663 B CN 103410663B
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Abstract
The invention discloses the optimum propeller pitch angle discrimination method of a kind of fan blade, comprise the following steps: A. calculates blower fan Cp-lamda curve, respectively reduces 1%, determine propeller pitch angle interval 1 [P1, P2] around maximum about Cp; B. blower fan steady state power curve is calculated; C. determine maximum annual electricity generating capacity in conjunction with wind field wind speed, around about maximum annual electricity generating capacity, respectively reduce 1%, determine propeller pitch angle interval 2 [P3, P4]; D. get the common factor [P5, P6] of [P1, P2] and [P3, P4], in this is interval, calculates blower fan dynamic power curve, n propeller pitch angle corresponding when determining that generated output is maximum under the individual different mean wind velocity of the n of mean wind velocity between 3m/s-6m/s; E. the actual test of wind field is carried out to n propeller pitch angle; F. optimum value is selected according to test result.In low wind speed, ultralow wind speed wind field, find optimum propeller pitch angle according to method of the present invention, annual electricity generating capacity about 2% can be improved.
Description
Technical field
The present invention relates to technical field of wind power, particularly relate to the optimum propeller pitch angle discrimination method of a kind of fan blade.
Background technique
Wind-powered electricity generation is important clean energy resource, its exploitation come into one's own day by day, current feather technology widely uses in Large-scale Wind Turbines, and suitable change oar control strategy can make blade of wind-driven generator catch more wind energy, thus on generated output, obtain considerable benefit.
The running state of speed-variable frequency-constant wind-driven generator group can be divided into four kinds of different stages according to wind regime difference: be constant speed grid-connected (incision) stage, maximum Cp stage, rated speed stage and rated power stage respectively.When arriving incision wind speed, generator is cut with minimum speed, under now wind-driven generator operates in very large tip-speed ratio, at this stage generator minimally rotating speed; Along with the raising of wind speed, tip-speed ratio reduces gradually, and when reaching best tip-speed ratio, wind-driven generator enters three phases, i.e. the maximum Cp stage, at this stage motor by making wind-driven generator operate in the state of best Cp all the time to the adjustment of rotational speed and torque; When motor reaches rated speed, wind-driven generator runs and enters second stage, under rated speed, wind-driven generator tip-speed ratio reduces gradually along with the raising of wind speed, and continuous off-target tip-speed ratio, in this stage, wind-driven generator runs Cp obviously to be reduced, but because wind speed improves constantly, wind-power electricity generation acc power is close to rated condition gradually; When reaching rated condition, wind-driven generator keeps Rated motor rotating speed, torque, and controls to make motor maintain invariable power state by becoming oar.Different change oar strategies makes fan operation on different Cp-lamda curves, and under normal circumstances, front three phases blade pitch angle is zero degree.
At present, when fan operation is below rated wind speed, blower fan propeller pitch angle is typically provided to a fixed value, and every Optimized Measures all concentrates on the right side of optimum Cp section and rated speed section.Because the wind energy turbine set major part of Middle And Eastern China is low wind speed wind field, some or ultralow wind speed wind field, the wind speed interval major part of fan operation is at 3m/s-6m/s, quite a few time inner blower operates in incision stage and maximum Cp section left-half, therefore, need to consider emphatically to optimize the fan efficiency problem in this wind speed section.
Summary of the invention
The object of this invention is to provide the optimum propeller pitch angle discrimination method of a kind of fan blade, make speed-variable frequency-constant wind-driven generator have optimum propeller pitch angle in incision stage and optimum Cp section left-half.
For achieving the above object, the present invention adopts following technological scheme:
The optimum propeller pitch angle discrimination method of a kind of fan blade, comprises the following steps: A. calculates the blower fan power factor under different propeller pitch angle-tip-speed ratio Cp-lamda curve, respectively reduces 1%, determine optional interval 1 [P1, the P2] of propeller pitch angle around maximum about Cp; B. the blower fan steady state power curve under different propeller pitch angle is calculated; C. according to described blower fan steady state power curve, adopt annual mean wind speed standard Weibull distribution, suppose that the availability of blower fan is 100%, calculate the annual electricity generating capacity of blower fan under different propeller pitch angle, determine maximum annual electricity generating capacity, reduce 1% with each about maximum annual electricity generating capacity, obtain optional interval 2 [P3, the P4] of propeller pitch angle; D. described interval 1 [P1 is got, P2] and interval 2 [P3, P4] common factor [P5, P6], calculate at [P5, P6] interval in blower fan dynamic power curve under different propeller pitch angle, n propeller pitch angle corresponding when determining that generated output is maximum under the n of mean wind velocity between 3m/s-6m/s different mean wind velocity; E. in same wind field, selected n group test blower fan, corresponding n the propeller pitch angle being adjusted to gained, carries out the test of several months by a definite date respectively; F. the Data Comparison blower fan obtained according to fan monitoring and data acquistion system before testing after generated output under different wind speed, the ratio of contrast test blower fan generated energy shared statistics electricity emphatically, selects optimum propeller pitch angle simultaneously.
Further, in described step D, n=3, and 3 different mean wind velocitys are respectively 3.5m/s, 4.5m/s and 5.5m/s.
Further, test described in step e blower fan often group 2 Fans are set, and carry out the test of 3-6 month by a definite date.
Further, described optimum propeller pitch angle is speed-variable frequency-constant wind-driven generator at the optimum propeller pitch angle of incision stage and optimum Cp section left-half.
Owing to adopting technique scheme, the present invention at least has the following advantages:
The optimum propeller pitch angle discrimination method of fan blade of the present invention, according to the concrete wind regime of different wind field, is arranged to different value by blower fan propeller pitch angle; Optimized Measures concentrates on constant speed and on the left of the network segment and optimum Cp section, is conducive to optimizing the low wind speed wind field of China Middle Eastern, ultralow wind speed wind field improves fan efficiency.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is the power factor-tip-speed ratio plotted curve of blower fan under different propeller pitch angle.
Fig. 2 is the generated output plotted curve of blower fan under different propeller pitch angle.
Fig. 3 is that propeller pitch angle optimizes rear fan generated energy proportion with wind speed variation diagram.
Embodiment
The optimum propeller pitch angle discrimination method of a kind of fan blade of the present invention, comprises the following steps:
A. calculate the blower fan power factor under different propeller pitch angle-tip-speed ratio Cp-lamda curve, respectively reduce 1% around maximum about Cp, determine optional interval 1 [P1, the P2] of propeller pitch angle; B. the blower fan steady state power curve under different propeller pitch angle is calculated; C. according to described blower fan steady state power curve, adopt annual mean wind speed standard Weibull distribution, suppose that the availability of blower fan is 100%, calculate the annual electricity generating capacity of blower fan under different propeller pitch angle, determine maximum annual electricity generating capacity, reduce 1% with each about maximum annual electricity generating capacity, obtain optional interval 2 [P3, the P4] of propeller pitch angle; D. described interval 1 [P1 is got, P2] and interval 2 [P3, P4] common factor [P5, P6], calculate at [P5, P6] interval in blower fan dynamic power curve under different propeller pitch angle, n propeller pitch angle corresponding when determining that generated output is maximum under the n of mean wind velocity between 3m/s-6m/s different mean wind velocity; E. in same wind field, selected n group test blower fan, corresponding n the propeller pitch angle being adjusted to gained, carries out the test of several months by a definite date respectively; F. the Data Comparison blower fan obtained according to fan monitoring and data acquistion system before testing after generated output under different wind speed, the ratio of contrast test blower fan generated energy shared statistics electricity, selects optimum propeller pitch angle emphatically.
Wherein, in step D, can n=3 be set, now desirable 3 different mean wind velocity 3.5m/s, 4.5m/s and 5.5m/s, find out generated output under 3 wind speed maximum time corresponding 3 propeller pitch angles.Accordingly, in step e, selected 3 groups of test blower fans, often group can arrange 2 Fans, carry out the test of the 3-6 month by a definite date.
According to aforesaid operations mode, in low wind speed, ultralow wind speed wind field, find the optimum propeller pitch angle of speed-variable frequency-constant wind-driven generator in incision stage and optimum Cp section left-half, after being adjusted to the right place by propeller pitch angle, wind field annual electricity generating capacity about 2% can be improved.
Application the method has carried out concrete enforcement at Tianjin wind field, implementation process is mainly divided into three phases, first stage is simulation stage, first power factor-tip-speed ratio (Cp-lamda) curve of wind field blower fan under different propeller pitch angle is as shown in Figure 1 calculated, propeller pitch angle interval 1 [-1.7 °, 0.9 °] corresponding when determining respectively to reduce 1% around maximum about Cp.Calculate blower fan steady state power curve as shown in Figure 2 again, determine that the annual mean wind speed of wind field is about 6.6m/s, the actual conditions of application steady state power curve and wind field calculates blower fan annual electricity generating capacity, around propeller pitch angle interval 2 [-2.5 °, 0.6 °] reduced corresponding to 1% each about maximum annual electricity generating capacity.Then above-mentioned interval 1 [-1.7 ° are got, 0.9 °] and the common factor [-1.7 °, 0.6 °] of interval 2 [-2.5 °, 0.6 °], the blower fan dynamic power curve under different propeller pitch angle is calculated, propeller pitch angle corresponding when determining that generated output is maximum under low wind speed in this intersection range.Propeller pitch angle-1.5 ° corresponding under selected 3.5m/s, 4.5m/s and 5.5m/s wind speed ,-0.8 ° ,-0.3 °.
Second stage is test phase, selected above-mentioned three propeller pitch angles, and selected 6 test blower fans, every two Fans debug an established angle, and test period is in April ,-2013 in October, 2012.
Be finally data analysis phase, contrast blower fan before testing after the ratio of whole audience blower fan generated energy shared by generated output curve under different wind speed and generated energy, in order to evaluate propeller pitch angle effect of optimization.Wherein, when carrying out generated output curve comparison, needing to weed out invalid generating data (comprising data etc. obviously bigger than normal, less than normal), air density should be calibrated with temperature simultaneously, ensure that the benchmark before and after generated output curve comparison is consistent.When contrasting generated energy proportion and whether improving, select blower fan availability to be greater than and contrast in section for 99% working time, weed out the data of generated energy exception simultaneously.
As shown in Figure 3, Data Comparison display is worked as blower fan propeller pitch angle and is adjusted to-0.8 °, and the generated energy proportion of test blower fan obtains effective raising, and the average amplification of wind field generated energy reaches 2.9%.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (4)
1. the optimum propeller pitch angle discrimination method of fan blade, is characterized in that, comprise the following steps:
A. calculate the blower fan power factor under different propeller pitch angle-tip-speed ratio Cp-lamda curve, respectively reduce 1% around maximum about Cp, determine optional interval 1 [P1, the P2] of propeller pitch angle;
B. the blower fan steady state power curve under different propeller pitch angle is calculated;
C. according to described blower fan steady state power curve, adopt annual mean wind speed standard Weibull distribution, suppose that the availability of blower fan is 100%, calculate the annual electricity generating capacity of blower fan under different propeller pitch angle, determine maximum annual electricity generating capacity, reduce 1% with each about maximum annual electricity generating capacity, obtain optional interval 2 [P3, the P4] of propeller pitch angle;
D. described interval 1 [P1 is got, P2] and interval 2 [P3, P4] common factor [P5, P6], calculate at [P5, P6] interval in blower fan dynamic power curve under different propeller pitch angle, n propeller pitch angle corresponding when determining that generated output is maximum under the n of mean wind velocity between 3m/s-6m/s different mean wind velocity;
E. in same wind field, selected n group test blower fan, corresponding n the propeller pitch angle being adjusted to gained, carries out the test of several months by a definite date respectively;
F. the Data Comparison blower fan obtained according to fan monitoring and data acquistion system before testing after generated output under different wind speed, contrast emphatically the ratio of the test blower fan generated energy shared statistics electricity under different propeller pitch angle simultaneously, select optimum propeller pitch angle.
2. the optimum propeller pitch angle discrimination method of fan blade according to claim 1, is characterized in that, in described step D, and n=3, and 3 different mean wind velocitys are respectively 3.5m/s, 4.5m/s and 5.5m/s.
3. the optimum propeller pitch angle discrimination method of fan blade according to claim 1, is characterized in that, test described in step e blower fan often group 2 Fans are set, and carry out the test of 3-6 month by a definite date.
4. the optimum propeller pitch angle discrimination method of fan blade according to any one of claim 1-3, is characterized in that, described optimum propeller pitch angle is the optimum propeller pitch angle of speed-variable frequency-constant wind-driven generator when operating in incision stage and optimum Cp stage left-half.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104863793B (en) * | 2015-06-10 | 2017-11-14 | 东南大学 | A kind of control method that wind-driven generator pitching action command is triggered according to average value |
| CN108223271A (en) * | 2017-12-29 | 2018-06-29 | 华润电力风能（汕头潮南）有限公司 | A kind of method of adjustment and device of fan blade setting angle |
| CN110873022B (en) * | 2018-08-31 | 2021-01-26 | 北京金风科创风电设备有限公司 | Method and device for self-optimizing blade pitch angle of wind generating set |
| CN111058994A (en) * | 2019-11-19 | 2020-04-24 | 大唐新疆清洁能源有限公司 | Variable pitch control system and method of variable pitch generator |
| CN111927708A (en) * | 2020-08-14 | 2020-11-13 | 国电联合动力技术有限公司 | Pitch angle self-optimizing control method and device |
| CN113279904B (en) * | 2021-05-24 | 2022-06-21 | 许昌许继风电科技有限公司 | Pitch angle optimizing method and device for maximum power tracking of wind turbine generator |
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| US7002259B2 (en) * | 2001-08-22 | 2006-02-21 | Clipper Windpower Technology, Inc. | Method of controlling electrical rotating machines connected to a common shaft |
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