CN101498281B - Direct drive type hydraulic variable pitch controlling mechanism for wind power generator - Google Patents
Direct drive type hydraulic variable pitch controlling mechanism for wind power generator Download PDFInfo
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- CN101498281B CN101498281B CN2009100714231A CN200910071423A CN101498281B CN 101498281 B CN101498281 B CN 101498281B CN 2009100714231 A CN2009100714231 A CN 2009100714231A CN 200910071423 A CN200910071423 A CN 200910071423A CN 101498281 B CN101498281 B CN 101498281B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention relates to a direct driving type hydraulic propeller-pitch variation control mechanism of a wind powered generator, which belongs to the technique field of wind power generating equipment. The invention provides the direct driving type hydraulic propeller-pitch variation control mechanism which comprises a closed type oil tank, an alternating current servo motor, a two-way constant rate pump, an oil supplementing valve, a hydraulic lock and a propeller-pitch variation hydraulic cylinder aiming at the problem of the complex hydraulic loop and the low reliability and the defect of no redundant control of a hydraulic propeller-pitch variation control mechanism of a prior wind powered generator. In addition, a power output shaft of the alternating current servo motor is connected with a power input shaft of the two-way constant rate pump which is connected with the propeller-pitch variation hydraulic cylinder through the hydraulic lock, the closed type loop is formed by two oil ways positioned between the two-way constant rate pump and the propeller-pitch variation hydraulic cylinder, two oil inlet and outlet openings of the oil supplementing valve are respectively connected with the two oil ways positioned between the two-way constant rate pump and the propeller-pitch variation hydraulic cylinder, and a third oil inlet and outlet opening of the oil supplementing valve is connected with an oil inlet and outlet opening of the closed type oil tank. The invention has the advantages of simple structure, reliable control, light weight, small floor area, and the like.
Description
Technical field
The present invention relates to the technical field of wind power plant, be specifically related to the wind-driven generator hydraulic variable pitch controlling mechanism.
Background technique
Large-scale wind driven generator has two kinds of fixed pitch and feathers.The fixed pitch blower fan is exactly that the angle that facings the wind of blade is fixed, and wind-force can cause rotating speed too high during greater than certain value, and unit can't proper functioning; The blade of the feather blower fan angle can regulate of facining the wind, near rated wind speed, regulate propeller pitch angle at any time according to change of wind velocity, the mechanical energy that control absorbs, guarantee on the one hand to obtain maximum energy (corresponding), reduce the impact of wind-force simultaneously wind energy conversion system with rated power.And network process in, feather control also can realize not having fast to impact being incorporated into the power networks.Variable-pitch control system matches with the variable speed constant frequency technology, has finally improved the generating efficiency and the quality of power supply of whole wind force generating system.In order to make impeller can satisfy the state that can bear of motor, need under different wind friction velocities, set its suitable change vane angle degree, to satisfy the residing working state of generator at optimum state to the driving power of motor.By the adjusting of feather, can effectively improve the aeroperformance of wind power generating set.Especially, when running into strong winds such as entablement wind when wind-driven generator, unit can be out of service immediately, so that power interruptions, and the blade of this moment need be controlled on the position that parallels with wind direction, guarantees that blade no longer rotates, and this moment, the blade displacement played the effect of aerodynamic brake.
Fig. 1 is the schematic representation of control system for variable pitch of wind-driven generator, control system transmission given signal of propeller pitch angle and level demand signal are to the feather controller, the feather controller is given the displacement control mechanism by the existing propeller pitch angle of setting value and blade and performance number are compared and calculate required drive signal, the displacement control mechanism changes the blade propeller pitch angle, to satisfy the residing working state of generator at optimum state.
The typical hydraulic pressure displacement control mechanism structural representation of Fig. 2 for using on the existing wind-driven generator.This hydraulic variable pitch controlling mechanism belongs to electrohydraulic servo system.The structural analysis of the typical hydraulic pressure displacement control mechanism that uses from existing wind-driven generator we as can be seen, existing variable pitch controlling mechanism oil hydraulic circuit complexity is equipped with three solenoid directional control valves in the loop and an electro-hydraulic proportion reversing valve is controlled.Because pitch-changing mechanism needs to adjust continuously pitch angle, the electromagnet of three solenoid directional control valves is charged always, the electromagnetism iron rule of electro-hydraulic proportion reversing valve is a frequent movement, if wherein any one electromagnet breaks down, then this variable pitch controlling mechanism just can't proper functioning, in addition, the clamping stagnation of the valve core of the spool valve of proportional reversing valve and solenoid directional control valve also is one of hydraulic variable pitch controlling mechanism cause faults.Existing thus hydraulic pressure displacement control mechanism reliability is not high.On the other hand, hydraulic pressure displacement control mechanism does not have Redundant Control, in case this hydraulic pressure displacement control mechanism breaks down, will cause stopping accident.
Summary of the invention
The present invention is directed to the complicated and not high deficiency of reliability of existing wind-driven generator hydraulic variable pitch controlling mechanism oil hydraulic circuit, and the defective that does not have Redundant Control, and a kind of direct drive type hydraulic variable pitch controlling mechanism that is used for wind-driven generator has been proposed.
Direct drive type hydraulic variable pitch controlling mechanism of the present invention comprises enclosed oil tank, AC servo motor, two-way metering pump, Fill valve, bidirectional hydraulic lock and feather oil hydraulic cylinder; The AC servo motor pto is connected with two-way metering pump power input shaft, two-way metering pump is connected with the feather oil hydraulic cylinder by bidirectional hydraulic lock, two oil circuits between two-way metering pump and the feather oil hydraulic cylinder are formed closed circuit, two oil inlet and outlets of Fill valve are connected on two oil circuits between two-way metering pump and the feather oil hydraulic cylinder, and the 3rd oil inlet and outlet of Fill valve connects the oil inlet and outlet of enclosed oil tank; Enclosed oil tank, AC servo motor, two-way metering pump, Fill valve and bidirectional hydraulic lock are formed a cover electro-hydraulic servo power source, and described feather oil hydraulic cylinder connects two cover electro-hydraulic servo power sources at least; Direct drive type hydraulic variable pitch controlling mechanism also comprises often drives 2/2-way solenoid valve, normally closed 2/2-way solenoid valve and hydraulic accumulator; The rod chamber of feather oil hydraulic cylinder is communicated with the enclosed oil tank by often driving the 2/2-way solenoid valve; The rodless cavity of feather oil hydraulic cylinder is communicated with hydraulic accumulator by normally closed 2/2-way solenoid valve.
Direct drive type hydraulic variable pitch controlling mechanism of the present invention adopts closed circuit, the invention has the beneficial effects as follows: advantages such as with respect to traditional wind-driven generator variable propeller pitch control mechanism, that the present invention has is simple in structure, control is reliable, in light weight, floor space is little.Concrete advantage of the present invention mainly shows the following aspects: direct drive type hydraulic becomes the pulp grinder structure by the turning to of control AC servo motor, rotating speed with control direction, speed and the displacement of feather oil hydraulic cylinder running time, removed the electro-hydraulic proportional valve of fluid granularity sensitivity and the solenoid directional control valve that breaks down easily, simplify oil hydraulic circuit, reduced the probability that breaks down.Direct drive type hydraulic becomes pulp grinder structure hydraulic drive circuit can adopt redundant configuration, control system can detect the operating mode that direct drive type hydraulic becomes the pulp grinder structure automatically, when the oil hydraulic circuit of a cover direct drive type hydraulic blade pitch device breaks down decompression, control system automatically switches to second cover and becomes the oar oil hydraulic circuit, and the reliability that makes hydraulic pressure become the pulp grinder structure improves greatly.When emergency case needs quick shutdown, can control two cover oil hydraulic circuits and work simultaneously, accelerate the speed of feather oil hydraulic cylinder, blade is moved on the position that parallels with wind direction, guarantee that blade no longer rotates.
Description of drawings
Fig. 1 is the schematic representation of control system for variable pitch of wind-driven generator; The typical hydraulic pressure displacement control mechanism structural representation of Fig. 2 for using on the existing wind-driven generator; Fig. 3 is the structural representation of direct drive type hydraulic variable pitch controlling mechanism of the present invention; The structural representation of the direct drive type hydraulic variable pitch controlling mechanism when Fig. 4 is a consideration dead electricity safety in the embodiment two.
Embodiment
Embodiment one: in conjunction with Fig. 3 present embodiment is described, the direct drive type hydraulic variable pitch controlling mechanism in the present embodiment is made up of enclosed oil tank 20, AC servo motor 21, coupling 22, two-way metering pump 23, Fill valve 24, bidirectional hydraulic lock 25 and feather oil hydraulic cylinder 26; AC servo motor 21 ptos are connected with two-way metering pump 23 power input shafts by coupling 22, AC servo motor 21 receives behind the voltage signal of feather controllers the back clockwise or be rotated counterclockwise, driving two-way metering pump 23 rotates, to displacement oil hydraulic cylinder 26 pressure oil output, the motion of promotion hydraulic cylinder piston rod, and then regulate the blade propeller pitch angle, to satisfy the residing working state of generator at optimum state; When feedback signal when given feather signal equates, the feather controller export to AC servo motor 21 voltage be zero, AC servo motor 21 shuts down, and feather oil hydraulic cylinder 26 piston rods are stabilized on the predeterminated position; Two-way metering pump 23 is connected with feather oil hydraulic cylinder 26 by bidirectional hydraulic lock 25, two oil circuits between two-way metering pump 23 and the feather oil hydraulic cylinder 26 are formed closed circuit, the function of bidirectional hydraulic lock 25 is when feather oil hydraulic cylinder 26 reaches designated displacement, AC servo motor 21 shuts down, and bidirectional hydraulic lock 25 can make the piston rod of displacement oil hydraulic cylinder 26 be stabilized on the predeterminated position.At this moment, AC servo motor 21 shuts down, and waits for next feather order, therefore can receive obvious energy-saving effect.Two oil inlet and outlets of Fill valve 24 are connected on two oil circuits between two-way metering pump 23 and the feather oil hydraulic cylinder 26, and the 3rd oil inlet and outlet of Fill valve 24 connects the oil inlet and outlet of enclosed oil tank 20.The effect of Fill valve 24 is to replenish fluid when fluid is not enough in the closed circuit and fluid unnecessary in the closed circuit is flow back to enclosed oil tank 20 from enclosed oil tank 20 in closed circuit.Enclosed oil tank 20, AC servo motor 21, coupling 22, two-way metering pump 23, Fill valve 24 and bidirectional hydraulic lock 25 are formed a cover electro-hydraulic servo power source.
Embodiment two: in conjunction with Fig. 4 present embodiment is described, present embodiment and embodiment one difference are to have increased often drives 2/2-way solenoid valve 28, normally closed 2/2-way solenoid valve 29 and hydraulic accumulator 31; The rod chamber of feather oil hydraulic cylinder 26 is communicated with enclosed oil tank 20 by often driving 2/2-way solenoid valve 28; The rodless cavity of feather oil hydraulic cylinder 26 is communicated with hydraulic accumulator 31 by normally closed 2/2-way solenoid valve 29; Often drive 2/2-way solenoid valve 28 and normally closed 2/2-way solenoid valve 29 is all switched on when feather is regulated, be kept closed, this moment direct drive type hydraulic variable pitch controlling mechanism other part working methods with specific embodiments one.When the direct drive type hydraulic variable pitch controlling mechanism dead electricity, promptly meet typhoon emergency cut-off or two-way variable pitch controlling mechanism when all breaking down, often open 2/2-way solenoid valve 28 and normally closed 2/2-way solenoid valve 29 equal dead electricity, hydraulic oil enters the rodless cavity of feather oil hydraulic cylinder 26 by normally closed 2/2-way solenoid valve 29 from hydraulic accumulator 31, the hydraulic oil of the rod chamber of feather oil hydraulic cylinder 26 is discharged into enclosed oil tank 20 by often driving 2/2-way solenoid valve 28, and the blade displacement is to+88 ° of mechanical end points.Other composition is identical with embodiment one with Placement.
Embodiment three: present embodiment is described in conjunction with Fig. 4, present embodiment and embodiment one or two differences are to have increased hand stop valve 27, and three hydraulic fluid ports of hand stop valve 27 are connected with the oil inlet and outlet of enclosed oil tank 20, the rod chamber of feather oil hydraulic cylinder 26 and the oil inlet and outlet of rodless cavity respectively.Hand stop valve 27 cuts out when flat, is locking between two chambeies of feather oil hydraulic cylinder 26, the enclosed oil tank 20.When needs are safeguarded direct drive type hydraulic variable pitch mechanism, can 26 liang of chambeies of feather oil hydraulic cylinder be communicated with enclosed oil tank 20 by opening hand stop valve 27, lay down the pressure in the feather oil hydraulic cylinder 26, just can safeguard feather oil hydraulic cylinder 26.Other composition is identical with embodiment one or two with Placement.
Embodiment four: present embodiment is described in conjunction with Fig. 3 or Fig. 4, present embodiment and embodiment three differences are that Fill valve 24 is made up of two Pilot operated check valves, and two Pilot operated check valves are respectively first Pilot operated check valve and second Pilot operated check valve; Hydraulic fluid port of first Pilot operated check valve and control port are connected with two oil circuits between the feather oil hydraulic cylinder 26 with two-way metering pump 23 respectively, hydraulic fluid port of second Pilot operated check valve and first Pilot operated check valve the oil circuit that control port was connected link to each other, the control port of second Pilot operated check valve and first Pilot operated check valve an oil circuit that hydraulic fluid port was connected link to each other, another hydraulic fluid port of another hydraulic fluid port of first Pilot operated check valve and second Pilot operated check valve is connected with the oil inlet and outlet of enclosed oil tank 20 simultaneously, hydraulic fluid port of second Pilot operated check valve and control port and first Pilot operated check valve a hydraulic fluid port identical with the control port Placement, it is opposite to connect oil circuit, and another hydraulic fluid port of another hydraulic fluid port of first Pilot operated check valve and second Pilot operated check valve is connected with the oil inlet and outlet of enclosed oil tank 20 simultaneously.The Fill valve 24 that is made of two Pilot operated check valves is connected in the closed circuit, the hydraulic fluid port that can guarantee two-way metering pump 23 reliably communicates with hydraulic oil in the enclosed oil tank 20, the leakage of compensate for bidirectional metering pump 23 and feather oil hydraulic cylinder 26, pressure in the assurance oil pipe is pressed greater than air separation, prevents that cavitation and air from infiltrating.Bidirectional hydraulic lock 25 is made up of two Pilot operated check valves, and two Pilot operated check valves are respectively the 3rd Pilot operated check valve and the 4th Pilot operated check valve; A hydraulic fluid port of the 3rd Pilot operated check valve is connected with the rod chamber hydraulic fluid port of feather oil hydraulic cylinder 26, and another hydraulic fluid port of the 3rd Pilot operated check valve is connected with a hydraulic fluid port of two-way metering pump 23; A hydraulic fluid port of the 4th Pilot operated check valve is connected with the rodless cavity hydraulic fluid port of feather oil hydraulic cylinder 26, and another hydraulic fluid port of the 4th Pilot operated check valve is connected with another hydraulic fluid port of two-way metering pump 23; The control port of the 3rd Pilot operated check valve and two-way metering pump 23 connect with the oil circuit that is connected the 4th Pilot operated check valve between the feather oil hydraulic cylinder 26; The control port of the 4th Pilot operated check valve and two-way metering pump 23 connect with the oil circuit that is connected the 3rd Pilot operated check valve between the feather oil hydraulic cylinder 26; Other composition is identical with embodiment three with Placement.
Embodiment five: in conjunction with Fig. 3 or 4 explanation present embodiments, present embodiment and embodiment four differences are that the import and export of described feather oil hydraulic cylinder 26 is connected and adopt two to overlap the electro-hydraulic servo power sources at least, the realization redundant configuration.Control system can detect the operating mode of direct drive type hydraulic variable pitch controlling mechanism automatically, when the oil hydraulic circuit of a cover direct drive type hydraulic variable pitch controlling mechanism breaks down decompression, control system automatically switches to the loop of the second cover direct drive type hydraulic variable pitch controlling mechanism, makes the reliability of direct drive type hydraulic variable pitch controlling mechanism improve greatly.When emergency case needs quick shutdown, can control redundant oil hydraulic circuit and work simultaneously, accelerate the speed of feather oil hydraulic cylinder, blade is moved on the position that parallels with wind direction, guarantee that blade no longer rotates.Other composition is identical with embodiment four with Placement.
Content of the present invention is not limited only to the content of the respective embodiments described above, and the combination of one of them or several embodiments equally also can realize the purpose of inventing.
Claims (5)
1. the direct drive type hydraulic variable pitch controlling mechanism that is used for wind-driven generator, it comprises enclosed oil tank (20), AC servo motor (21), two-way metering pump (23), Fill valve (24), bidirectional hydraulic lock (25) and feather oil hydraulic cylinder (26); AC servo motor (21) pto is connected with two-way metering pump (23) power input shaft, two-way metering pump (23) is connected with feather oil hydraulic cylinder (26) by bidirectional hydraulic lock (25), two oil circuits between two-way metering pump (23) and the feather oil hydraulic cylinder (26) are formed closed circuit, two oil inlet and outlets of Fill valve (24) are connected on two oil circuits between two-way metering pump (23) and the feather oil hydraulic cylinder (26), and the 3rd oil inlet and outlet of Fill valve (24) connects the oil inlet and outlet of enclosed oil tank (20); Enclosed oil tank (20), AC servo motor (21), two-way metering pump (23), Fill valve (24) and bidirectional hydraulic lock (25) are formed a cover electro-hydraulic servo power source, and described feather oil hydraulic cylinder (26) connects two cover electro-hydraulic servo power sources at least; It is characterized in that direct drive type hydraulic variable pitch controlling mechanism also comprises often drives 2/2-way solenoid valve (28), normally closed 2/2-way solenoid valve (29) and hydraulic accumulator (31); The rod chamber of feather oil hydraulic cylinder (26) is communicated with enclosed oil tank (20) by often driving 2/2-way solenoid valve (28); The rodless cavity of feather oil hydraulic cylinder (26) is communicated with hydraulic accumulator (31) by normally closed 2/2-way solenoid valve (29).
2. the direct drive type hydraulic variable pitch controlling mechanism that is used for wind-driven generator according to claim 1, it is characterized in that also comprising coupling (22), AC servo motor (21) pto is connected with two-way metering pump (23) power input shaft by coupling (22).
3. the direct drive type hydraulic variable pitch controlling mechanism that is used for wind-driven generator according to claim 1 and 2, it is characterized in that also comprising hand stop valve (27), three hydraulic fluid ports of hand stop valve (27) are connected with the oil inlet and outlet of enclosed oil tank (20), the rod chamber of feather oil hydraulic cylinder (26) and the oil inlet and outlet of rodless cavity respectively.
4. the direct drive type hydraulic variable pitch controlling mechanism that is used for wind-driven generator according to claim 3 is characterized in that Fill valve (24) is made up of two Pilot operated check valves, and two Pilot operated check valves are respectively first Pilot operated check valve and second Pilot operated check valve; Hydraulic fluid port of first Pilot operated check valve and control port are connected with two oil circuits between the feather oil hydraulic cylinder (26) with two-way metering pump (23) respectively, hydraulic fluid port of second Pilot operated check valve and first Pilot operated check valve the oil circuit that control port was connected link to each other, the control port of second Pilot operated check valve and first Pilot operated check valve an oil circuit that hydraulic fluid port was connected link to each other, another hydraulic fluid port of another hydraulic fluid port of first Pilot operated check valve and second Pilot operated check valve is connected with the oil inlet and outlet of enclosed oil tank (20) simultaneously.
5. the direct drive type hydraulic variable pitch controlling mechanism that is used for wind-driven generator according to claim 4, it is characterized in that bidirectional hydraulic lock (25) is made up of two Pilot operated check valves, two Pilot operated check valves are respectively the 3rd Pilot operated check valve and the 4th Pilot operated check valve; A hydraulic fluid port of the 3rd Pilot operated check valve is connected with the rod chamber hydraulic fluid port of feather oil hydraulic cylinder (26), and another hydraulic fluid port of the 3rd Pilot operated check valve is connected with a hydraulic fluid port of two-way metering pump (23); A hydraulic fluid port of the 4th Pilot operated check valve is connected with the rodless cavity hydraulic fluid port of feather oil hydraulic cylinder (26), and another hydraulic fluid port of the 4th Pilot operated check valve is connected with another hydraulic fluid port of two-way metering pump (23); The control port of the 3rd Pilot operated check valve and two-way metering pump (23) connect with the oil circuit that is connected the 4th Pilot operated check valve between the feather oil hydraulic cylinder (26); The control port of the 4th Pilot operated check valve and two-way metering pump (23) connect with the oil circuit that is connected the 3rd Pilot operated check valve between the feather oil hydraulic cylinder (26).
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| CN2009100714231A CN101498281B (en) | 2009-02-20 | 2009-02-20 | Direct drive type hydraulic variable pitch controlling mechanism for wind power generator |
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| CN2009100714231A CN101498281B (en) | 2009-02-20 | 2009-02-20 | Direct drive type hydraulic variable pitch controlling mechanism for wind power generator |
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| CN101498281A CN101498281A (en) | 2009-08-05 |
| CN101498281B true CN101498281B (en) | 2011-01-05 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101813066B (en) * | 2009-12-30 | 2013-01-02 | 上海汇益控制系统股份有限公司 | Direct drive type volume control variable-pitch system of wind-driven generator |
| CN101813104A (en) * | 2009-12-31 | 2010-08-25 | 上海汇益控制系统股份有限公司 | Quickly-propelled low-power and energy-saving hydraulic servo-actuator |
| DE102010019444A1 (en) * | 2010-05-05 | 2011-11-10 | Robert Bosch Gmbh | rotor blade |
| CN102052250B (en) * | 2011-01-21 | 2012-07-04 | 三一电气有限责任公司 | Wind driven generator set and variable propeller pitch system thereof |
| CN102155444A (en) * | 2011-03-08 | 2011-08-17 | 太原理工大学 | Hydraulic actuator for automatic drainage system of coal mine |
| EP3633188B1 (en) | 2018-10-02 | 2021-07-14 | Siemens Gamesa Renewable Energy A/S | Variable flow hydraulic circuit for a wind turbine |
| CN110985460B (en) * | 2019-12-20 | 2021-12-31 | 上海航天控制技术研究所 | Method suitable for switching working conditions of multi-working-condition redundant servo mechanism |
| CN112829926A (en) * | 2021-02-26 | 2021-05-25 | 安徽卓尔航空科技有限公司 | Electro-hydraulic servo constant-speed variable-pitch propeller mechanism |
| CN113323950B (en) * | 2021-05-21 | 2022-03-22 | 杭州诺祥科技有限公司 | Digital electro-hydraulic direct-drive variable pitch system |
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| DE3215571A1 (en) * | 1982-04-27 | 1983-11-03 | Dornier System Gmbh, 7990 Friedrichshafen | Method and apparatus for improving the operating characteristics of a wind energy converter and of working machine(s) connected thereto |
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Effective date of registration: 20200327 Address after: 150001 No. 118 West straight street, Nangang District, Heilongjiang, Harbin Patentee after: Harbin University of technology high tech Development Corporation Address before: 150001 Harbin, Nangang, West District, large straight street, No. 92 Patentee before: HARBIN INSTITUTE OF TECHNOLOGY |