CN104600930B - Permanent magnet excitation brushless dual-feedback wind power generator - Google Patents
Permanent magnet excitation brushless dual-feedback wind power generator Download PDFInfo
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- CN104600930B CN104600930B CN201510010050.2A CN201510010050A CN104600930B CN 104600930 B CN104600930 B CN 104600930B CN 201510010050 A CN201510010050 A CN 201510010050A CN 104600930 B CN104600930 B CN 104600930B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Wind Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of permanent magnet excitation brushless dual-feedback wind power generator, it includes stator (1), outer rotor (2), internal rotor (3) and rotating shaft (6), and the stator (1) and internal rotor (3) are separately positioned on periphery and the inner circumferential of the outer rotor (2)；The internal rotor (3) is coaxial with outer rotor (2) and is freely rotatable；The different independent winding of two sets of numbers of pole-pairs is provided with the stator (1), wherein p is directly connected to the power winding (8) of pole with power network, and q is connected through AC-DC-AC power converter to the controling winding (9) of pole with power network；The outer rotor (2) is the adjustable magnetic rotor equipped with (p+q) block magnetic inductive block, internal rotor (3) is the q equipped with permanent magnet (7) to pole permanent magnet rotor, and the permanent magnetic field produced by the permanent magnet (7) is acted on by the magnetic field modulation of rotor (2) and produces p to be respectively power winding (8) and controling winding (9) offer excitation field to the magnetic field of pole to pole and q.The present invention uses permanent magnet excitation, and the power density that improve double-fed wind power generator advantageously reduces the cost of wind power system.
Description
Technical field
It is brushless the present invention relates to field of wind power equipment, more particularly to a kind of permanent magnet excitation that can realize variable speed constant frequency
Double-fed wind power generator.
Background technology
Wind energy is a kind of clean regenerative resource.Greatly develop including the renewable energy power generation skill including wind-power electricity generation
Art is to solve global energy and the nervous optimal selection of resource.Wind power generating set typically uses synchronization or influence generator, and
The output frequency of the wind power generating set requirement generator of net type is consistent with mains frequency, because traditional synchronization or sensing generate electricity
Machine can not realize that variable speed constant frequency runs, and the utilization rate of wind energy is than relatively low.Thus the variable speed constant frequency wind-force of disadvantages mentioned above can be overcome to send out
Motor quickly grows in recent years, mainly there is dual-feed asynchronous wind power generator and direct-driving permanent magnetic synchro wind generator at present.Its
Middle double-fed asynchronous generator is operated in a limited range of speeds, and rotor-side power inverter need to only provide slip power,
About the 20%~30% of generator rating power, reduces cost.But the shortcoming of this generator is also quite obvious：Due to depositing
In main winding and Exciting Windings for Transverse Differential Protection, the volume with capacity electrical machinery is larger, and efficiency is relatively low；The number of pole-pairs of generator receives volumetric constraint not
Can be excessive, have to use step-up gear between blower fan and generator, increased the mechanical loss of unit, noise pollution and dimension
Shield workload；There is Exciting Windings for Transverse Differential Protection on rotor, it is necessary to slip ring and brush, reduce reliability, increased maintenance workload.It is straight to drive
Type magneto alternator eliminates step-up gear, and rotor, without slip ring and brush, improves reliability without winding, reduces
Maintenance load, efficiency high, but volume and weight is huge, it is necessary to the work(of total power in itself direct-driving permanent magnetic synchronous generator
Rate converter, high cost.
In recent years, magnetic gear technique quickly grows, and occurs in that a kind of magnetic gear external rotor permanent magnet brushless wind generator, can
To substantially reduce the number of pole-pairs of permagnetic synchronous motor, reduce the volume of generator, but also increase the structure complexity of generator,
And total power converter is needed also exist for, cost is very high.The permanent magnet utilization rate of magnetic gear is low, increased the consumption of permanent-magnet material,
Further increase cost.
The content of the invention
Technical problem：It is an object of the invention to the drawbacks described above for overcoming prior art to exist, a kind of variable speed constant frequency is proposed
Permanent magnet excitation brushless dual-feed motor, the motor improves efficiency and reliability without gear-box and brush, using magnetic gear
Main field realizes control function, improves the utilization rate of permanent magnet, and power density is high, using the changed power device of Partial Power,
Cost is reduced, generator is run in internal speed-changing constant frequency in a big way.
Technical scheme：A kind of permanent magnet excitation brushless dual-feedback wind power generator of the invention includes stator, outer rotor, internal rotor
And rotating shaft, the stator and internal rotor are separately positioned on periphery and the inner circumferential of the outer rotor；The two ends of the outer rotor are provided with
Rotor endcap, the outer rotor is connected by the rotor endcap at its two ends with the rotating shaft, and inner rotor shaft is fixed with the rotating shaft
Hold, the internal rotor is connected by the inner rotor bearing with rotating shaft, the internal rotor is coaxial with outer rotor and is freely rotatable；Institute
Stator is stated there is provided two sets of independent windings, i.e. power winding and controling winding；The outer rotor is the adjustable magnetic equipped with magnetic inductive block
Rotor；The internal rotor is the permanent magnet rotor equipped with permanent magnet；
Be provided with the different independent winding of two sets of numbers of pole-pairs on the stator, wherein p to the power winding of pole directly with electricity
Net be connected, q is connected through AC-DC-AC power converter to the controling winding of pole with power network, both magnetic field do not exist directly with indirectly
Coupling, the p and q is respectively positive integer, and p and q are unequal.
The number of magnetic inductive block is p+q on the outer rotor, is uniformly distributed in a circumferential direction, is filled in the space of magnetic inductive block
Non-magnetic epoxide resin material；Outer rotor is directly connected by rotating shaft with wind energy conversion system, eliminates machinery speed increasing gear-box；Its turn
Speed produces the rotating speed in magnetic field to together decide on by the rotating speed of internal rotor with power winding.
The number of pole-pairs of permanent magnet and the number of pole-pairs of controling winding are identical on described internal rotor, rotating speed and the control of internal rotor
Winding produces the rotating speed in magnetic field identical.
The rotating speed of the outer rotor is determined by the frequency of supply of controling winding, by changing the frequency of supply of controling winding,
It is capable of achieving the MPPT maximum power point tracking of wind energy conversion system.
The capacity of the AC-DC-AC power converter for generator capacity a part and with generator variable-speed operation scope
Relevant, the power is the higher value in following two power：AC-DC-AC power inverter power=generator capacity × (specified speed
Degree-minimum operation speed) ÷ normal speeds；AC-DC-AC power inverter power=generator capacity × (highest running speed-
Normal speed) ÷ normal speeds.
Beneficial effect：
1st, magnetic gear is increased, machinery speed increasing gear-box is eliminated, reliability is improve, maintenance workload is reduced, is carried
High torque density and power density.
2nd, magnetic gear motor has only used the harmonic field of permanent magnet, adds controling winding to take full advantage of the master of permanent magnet
Magnetic field, improves the utilization rate of permanent magnet.
3rd, permanent magnet excitation brushless dual-feedback wind power generator power winding and power network are directly connected to, and AC-DC-AC power converter connects
Controling winding is connected to provide control electric current, permanent magnet can be made to be maintained at synchronous rotational speed for the excitation field that power winding is provided,
Realize that constant frequency is run.Depending on the capacity of AC-DC-AC power converter is according to the speed adjustable range of generator, typically there was only generator volume
The 20%~30% of constant volume, relative to magneto alternator, magnetic gear external rotor permanent magnet brushless wind generator, this generating
Machine advantageously reduces cost without using being equal to the power inverter of electricity generation system rated capacity.
4th, outer rotor is adjustable magnetic rotor, and internal rotor is p-m rotor, and winding, slip ring and brush are not needed, is improve
Reliability, reduces maintenance workload.
Brief description of the drawings
The view in transverse section of Fig. 1 permanent magnet excitation brushless dual-feedback wind power generators of the present invention；
Fig. 2 is the longitudinal sectional view of permanent magnet excitation brushless dual-feedback wind power generator of the present invention；
Fig. 3 is the grid-connected schematic diagram of permanent magnet excitation brushless dual-feedback wind power generator of the present invention；
Fig. 4 is the power transmission schematic diagram of permanent magnet excitation brushless dual-feedback wind power generator of the present invention.
Have in figure：Stator 1, outer rotor 2, internal rotor 3, rotor endcap 4, inner rotor bearing 5, rotating shaft 6, permanent magnet 7, power
Winding 8, controling winding 9, stator bearing 10, magnetic inductive block 11, wind energy conversion system 12, AC-DC-AC power converter 13.
Specific embodiment
Permanent magnet excitation brushless dual-feedback wind power generator of the invention, including stator, outer rotor, internal rotor and rotating shaft, it is described
Stator and internal rotor are separately positioned on periphery and the inner circumferential of the outer rotor；The two ends of the outer rotor are provided with rotor endcap, should
Outer rotor is connected by the rotor endcap at its two ends with the rotating shaft, is fixed with inner rotor bearing in the rotating shaft, the internal rotor
It is connected with rotating shaft by the inner rotor bearing, the internal rotor is coaxial with outer rotor and is freely rotatable；Set on the stator
Put two sets of independent windings --- power winding and controling winding, it is respectively used to generate electricity and rotating speed control；The internal rotor is
Permanent magnet rotor equipped with permanent magnet；The outer rotor is the adjustable magnetic rotor for being provided with magnetic inductive block, for modulating internal rotor
Permanent magnetic field, two kinds of excitation fields needed for producing power winding and controling winding, and be directly connected by rotating shaft with wind energy conversion system.
According to the one side of permanent magnet excitation brushless dual-feedback wind power generator of the present invention：The stator is provided with two sets
Independent winding --- power winding and controling winding, both numbers of pole-pairs are different, therefore without direct-coupling；Turn in being respectively adopted
Used as excitation field, both do not exist INDIRECT COUPLING to two magnetic fields after sub- permanent magnetic field modulation.The permanent magnet excitation brushless double feed
Wind-driven generator can regard the cascade of a magnetic gear power generation machine and a permanent magnet synchronous motors as, only exist mechanical connection, no
In the presence of the coupling of electricity and magnetic.
According to the one side of permanent magnet excitation double-fed wind power generator of the present invention：The outer rotor is equipped with magnetic conduction
The adjustable magnetic ring of block, the permanent magnetic field for modulating internal rotor, with the excitation field for producing power winding to be needed with controling winding；Lead
The number of magnetic patch is power winding and controling winding number of pole-pairs sum；Outer rotor is joined directly together with wind energy conversion system, turns by the way that control is outer
The rotating speed of son, realizes the MPPT maximum power point tracking of wind energy conversion system.
According to the one side of permanent magnet excitation double-fed wind power generator of the present invention：Permanent magnetism is housed on the internal rotor
Body, the number of pole-pairs of permanent magnet is identical with controling winding number of pole-pairs；The rotating speed of internal rotor produces the rotating speed phase in magnetic field with controling winding
Together, i.e., the controlled control around class frequency.
According to the one side of permanent magnet excitation double-fed wind power generator of the present invention：The rotating speed of the outer rotor, i.e.,
The controlled control around class frequency of rotating speed of wind energy conversion system, and it is relevant with the number of pole-pairs of power winding and controling winding.
According to the one side of permanent magnet excitation double-fed wind power generator of the present invention：The controling winding is straight by handing over
Hand over power inverter to be connected with power network, the capacity of power inverter be a part for generator capacity and with generator variable-speed operation
Scope is relevant, and the power is the higher value in following two power：AC-DC-AC power inverter power=generator capacity × (volume
Constant speed degree-minimum operation speed) ÷ normal speeds；AC-DC-AC power inverter power=generator capacity × (highest operation speed
Degree-normal speed) ÷ normal speeds.
The present invention will be further described below in conjunction with the accompanying drawings, it should be understood that these implementation methods be merely to illustrate the present invention and
Limitation the scope of the present invention is not used in, after reading this disclosure, those skilled in the art is to various shapes of equal value of the invention
The modification of formula falls within claims hereof limited range.
The structure of permanent magnet excitation brushless dual-feedback wind power generator of the present invention is described with reference to Fig. 1 to Fig. 2.From the horizontal stroke of the generator
To be made up of four parts to can be seen that generator main in sectional view, longitudinal sectional drawing：Stator 1, outer rotor 2, the and of internal rotor 3
Rotating shaft 6.Two sets of independent windings are wherein provided with stator 1：P is to the power winding and q of pole to the controling winding of pole, the p
Positive integer is respectively with q, and p and q are unequal.It is individual in the equally distributed magnetic inductive block of circumferencial direction equipped with (p+q) on outer rotor 2
11, non-magnetic epoxide resin material is filled in the space between magnetic inductive block, outer rotor 2 is consolidated by the rotor endcap 4 at its two ends
Due in rotating shaft 6 and can rotating therewith.Permanent magnet 7 is housed, the number of pole-pairs of permanent magnet is q on internal rotor 3.
Fig. 3 show permanent magnet excitation brushless dual-feedback wind power generator grid-connected system, and rotating shaft 6 is directly taken turns with wind energy conversion system 12
Hub is connected, and outer rotor 2 is fixed in rotating shaft 6, for transmitting power and energy from wind energy conversion system.Internal rotor is installed through bearing 5
In rotating shaft 6, permanent magnet 7 is housed in internal rotor 3, is that power winding 8 and controling winding 9 provide excitation field.By outer rotor 2
The reasonable arrangement of the quantity of magnetic patch 11 and the quantity of permanent magnet 7 on internal rotor 3 is raised, the decoupling in double winding magnetic field on stator 1 is realized.
The rotating speed n of permanent magnet excitation brushless dual-feedback wind power generator outer rotor of the present inventionLIn power winding and controling winding
The frequency f of electric currentpAnd fcMeet relation：nL=60 (fp±fc)/(p+q).Due to mains frequency fpIt is fixed, in regulation controling winding
The frequency of electric current, so that it may realize the speed constant pressure constant frequency generation of the generator.And changed by controlling AC-DC-AC power converter
Become frequency, size and the phase of electric current in controling winding, active and reactive power flexible modulation can also be realized.
Fig. 4 show permanent magnet excitation brushless dual-feedback wind power generator power transmission schematic diagram, the T in figurepIt is power winding
Braking moment of the magnetic field to outer rotor；TcIt is controling winding magnetic field to the braking moment of outer rotor；TprFor power winding turns through outer
Torques of the magnetic field to internal rotor are modulated after sub- modulating action；TcrIt is controling winding through the modulation after outer rotor modulating action
Torques of the magnetic field to internal rotor；TLThe input torque of outer rotor is delivered to for wind energy conversion system；ωLIt is the anglec of rotation speed of outer rotor
Degree, the i.e. angular velocity of rotation of wind energy conversion system；ωpThe angular velocity of rotation in magnetic field is produced for power winding；ωrFor controling winding produces magnetic
The angular velocity of rotation of field, the i.e. stable angular velocity of rotation of internal rotor.Wind energy conversion system 12 passes to the machinery of outer rotor 2 via rotating shaft 6
Power is PL=TLωL, the power that power winding is transported to power network is PP=Tpωp, the power that controling winding is transported to power network is
Pc=Tcωr。
Permanent magnet excitation double-fed wind power generator of the invention is substantially magnetic gear power generation machines of the p to pole stator winding
Cascade with a q to the permagnetic synchronous motor of pole stator winding, two motors are mechanically connected by p-m rotor, Tc=Tcr=
Tpr, the magnetic field of controling winding does not produce directly influence to the rotating speed of outer rotor.With reference to the operation principle of magnetic gear, the generator
Operation principle it is as follows：Wind energy is converted into mechanical energy by wind energy conversion system, and outer rotor is passed to by rotating shaft so that the outer rotor anglec of rotation
Speed is ωL, only controling winding power frequency need to be adjusted by AC-DC-AC power converter so that control magnetic field rotating angular speed
ωrMeet：(ωp-ωL)/(ωr-ωL)=- q/p, then permanent magnetism modulation magnetic field induced on power winding and mains frequency phase
Deng back-emf, after being connected to the grid generator i.e. be capable of achieving variable speed constant frequency generator.
Permanent magnet excitation double-fed wind power generator of the invention defines the logical direct current (f of controling windingc=0) when outer rotor
Rotating speed is synchronous rotational speed ωL0, when wind speed is very fast, ωL>ωL0When, the phase sequence of controling winding is identical with power winding, now controls
Winding power output；When wind speed is slower, ωL<ωL0When, the phase sequence of controling winding is identical with power winding, and now controling winding is defeated
Enter power；Work as ωL=ωL0When, fc=0, now controling winding be passed through direct current, the energy that controling winding is provided is only used for copper loss
And iron loss.
Permanent magnet excitation double-fed wind power generator of the invention defines revolutional slip：S=(ωL-ωL0)/ωL0=fc/fp, control
The relation of the power that the power that winding processed is transported to power network is transported to power network with power winding is：Pc=sPP.Then supersynchronous operation
When, s is transported to power network for just, the mechanical output of wind energy conversion system is most of by power winding, and fraction is by controling winding through work(
Rate converter is sent to power network；When metasynchronism is run, s is negative, and controling winding absorbs electric energy by power inverter from power network, is absorbed
Electrical power power winding is delivered to together with the mechanical output of wind energy conversion system, be conveyed to power network.Permanent magnet excitation double-fed wind generating
The efficiency of machine is η, and the energy transmission relation between the mechanical energy and power network of wind energy conversion system input is PL=η (PP+Pc)=η (1+s)
PP。
Claims (3)
1. a kind of permanent magnet excitation brushless dual-feedback wind power generator, it is characterised in that：The wind-driven generator includes stator (1), turns outward
Sub (2), internal rotor (3) and rotating shaft (6), the stator (1) and internal rotor (3) are separately positioned on the periphery of the outer rotor (2)
And inner circumferential；The two ends of the outer rotor (2) are provided with rotor endcap (4), the rotor endcap (4) that the outer rotor (2) passes through its two ends
It is connected with the rotating shaft (6), inner rotor bearing (5) is fixed with the rotating shaft (6), the internal rotor (3) is by the internal rotor
Bearing (5) is connected with rotating shaft (6), and the internal rotor (3) is coaxial with outer rotor (2) and is freely rotatable；The stator (1) is set
Two sets of independent windings, i.e. power winding (8) and controling winding (9)；The outer rotor (2) is the tune equipped with magnetic inductive block (11)
Magnet ring rotor；The internal rotor (3) is the permanent magnet rotor equipped with permanent magnet (7)；
Be provided with the different independent winding of two sets of numbers of pole-pairs on the stator (1), wherein p to the power winding (8) of pole directly with
Power network is connected, and q is connected through AC-DC-AC power converter (13) to the controling winding (9) of pole with power network, and both magnetic field does not exist
Directly and INDIRECT COUPLING, the p and q is respectively positive integer, and p and q are unequal；
The number of magnetic inductive block (11) is p+q on the outer rotor (2), is uniformly distributed in a circumferential direction, in the space of magnetic inductive block
The non-magnetic epoxide resin material of filling；Outer rotor (2) is directly connected by rotating shaft (6) with wind energy conversion system (12), eliminates machinery
Step-up gear；Its rotating speed produces the rotating speed in magnetic field to together decide on by the rotating speed of internal rotor (3) with power winding (8)；
The number of pole-pairs of permanent magnet is identical with the number of pole-pairs of controling winding (9) on described internal rotor (3), the rotating speed of internal rotor (3)
It is identical with the rotating speed that controling winding (9) produces magnetic field.
2. permanent magnet excitation brushless dual-feedback wind power generator according to claim 1, it is characterised in that the outer rotor (2)
Rotating speed is determined by the frequency of supply of controling winding (9), by changing the frequency of supply of controling winding (9), is capable of achieving wind energy conversion system
MPPT maximum power point tracking.
3. permanent magnet excitation brushless dual-feedback wind power generator according to claim 1, it is characterised in that：The AC-DC-AC power
The capacity of converter (13) is the part of generator capacity and relevant with generator variable-speed operation scope, and the power is following two
Higher value in individual power：AC-DC-AC power inverter power=generator capacity × (normal speed-minimum operation speed) ÷
Normal speed；AC-DC-AC power inverter power=generator capacity × (highest running speed-normal speed) specified speed of ÷
Degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510010050.2A CN104600930B (en) | 2015-01-08 | 2015-01-08 | Permanent magnet excitation brushless dual-feedback wind power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510010050.2A CN104600930B (en) | 2015-01-08 | 2015-01-08 | Permanent magnet excitation brushless dual-feedback wind power generator |
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| CN104600930A CN104600930A (en) | 2015-05-06 |
| CN104600930B true CN104600930B (en) | 2017-06-16 |
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| CN106451963A (en) * | 2015-08-06 | 2017-02-22 | 香港理工大学 | Magnetic field modulation type motor and electric control continuously variable transmission |
| CN106374704B (en) * | 2016-09-09 | 2019-05-10 | 华中科技大学 | A kind of brushless dual-mechanical port magneto based on magnetic field modulation principle |
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| CN106505814B (en) * | 2016-10-31 | 2019-03-05 | 东南大学 | A kind of modulation birotor brushless dual-feedback wind power generator |
| CN106487179A (en) * | 2016-11-07 | 2017-03-08 | 东南大学 | Dual-stator brushless double-fed wind power generator is modulated in a kind of field |
| CN106655671B (en) * | 2016-12-12 | 2019-07-19 | 华中科技大学 | A kind of brushless dual electricity port magneto of high torque density and its application |
| GB2558660A (en) * | 2017-01-16 | 2018-07-18 | Magnomatics Ltd | An electrical machine and a method of operating an electrical machine |
| CN106685182A (en) * | 2017-01-20 | 2017-05-17 | 哈尔滨工业大学 | Intermediate adjustable flux radial integrated electrical continuously-variable transmission |
| CN106921281A (en) * | 2017-03-14 | 2017-07-04 | 广西东典科技有限公司 | Continuous power generator |
| CN109586340B (en) * | 2018-12-10 | 2022-11-18 | 国电联合动力技术有限公司 | Low wind speed power flow direction verification method and device of wind power system and storage medium |
| CN110017250B (en) * | 2019-03-29 | 2020-12-08 | 华中科技大学 | Variable-speed constant-frequency wind power generation system |
| JP7493340B2 (en) * | 2020-01-17 | 2024-05-31 | 三菱重工業株式会社 | Electric vehicles |
| CN111371274B (en) * | 2020-03-30 | 2021-09-28 | 东南大学 | Wide speed regulation type magnetic field modulation double-fed motor |
| CN112003437B (en) * | 2020-09-08 | 2022-03-18 | 齐鲁工业大学 | Composite structure wind driven generator and power generation system |
| WO2023123639A1 (en) * | 2021-12-29 | 2023-07-06 | 大富科技(安徽)股份有限公司 | Motor structure, hub motor and vehicle |
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