CN106788017B - A kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system and method - Google Patents
A kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system and method Download PDFInfo
- Publication number
- CN106788017B CN106788017B CN201611041674.1A CN201611041674A CN106788017B CN 106788017 B CN106788017 B CN 106788017B CN 201611041674 A CN201611041674 A CN 201611041674A CN 106788017 B CN106788017 B CN 106788017B
- Authority
- CN
- China
- Prior art keywords
- wind
- generator
- speed
- speed limit
- electromagnetism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
Abstract
The embodiment of the invention provides a kind of small-sized fixed pitch wind-driven generators to assist speed limiting system and method, the system comprises: electromagnetism speed limit device, uncontrollable rectifier power supply unit and intelligent control switch, electromagnetism speed limit device are arranged between wind turbine and generator；Uncontrollable rectifier power supply unit is connect with generator, is the power supply of electromagnetism speed limit device by intelligent control switch.The described method includes: uncontrollable rectifier power supply unit obtains the part alternating current of generator, it is the power supply of electromagnetism speed limit device by intelligent control switch；Intelligent control switch measures and judges that the output voltage of uncontrollable rectifier power supply unit is greater than or equal to voltage threshold, then intelligent control switch is closed；Electromagnetism speed limit device is powered and generates magnetic field, further generates electromagnetism speed limit braking moment, and the part wind energy that consumption wind turbine absorbs reduces the revolving speed of generator rotor shaft.The embodiment of the present invention realizes wind generator system and crosses wind speed defencive function, guarantees it in a degree of energy normal power generation under crossing wind speed environments.
Description
Technical field
The present embodiments relate to technical field of wind power generation, and in particular to a kind of small-sized fixed pitch wind-driven generator auxiliary
Speed limiting system and method.
Background technique
Wind energy becomes the new energy of countries in the world attention because of characteristics such as its environmentally protective, widely distributed and energy abundances
One of source.For the electrical problem of some outlying mountain areas, farming and pastoral area, the development of wind generating technology provides a good solution
Certainly method.But under field conditions (factors), there is very big randomness in wind speed and direction, and strong wind weather bring crosses wind speed and be easy to cause wind
The input power of Force system is excessively high, so that blower and generator rotor shaft revolving speed are too fast, causes that the driving of wind turbine is out of control, burns
Generator and rectifier control circuit, damage battery even result in mechanical part and the serious consequences such as fall off.
Therefore, it if the armature spindle revolving speed of wind turbine and generator can effectively be limited when crossing wind speed, is not only avoided that
The too fast bring of armature spindle revolving speed is seriously damaged, moreover it is possible to be operated in wind generator system normally on wind speed interval, be improved
The wind speed of wind generator system utilizes the section upper limit, increases wind power system generated energy, increases wind energy utilization.Therefore it is sent out in wind-force
It in the application process of electric system, studied under wind speed, the technical method for limiting wind generator system armature spindle revolving speed is necessary.
In the prior art, the speed limit mode of small-sized fan mainly includes three kinds, and one is mechanical braking speed limits: common mechanical braking limit
Fast mode is effective front face area by reducing wind wheel, achievees the effect that reduce absorption wind energy, and then the limit of complete paired systems
Fast function, mainly includes two ways: (1) so that wind wheel is deviateed wind direction with certain mechanism；(2) wind wheel is changed with certain mechanism
Blade pitch angle.Wherein, the architectural characteristic of fixed pitch wind-driven generator makes it can not be by using change rotor blade pitch angle
Method, general only pitch-controlled wind-driven generator just can reduce blower by changing rotor blade pitch angle to realize
Revolving speed.And method (1) uses the structure for changing wind wheel direction windward, its main feature is that the head of small-sized fan or some component are in
Dynamic support state, mechanical wear caused by longtime running also will increase the fit clearance of device, cause protection lag, fail with
And violent vibration.And the setting of yaw system also tends to expensive and complicated, high failure rate, and the profession of maintenance requires
It is higher.Another kind is resistive braking: resistive braking speed limit mode refers to when wind-driven generator revolving speed is more than threshold values, calculates current
The corresponding resistance of maximum reverse braking moment under revolving speed, and the revolving speed of blower is controlled by adjusting the realization of parallel resistance value.When
Using the method for changing parallel resistance quantity, when adjusting ohmic load, to have the advantages of adjusting is simple, high reliablity；But
When parallel resistance, which is devoted oneself to work, carries out speed limit, the winding current of generator also be will increase, and the electric current that this has aggravated generator is negative
Load, while the limitation of generator windings electric current also reduces the adjustable range of resistive braking.There are also one is friction speed limits: friction
Limit speed for braking condition mode is to install bremsbelage, brake arm or hydraulic device, electric switch in systems to be completed according to wind velocity signal
Opening and closing movement realizes the control to brake arm, friction plate or hydraulic device, achievees the effect that limiting brake.This method
The friction member abrasion of use is very fast, and the contact in braking process between component can also cause to shake.And wherein hydraulic speed-limiting is braked
The cost of method is also higher, and maintenance period is short, while the Applicable temperature range of water brake is also limited.
Therefore, a kind of method how is proposed, it can be in the feelings for not significantly affecting each component of wind generator system and being laid out substantially
Under condition, it can be effectively reduced the revolving speed of wind generator system armature spindle when wind speed is excessive, guarantee wind generator system in wind speed
It remains to work normally when excessive, becomes urgent problem to be solved.
Summary of the invention
Aiming at the shortcomings in the prior art, the embodiment of the present invention provides a kind of small-sized fixed pitch wind-driven generator auxiliary speed limit
System and method.
On the one hand, the embodiment of the present invention provides a kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system, comprising: electromagnetism
Speed-limiting device, uncontrollable rectifier power supply unit and intelligent control switch, the electromagnetism speed limit device are arranged in wind turbine and power generation
Between machine, the revolving speed of the generator rotor shaft is reduced by generating electromagnetism speed limit braking moment；The uncontrollable rectifier power supply
Device is connect with the generator, the part alternating current of generator is rectified into direct current, and pass through the intelligent control switch
For electromagnetism speed limit device power supply.
On the other hand, the embodiment of the present invention provides a kind of application wind-driven generator auxiliary speed limiting system progress wind-driven generator
The method for assisting speed limit, comprising:
Uncontrollable rectifier power supply unit obtains the part alternating current of generator, and the AC rectification is sent at direct current
To intelligent control switch；
The intelligent control switch measures the output voltage of the uncontrollable rectifier power supply unit, if the output is known in judgement
Voltage is greater than or equal to voltage threshold, then the intelligent control switch closure；
Electromagnetism speed limit device is powered and generates magnetic field, further generates electromagnetism speed limit braking moment, and consumption wind turbine absorbs
Part wind energy, reduce the revolving speed of generator rotor shaft.
Wind-driven generator auxiliary speed limiting system provided in an embodiment of the present invention and method, when wind generator system was in wind
When speed operation, electro-magnetic braking device starting is started to work, and electromagnetism speed limit braking moment is generated, and consumes part wind energy, guarantees wind
The armature spindle revolving speed of turbine and generator is in normal range (NR) so that wind generator system it is a degree of cross wind speed under still
It can work normally, both realize wind generator system and crossed wind speed defencive function, the wind speed for also improving wind generator system utilizes
The section upper limit increases wind power system generated energy, increases wind energy utilization.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram that wind-driven generator assists speed limiting system and wind generator system in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of electromagnetism speed limit device in the embodiment of the present invention；
Fig. 3 is the schematic diagram of the brake disc generation electromagnetism speed limit braking moment in the embodiment of the present invention；
Fig. 4 is the magnetic line of force distribution schematic diagram of winding coil in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of intelligent control switch in the embodiment of the present invention；
Fig. 6 is that the wind-driven generator in the embodiment of the present invention assists the power-balance of speed limiting system to adjust path schematic diagram；
Fig. 7 is the flow diagram that wind-driven generator assists method for limiting speed in the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 is the structural schematic diagram that wind-driven generator assists speed limiting system and wind generator system in the embodiment of the present invention,
As shown in Figure 1, wind-driven generator auxiliary speed limiting system provided in an embodiment of the present invention includes: electromagnetism speed limit device 5, uncontrollable rectifier
Power supply unit, 6 and intelligent control switch 7, electromagnetism speed limit device 5 are arranged between wind turbine 1 and generator 2, pass through generation
Electromagnetism speed limit braking moment reduces by the revolving speed of 2 armature spindle of generator；Uncontrollable rectifier power supply unit 6 is connect with generator 2, will be sent out
The part alternating current of motor 2 is rectified into direct current, and is the power supply of electromagnetism speed limit device 5 by intelligent control switch 7.
Specifically, as shown in Figure 1, wind generator system generally includes wind turbine 1, generator 2, system commutation inversion device
3 and terminal output 4, wind turbine 1 absorb wind energy after, driven generator 2 operate；The electric energy that generator 2 produces is whole by system
Inverter 3 is flowed, standard electric energy is converted into, standard electric energy is delivered to the terminals such as battery or power grid output 4.When wind speed is excessive
When, the revolving speed of wind turbine 1 can be more than its rated speed, and wind turbine 1 and generator 2 are coaxial rotatings, the rotation driving of wind turbine 1
Generator 2 rotates, and when 1 revolving speed of wind turbine is excessive, 1 driving of wind turbine can be caused out of control, and turn of the armature spindle of generator 2
Speed also can be too fast, so that the power of generator 2 is excessive, leads to generator 2, rectifier control device 3 and battery or power grid
Etc. terminals output 4 burn.Electromagnetism speed limit device 5 is arranged in the embodiment of the present invention between wind turbine 1 and generator 2, and is provided with
The uncontrollable rectifier power supply unit 6 connecting with generator 2, uncontrollable rectifier power supply unit 6 have the characteristics that capacity is small comprising bridge-type
The part alternating current obtained from generator 2 is rectified into direct current, and is by intelligent control switch 7 by uncontrollable rectifier circuit
Electromagnetism speed limit device 5 is powered.Certainly AC rectification specifically be can also be into other methods at the method for direct current, the present invention is real
Example is applied to be not especially limited.When wind-force is excessive, intelligent control switch 7 is closed so that uncontrollable rectifier power supply unit 6 is electromagnetism limit
Speed variator 5 is powered.Electromagnetism speed limit device 5 can generate electromagnetism speed limit braking moment after being powered, offset part wind generator system
Input torque, the part wind energy that consumption wind turbine 1 absorbs, to reduce the revolving speed of the armature spindle of generator 2.
When wind speed is excessive, system commutation inversion device 3 will start wind speed protection and disconnect, so that wind generator system
Without power output.Therefore uncontrollable rectifier power supply unit 6 is connect with generator 2, does not obtain electricity from system commutation inversion device 3
It can, it can be ensured that when system commutation inversion device 3 being caused to start wind speed protection because crossing wind speed, uncontrollable rectifier power supply unit 6
It remains to obtain alternating current from generator 2, ensure that electromagnetism speed limit device 5 has reliable power supply source that can normally complete speed limit work
Make.Generator 2 is by uncontrollable rectifier power supply unit 6 directly to the mode of the power supply of electromagnetism speed limit device 5 but also electromagnetism limits simultaneously
The speed limit effect and the same trend of wind speed of speed variator 5, i.e. wind speed more day of one's doom effect are also better.
Wind-driven generator provided in an embodiment of the present invention assists speed limiting system, by being arranged between wind turbine and generator
Electromagnetism speed limit device is powered for it by intelligent control switch by uncontrollable rectifier power supply unit when wind speed is excessive, generates electromagnetism
Limiting brake torque, offsets the input torque of part wind generator system, and the part wind energy that consumption wind turbine absorbs reduces hair
The revolving speed of rotor axis of electric realizes wind generator system and crosses wind speed speed-limiting protection function, allows wind generator system in certain journey
Degree is crossed under wind speed environments with normal rotor speed stable operation.In addition, wind-driven generator provided in an embodiment of the present invention is auxiliary
Speed limiting system is helped, structure is simple, small volume, and the influence installed to wind generator system basic structure is also smaller.
Fig. 2 is the structural schematic diagram of electromagnetism speed limit device in the embodiment of the present invention, as shown in Fig. 2, in above-described embodiment
On the basis of, the electromagnetism speed limit device includes: brake disc 21 and the iron core 22 with winding coil, and brake disc 21 is arranged in wind turbine
Between 1 and generator 2, with 2 coaxial rotating of wind turbine 1 and generator；Winding coil in iron core 22 with winding coil with
Intelligent control switch 7 connects, and the distance between the iron core 22 with winding coil and brake disc 21 are not less than pre-determined distance, so that
The magnetic line of force that the winding coil of energization generates can be cut by obtaining after brake disc 21 rotates, to generate electromagnetism speed limit braking moment.
Specifically, as shown in Fig. 2, electromagnetism speed limit device 5 includes brake disc 21 and the iron core 22 with winding coil, wherein making
Moving plate 21 is arranged between wind turbine 1 and generator 2, and with 2 coaxial rotating of wind turbine 1 and generator, i.e. brake disc 21 sets
It sets on the armature spindle 24 that wind turbine 1 is connected with generator 2, with 24 coaxial rotating of armature spindle.Wherein the material of brake disc 21 is
There is the metal of good magnetic conductivity, specifically can be iron or steel, can also be that other have the metal of good magnetic conductivity, this hair certainly
Bright embodiment is not especially limited.Winding coil 23 in iron core 22 with winding coil is connect with intelligent control switch 7, by intelligence
Can control switch 7 and control uncontrollable rectifier power supply unit 6 is that the winding coil 23 in the iron core 22 with winding coil is powered.Band winding
The distance between the iron core 22 of coil and brake disc 21 are not less than pre-determined distance, and pre-determined distance can be wind power system most severe
In the environment of when working, the iron core 22 with winding coil does not contact still with brake disc 21, and can generate the distance of excitation effect.Both
It ensures the safety of brake disc 21 Yu the iron core with winding coil, also guarantees that brake disc 21 is logical in the iron core 22 with winding coil
In the magnetic field range generated after electricity.When brake disc 21 rotate after, inside can generate eddy current, the metal brake with eddy current
Cutting magnetic field moves after disk 21 rotates, and will receive the effect of Ampere force, to generate electromagnetism speed limit braking moment, consumes wind turbine
The part wind energy of absorption, reduces the revolving speed of generator amature.
Fig. 3 is the schematic diagram of the brake disc generation electromagnetism speed limit braking moment in the embodiment of the present invention, as shown in figure 3, this
The iron core with winding coil in electromagnetism speed limit device that inventive embodiments provide can generate magnetic field after powered up, wherein iron core
Magnetic pole strength width is a, and magnetic pole strength length is b, and the distance of disc centres to pole center is L, wind powered generator system rotation
Angular speed, that is, brake disc angular velocity of rotation be ω.The magnetic field that iron core with winding coil generates passes through brake disc, with system
The rotation of Moving plate, the magnetic flux B across brake disc can change with the variation of time, and then generate eddy current, in magnetic field
By the effect of Ampere force, electromagnetism speed limit braking moment T is generatedBraking.Further electromagnetic system is converted by the power that wind turbine absorbs
Dynamic power PBraking, the part wind energy of wind turbine absorption is consumed, the revolving speed of the armature spindle of wind turbine and generator is reduced.Its
Middle electromagnetism speed limit braking moment TBrakingWith electromagnetic braking power PBrakingFormula can be with reference formula (1)-(7).
TBraking=2BIebL (1)
In formula: TBraking--- braking moment；
B --- across the magnetic induction intensity of brake disc；
Ie--- the virtual value of the vortex generated in brake disc；
The length of the magnetic pole strength of the iron core of b --- winding coil；
L --- the distance in brake disc axle center to pole center.
In formula: Δh--- the skin depth of eddy current on the disc brake rotor；
The projected area of the iron core of S --- winding coil on the disc brake rotor；
The angular velocity of rotation of ω --- brake disc；
The resistivity of ρ --- brake disc.
S=a × b (3)
In formula: a --- the width of the magnetic pole strength of the iron core of winding coil.
In formula: μ0--- space permeability；
μr--- relative permeability.
In formula: N --- the number of turns of winding coil；
I --- the virtual value of the electric current in winding coil；
Rm--- magnetic return path magnetic resistance；
Ke--- conversion factor.
Formula (2), (3), (4) and (5) is brought into formula (1), available electromagnetism speed limit braking moment TBraking, specific to join
See formula (6):
Due to power P=T ω, according to electromagnetism speed limit braking moment TBraking, bring formula (6) into P=T ω, available electricity
Magnetic brake power PBraking, referring specifically to formula (7):
Electromagnetic braking power PBrakingIt is that brake disc is produced by the power that partially absorbs that generation braking moment has shared wind turbine
Raw, when wherein wind generator system is run, shown in the following formula of calculation formula (8) of the absorption power P of wind turbine,
In formula: P --- the absorption power of wind turbine；
CP--- the efficiency of wind turbine；
A --- the frontal area of wind turbine wind wheel；
ηIt is empty--- atmospheric density；
V --- wind speed.
In formula: λ --- tip speed ratio；
The radius of the wind wheel front face area of R --- wind turbine；
ω --- armature spindle revolving speed.
After formula (9) and (10) transformation, substitute into formula (8), available wind turbine absorbs the calculation formula of power, such as
Formula (11)
From formula (11) as can be seen that the revolving speed of armature spindle and the absorption power of wind turbine are proportional, work as wind turbine
Absorb power it is excessive when, armature spindle revolving speed is excessively high, at this time electromagnetism speed limit device start, by generate electromagnetism speed limit braking moment come
Consumption wind turbine partially absorbs power, while the revolving speed for reducing armature spindle, also limits the input power of generator,
Realized wind speed defencive function.Electromagnetic braking power PBrakingIt is that brake disc is generated by generating braking moment, shares
Wind turbine partially absorbs power, and the electromagnetic braking power of generation is dispersed into air in the form of thermal energy on the disc brake rotor, both
It will not influence the mechanical structure of electromagnetism speed limit device, the working environment of generator will not be influenced.It can be seen that wind-power electricity generation system
System under crossing wind friction velocity when running, and after the work of electromagnetism speed limit device, the power that wind turbine absorbs is by electromagnetism speed limit device point
Load ensure that wind generator system is remained in the case where crossing gustiness so that the absorption power of generator is not higher than rated value
Normal power generation.
By formula (6) and formula (7) it is found that after the devices such as winding coil, brake disc are selected and are installed, electromagnetism limit
Fast braking moment TBrakingWith electromagnetic braking power PBrakingOnly in winding coil electric current I, brake disc spins angular velocity omega and
Turn number N is related.Other parameters in formula (6) and (7) are after the devices such as winding coil, brake disc are selected and are installed
It all has determined and known.Each parameter is to electromagnetism speed limit braking moment TBrakingWith electromagnetic braking power PBrakingIt is specific influence it is as follows:
The component part of closed magnetic circuit includes biggish air magnetic circuit in electromagnetism speed limit device, then magnetic circuit is in linear shape
State, the excitation magnetic flux phi that magnetic pole generatesmIt is proportional to the size of current in winding coil.Then as shown in formula (6) and (7),
Electromagnetism speed limit braking moment TBrakingWith electromagnetic braking power PBrakingWith square proportional example linear relationship of coil current I, increase around
Electric current I in group coil can increase electromagnetism speed limit braking moment TBrakingWith electromagnetic braking power PBraking。
It is similar to coil current I, electromagnetism speed limit braking moment TBrakingWith square proportional of umber of turn N.Increase
The number of turns of winding coil can effectively increase electromagnetism speed limit braking moment TBrakingWith electromagnetic braking power PBraking.Therefore, in wind-force
When electricity generation system installs electromagnetism speed limit device, select umber of turn appropriate particularly significant.
In conclusion suitable disc material and its size are selected before wind-driven generator auxiliary speed limiting system work,
The spacing in winding coil umber of turn and winding coil between iron core and brake disc is adjusted, that is, sets the resistivity of brake disc
ρ, relative permeability μr, the width a of magnetic pole strength, the length b of magnetic pole strength, the distance L of brake disc center of gravity to pole center, eddy current
Skin depth Δ h, winding coil umber of turn N, magnetic return path magnetic resistance R on the disc brake rotormEtc. parameters.Work as wind-driven generator
When assisting speed limiting system work, with the functional relation of wind speed and wind generator system armature spindle revolving speed, wind generator system rotor
Axis revolving speed exported with it functional relation, output electric energy and the functional relation of electromagnetic braking torque of electric energy, electromagnetic braking torque with
Based on the functional relation of wind generator system armature spindle revolving speed, suitable control strategy is selected, is just able to achieve this electromagnetism intelligence
Assist speed limiting system to the Control for Speed Limitation of wind generator system.
Wind-driven generator provided in an embodiment of the present invention assists speed limiting system, between wind turbine and generator setting include
The electromagnetism speed limit device of the winding coil of brake disc and ribbon core, when wind speed is excessive, by being powered by brake disc circumgyration incision
The magnetic line of force that winding coil afterwards generates, and electromagnetism speed limit braking moment is generated, so that the part wind energy of wind turbine absorption is consumed,
The revolving speed for reducing generator amature, realize wind generator system crosses wind speed defencive function.
On the basis of the above embodiments, the cabin of the generator is arranged in the brake disc and the winding coil
Outside, wherein described iron core one end with winding coil is arranged on the outer wall of the cabin, between the other end and the brake disc
There is certain gap, the gap is within a preset range.
Specifically, as shown in Fig. 2, brake disc 21 and iron core 22 with winding coil are arranged in outside the cabin of generator 2,
One end of iron core 22 with winding coil is arranged on the outer wall 25 of cabin, have between the other end and brake disc 21 it is certain between
Gap, gap within a preset range, guarantee that the iron core 22 with winding coil is not directly contacted with brake disc 21.It should be noted that
Gap between iron core 22 with winding coil and brake disc 21 can be configured according to the actual situation, and gap is different, be passed through
The magnetic flux for braking disk 21 is different, and magnetic induction intensity is different, and the eddy current of generation is also different, limits so as to cause the electromagnetism of generation
Fast braking moment is different.It can specifically be found out according to formula (6), the distance in brake disc axle center to pole center influences whether electromagnetism
The size of limiting brake torque.It therefore as needed, can be by adjusting the iron core 22 with winding coil and between brake disc 21
Gap come adjust brake disc 21 generation electromagnetism speed limit braking moment, further adjust speed limit effect.
Wind-driven generator provided in an embodiment of the present invention assists speed limiting system, during limiting brake, by the hair of absorption
Electric system power margin is consumed in brake disc in the form of fever.And since this wind-driven generator auxiliary speed limiting system will be made
Moving plate and iron core with winding coil are arranged in outside the cabin of generator, and brake disc is dissipated thermal energy by convection current and radiation
It is dealt into the environment of surrounding, without thermal energy to be dispersed into the cabin of generator, the electricity of engine block has not only been effectively relieved
Load pressure, while also reducing the temperature rise of generator.Realize the running environment for not significantly affecting former wind generator system
In the case of, the revolving speed of generator rotor shaft is reduced, realizes and wind speed defencive function is crossed to wind generator system.
On the basis of the above embodiments, the iron core with winding coil is parallel with the axis of the brake disc but does not weigh
It closes, wherein the winding direction of the axis direction of the iron core and the winding coil meets right-hand screw rule relationship.
Specifically, the iron core 22 with winding coil in the embodiment of the present invention is parallel with the axis of brake disc 21 but does not weigh
Close, i.e., both axis not point-blank so that the direction for the magnetic line of force that the iron core 22 with winding coil issues and brake disc
21 axial plane is vertical.In addition, also being maintained a certain distance between the iron core 22 with winding coil and brake disc 21.
Fig. 4 is the magnetic line of force distribution schematic diagram of winding coil in the embodiment of the present invention, as shown in figure 4, the embodiment of the present invention
The winding coil of offer after powered up, can make the magnetic flux across brake disc 21 relatively uniform, and such brake disc 21 rotates
When in it variation of magnetic flux at any point can simplify to make sinusoidal variations at any time.According to right-hand screw rule,
It will form eddy current in brake disc 21, the cutting magnetic line when brake disc 21 with eddy current rotates will receive Ampere force and generate
Electromagnetism speed limit braking moment, to play the role of speed limit.
Fig. 5 is the structural schematic diagram of intelligent control switch in the embodiment of the present invention, as shown in figure 5, in above-described embodiment
On the basis of, the intelligent control switch includes: measuring unit 51, logic unit 52 and execution unit 53, measuring unit 51 with not
It controls commutation supply voltage device 6 to connect, be sent for measuring the output voltage of uncontrollable rectifier power supply unit 6, and by the output voltage
To logic unit 52；Logic unit 52 receives the output voltage, and the output voltage and preset threshold voltage are compared,
And comparing result is sent to execution unit 53；Execution unit 53 is connect with electromagnetism speed limit device 5, described right according to what is received
Closing or opening operation is carried out than result.
Specifically, measuring unit 51 includes voltage magnitude measuring circuit, the direct current exported to uncontrollable rectifier power supply unit 6
Pressure is that output voltage carries out amplitude measurement；Logic unit 52 includes voltage magnitude contrast circuit, in advance will in logic unit 52
The output voltage setting of corresponding uncontrollable rectifier device 6 is threshold voltage when cut-out wind speed, and measuring unit 51 is measured defeated
Voltage is compared with preset threshold voltage out, and comparing result is inputted in execution unit 53；Execution unit 53 includes control
The switch that electromagnetism speed limit device 5 is powered, the closure or break that execution unit 53 is switched according to the comparing result of logic unit 52
It opens, realizes the power supply control to electromagnetism speed limit device 5.
Wind-driven generator provided in an embodiment of the present invention assists speed limiting system, measures uncontrollable rectifier by intelligent control switch
The output voltage of power supply unit, and output voltage and threshold voltage are compared, electromagnetism speed limit dress is controlled according to comparing result
The energization or power-off set realize the reasonable control to electromagnetism speed limit device, so that electromagnetism speed limit device works when crossing wind speed,
Otherwise electromagnetism speed limit device is in a dormant state.
On the basis of the above embodiments, the execution unit carries out closing or opening operation according to the comparing result,
If including: described than the result is that the output voltage is greater than or equal to the threshold voltage, the execution unit is closed
Operation；If described than the result is that the output voltage is less than the threshold voltage, the execution unit turns off operation.
Specifically, since the output voltage of uncontrollable rectifier power supply unit 6 is provided by generator, when wind speed is excessive,
The revolving speed of generator rotor shaft increases, and output power can increase accordingly, and output voltage is caused to increase.Therefore, work as logic unit
52 judge the output voltage U for the uncontrollable rectifier power supply unit 6 that measuring unit 51 measuresIt is defeatedMore than or equal to preset threshold voltage UValve
When, i.e. UIt is defeated≥UValve, logic unit 52 can export the comparing result for indicating "Yes", after execution unit 53 receives comparing result,
It will close the switch, electromagnetism speed limit device 5, which is powered, to be started, and is generated electromagnetism speed limit braking moment, is reduced the revolving speed of generator rotor shaft；
Otherwise, logic unit 52 judges the output voltage U for the uncontrollable rectifier power supply unit 6 that measuring unit 51 measuresIt is defeatedLess than threshold voltage
UValveWhen, i.e. UIt is defeated<UValve, the comparing result for indicating "No" can be exported, after execution unit 43 (53) receives comparing result, will be switched
It disconnects, 5 powered down sleep of electromagnetism speed limit device, at this moment, wind speed is in the range of wind generator system works normally.Certainly comparison knot
The specific expression meaning of fruit, can according to need and be configured, the embodiment of the present invention is not especially limited.
Wind-driven generator provided in an embodiment of the present invention assists speed limiting system, measures uncontrollable rectifier by intelligent control switch
The output voltage of power supply unit, and output voltage and threshold voltage are compared, when output voltage is greater than or equal to threshold voltage
When, indicate that wind speed is excessive, at this moment intelligent control switch is closed, and electromagnetism speed limit device is powered on；Otherwise, wind speed is being indicated just
Often, intelligent control switch disconnects, electromagnetism speed limit device powered down sleep.It realizes according to wind speed come to the reasonable of electromagnetism speed limit device
Control, so that electromagnetism speed limit device works when crossing wind speed, realize wind generator system crosses wind speed defencive function.
Lower mask body introduces the working principle of wind-driven generator auxiliary speed limiting system in the embodiment of the present invention, so as to preferably
Understand the technical solution of the embodiment of the present invention.
When wind generator system is run, it is assumed that wind speed VWindFor cut-out wind speed V1out, corresponding armature spindle rotational speed omega is critical
Rated speed ωout.When wind speed is from cut-out wind speed VWindIncrease △ VWindTo V'WindWhen, the armature spindle revolving speed of wind generator system is by critical
Rated speed ωoutIncrease to ω ', the critical normal absorption power P of wind turbineWind turbineIncrease △ PWind turbineTo P'Wind turbine, P'Wind turbineIt indicates
Cross wind speed V'Wind, the absorption power of lower wind turbine.Wherein, cross wind speed under wind turbine absorption power P 'Wind turbineSpecific formula referring to
Formula (12):
P'Wind turbine=PWind turbine+ΔPWind turbine (12)
In formula: P'Wind turbine--- cross wind speed V'WindThe absorption power of lower wind turbine；
PWind turbine--- the critical normal absorption power of wind turbine；
△PWind turbine--- wind turbine is from critical normal absorption power to the changing value for the absorption power crossed under wind speed.
Formula (11) are substituted into formula (12) and are carried out after simply changing, the additional absorbent power of available wind turbine
△PWind turbine, referring specifically to formula (13):
In formula: ω ' --- cross wind speed V'WindThe revolving speed of lower rotor part axis；
ωout--- cut-out wind speed VWindCorresponding rotor critical speed of shaft.
According to above-mentioned formula (8), (10) it is found that working as wind speed VWindIncrease △ VWindTo V'WindWhen, armature spindle rotational speed omega and wind turbine
Power P is absorbed all to increase.
If current wind speed is cut-out wind speed VWind, the critical normal absorption power P of wind turbine in systemWind turbineWith generator
Critical normal absorption power PGeneratorPower-balance relationship such as formula (14) shown in:
PWind turbine=PGenerator (14)
In formula: PGenerator--- the critical normal absorption power of generator.
When wind speed is by VWindIncrease to V'WindWhen, wind speed exceeds cut-out wind speed at this time, then V'WindTo cross wind speed, i.e. V'Wind>VWind.This
When system in wind turbine absorption power P 'Wind turbine, generator absorption power P 'GeneratorAnd the critical normal absorption function of wind turbine
Rate PWind turbine, generator critical normal absorption power PGeneratorPower-balance relationship such as formula (15) shown in:
P'Wind turbine=Δ PWind turbine+PWind turbine=P'Generator> PGenerator (15)
In formula: P'Generator--- cross wind speed V'WindUnder when being fitted without speed limit auxiliary system generator absorption power.
At this point, the absorption power P of generator 'GeneratorHigher than critical normal absorption power PGenerator, then generator is in overload
Operating status.Wind generator system needs take measures to reduce the revolving speed of armature spindle, reduce the absorption power of generator, guarantee wind
The normal operation of Force system.At this moment, electromagnetism speed limit device starts, and brake disc generates electromagnetic braking torque TBraking, brake disc can consume
The absorption power of part wind turbine, this Partial Power are electromagnetic braking power PBraking, electromagnetic braking torque TBrakingWith electromagnetic braking function
Rate PBrakingSpecific formula referring to above-mentioned formula (6) and (7).
Therefore, the wind-driven generator installed in wind generator system in the embodiment of the present invention assists speed limiting system, if wind
Speed is V'WindAnd when wind-driven generator auxiliary speed limiting system work, the absorption power of generator is P "Generator, then the power in system
Shown in equilibrium relation such as formula (16):
P'Wind turbine=Δ PWind turbine+PWind turbine=P "Generator+PBraking (16)
In formula: P "Generator--- cross wind speed V'WindUnder be mounted with wind-driven generator assist speed limiting system when generator absorption function
Rate.
Formula (14) are substituted into formula (16), the critical normal absorption power P that can obtain generator is arrangedGeneratorWith wind speed excessively
Leeward power generator assists the absorption power P of generator when speed limiting system starting "GeneratorRelationship, as shown in formula (17):
ΔPWind turbine+PGenerator=P "Generator+PBraking (17)
According to formula (17), when crossing the auxiliary speed limiting system work of wind speed leeward power generator, if electromagnetism speed limit device generates
Braking power PBrakingGreater than the power △ P of wind turbine additional absorbentWind turbine, then wind-driven generator is crossing wind speed leeward power generator
Assist absorption power P when speed limiting system starting "GeneratorLess than critical normal absorption power PGenerator, even meet formula (18) pass
System, then formula (19) is set up.Wind-driven generator is in normal operating condition at this time.
ΔPWind turbine≤PBraking (18)
PGenerator≥P″Generator (19)
△PWind turbineWith PBrakingExpression formula such as formula (13) and (7) shown in, when wind speed be V'WindWhen, armature spindle revolving speed is ω ',
Formula (13) and (7) are substituted into formula (18), formula (21) can be obtained as shown in formula (20), and by formula (20) arrangement:
The meaning of parameter is consistent with above-described embodiment in formula, and details are not described herein again.
Formula (21) is to be derived by formula (18) and obtained, therefore theoretically, installed wind-driven generator auxiliary speed limiting system additional
Wind generator system when working under any wind speed, if the rotor of the coil current of electromagnetism speed limit device and wind generator system
The relationship coincidence formula (21) of axis revolving speed, then formula (19) is set up, i.e., wind-driven generator can work normally.
By formula (6) and (21) it is found that the electric current I of the winding coil of electromagnetism speed limit device, which is not only, influences TBrakingIt is important
Variable, while being also an important factor for adjusting wind generator system power-balance, to adjust the size of winding coil electric current I, so that it may
To guarantee the normal operation of wind generator system.Fig. 6 is the function of the wind-driven generator auxiliary speed limiting system in the embodiment of the present invention
Rate balance adjustment path schematic diagram, as shown in fig. 6, the electric current I of the winding coil in the embodiment of the present invention is directly mentioned by generator
For power-balance when having installed the wind generator system work of wind-driven generator auxiliary speed limiting system additional, which adjusts path, to be indicated
It is as follows:
As wind speed VWindWhen increase, armature spindle rotational speed omega, wind turbine absorb power PWind turbinePower P is absorbed with generatorGeneratorAll
Increase；The then output power P of generatorOutputIncrease, the iron core winding coil electric current I for transferring to electromagnetism speed limit device increases；According to formula
(6) and (7), it is known that the electromagnetism speed limit braking moment T that electromagnetism speed limit device generatesBrakingWith electromagnetic braking power PBrakingAlso electric with coil
Flow the same trend growth of I；And by power-balance equation (17) it is found that PBrakingIncrease, wind turbine can be reduced to a greater degree and additionally inhaled
Receive power △ PWind turbineTo the absorption power P for crossing generator under wind speedBrakingInfluence, ensure that the normal operation of wind generator system,
Realize the speed-limiting protection to wind generator system.In addition, the wind-driven generator in the embodiment of the present invention assists speed limiting system
Workflow and wind generator system form negative-feedback, i.e. wind speed is bigger, and wind-driven generator assists the braking effect of speed limiting system
Fruit is stronger, and the electromagnetism speed limit braking moment of generation is bigger, and electromagnetic braking power is bigger, and the power that the wind turbine shared absorbs is got over
It is more, it effectively realizes speed-limiting protection function and maintains the stabilization of system.
Therefore, when crossing wind speed, if can be adjusted by default, so that the coil current that generator is exported to electromagnetism speed limit device
Relationship described in I and current rotor axis revolving speed coincidence formula (21), then the power of wind turbine additional absorbent is not under any wind speed
Wind generator system can be impacted, i.e., wind generator system can operate normally under any wind speed.Wind is installed additional at this time
Power generator assists the cut-out wind speed V of the wind generator system of speed limiting system2outGreater than the cut-out wind speed of former wind generator system
V1out, i.e. V2out>V1out, the wind speed of wind generator system is improved using the upper limit in section, increases wind energy utilization.
Wind-driven generator provided in an embodiment of the present invention assists speed limiting system, electromagnetism speed limit can fill through reasonable settings
Set structural parameters such as: the material and size of brake disc, the distance L of brake disc center of gravity to pole center and winding coil winding turns
Number N etc., may further adjust the electric current of the winding coil in electromagnetism speed limit device, may be implemented to guarantee wind-force under any wind speed
Electricity generation system can work normally.Realized wind speed leeward force generating system crosses wind speed defencive function.The embodiment of the present invention
The wind-driven generator auxiliary speed limiting system structure of offer is simple, small in size, is easily installed, is not only convenient for being mounted on newly-increased Miniature wind
On power generator, it is also convenient for the repacking of original wind-driven generator.While completion wind generator system crosses wind speed speed-limiting protection,
The cut-out wind speed for improving wind-driven generator expands wind speed using section, increases the utilization rate of wind energy.
Fig. 7 is the flow diagram that wind-driven generator assists method for limiting speed in the embodiment of the present invention, as shown in fig. 7, upper
On the basis of stating embodiment, the method for wind-driven generator auxiliary speed limit provided in an embodiment of the present invention includes:
S1, uncontrollable rectifier power supply unit obtain the part alternating current of generator, and by the AC rectification at direct current
It is sent to intelligent control switch；
Specifically, uncontrollable rectifier power supply unit is connect with the generator in wind generator system, obtains the part of generator
Alternating current simultaneously passes through bridge-type uncontrollable rectifier circuit for AC rectification into direct current, is sent to intelligent control switch.
S2, the intelligent control switch measure the output voltage of the uncontrollable rectifier power supply unit, if judging to know described
Output voltage is greater than or equal to voltage threshold, then the intelligent control switch closure；
Specifically, if wind speed is excessive, the output power of generator increases, and further results in the defeated of uncontrollable rectifier power supply unit
Voltage is greater than threshold voltage out.Intelligent control switch measures the output voltage of uncontrollable rectifier power supply unit, and by output voltage and
Preset threshold voltage is made comparisons, if judgement knows that output voltage is greater than or equal to threshold voltage, is closed, so that electromagnetism limits
Speed variator, which is powered, to be started, and is started to work.
S3, electromagnetism speed limit device are powered and generate magnetic field, further generate electromagnetism speed limit braking moment, and consumption wind turbine is inhaled
The part wind energy of receipts, reduces the revolving speed of generator rotor shaft.
Specifically, after electromagnetism speed limit device is powered, the iron core therein with winding coil can generate magnetic field, and electromagnetism speed limit
Braking disc spins in device can generate eddy current, and the magnetic line of force that the iron core of cutting belt winding coil generates, to be pacified
The effect for training power generates braking moment, and the part wind energy that consumption wind turbine absorbs reduces the revolving speed of generator rotor shaft.
Such as: when wind speed is excessive, the output power of generator increases, and the output voltage of uncontrollable rectifier power supply unit is greater than
Threshold voltage, intelligent control switch will be closed so that uncontrollable rectifier power supply unit is the power supply of electromagnetism speed limit device.Electromagnetism speed limit
After device is powered, the iron core with winding coil can generate magnetic field, generate eddy current, and cutting belt winding coil when braking disc spins
Iron core generate the magnetic line of force, thus by Ampere force effect generate braking moment, further generate electromagnetic braking power, disappear
The part wind energy that wind turbine absorbs is consumed, the revolving speed of generator rotor shaft is reduced.
The method of wind-driven generator auxiliary speed limit provided in an embodiment of the present invention, by installing wind in wind generator system
Power generator assists speed limiting system, when crossing wind speed, generates braking moment by electromagnetism speed limit device and consumes what wind turbine absorbed
Part wind energy, and the revolving speed of generator rotor shaft is reduced, realize wind generator system crosses wind speed defencive function.
On the basis of the above embodiments, the method also includes: if intelligent control switch judgement know uncontrollable rectifier supply
The output voltage of electric installation is less than voltage threshold, then the intelligent control switch disconnects, and the electromagnetism speed limit device is in suspend mode
State.
Specifically, intelligent control switch measures and judges that the output voltage of uncontrollable rectifier power supply unit is less than preset voltage
When threshold values, wind speed is indicated in wind generator system normal range of operation, and at this moment electromagnetism speed limit device does not need work, and intelligence is controlled
System switch disconnect so that electromagnetism speed limit device power-off and in a dormant state, without work.
The method of wind-driven generator auxiliary speed limit provided by the invention, working principle one of the working principle with above system
It causes, details are not described herein again.
The method of wind-driven generator auxiliary speed limit provided in an embodiment of the present invention, when wind generator system was in wind speed fortune
When row, the output voltage of generator rises, when the voltage magnitude of uncontrollable rectifier power supply unit output rises and is more than threshold voltage,
Intelligent control switch closure, winding coil are powered and generate magnetic flux；Magnetic flux passes through winding coil core magnetic pole, air gap and system
Closed magnetic circuit is formed after Moving plate；The brake disc cutting magnetic induction line of rotation generates electromagnetism speed limit braking moment, consumes part wind
Can, allow the armature spindle revolving speed of wind turbine and generator to be in normal range (NR), so that wind generator system is in a degree of mistake
It remains to work normally under wind speed, both protects wind generator system, also improve the wind speed of wind generator system using on section
Limit increases wind power system generated energy, increases wind energy utilization.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (7)
1. a kind of small-sized fixed pitch wind-driven generator assists speed limiting system characterized by comprising electromagnetism speed limit device is not controlled
Commutation supply voltage device and intelligent control switch, the electromagnetism speed limit device are arranged between wind turbine and generator, pass through production
Electromagnetism speed limit braking moment is given birth to reduce the revolving speed of the generator rotor shaft；The uncontrollable rectifier power supply unit and the power generation
The part alternating current of the generator is rectified into direct current, and is the electromagnetism by the intelligent control switch by machine connection
Speed-limiting device power supply；
The intelligent control switch includes: measuring unit, logic unit and execution unit, the measuring unit with it is described do not control it is whole
Power supply unit connection is flowed, is sent to for measuring the output voltage of the uncontrollable rectifier power supply unit, and by the output voltage
The logic unit；
The logic unit receives the output voltage, the output voltage and preset threshold voltage is compared, and will be right
The execution unit is sent to than result；
The execution unit is connect with the electromagnetism speed limit device, carries out closing or opening according to the comparing result received
Operation.
2. system according to claim 1, which is characterized in that the electromagnetism speed limit device includes: brake disc and with winding
The iron core of coil, the brake disc is arranged between the wind turbine and the generator, with the wind turbine and the hair
Motor coaxle rotation；
The winding coil is connect with the intelligent control switch, and between the iron core with winding coil and the brake disc
Distance be not less than pre-determined distance so that can be cut after the braking disc spins after the iron core with winding coil is powered
The magnetic line of force of generation and generate electromagnetism speed limit braking moment.
3. system according to claim 2, which is characterized in that the brake disc and the iron core setting with winding coil
Outside the cabin of the generator, wherein described iron core one end with winding coil is arranged on the outer wall of the cabin, it is another
There is certain gap between end and the brake disc, the gap is within a preset range.
4. system according to claim 2 or 3, which is characterized in that the iron core with winding coil and the brake disc
Axis it is parallel but be not overlapped, wherein the winding direction of the axis direction of the iron core and the winding coil meets right-handed helix
Rule relationship.
5. system according to claim 1, which is characterized in that the execution unit is closed according to the comparing result
Or opening operation, comprising: if it is described than the result is that the output voltage be greater than or equal to the threshold voltage, it is described to execute list
Member carries out closed procedure；
If described than the result is that the output voltage is less than the threshold voltage, the execution unit turns off operation.
6. a kind of application small-sized fixed pitch wind-driven generator auxiliary speed limiting system as claimed in claim 1 to 5 carries out wind
The method of power generator auxiliary speed limit characterized by comprising
Uncontrollable rectifier power supply unit obtains the part alternating current of generator, and the AC rectification is sent to intelligence at direct current
It can control switch；
The intelligent control switch measures the output voltage of the uncontrollable rectifier power supply unit, if the output voltage is known in judgement
More than or equal to voltage threshold, then the intelligent control switch is closed；
Electromagnetism speed limit device is powered and generates magnetic field, further generates electromagnetism speed limit braking moment, the portion that consumption wind turbine absorbs
Divide wind energy, reduces the revolving speed of generator rotor shaft.
7. according to the method described in claim 6, it is characterized in that, the method also includes: if intelligent control switch judgement obtain
Know that the output voltage of uncontrollable rectifier power supply unit is less than voltage threshold, then the intelligent control switch disconnects, the electromagnetism speed limit
Device is in a dormant state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611041674.1A CN106788017B (en) | 2016-11-11 | 2016-11-11 | A kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611041674.1A CN106788017B (en) | 2016-11-11 | 2016-11-11 | A kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106788017A CN106788017A (en) | 2017-05-31 |
| CN106788017B true CN106788017B (en) | 2019-05-17 |
Family
ID=58973966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611041674.1A Active CN106788017B (en) | 2016-11-11 | 2016-11-11 | A kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106788017B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108391887A (en) * | 2018-02-07 | 2018-08-14 | 深圳市晓控通信科技有限公司 | A kind of intelligent helmet with navigation and automatic charging function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469668A (en) * | 2007-12-25 | 2009-07-01 | 上海万德风力发电股份有限公司 | Small power electromagnetic deceleration pressure-limiting wind and solar energy mutual-complementing power generation system |
| CN203670109U (en) * | 2013-11-12 | 2014-06-25 | 中科恒源科技股份有限公司 | Brake system of wind driven generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9413217B2 (en) * | 2012-06-28 | 2016-08-09 | General Electric Company | Electromagnetic braking systems and methods |
-
2016
- 2016-11-11 CN CN201611041674.1A patent/CN106788017B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469668A (en) * | 2007-12-25 | 2009-07-01 | 上海万德风力发电股份有限公司 | Small power electromagnetic deceleration pressure-limiting wind and solar energy mutual-complementing power generation system |
| CN203670109U (en) * | 2013-11-12 | 2014-06-25 | 中科恒源科技股份有限公司 | Brake system of wind driven generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106788017A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8053917B2 (en) | Variable-speed power generator and method of controlling the same | |
| ES2411355T5 (en) | Restriction of power of wind turbines | |
| CN104169531B (en) | The flame-out method operating turbogenerator afterwards | |
| CN102011702A (en) | Method and mechanism for controlling propeller pitch angle of vertical-axis wind turbine with magnetic force and wind power | |
| CN101469668B (en) | Small power electromagnetic deceleration pressure-limiting wind and solar energy mutual-complementing power generation system | |
| CN109306934A (en) | Low wind speed double-motor type magnetic suspension vertical shaft Wind turbines and its control method | |
| WO2008119994A2 (en) | Improvements in or relating to wind turbines | |
| EP2706229B1 (en) | Turbine and control system of the over-power of said turbine | |
| CN106788017B (en) | A kind of small-sized fixed pitch wind-driven generator auxiliary speed limiting system and method | |
| CN104676777B (en) | Air-conditioner outdoor unit | |
| CN108425804A (en) | A kind of low wind speed vertical axis wind power generator and its control method | |
| CN201129270Y (en) | Electromagnetic reduced speed pressure-limiting type 600 w wind and light complementary power generation system | |
| CN109245662B (en) | VF control method of variable pitch motor | |
| CN102352815A (en) | Wind generating set | |
| CN209053738U (en) | Low wind speed double-motor type magnetic suspension vertical shaft Wind turbines | |
| CN202203047U (en) | Electromagnetic brake device of wind power generator | |
| CN108667366B (en) | Self-closed electromagnetic coupling speed regulation wind turbine generator control method adopting active power priority mode | |
| CN106440544A (en) | Wind-driven air conditioner applicable to various wind speeds | |
| TW201223130A (en) | Fluid power generating apparatus and method for controlling the same | |
| CN105257460B (en) | Modularization misphase installs multiphase fault-tolerant structure ocean current power generation unit | |
| CN209389800U (en) | A kind of DC brushless electric motor | |
| CN209053739U (en) | Low wind speed high-power magnetic-suspension vertical axis wind electric unit | |
| CN204349759U (en) | The self-excitation type liquid cooling current vortex retarder of a kind of pair of water channel structure | |
| CN204493082U (en) | A kind of wind-power electricity generation configuration-system | |
| CN104088755B (en) | Vertical axis aerogenerator relief arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |