CN101363405A - Method for enhancing service life of wind power generator paddle - Google Patents
Method for enhancing service life of wind power generator paddle Download PDFInfo
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- CN101363405A CN101363405A CNA2008101985503A CN200810198550A CN101363405A CN 101363405 A CN101363405 A CN 101363405A CN A2008101985503 A CNA2008101985503 A CN A2008101985503A CN 200810198550 A CN200810198550 A CN 200810198550A CN 101363405 A CN101363405 A CN 101363405A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a method used for improving the service life of blades of a wind power generator, belonging to automatic control of the wind power generator, more particularly relating to a method for adjusting the blade pitch angle of the wind power generator. In the process of generation, when wind speed varies between cut-in wind speed and rated wind speed, variable speed control is used and an optimal power curve is traced down to acquire a maximum power, when the wind speed exceeds the rated wind speed, further adjustment is carried out on the blade pitch angle acquired by a traditional control method, and by adjusting each pitch angle, the torque of each blade is balanced, realizing a further aim to improve force state of the blades. The method for improving the service life of blades of a wind power generator solves the defects that the blades continuously suffer accelerated fatigue and advanced damages due to the periodic force change caused by wind speed difference in the process of rotation.
Description
Technical field
The invention belongs to a kind of automatic control of wind-driven generator, the regulating method that relates to its blade propeller pitch angle of wind-driven generator, more specifically, be a kind of in power generation process, when wind speed is above above rated wind speed, the propeller pitch angle that is obtained by traditional variable pitch control method is further regulated, by regulating each propeller pitch angle, thereby the moment of torsion of each blade is averaged out, reach the method for improving the blade stress.
Background technique
Wind-power electricity generation is just promoted in the whole world at present as green energy resource.Domestic newly-built wind field and device fabrication all develop rapidly, and the wind-power electricity generation single-machine capacity further increases.
The operating cost of wind-power electricity generation mainly is to invest depreciation and maintenance cost, therefore reduces maintenance cost in the operation and seems particularly important.
Blade is the primary parts that wind energy absorbs, because it is local preferably that wind field all is arranged on wind resource, wind-force is bigger throughout the year, wind speed is generally between 5m/s-20m/s, the coastal area wind speed may reach 25m/s or higher, and the wind-force frequent fluctuation, so the blade long-time running is under the operating mode of complex stress.
According to the aerodynamics theory, change blade propeller pitch angle (angle facings the wind) and can change the active force of wind for blade, therefore wind-driven generator is all taked blade propeller pitch angle regulation scheme when the above working condition of rated wind speed at present, promptly regulate propeller pitch angle according to wind speed size and target generated energy, change the uptake of blade wind energy, thereby changed generator power output.
For example, Chinese invention patent application 200710041115.5 just discloses a kind of controlling method of wind energy conversion system, when wind speed changes between incision wind speed and rated wind speed, adopts speed Control, follows the trail of the best power curve, to obtain peak output; When wind speed changes between rated wind speed and cut-out wind speed, adopt feather control, by regulating the blade propeller pitch angle, to reduce the acute variation of blade torque, reduce the mechanical stress of parts, and keep rated power constant.
Blade is a glass fiber reinforced plastics product, in the middle of practical application, though wind-driven generator has adopted the propeller pitch angle regulation structure, improved the improper stressing conditions of blade more than rated wind speed, also basic guarantee the stability of generated output, but blade rotate a circle sweep the unified propeller pitch angle of employing on the wind face can cause each blade in rotary course since height of living in different can occur causing stress repetition between each blade to change because of wind speed difference and wheel hub on the imbalance of three blade moments of torsion, STRESS VARIATION especially repeatedly makes blade cause damaging in advance because of accelerating fatigue easily.
Wind-driven generator with 1.5MW is an example, its center height is generally about 70m, the blade rotational speed is between 15-25r/min, length of blade 30-40m, blade sweeps whole that the blade tip height difference will reach 60-80m on the wind face, the level difference of sweeping the wind face will have the wind speed difference of 2-5m/s, therefore blade will bear different stress whole sweeping on the wind face, constantly standing to bring stressed variation of cycle because of sweeping the wind level difference in the rotary course, and this periodicity, thereby the STRESS VARIATION of past renaturation will make the glass fibre reinforced plastics blade accelerate fatigue to be caused damaging in advance.
Summary of the invention
The invention provides a kind of wind power generator oar blade method in working life that improves, when wind-driven generator moves, every blade all is rotated on whole circumference with certain propeller pitch angle, every blade all bears the stress that wind-force brings sweeping on the wind face, the object of the invention is to improve blade and sweeps stressed inhomogeneity method on the wind face in whole rotation, can overcome blade and constantly the problem that periodic stressed variation accelerates fatigue blade and causes damaging in advance will occur because of wind speed difference in standing rotary course.
Purpose of the present invention is realized by following scheme:
A kind of wind power generator oar blade method in working life that improves comprises when wind speed changes between incision wind speed and rated wind speed, adopts speed Control, follows the trail of the best power curve, to obtain the step of peak output; When wind speed changes between rated wind speed and cut-out wind speed, adopt feather control, by regulating the blade propeller pitch angle, the control blade meets with stresses, and keeps the constant step of power generation system rated power; Be characterized in, in the step of feather control, also measure, according to the real time position of each blade, regulate the propeller pitch angle of each blade, so that the moment of torsion of each blade keeps balance by continuous angle of swing to each blade.
Such scheme is in the step of feather control, and each blade propeller pitch angle is adjusted can various methods.Can regulate as foundation according to the vane angle form of the intrinsic CP curve characteristic of blade, also can and comprise the wind speed unbalanced factor that height difference causes according to the residing position of each blade calculates in interior parameter, regulate according to result of calculation, can also adopt other modes to regulate, can reach along with the blade angle of swing changes and changes the blade propeller pitch angle and realize stressed uniform purpose.
Further, invention provides following two kinds specifically to improve blade and sweep stressed inhomogeneity regulating method on the wind face in whole rotation, can recognize its characteristics separately of different adjustment method from these two specific embodiments.
In first concrete mode of execution of the present invention, it takes each blade of test constantly to sweep real-time rotational position on the wind face in whole rotation, and on these rotational position, call the vane angle coefficient according to the intrinsic CP characteristic of blade, propeller pitch angle to original system is revised, thereby make each blade at the whole stress stability of sweeping the wind face, eliminated the influence that cyclic stress changes significantly.
In second concrete mode of execution of the present invention, it takes the real-time moment of torsion of each blade of test constantly to compare, according to result relatively the pitch gain coefficient is adjusted, and sweep real-time rotational position on the wind face in whole rotation in conjunction with each blade, calculate the pitch coefficient, propeller pitch angle to original system is revised, thereby makes each blade at the whole stress stability of sweeping the wind face, has eliminated the influence that cyclic stress changes greatly.
Like this, when blade be operated in 360 the degree sweep on the wind face time, owing to pass through angle of swing, table look-up and call the correction of vane angle coefficient, perhaps the real-time blade moment of torsion of foundation measuring and comparison process adjustment pitch gain coefficient and blade angle of swing calculating correction, revised the pitch angle of each blade, can make the torque of each blade stable, thereby it is the same and problem that the difference of each blade height of living in causes stress repetition to change has also been improved the wheel hub situation simultaneously to have solved each blade propeller pitch angle size in the control of traditional feather.
Further, second embodiment swept on the wind face whole, regulate propeller pitch angle once more on the basis according to real-time angle of rotation of blade and existing propeller pitch angle, each propeller pitch angle ks of optimization, sweep the stress fluctuation that the wind height difference is brought to revise blade, in regulating control, also by constantly to the moment of torsion of each blade detect with relatively, according to relatively result the pitch gain coefficient and the propeller pitch angle of each blade carried out the closed loop adjustment, can further reach and realize best adjustment result.
Description of drawings
Fig. 1 is a kind of specific implementation method of the present invention flow chart that the blade propeller pitch angle is adjusted in feather control;
Fig. 2 is the flow chart that pitch gain coefficient g determines among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the present invention is specifically described in detail:
Mode of execution one: present embodiment is a 1.5MW double-fed type blade.It at diverse location, according to vane angle coefficient (vane angle of the intrinsic CP curve characteristic of the blade) table values (referring to the part subordinate list) of blower fan blade mechanical characteristic, calculates the propeller pitch angle of each blade correspondence according to each blade.
The method of this embodiment is:
1, when wind speed changes, adopts speed Control between incision wind speed and rated wind speed, follow the trail of the best power curve, to obtain the step of peak output.
2, when wind speed changes between rated wind speed and cut-out wind speed, adopt feather control, by regulating the blade propeller pitch angle, the control blade meets with stresses, and keeps the constant step of power generation system rated power.
3, in the step of feather control, also adopt the following step:
1), obtains the propeller pitch angle K of blade by traditional variable pitch control method;
2), utilize encoder to measure the angle of swing C of current each blade;
3), adopt programmable controller, table look-up according to current each blade angle of swing C value and call the corresponding vane angle coefficient u of blower fan blade mechanical characteristic, K multiplies each other with propeller pitch angle, draws to comprise each propeller pitch angle Ku that blade is swept the wind height: i.e. Ku=K*u
4), revised each propeller pitch angle Ku is outputed to each corresponding blade driver by bus or analog amount, and drive each blade through speed reducer.
4, constantly repeat above step.
The part subordinate list:
| Angle (c) | Vane angle coefficient (u) | Angle (c) | Vane angle coefficient (u) |
| 10 | 1.01 | 190 | 1.19 |
| 20 | 1.03 | 200 | 1.17 |
| 30 | 1.03 | 210 | 1.16 |
| 40 | 1.04 | 220 | 1.15 |
| 50 | 1.05 | 230 | 1.14 |
| 60 | 1.06 | 240 | 1.13 |
| 70 | 1.07 | 250 | 1.12 |
| 80 | 1.09 | 260 | 1.11 |
| 90 | 1.10 | 270 | 1.10 |
| 100 | 1.11 | 280 | 1.09 |
| 110 | 1.12 | 290 | 1.08 |
| 120 | 1.13 | 300 | 1.07 |
| 130 | 1.14 | 310 | 1.06 |
| 140 | 1.15 | 320 | 1.05 |
| 150 | 1.16 | 330 | 1.04 |
| 160 | 1.17 | 340 | 1.02 |
| 170 | 1.19 | 350 | 1.01 |
| 180 | 1.20 | 360 | 1.00 |
Mode of execution two: present embodiment is a 1.5MW double-fed type blade.It is set up real-time computation model and calculates each blade propeller pitch angle, and gathers real-time torque value and relatively revise.
The method of this embodiment is:
1, when wind speed changes, adopts speed Control between incision wind speed and rated wind speed, follow the trail of the best power curve, to obtain the step of peak output.
2, when wind speed changes between rated wind speed and cut-out wind speed, adopt feather control, by regulating the blade propeller pitch angle, the control blade meets with stresses, and keeps the constant step of power generation system rated power.
3, in the step of feather control, also adopt the following step:
1), obtains the propeller pitch angle K of blade by traditional variable pitch control method;
2), read the current actual torque of each blade in each blade driver by bus;
3), the moment of torsion with the actual torque of current each blade and blade downward vertically the time carries out the moment of torsion difference relatively, to regulate each pitch gain coefficient g;
4), utilize encoder to measure the angle of swing c of current each blade;
5), calculate the pitch coefficient Hs of each blade: pitch coefficient Hs=[d-cos (c) according to the angle of swing c of the CP curve of blade and current each blade] * g
Wherein, d is the benchmark constant, and this constant serves as that foundation is come value with the CP curve, and value is at 1.0-3.0 usually, and this routine value is 2.0; C is the blade angle of swing; G is the pitch gain coefficient;
6), original each propeller pitch angle K is optimized calculating:
Ks＝K*H?s；
7), the value K s of each propeller pitch angle that computation optimization is obtained outputs to each corresponding blade driver by bus or analog amount, and drives each blade through speed reducer.
4, return step 1.
More specifically, each pitch gain coefficient g can be obtained by following method:
1), measures the actual torque of current each blade;
2), set the permission difference of moment of torsion;
3), the moment of torsion downward vertically the time carries out the moment of torsion difference relatively with the actual torque of current each blade and blade;
4), according to the result of above-mentioned comparison, each pitch gain coefficient g is carried out the increase of a unit quantity or reduces operation.
In addition, pitch gain coefficient g initial value is according to type blade difference and difference, and initial value is between 1.0-3.0, and this routine value is 2.0.
Claims (4)
1, a kind of wind power generator oar blade method in working life that improves comprises when wind speed changes between incision wind speed and rated wind speed, adopts speed Control, follows the trail of the best power curve, to obtain the step of peak output; When wind speed changes between rated wind speed and cut-out wind speed, adopt feather control, by regulating the blade propeller pitch angle, the control blade meets with stresses, and keeps the constant step of power generation system rated power; It is characterized in that, in the step of feather control, also measure, according to the real time position of each blade, regulate the propeller pitch angle of each blade, so that the moment of torsion of each blade keeps balance by continuous angle of swing to each blade.
2, according to the method in raising wind power generator oar blade working life of claim 1, it is characterized in that in the step of feather control, each blade propeller pitch angle is regulated according to following method:
1), obtains the propeller pitch angle K of blade by traditional variable pitch control method;
2), utilize encoder to measure the angle of swing C of current each blade;
3), adopt programmable controller, table look-up according to current each blade angle of swing C value and call the corresponding vane angle coefficient u of blower fan blade mechanical characteristic, K multiplies each other with propeller pitch angle, draws to comprise each propeller pitch angle Ku that blade is swept the wind height: i.e. Ku=K*u
4), revised each propeller pitch angle Ku is outputed to each corresponding blade driver by bus or analog amount, and drive each blade through speed reducer.
3, according to the method in raising wind power generator oar blade working life of claim 1, it is characterized in that in the step of feather control, each blade propeller pitch angle is regulated according to following method:
1), obtains the propeller pitch angle K of blade by traditional variable pitch control method;
2), read the current actual torque of each blade in each blade driver by bus;
3), the moment of torsion with the actual torque of current each blade and blade downward vertically the time carries out the moment of torsion difference relatively, to regulate each pitch gain coefficient g;
4), utilize encoder to measure the angle of swing c of current each blade;
5), calculate the pitch coefficient Hs of each blade: pitch coefficient Hs=[d-cos (c) according to the angle of swing c of the CP curve of blade and current each blade] * g
6), original each propeller pitch angle K is optimized calculating: Ks=K*Hs;
7), the value Ks of each propeller pitch angle that computation optimization is obtained outputs to each corresponding blade driver by bus or analog amount, and drives each blade through speed reducer.
4, according to the method in raising wind power generator oar blade working life of claim 3, it is characterized in that each pitch gain coefficient g can be obtained by following method:
1), measures the actual torque of current each blade;
2), set the permission difference of moment of torsion;
3), the moment of torsion downward vertically the time carries out the moment of torsion difference relatively with the actual torque of current each blade and blade;
4), according to the result of above-mentioned comparison, each is adjusted gain g carries out the increase of a unit quantity or reduce operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101985503A CN101363405B (en) | 2008-09-09 | 2008-09-09 | Method for enhancing service life of wind power generator paddle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101985503A CN101363405B (en) | 2008-09-09 | 2008-09-09 | Method for enhancing service life of wind power generator paddle |
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| CN101363405A true CN101363405A (en) | 2009-02-11 |
| CN101363405B CN101363405B (en) | 2012-01-04 |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2479415A (en) * | 2010-04-09 | 2011-10-12 | Vestas Wind Sys As | Wind Turbine Independent Blade Control Outside The Rated Output |
| CN103225588A (en) * | 2012-01-31 | 2013-07-31 | 北京能高自动化技术股份有限公司 | Wind power generation power curve optimization method based on pattern recognition technology |
| CN103375332A (en) * | 2012-04-17 | 2013-10-30 | 北京能高自动化技术股份有限公司 | Dynamic optimization method for optimal resisting moment in variable-speed variable-pitch wind generating unit |
| CN105569920A (en) * | 2016-03-08 | 2016-05-11 | 太原重工股份有限公司 | Control method and control system of wind driven generator |
| CN107070360A (en) * | 2017-05-02 | 2017-08-18 | 湖南拓天节能控制技术股份有限公司 | Wind-power electricity generation exchange becomes oar servo-driver output torque smooth control method |
| CN107810323A (en) * | 2015-06-30 | 2018-03-16 | 维斯塔斯风力系统集团公司 | The method and system arranged for generating wind turbine control |
| CN107810324A (en) * | 2015-06-30 | 2018-03-16 | 维斯塔斯风力系统集团公司 | For generating the method and system of wind turbine control-time table |
| CN108382569A (en) * | 2018-01-24 | 2018-08-10 | 歌尔股份有限公司 | A kind of unmanned plane blade life detection method, system and storage medium |
| US10240581B2 (en) | 2017-02-08 | 2019-03-26 | General Electric Company | System and method for controlling pitch angle of a wind turbine rotor blade |
| CN110520619A (en) * | 2016-12-08 | 2019-11-29 | 赛创尼克株式会社 | Energy conversion device, energy conversion system and its method of operation comprising it |
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| US10907611B2 (en) | 2015-06-30 | 2021-02-02 | Vestas Wind Systems A/S | Methods and systems for generating wind turbine control schedules |
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2008
- 2008-09-09 CN CN2008101985503A patent/CN101363405B/en not_active Expired - Fee Related
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| GB2479415A (en) * | 2010-04-09 | 2011-10-12 | Vestas Wind Sys As | Wind Turbine Independent Blade Control Outside The Rated Output |
| CN103225588B (en) * | 2012-01-31 | 2015-05-13 | 北京能高自动化技术股份有限公司 | Wind power generation power curve optimization method based on pattern recognition technology |
| CN103225588A (en) * | 2012-01-31 | 2013-07-31 | 北京能高自动化技术股份有限公司 | Wind power generation power curve optimization method based on pattern recognition technology |
| CN103375332A (en) * | 2012-04-17 | 2013-10-30 | 北京能高自动化技术股份有限公司 | Dynamic optimization method for optimal resisting moment in variable-speed variable-pitch wind generating unit |
| CN103375332B (en) * | 2012-04-17 | 2016-06-08 | 北京能高自动化技术股份有限公司 | Speed-changing oar-changing wind power generating set optimum moment of resistance dynamic optimization method |
| CN107810324B (en) * | 2015-06-30 | 2019-12-24 | 维斯塔斯风力系统集团公司 | Method and system for generating a wind turbine control schedule |
| US10907611B2 (en) | 2015-06-30 | 2021-02-02 | Vestas Wind Systems A/S | Methods and systems for generating wind turbine control schedules |
| CN107810323A (en) * | 2015-06-30 | 2018-03-16 | 维斯塔斯风力系统集团公司 | The method and system arranged for generating wind turbine control |
| CN107810324A (en) * | 2015-06-30 | 2018-03-16 | 维斯塔斯风力系统集团公司 | For generating the method and system of wind turbine control-time table |
| US11428208B2 (en) | 2015-06-30 | 2022-08-30 | Vestas Wind Systems A/S | Methods and systems for generating wind turbine control schedules |
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| US10928816B2 (en) | 2015-06-30 | 2021-02-23 | Vestas Wind Systems A/S | Methods and systems for generating wind turbine control schedules |
| CN107810323B (en) * | 2015-06-30 | 2020-04-07 | 维斯塔斯风力系统集团公司 | Method and system for generating a wind turbine control arrangement |
| CN105569920A (en) * | 2016-03-08 | 2016-05-11 | 太原重工股份有限公司 | Control method and control system of wind driven generator |
| CN105569920B (en) * | 2016-03-08 | 2018-09-04 | 太原重工股份有限公司 | A kind of control method and control system of wind-driven generator |
| CN110520619A (en) * | 2016-12-08 | 2019-11-29 | 赛创尼克株式会社 | Energy conversion device, energy conversion system and its method of operation comprising it |
| CN110520619B (en) * | 2016-12-08 | 2022-02-22 | 赛创尼克株式会社 | Energy conversion device, energy conversion system including the same, and method of operating the same |
| US10240581B2 (en) | 2017-02-08 | 2019-03-26 | General Electric Company | System and method for controlling pitch angle of a wind turbine rotor blade |
| CN107070360A (en) * | 2017-05-02 | 2017-08-18 | 湖南拓天节能控制技术股份有限公司 | Wind-power electricity generation exchange becomes oar servo-driver output torque smooth control method |
| CN107070360B (en) * | 2017-05-02 | 2019-08-13 | 湖南拓天节能控制技术股份有限公司 | Wind-power electricity generation exchanges variable pitch servo-driver output torque smooth control method |
| CN108382569B (en) * | 2018-01-24 | 2020-08-18 | 歌尔股份有限公司 | Unmanned aerial vehicle blade service life detection method and system and storage medium |
| CN108382569A (en) * | 2018-01-24 | 2018-08-10 | 歌尔股份有限公司 | A kind of unmanned plane blade life detection method, system and storage medium |
| CN116526511A (en) * | 2023-05-19 | 2023-08-01 | 东北电力大学 | Method for controlling load frequency of multi-source cooperative participation system |
| CN116526511B (en) * | 2023-05-19 | 2024-03-08 | 东北电力大学 | Method for controlling load frequency of multi-source cooperative participation system |
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| CN101363405B (en) | 2012-01-04 |
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Owner name: SHANTOU ZHONGYEDA ELECTRIC APPLIANCE CO., LTD. Free format text: FORMER OWNER: ZHONGYEDA ELECTRIC, INC. Effective date: 20110928 |
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