CN102403944A - Variable speed constant frequency method for wind power generation and device thereof - Google Patents
Variable speed constant frequency method for wind power generation and device thereof Download PDFInfo
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Abstract
The invention belongs to the field of wind power generation, particularly to a variable speed constant frequency method for wind power generation and a device thereof; the variable speed constant frequency method obtains signals of wind speed, rotating speed of a wind wheel and the rotating speed of a generator by monitoring, and inputs the signals to a PLC (Programmable Logic Controller) controller; the PLC controller calculates according to certain control algorithm and outputs displacement control signal to regulate the displacement of variable hydraulic pumps and variable hydraulic motors, thereby regulating the rotating speed of the wind wheel to follow the wind speed to operate at variable speed, and regulating the generator to operate at constant frequency; the variable speed constant frequency device comprises a wind wheel, two variable hydraulic pumps, two variable hydraulic motors and a generator; a three-position three-way electromagnetic directional valve is used for controlling the type and the number of the variable hydraulic pumps in real work; and a three-position four-way electromagnetic directional valve is used for controlling the type and the number of the variable hydraulic motors in real work. The method and device provided by the invention realize variable speed constant frequency power generation of a wind power generation device by regulating the displacement of the variable hydraulic pumps and the variable hydraulic motors, thus improving energy capture efficiency and achieving stable energy output of the generator.
Description
Technical field
The invention belongs to wind power generation field, be specifically related to a kind of wind power generation speed change constant frequency method and device thereof.
Background technology
In wind power generation, when wind-driven generator and electrical network parallel running, require the wind-powered electricity generation frequency and the mains frequency of output to be consistent, promptly the wind-powered electricity generation frequency of output keeps constant.Wind power generation comprises constant-speed and constant-frequency generating and two kinds of generation modes of variable speed constant frequency generator.Wherein, the constant-speed and constant-frequency generating is meant in the wind power generation process, keeps generator speed constant, the electric energy that the generator output frequency is constant; Variable speed constant frequency generator is meant in the wind power generation process; The rotating speed of generator can change with change of wind velocity; Make that through certain control method the electric energy that the generator output frequency is constant, variable speed constant frequency generator are a kind of new-generation modes that grows up for 20 end of the centurys.
Publication number is the patent of invention of CN101350589A; Disclose a kind of based on hydraulicdriven current power generation speed-changing constant frequency method and device thereof; This invention adopts hydraulic transmission mode to carry out the conversion of energy, through the discharge capacity of volume adjustable hydraulic pump, variable hydraulic motor being regulated speed change and the constant frequency running that realizes power generation device from sea current.The shortcoming of foregoing invention is: 1, after the volume adjustable hydraulic pump in the power generation device from sea current, the selected model of variable hydraulic motor, the discharge capacity degree of regulation of volume adjustable hydraulic pump, variable hydraulic motor and adjustable range are also just decided and can not be changed; If 2 seawater velocities change hour, the discharge capacity degree of regulation of fixed volume adjustable hydraulic pump and variable hydraulic motor can not adapt to the less variation of seawater velocity, can not guarantee the running precision of variable speed constant frequency; When if 3 seawater velocities change greatly; The discharge capacity of volume adjustable hydraulic pump and variable hydraulic motor need significantly be regulated; The discharge capacity adjustable range that has exceeded fixed volume adjustable hydraulic pump, variable hydraulic motor can not guarantee the running precision of variable speed constant frequency equally.
Summary of the invention
The technical problem that the present invention will solve provides a kind of wind power generation speed change constant frequency method and device thereof; The wind energy of wind wheel being caught through hydraulicdriven mode is delivered to generator end and is used for generating; Realize the variable speed constant frequency generator of wind power generation plant simultaneously through the discharge capacity of regulating two volume adjustable hydraulic pumps and two variable hydraulic motors; Improve the energy capture efficient of wind power generation plant, realized the energy stabilization output of generator.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of wind power generation speed change constant frequency method, specific as follows:
1) wind generator system uses hydraulic transmission; Converting the mechanical energy of wind wheel input into hydraulic pressure through volume adjustable hydraulic pump can export; Can convert the hydraulic pressure of input variable hydraulic motor into mechanical energy again and export to generator, last generator converts the mechanical energy of input into electric energy output; On engine room cover top anemobiagraph is installed and is come measuring wind, a speed probe is installed respectively on wind wheel main shaft and generator shaft; The PLC controller is electrically connected with the variable displacement mechanism of wind speed round transducer, generator speed transducer, anemobiagraph, volume adjustable hydraulic pump and the variable displacement mechanism of variable hydraulic motor respectively;
2) hydraulic transmission uses the different volume adjustable hydraulic pump of two discharge capacity adjustable ranges as input, uses the different variable displacement motor of two discharge capacity adjustable ranges as output; Control the model and the number of actual volume adjustable hydraulic pump of devoting oneself to work through controlling a 3-position-3-way solenoid directional control valve, control model and number that a 3-position 4-way solenoid directional control valve is controlled actual variable hydraulic motor of devoting oneself to work;
3) the wind speed round n that wind speed v signal that anemobiagraph is recorded and wind speed round transducer record
wSignal input PLC controller, the PLC controller calculates and best tip speed ratio λ according to predefined algorithm
OptCorresponding wind wheel optimized rotating speed n
OptWith wind wheel optimized rotating speed n
OptThe wind speed round n that goes out with actual measurement
wCompare, calculate both rotating speed deviation n
We, then according to rotating speed deviation n
WeCalculate the discharge capacity control signal q of volume adjustable hydraulic pump through control algolithm
pAt last, with discharge capacity control signal q
pWith the discharge capacity adjustable range of two volume adjustable hydraulic pumps be foundation; According to selective rule; Judge model and the number of selecting the volume adjustable hydraulic pump that satisfies discharge capacity control requirement; Realize the switching-over action through control 3-position-3-way solenoid directional control valve, the selected volume adjustable hydraulic pump of control is devoted oneself to work and it is carried out discharge capacity regulate; Discharge capacity through to volume adjustable hydraulic pump is regulated, and has realized the adjusting to the countertorque in the volume adjustable hydraulic pump rotating shaft, and then has realized the adjusting to wind speed round;
The rotation speed n of the magneto alternator that 4) the generator speed transducer is recorded
gSignal input PLC controller, the PLC controller is with the rated speed n of expectation
GNGenerator speed n with actual measurement
gCompare, obtain rotating speed deviation n
Ge, then according to rotating speed deviation n
GeCalculate the discharge capacity control signal q of variable hydraulic motor through control algolithm
mAt last, with discharge capacity control signal q
mWith the discharge capacity adjustable range of two variable hydraulic motors be foundation; According to selective rule; Judge model and the number of selecting the variable hydraulic motor that satisfies discharge capacity control requirement; Realize the switching-over action through control 3-position 4-way solenoid directional control valve, the selected variable hydraulic motor of control is devoted oneself to work and it is carried out discharge capacity regulate; Discharge capacity through to variable hydraulic motor is regulated, and has realized the adjusting to the variable hydraulic motor rotating speed, has also promptly realized the rotational speed regulation to magneto alternator, and the invariablenes turning speed that makes magneto alternator is at rated speed n
GN, and then make magneto alternator can send the electric energy of constant frequency, reached the purpose of variable speed constant frequency generator.
A kind of wind power generation speed change constant frequency device, said device comprise wind wheel, two volume adjustable hydraulic pumps, two variable hydraulic motors and generator; The rotating shaft of said wind wheel connects the rotating shaft of first volume adjustable hydraulic pump and the rotating shaft of second volume adjustable hydraulic pump successively, and the rotating shaft of first variable hydraulic motor connects the rotating shaft of second variable hydraulic motor and the rotating shaft of generator successively.The input port of the input port of said first volume adjustable hydraulic pump and said second volume adjustable hydraulic pump all is connected with fuel tank; The delivery outlet of the delivery outlet of said first volume adjustable hydraulic pump and said second volume adjustable hydraulic pump is connected on the A mouth and B mouth of 3-position-3-way solenoid directional control valve, and the C mouth of 3-position-3-way solenoid directional control valve is connected with fuel tank; The delivery outlet of the delivery outlet of said first volume adjustable hydraulic pump and said second volume adjustable hydraulic pump all is connected with the G mouth of 3-position 4-way solenoid directional control valve through unidirectional valve.The input port of the input port of said first variable hydraulic motor and said second variable hydraulic motor is connected on the D mouth and E mouth of 3-position 4-way solenoid directional control valve, the F mouth of 3-position 4-way solenoid directional control valve and being connected of fuel tank; The delivery outlet of the delivery outlet of said first variable hydraulic motor and said second variable hydraulic motor all is connected with fuel tank.On the delivery outlet of unidirectional valve and pipeline that the G mouth of 3-position 4-way solenoid directional control valve is connected, be provided with an accumulator, said accumulator is connected with the delivery outlet of unidirectional valve through a break valve.The PLC controller is electrically connected with the change discharge capacity actuator of anemobiagraph, wind speed round transducer, generator speed transducer, two volume adjustable hydraulic pumps and the change discharge capacity actuator of two variable hydraulic motors respectively.
Further, be provided with a safety valve in the exit of said unidirectional valve, the delivery outlet of said safety valve is connected with fuel tank.
Further, the delivery outlet of the delivery outlet of said first variable hydraulic motor and said second variable hydraulic motor is connected with fuel tank through a cooler respectively.
Further, the input port of the input port of said first volume adjustable hydraulic pump and said second volume adjustable hydraulic pump is connected with fuel tank through first oil filter respectively, and the F mouth of 3-position 4-way solenoid directional control valve is connected with fuel tank through second oil filter.
Adopt the present invention to have following beneficial effect:
1, a kind of wind power generation speed change constant frequency method of the present invention and device thereof; Discharge capacity through regulated variable hydraulic pump and variable hydraulic motor realizes the variable speed constant frequency running of wind power generation plant, has two kinds of effects: 1) follow the wind speed variable-speed operation through wind speed round and can realize that the maximum power of wind wheel catches; 2), make the wind-powered electricity generation frequency and the mains frequency of output be consistent through the operation of generator constant frequency.
2, a kind of wind power generation speed change constant frequency method of the present invention and device thereof; Adopt the structure of bivariate pump bivariate motor, make that system's adjustable range is wider, and discharge capacity is when regulating in more among a small circle; Degree of regulation is higher; Simple and reliable, and energy loses lessly in transmittance process, thereby electricity generation system has higher efficient.
3, a kind of wind power generation speed change constant frequency method of the present invention and device thereof; Adopt the hydraulic energy transfer mode; Can not only transmitting large torque, and be flexible the transmission, can firm power output; Compare speed-changing constant frequency method, make the changed speed operation of wind power generation plant and NE BY ENERGY TRANSFER export more steady based on hydraulicdriven speed-changing constant frequency method based on electric means.
4, a kind of wind power generation speed change constant frequency method of the present invention and device thereof have overcome wind energy conversion system gearbox drive failure rate height and the too big unfavorable factor of direct driving motor volume; Simultaneously not only omitted frequency converter, and can the output speed of generator be stabilized near the rated value, the wind power generation pattern revert to the synchronous generator constant-speed operation and directly to the pattern of mains supply, has simplified the complete machine structure of wind-force unit greatly.
Description of drawings
Do further detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 1 is the control principle figure of a kind of wind power generation speed change constant frequency method of the embodiment of the invention;
Fig. 2 is the fundamental diagram of a kind of wind power generation speed change constant frequency device of the embodiment of the invention;
Fig. 3 is the tip speed ratio λ of wind wheel and the energy capture rate C of wind wheel
PBetween graph of relation.
Embodiment
With reference to accompanying drawing 1.A kind of wind power generation speed change constant frequency method realizes the variable speed constant frequency running of wind generator system through the method that is described below.
1) wind generator system uses hydraulic transmission; Converting the mechanical energy of wind wheel input into hydraulic pressure through volume adjustable hydraulic pump can export; Can convert the hydraulic pressure of input variable hydraulic motor into mechanical energy again and export to generator, last generator converts the mechanical energy of input into electric energy output; On engine room cover top anemobiagraph is installed and is come measuring wind, a speed probe is installed respectively on wind wheel main shaft and generator shaft; The PLC controller is electrically connected with the variable displacement mechanism of wind speed round transducer, generator speed transducer, anemobiagraph, volume adjustable hydraulic pump and the variable displacement mechanism of variable hydraulic motor respectively.
2) hydraulic transmission uses the different volume adjustable hydraulic pump of two discharge capacity adjustable ranges as input, uses the different variable displacement motor of two discharge capacity adjustable ranges as output; Control the model and the number of actual volume adjustable hydraulic pump of devoting oneself to work through controlling a 3-position-3-way solenoid directional control valve, control model and number that a 3-position 4-way solenoid directional control valve is controlled actual variable hydraulic motor of devoting oneself to work.
3) the wind speed round n that wind speed v signal that anemobiagraph is recorded and wind speed round transducer record
wSignal input PLC controller, the PLC controller is according to predefined wind wheel optimum speed n
OptCalculation procedure calculates and best tip speed ratio λ
OptCorresponding wind wheel optimized rotating speed n
Opt, best tip speed ratio λ in the PLC controller
OptBe stored as a constant; With wind wheel optimized rotating speed n
OptThe wind speed round n that goes out with actual measurement
wCompare, calculate both rotating speed deviation n
We, then according to rotating speed deviation n
We, calculate the discharge capacity control signal q of volume adjustable hydraulic pump through the digital PID control algolithm of PLC controller storage inside
pAt last, with discharge capacity control signal q
pWith the discharge capacity adjustable range of two volume adjustable hydraulic pumps be foundation; According to the volume adjustable hydraulic pump selective rule; Judge model and the number of selecting the volume adjustable hydraulic pump that satisfies discharge capacity control requirement; Realize the switching-over action through control 3-position-3-way solenoid directional control valve, the selected volume adjustable hydraulic pump of control is devoted oneself to work and it is carried out discharge capacity regulate.
Select the principle of actual volume adjustable hydraulic pump of devoting oneself to work to be:
Preestablish a, b, c between three sections discharge capacity regulatory regions, wherein the scope of a is minimum between the discharge capacity regulatory region, and the scope of c is maximum between the discharge capacity regulatory region, and the scope of b is placed in the middle between the discharge capacity regulatory region.If required regulated variable hydraulic pressure pump delivery is in a between the discharge capacity regulatory region, control 3-position-3-way electromagnetic switch valve events makes the little volume adjustable hydraulic pump of discharge capacity adjustable range devote oneself to work, thereby keeps degree of regulation.If required regulated variable hydraulic pressure pump delivery is in b between the discharge capacity regulatory region, control 3-position-3-way electromagnetic switch valve events makes the big volume adjustable hydraulic pump of discharge capacity adjustable range devote oneself to work.If required regulated variable hydraulic pressure pump delivery is in c between the discharge capacity regulatory region, the discharge capacity adjustable range of a volume adjustable hydraulic pump is not enough to satisfy discharge capacity and regulates requirement, and control 3-position-3-way electromagnetic switch valve events makes two volume adjustable hydraulic pumps devote oneself to work simultaneously.
Discharge capacity through to volume adjustable hydraulic pump is regulated, and has realized the adjusting to the countertorque in the volume adjustable hydraulic pump rotating shaft, and then has realized the adjusting to wind speed round, and the control wind speed round is followed change of wind velocity all the time, runs on best tip speed ratio λ all the time
OptThe place realizes that the maximum power of wind wheel is caught, and improves the energy capture efficient of wind wheel.
The rotation speed n of the magneto alternator that 4) the generator speed transducer is recorded
gSignal input PLC controller, the PLC controller is with the rated speed n of expectation
GNGenerator speed n with actual measurement
gCompare, obtain rotating speed deviation n
Ge, then according to rotating speed deviation n
Ge, calculate the discharge capacity control signal q of variable hydraulic motor through the digital PID control algolithm of PLC controller storage inside
mAt last, with discharge capacity control signal q
mWith the discharge capacity adjustable range of two variable hydraulic motors be foundation; According to the variable hydraulic motor selective rule; Judge model and the number of selecting the variable hydraulic motor that satisfies discharge capacity control requirement; Realize the switching-over action through control 3-position 4-way solenoid directional control valve, the selected variable hydraulic motor of control is devoted oneself to work and it is carried out discharge capacity regulate.
Select the principle of actual variable hydraulic motor of devoting oneself to work to be:
Preestablish d, e, f between three sections discharge capacity regulatory regions, wherein the scope of d is minimum between the discharge capacity regulatory region, and the scope of f is maximum between the discharge capacity regulatory region, and the scope of e is placed in the middle between the discharge capacity regulatory region.If the discharge capacity of required regulated variable hydraulic motor is in d between the discharge capacity regulatory region, control 3-position 4-way electromagnetic switch valve events makes the little variable hydraulic motor of discharge capacity adjustable range devote oneself to work, thereby keeps degree of regulation.If the discharge capacity of required regulated variable hydraulic motor is in e between the discharge capacity regulatory region, control 3-position 4-way electromagnetic switch valve events makes the big variable hydraulic motor of discharge capacity adjustable range devote oneself to work.If the discharge capacity of required regulated variable hydraulic motor is in f between the discharge capacity regulatory region; The discharge capacity adjustable range of a variable hydraulic motor is not enough to satisfy discharge capacity and regulates requirement, and control 3-position 4-way electromagnetic switch valve events makes two variable hydraulic motors devote oneself to work simultaneously.
The change of variable displacercent pump and rotating speed will cause the fluid flow Q that from volume adjustable hydraulic pump, flows out to change.By flow Q and variable hydraulic motor discharge capacity q
mAnd variable hydraulic motor rotation speed n
mConcern Q=q
mn
mCan know, when the flow that flows through variable hydraulic motor changes, through changing the discharge capacity q of variable hydraulic motor
mJust can keep the rotating speed of variable hydraulic motor constant, thus the magneto alternator invariablenes turning speed that maintenance links to each other with variable hydraulic motor, and promptly magneto alternator remains on rated speed n
GN, reach the purpose of variable speed constant frequency generator.
With reference to accompanying drawing 2.A kind of wind power generation speed change constant frequency device, this device comprise wind wheel 10, two volume adjustable hydraulic pumps, two variable hydraulic motors and generator 20, and said generator 20 is a magneto alternator.Said wind power generation speed change constant frequency device adopts hydraulic transmission to transmit energy; Wherein, The rotating shaft of said wind wheel 10 connects the rotating shaft of first volume adjustable hydraulic pump 31 and the rotating shaft of second volume adjustable hydraulic pump 32 successively, and the rotating shaft of first variable hydraulic motor 41 connects the rotating shaft of second variable hydraulic motor 42 and the rotating shaft of generator 20 successively.
The input port of the input port of said first volume adjustable hydraulic pump 31 and said second volume adjustable hydraulic pump 32 is connected with fuel tank 50 through first oil filter 92 respectively; The delivery outlet of the delivery outlet of said first volume adjustable hydraulic pump 31 and said second volume adjustable hydraulic pump 32 is connected on the A mouth and B mouth of 3-position-3-way solenoid directional control valve 61, and the C mouth of 3-position-3-way solenoid directional control valve 61 is connected with fuel tank; The delivery outlet of the delivery outlet of said first volume adjustable hydraulic pump 31 and said second volume adjustable hydraulic pump 32 all is connected with the G mouth of 3-position 4-way solenoid directional control valve 63 through unidirectional valve 62.
The input port of the input port of said first variable hydraulic motor 41 and said second variable hydraulic motor 42 is connected on the D mouth and E mouth of 3-position 4-way solenoid directional control valve 63, and the F mouth of 3-position 4-way solenoid directional control valve 63 is connected with fuel tank through second oil filter 93; The delivery outlet of the delivery outlet of said first variable hydraulic motor 41 and said second variable hydraulic motor 42 all is connected with fuel tank 50; The delivery outlet of the delivery outlet of said first variable hydraulic motor 41 and said second variable hydraulic motor 42 is connected with fuel tank through a cooler 91 respectively.
On the delivery outlet of unidirectional valve 62 and pipeline that the G mouth of 3-position 4-way solenoid directional control valve 63 is connected, be provided with an accumulator 70, said accumulator 70 is connected with the delivery outlet of unidirectional valve 62 through a break valve 64; Be provided with a safety valve 65 in the exit of said unidirectional valve 62, the delivery outlet of said safety valve 65 is connected with fuel tank.
The PLC controller is electrically connected with anemobiagraph 81, wind speed round transducer 82, generator speed transducer 83, the change discharge capacity actuator of two volume adjustable hydraulic pumps and the change discharge capacity actuator of two variable hydraulic motors respectively.
3-position-3-way solenoid directional control valve 61 is used to control actual volume adjustable hydraulic pump model and number of devoting oneself to work in the wind power generation speed change constant frequency device, and 3-position 4-way solenoid directional control valve 63 is used to control actual variable hydraulic motor model and number of devoting oneself to work.Unidirectional valve 62 prevents in the hydraulic transmission fluid volume adjustable hydraulic pump that flows backwards back.Safety valve 65 is used to prevent the hydraulic transmission hypertonia.Accumulator 70 can store unnecessary fluid, plays the effect that the pressure oscillation of buffering hydraulic transmission is impacted again.Break valve 64 can seal hydraulic oil liquid when hydraulic transmission is installed and keep in repair.The fluid cooling that cooler 91 will flow out from variable hydraulic motor is so that fluid entering variable hydraulic pump recycle once more.
The operation principle of said wind power generation speed change constant frequency device is:
With reference to accompanying drawing 3.Relation curve between the tip speed ratio through wind wheel and the energy capture efficient of wind wheel is explained through the wind wheel variable-speed operation and is realized the theoretical foundation that maximum power is caught, is described below:
When tip speed ratio λ (ratio of the linear velocity of wind wheel blade tip and wind speed) equals best tip speed ratio λ
OptThe time, the energy capture rate C of wind wheel
PCan get maximum C
PmaxBy λ=2 π n
w(wherein v is a wind speed to R/ (60v), and R is the radius of wind wheel, n
wRotating speed for wind wheel), can know below rated wind speed, when wind speed v changes, change the rotation speed n of wind wheel
wJust can keep tip speed ratio λ and be in best tip speed ratio λ
OptThe place, thus guarantee that wind wheel catches the power maximum.To remove to change the rotating speed of wind wheel along with the change of wind speed, can be through changing the countertorque T in the volume adjustable hydraulic pump rotating shaft
pRealize.And countertorque T
p=p
pq
p/ (2 π), wherein p
pBe the outlet pressure of volume adjustable hydraulic pump, q
pBe the discharge capacity of volume adjustable hydraulic pump, p
pBe load decision, and the load of electricity generation system can be considered constant, so regulated variable hydraulic pressure pump delivery q by electricity generation system
pJust can change the countertorque T in the volume adjustable hydraulic pump rotating shaft
p, and then change the rotating speed of wind wheel, reach the rated wind speed purpose that the wind wheel maximum power is caught when following.
Claims (5)
1. wind power generation speed change constant frequency method is characterized in that:
1) wind generator system uses hydraulic transmission; Converting the mechanical energy of wind wheel input into hydraulic pressure through volume adjustable hydraulic pump can export; Can convert the hydraulic pressure of input variable hydraulic motor into mechanical energy again and export to generator, last generator converts the mechanical energy of input into electric energy output; On engine room cover top anemobiagraph is installed and is come measuring wind, a speed probe is installed respectively on wind wheel main shaft and generator shaft; The PLC controller is electrically connected with the variable displacement mechanism of wind speed round transducer, generator speed transducer, anemobiagraph, volume adjustable hydraulic pump and the variable displacement mechanism of variable hydraulic motor respectively;
2) hydraulic transmission uses the different volume adjustable hydraulic pump of two discharge capacity adjustable ranges as input, uses the different variable displacement motor of two discharge capacity adjustable ranges as output; Control the model and the number of actual volume adjustable hydraulic pump of devoting oneself to work through controlling a 3-position-3-way solenoid directional control valve, control model and number that a 3-position 4-way solenoid directional control valve is controlled actual variable hydraulic motor of devoting oneself to work;
3) the wind speed round n that wind speed v signal that anemobiagraph is recorded and wind speed round transducer record
wSignal input PLC controller, the PLC controller calculates and best tip speed ratio λ according to predefined algorithm
OptCorresponding wind wheel optimized rotating speed n
OptWith wind wheel optimized rotating speed n
OptThe wind speed round n that goes out with actual measurement
wCompare, calculate both rotating speed deviation n
We, then according to rotating speed deviation n
WeCalculate the discharge capacity control signal q of volume adjustable hydraulic pump through control algolithm
pAt last, with discharge capacity control signal q
pWith the discharge capacity adjustable range of two volume adjustable hydraulic pumps be foundation; According to selective rule; Judge model and the number of selecting the volume adjustable hydraulic pump that satisfies discharge capacity control requirement; Realize the switching-over action through control 3-position-3-way solenoid directional control valve, the selected volume adjustable hydraulic pump of control is devoted oneself to work and it is carried out discharge capacity regulate; Discharge capacity through to volume adjustable hydraulic pump is regulated, and has realized the adjusting to the countertorque in the volume adjustable hydraulic pump rotating shaft, and then has realized the adjusting to wind speed round;
The rotation speed n of the magneto alternator that 4) the generator speed transducer is recorded
gSignal input PLC controller, the PLC controller is with the rated speed n of expectation
GNGenerator speed n with actual measurement
gCompare, obtain rotating speed deviation n
Ge, then according to rotating speed deviation n
GeCalculate the discharge capacity control signal q of variable hydraulic motor through control algolithm
mAt last, with discharge capacity control signal q
mWith the discharge capacity adjustable range of two variable hydraulic motors be foundation; According to selective rule; Judge model and the number of selecting the variable hydraulic motor that satisfies discharge capacity control requirement; Realize the switching-over action through control 3-position 4-way solenoid directional control valve, the selected variable hydraulic motor of control is devoted oneself to work and it is carried out discharge capacity regulate; Discharge capacity through to variable hydraulic motor is regulated, and has realized the adjusting to the variable hydraulic motor rotating speed, has also promptly realized the rotational speed regulation to magneto alternator, and the invariablenes turning speed that makes magneto alternator is at rated speed n
GN, and then make magneto alternator can send the electric energy of constant frequency, reached the purpose of variable speed constant frequency generator.
2. wind power generation speed change constant frequency device is characterized in that: said device comprises wind wheel (10), two volume adjustable hydraulic pumps, two variable hydraulic motors and generator (20); The rotating shaft of said wind wheel (10) connects the rotating shaft of first volume adjustable hydraulic pump (31) and the rotating shaft of second volume adjustable hydraulic pump (32) successively, and the rotating shaft of first variable hydraulic motor (41) connects the rotating shaft of second variable hydraulic motor (42) and the rotating shaft of generator (20) successively;
The input port of the input port of said first volume adjustable hydraulic pump (31) and said second volume adjustable hydraulic pump (32) all is connected with fuel tank (50); The delivery outlet of the delivery outlet of said first volume adjustable hydraulic pump (31) and said second volume adjustable hydraulic pump (32) is connected on the A mouth and B mouth of 3-position-3-way solenoid directional control valve (61), and the C mouth of 3-position-3-way solenoid directional control valve (61) is connected with fuel tank; The delivery outlet of the delivery outlet of said first volume adjustable hydraulic pump (31) and said second volume adjustable hydraulic pump (32) all is connected through the G mouth of unidirectional valve (62) with 3-position 4-way solenoid directional control valve (63);
The input port of the input port of said first variable hydraulic motor (41) and said second variable hydraulic motor (42) is connected on the D mouth and E mouth of 3-position 4-way solenoid directional control valve (63), and the F mouth of 3-position 4-way solenoid directional control valve (63) is connected with fuel tank; The delivery outlet of the delivery outlet of said first variable hydraulic motor (41) and said second variable hydraulic motor (42) all is connected with fuel tank (50);
On the delivery outlet of unidirectional valve (62) and pipeline that the G mouth of 3-position 4-way solenoid directional control valve (63) is connected, be provided with an accumulator (70), said accumulator (70) is connected through the delivery outlet of a break valve (64) with unidirectional valve (62);
The PLC controller is electrically connected with the change discharge capacity actuator of anemobiagraph (81), wind speed round transducer (82), generator speed transducer (83), two volume adjustable hydraulic pumps and the change discharge capacity actuator of two variable hydraulic motors respectively.
3. according to the described a kind of wind power generation speed change constant frequency device of claim 2, it is characterized in that: be provided with a safety valve (65) in the exit of said unidirectional valve (62), the delivery outlet of said safety valve (65) is connected with fuel tank.
4. according to claim 2 or 3 described a kind of wind power generation speed change constant frequency devices, it is characterized in that: the delivery outlet of the delivery outlet of said first variable hydraulic motor (41) and said second variable hydraulic motor (42) is connected with fuel tank through a cooler (91) respectively.
5. according to the described a kind of wind power generation speed change constant frequency device of claim 4; It is characterized in that: the input port of the input port of said first volume adjustable hydraulic pump (31) and said second volume adjustable hydraulic pump (32) is connected with fuel tank through first oil filter (92) respectively, and the F mouth of 3-position 4-way solenoid directional control valve (63) is connected with fuel tank through second oil filter (93).
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| CN201110213446.9A CN102403944B (en) | 2011-07-28 | 2011-07-28 | Variable speed constant frequency method for wind power generation and device thereof |
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| CN107781111A (en) * | 2017-09-15 | 2018-03-09 | 燕山大学 | Energy storage type hydraulic wind power generating set primary frequency control system and control method |
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| CN114321030A (en) * | 2021-11-16 | 2022-04-12 | 国家电投集团科学技术研究院有限公司 | Hydraulic power generation system and control method thereof |
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| CN107781111A (en) * | 2017-09-15 | 2018-03-09 | 燕山大学 | Energy storage type hydraulic wind power generating set primary frequency control system and control method |
| CN113153650A (en) * | 2021-03-12 | 2021-07-23 | 中国大唐集团新能源科学技术研究院有限公司 | Fault monitoring device of wind turbine generator and using method thereof |
| CN114321030A (en) * | 2021-11-16 | 2022-04-12 | 国家电投集团科学技术研究院有限公司 | Hydraulic power generation system and control method thereof |
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