CN104600930A - Permanent magnet excitation brushless doubly fed wind power generator - Google Patents
Permanent magnet excitation brushless doubly fed wind power generator Download PDFInfo
- Publication number
- CN104600930A CN104600930A CN201510010050.2A CN201510010050A CN104600930A CN 104600930 A CN104600930 A CN 104600930A CN 201510010050 A CN201510010050 A CN 201510010050A CN 104600930 A CN104600930 A CN 104600930A
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- rotor
- permanent magnet
- power
- winding
- generator
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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
Abstract
The invention discloses a permanent magnet excitation brushless doubly fed wind power generator. The permanent magnet excitation brushless doubly fed wind power generator comprises a stator (1), an outer rotor (2), an inner rotor (3) and a rotation shaft (6), wherein the stator (1) and the inner rotor (3) are respectively arranged on the periphery and the inner circumference of the outer rotor (2), the inner rotor (3) and the outer rotor (2) are coaxial and can freely rotate, two independent windings different in pole pair number are arranged on the stator (1), a power winding (8) of p pairs of poles is directly connected with a power grid, a control winding (9) of q pairs of poles is connected with the power grid through a direct and alternating power exchanger, the outer rotor (2) is a magnet ring regulation rotor with (p+q) magnetic conductive blocks, the inner rotor (3) is a q pair pole permanent magnet type rotor with a permanent magnet (7), and a permanent magnet field generated by the permanent magnet (7) generates magnet fields of the p pairs of the poles and the q pairs of the poles through magnet field modulating action of the outer rotor (2), and thereby provides excitation magnet fields respectively to the power winding (8) and the control winding (9). The permanent magnet excitation brushless doubly fed wind power generator uses permanent magnet excitation, increases the power density of an existing doubly fed wind power generator, and facilitates cost reduction of a wind power system.
Description
Technical field
The present invention relates to field of wind power equipment, particularly relate to a kind of permanent magnet excitation brushless dual-feedback wind power generator that can realize variable speed constant frequency.
Background technology
Wind energy is a kind of regenerative resource of cleaning.Greatly developing the renewable energy power generation technology comprising wind power generation is the optimal selection solving global energy and resource anxiety.Wind turbine generator generally adopts synchronous or induction generator, and the wind turbine generator of grid type requires that the output frequency of generator is consistent with mains frequency, and run because traditional synchronous or induction generator can not realize variable speed constant frequency, the utilance of wind energy is lower.The speed-variable frequency-constant wind-driven generator development in recent years that thus can overcome above-mentioned shortcoming is rapid, mainly contains dual-feed asynchronous wind power generator and direct-driving permanent magnetic synchro wind generator at present.Wherein double-fed asynchronous generator is operated in a limited range of speeds, and rotor-side power inverter only need provide slip power, is about 20% ~ 30% of generator rating power, reduces cost.But the shortcoming of this generator is also quite obvious: owing to there is main winding and excitation winding, the volume with capacity electrical machinery is comparatively large, and efficiency is also lower; The number of pole-pairs of generator can not be too much by volume restriction, must use step-up gear, add the mechanical loss of unit, noise pollution and maintenance workload between blower fan and generator; There is excitation winding in rotor, need slip ring and brush, reduce reliability, add maintenance workload.Direct-driving permanent magnetic synchronous generator eliminates step-up gear, rotor without winding, without the need to slip ring and brush, improve reliability, decrease maintenance load, efficiency is high, but the volume and weight of direct-driving permanent magnetic synchronous generator own is huge, need flat-out power inverter, cost is high.
In recent years, rapidly, there is a kind of magnetic gear external rotor permanent magnet brushless wind generator in the development of magnetic gear technique, greatly can reduce the number of pole-pairs of permagnetic synchronous motor, reduce the volume of generator, but too increase the structure complexity of generator, and needing total power converter equally, cost is very high.The permanent magnet utilance of magnetic gear is low, adds the consumption of permanent magnetic material, further increases cost.
Summary of the invention
Technical problem: the object of the invention is to the above-mentioned defect overcoming prior art existence, a kind of permanent magnet excitation brushless dual-feed motor of variable speed constant frequency is proposed, this motor is without the need to gear box and brush, improve efficiency and reliability, utilize the main field of magnetic gear to realize controlling functions, improve the utilance of permanent magnet, power density is high, use the changed power device of Partial Power, reduce cost, make generator in internal speed-changing constant frequency operation in a big way.
Technical scheme: a kind of permanent magnet excitation brushless dual-feedback wind power generator of the present invention comprises stator, external rotor, internal rotor and rotating shaft, and described stator and internal rotor are separately positioned on periphery and the inner circumferential of described external rotor; The two ends of described external rotor are provided with rotor endcap, this external rotor is connected with described rotating shaft by the rotor endcap at its two ends, described rotating shaft is fixed with inner rotor bearing, and this internal rotor is connected with rotating shaft by described inner rotor bearing, and described internal rotor also can rotate freely with external rotor is coaxial; Described stator is provided with two and overlaps independently winding, i.e. power winding and controlled winding; Described external rotor is the adjustable magnetic rotor that magnetic inductive block is housed; Described internal rotor is the permanent magnet rotor that permanent magnet is housed;
Described stator is provided with the independent winding that two cover numbers of pole-pairs are different, wherein the power winding of p to pole is directly connected with electrical network, q is connected with electrical network through AC-DC-AC power converter to the controlled winding of pole, both magnetic field does not exist directly and indirect coupling, described p and q is respectively positive integer, and p and q is unequal.
On described external rotor, the number of magnetic inductive block is p+q, is uniformly distributed in a circumferential direction, fills non-magnetic epoxide resin material in the space of magnetic inductive block; External rotor is directly connected with wind energy conversion system by rotating shaft, eliminates machinery speed increasing gear box; The rotating speed that its rotating speed produces magnetic field by the rotating speed of internal rotor and power winding determines jointly.
On described internal rotor, the number of pole-pairs of permanent magnet is identical with the number of pole-pairs of controlled winding, and the rotating speed of internal rotor is identical with the rotating speed that controlled winding produces magnetic field.
The rotating speed of described external rotor is determined by the frequency of supply of controlled winding, by changing the frequency of supply of controlled winding, can realize the MPPT maximum power point tracking of wind energy conversion system.
The capacity of described AC-DC-AC power converter is the part of generator capacity and relevant with generator variable-speed operation scope, and this power is the higher value in following two 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) ÷ normal speed.
Beneficial effect:
1, add magnetic gear, eliminate machinery speed increasing gear box, improve reliability, reduce maintenance workload, improve torque density and power density.
2, magnetic gear motor has only used the harmonic field of permanent magnet, and access control winding takes full advantage of the main field of permanent magnet, improves the utilance of permanent magnet.
3, permanent magnet excitation brushless dual-feedback wind power generator power winding is directly connected with electrical network, AC-DC-AC power converter is connected to controlled winding to provide control electric current, the excitation field that permanent magnet can be made to provide for power winding remains on synchronous speed, realizes constant frequency and runs.The capacity of AC-DC-AC power converter is determined according to the speed adjustable range of generator, generally only have 20% ~ 30% of generator rated capacity, relative to magneto alternator, magnetic gear external rotor permanent magnet brushless wind generator, this generator is equal to the power inverter of electricity generation system rated capacity without the need to using, be conducive to reducing costs.
4, external rotor is adjustable magnetic rotor, and internal rotor is p-m rotor, does not all need winding, slip ring and brush, improves reliability, decrease maintenance workload.
Accompanying drawing explanation
The view in transverse section of Fig. 1 permanent magnet excitation brushless dual-feedback wind power generator 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 transimission schematic diagram of permanent magnet excitation brushless dual-feedback wind power generator of the present invention.
Have in figure: stator 1, external rotor 2, internal rotor 3, rotor endcap 4, inner rotor bearing 5, rotating shaft 6, permanent magnet 7, power winding 8, controlled winding 9, stator bearing 10, magnetic inductive block 11, wind energy conversion system 12, AC-DC-AC power converter 13.
Embodiment
Permanent magnet excitation brushless dual-feedback wind power generator of the present invention, comprises stator, external rotor, internal rotor and rotating shaft, and described stator and internal rotor are separately positioned on periphery and the inner circumferential of described external rotor; The two ends of described external rotor are provided with rotor endcap, this external rotor is connected with described rotating shaft by the rotor endcap at its two ends, described rotating shaft is fixed with inner rotor bearing, and this internal rotor is connected with rotating shaft by described inner rotor bearing, and described internal rotor also can rotate freely with external rotor is coaxial; Described stator being provided with two and overlapping independently winding---power winding and controlled winding, be respectively used to generating and control with rotating speed; Described internal rotor is the permanent magnet rotor that permanent magnet is housed; Described external rotor is the adjustable magnetic rotor being provided with magnetic inductive block, for modulating the permanent magnetic field of internal rotor, producing power winding and two kinds of excitation fields needed for controlled winding, and being directly connected by rotating shaft with wind energy conversion system.
An aspect according to permanent magnet excitation brushless dual-feedback wind power generator of the present invention: described stator is provided with two and overlaps independently winding---power winding and controlled winding, both numbers of pole-pairs are different, therefore do not have direct-coupling; Adopting two magnetic fields after internal rotor permanent-magnetic magnetic field modulation as excitation field respectively, there is not indirect coupling in both.This permanent magnet excitation brushless dual-feedback wind power generator can regard the cascade of a magnetic gear power generation machine and a permanent magnet synchronous motors as, only there is mechanical connection, there is not electricity and being coupled of magnetic.
An aspect according to permanent magnet excitation double-fed wind power generator of the present invention: described external rotor is the adjustable magnetic ring that magnetic inductive block is housed, for modulating the permanent magnetic field of internal rotor, to produce the excitation field that power winding and controlled winding need; The number of magnetic inductive block is power winding and controlled winding number of pole-pairs sum; External rotor is directly connected with wind energy conversion system, by controlling the rotating speed of external rotor, realizes the MPPT maximum power point tracking of wind energy conversion system.
An aspect according to permanent magnet excitation double-fed wind power generator of the present invention: described internal rotor is equipped with permanent magnet, the number of pole-pairs of permanent magnet is identical with controlled winding number of pole-pairs; The rotating speed of internal rotor is identical with the rotating speed that controlled winding produces magnetic field, i.e. the control of controlled winding frequency.
An aspect according to permanent magnet excitation double-fed wind power generator of the present invention: the rotating speed of described external rotor, the i.e. control of the controlled winding frequency of the rotating speed of wind energy conversion system, and relevant with the number of pole-pairs of power winding and controlled winding.
An aspect according to permanent magnet excitation double-fed wind power generator of the present invention: described controlled winding is connected with electrical network by AC-DC-AC power converter, the capacity of power inverter is the part of generator capacity and relevant with generator variable-speed operation scope, and this power is the higher value in following two 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) ÷ normal speed.
Below in conjunction with accompanying drawing, the present invention will be further described, these execution modes should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after reading this disclosure, the amendment of those skilled in the art to the various equivalent form of value of the present invention all falls within the claim limited range of the application.
Composition graphs 1 to Fig. 2 describes the structure of permanent magnet excitation brushless dual-feedback wind power generator of the present invention.As can be seen from the view in transverse section, longitudinal sectional drawing of this generator, generator forms primarily of four parts: stator 1, external rotor 2, internal rotor 3 and rotating shaft 6.Wherein stator 1 is provided with two and overlaps independently winding: p is to the power winding of pole and q to the controlled winding of pole, and described p and q is respectively positive integer, and p and q is unequal.(p+q) external rotor 2 be equipped with individual at the equally distributed magnetic inductive block 11 of circumferencial direction, fill non-magnetic epoxide resin material in space between magnetic inductive block, external rotor 2 is fixed on by the rotor endcap 4 at its two ends and also can rotates therewith in rotating shaft 6.Internal rotor 3 is equipped with permanent magnet 7, the number of pole-pairs of permanent magnet is q.
Figure 3 shows that permanent magnet excitation brushless dual-feedback wind power generator grid-connected system, rotating shaft 6 is directly connected with wind energy conversion system 12 wheel hub, and external rotor 2 is fixed in rotating shaft 6, for transmitting power from wind energy conversion system and energy.Internal rotor is arranged in rotating shaft 6 through bearing 5, at internal rotor 3, permanent magnet 7 is housed, for power winding 8 and controlled winding 9 provide excitation field.Raised the reasonable arrangement of permanent magnet 7 quantity on magnetic patch 11 quantity and internal rotor 3 by external rotor 2, realize the decoupling zero in double winding magnetic field on stator 1.
The rotating speed n of permanent magnet excitation brushless dual-feedback wind power generator external rotor of the present invention
lwith the frequency f of electric current in power winding and controlled winding
pand f
cmeet relation: n
l=60 (f
p± f
c)/(p+q).Due to mains frequency f
pfixing, the frequency of electric current in regulable control winding, just can realize the speed constant pressure constant frequency generation of this generator.And frequency, size and the phase place by controlling electric current in AC-DC-AC power converter change controlled winding, flexible that is meritorious and reactive power can also be realized.
Figure 4 shows that permanent magnet excitation brushless dual-feedback wind power generator power transimission schematic diagram, the T in figure
pfor power winding magnetic field is to the brake torque of external rotor; T
cfor controlled winding magnetic field is to the brake torque of external rotor; T
prfor the modulated magnetic field of power winding after external rotor modulating action is to the torques of internal rotor; T
crfor the modulated magnetic field of controlled winding after external rotor modulating action is to the torques of internal rotor; T
lfor wind energy conversion system is delivered to the input torque of external rotor; ω
lfor the angular velocity of rotation of external rotor, i.e. the angular velocity of rotation of wind energy conversion system; ω
pfor power winding produces the angular velocity of rotation in magnetic field; ω
rfor controlled winding produces the angular velocity of rotation in magnetic field, i.e. the stable angular velocity of rotation of internal rotor.The mechanical output that wind energy conversion system 12 passes to external rotor 2 via rotating shaft 6 is P
l=T
lω
l, the power that power winding is transported to electrical network is P
p=T
pω
p, the power that controlled winding is transported to electrical network is P
c=T
cω
r.
Permanent magnet excitation double-fed wind power generator of the present invention is a p to the magnetic gear power generation machine of pole stator winding and a q to the cascade of the permagnetic synchronous motor of pole stator winding in essence, and two motors are mechanically connected by p-m rotor, T
c=T
cr=T
pr, the magnetic field of controlled winding does not produce directly impact to the rotating speed of external rotor.In conjunction with the operation principle of magnetic gear, the operation principle of this generator is as follows: wind energy conversion system converts mechanical energy to wind energy, passes to external rotor by rotating shaft, makes external rotor angular velocity of rotation be ω
l, only by AC-DC-AC power converter adjustment controlled winding power frequency, controlling magnetic field angular velocity of rotation ω need be made
rmeet: (ω
p-ω
l)/(ω
r-ω
l)=-q/p, then permanent magnetism modulated magnetic field induces the back-emf equal with mains frequency on power winding, and after being connected to the grid, generator can realize variable speed constant frequency generator.
Permanent magnet excitation double-fed wind power generator definition controlled winding of the present invention leads to direct current (f
c=0) rotating speed of external rotor time is synchronous speed ω
l0, when wind speed is very fast, ω
l> ω
l0time, the phase sequence of controlled winding is identical with power winding, now controlled winding power output; When wind speed is comparatively slow, ω
l< ω
l0time, the phase sequence of controlled winding is identical with power winding, now controlled winding input power; Work as ω
l=ω
l0time, f
c=0, now controlled winding passes into direct current, and the energy that controlled winding provides is only for copper loss and iron loss.
Permanent magnet excitation double-fed wind power generator definition revolutional slip of the present invention is: s=(ω
l-ω
l0)/ω
l0=f
c/ f
p, controlled winding is transported to the pass that the power of electrical network and power winding be transported to the power of electrical network and is: P
c=sP
p.Then during supersynchronous operation, s is just, the mechanical output major part of wind energy conversion system is transported to electrical network by power winding, and fraction is sent to electrical network by controlled winding through power inverter; When metasynchronism is run, s is negative, and controlled winding absorbs electric energy by power inverter from electrical network, and the electrical power of absorption is delivered to power winding together with the mechanical output of wind energy conversion system, flows to electrical network.The efficiency of permanent magnet excitation double-fed wind power generator is η, and it is P that the energy transferring between the mechanical energy of wind energy conversion system input and electrical network closes
l=η (P
p+ P
c)=η (1+s) P
p.
Claims (5)
1. a permanent magnet excitation brushless dual-feedback wind power generator, it is characterized in that: this wind-driven generator comprises stator (1), external rotor (2), internal rotor (3) and rotating shaft (6), described stator (1) and internal rotor (3) are separately positioned on periphery and the inner circumferential of described external rotor (2); The two ends of described external rotor (2) are provided with rotor endcap (4), this external rotor (2) is connected with described rotating shaft (6) by the rotor endcap (4) at its two ends, described rotating shaft (6) is fixed with inner rotor bearing (5), this internal rotor (3) is connected with rotating shaft (6) by described inner rotor bearing (5), and described internal rotor (3) also can rotate freely with external rotor (2) is coaxial; Described stator (1) is provided with two and overlaps independently winding, i.e. power winding (8) and controlled winding (9); Described external rotor (2) is for being equipped with the adjustable magnetic rotor of magnetic inductive block (11); Described internal rotor (3) is for being equipped with the permanent magnet rotor of permanent magnet (7);
Described stator (1) is provided with the independent winding that two cover numbers of pole-pairs are different, wherein the power winding (8) of p to pole is directly connected with electrical network, the controlled winding (9) of q to pole is connected with electrical network through AC-DC-AC power converter (13), both magnetic field does not exist directly and indirect coupling, described p and q is respectively positive integer, and p and q is unequal.
2. permanent magnet excitation double-fed wind power generator according to claim 1, it is characterized in that: the number of the upper magnetic inductive block (11) of described external rotor (2) is p+q, be uniformly distributed in a circumferential direction, in the space of magnetic inductive block, fill non-magnetic epoxide resin material; External rotor (2) is directly connected with wind energy conversion system (12) by rotating shaft (6), eliminates machinery speed increasing gear box; The rotating speed that its rotating speed produces magnetic field by the rotating speed of internal rotor (3) and power winding (8) determines jointly.
3. permanent magnet excitation double-fed wind power generator according to claim 1, it is characterized in that: the number of pole-pairs of the upper permanent magnet of described internal rotor (3) is identical with the number of pole-pairs of controlled winding (9), and the rotating speed of internal rotor (3) is identical with the rotating speed that controlled winding (9) produces magnetic field.
4. the permanent magnet excitation double-fed wind power generator according to Claims 2 or 3, it is characterized in that the rotating speed of described external rotor (2) is determined by the frequency of supply of controlled winding (9), by changing the frequency of supply of controlled winding (9), the MPPT maximum power point tracking of wind energy conversion system can be realized.
5. permanent magnet excitation double-fed wind power generator according to claim 1, it is characterized in that: the capacity of described AC-DC-AC power converter (13) is the part of generator capacity and relevant with generator variable-speed operation scope, and this power is the higher value in following two 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) ÷ normal speed.
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| 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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| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104600930A true CN104600930A (en) | 2015-05-06 |
| CN104600930B CN104600930B (en) | 2017-06-16 |
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ID=53126526
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| CN106374704A (en) * | 2016-09-09 | 2017-02-01 | 华中科技大学 | Brushless dual-mechanical-port permanent magnet motor based on magnetic field modulation principle |
| CN106451970A (en) * | 2016-09-26 | 2017-02-22 | 东南大学 | Four-electrical port brushless double-fed motor with reluctance rotor and double stators |
| 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 |
| 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 |
| CN106505814A (en) * | 2016-10-31 | 2017-03-15 | 东南大学 | Modulate birotor brushless dual-feedback wind power generator in a kind of field |
| CN106655671A (en) * | 2016-12-12 | 2017-05-10 | 华中科技大学 | Brushless double electromechanical port permanent magnet motor with high torque density and application thereof |
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| CN106374704A (en) * | 2016-09-09 | 2017-02-01 | 华中科技大学 | Brushless dual-mechanical-port permanent magnet motor based on magnetic field modulation principle |
| CN106451970A (en) * | 2016-09-26 | 2017-02-22 | 东南大学 | Four-electrical port brushless double-fed motor with reluctance rotor and double stators |
| CN106451970B (en) * | 2016-09-26 | 2018-08-21 | 东南大学 | Four electrical port brushless dual-feed motor of reluctance rotor bimorph transducer |
| CN106505814A (en) * | 2016-10-31 | 2017-03-15 | 东南大学 | Modulate birotor brushless dual-feedback wind power generator in a kind of field |
| 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 |
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| CN106685182A (en) * | 2017-01-20 | 2017-05-17 | 哈尔滨工业大学 | Intermediate adjustable flux radial integrated electrical continuously-variable transmission |
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| CN109586340A (en) * | 2018-12-10 | 2019-04-05 | 国电联合动力技术有限公司 | Low wind speed power flow direction verification method, device and the storage medium of wind power system |
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