CN201877916U - Brushless double-fed wind power generator - Google Patents
Brushless double-fed wind power generator Download PDFInfo
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- CN201877916U CN201877916U CN2010206159574U CN201020615957U CN201877916U CN 201877916 U CN201877916 U CN 201877916U CN 2010206159574 U CN2010206159574 U CN 2010206159574U CN 201020615957 U CN201020615957 U CN 201020615957U CN 201877916 U CN201877916 U CN 201877916U
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Abstract
Disclosed is a brushless double-fed wind power generator. Numbers of pole pairs of a power winding and a control winding of a stator are respectively pp and pc, a mixed rotor is positioned in the stator and provided with pp+pc salient poles, each salient pole is provided with a plurality of slits, leads are disposed in the slits, and the ends of the inner leads in adjacent slits are shorted to form a concentric coil. The brushless double-fed wind power generator is in a mixed rotor novel structure combining traditional magnetic resistance with cage type rotor, and is more superior in performance than those of the traditional reluctance rotor and the cage type rotor. A torque control scheme is directly used in an excitation control means, while the speed sensorless control technique is adopted, so that the brushless double-fed wind power generator is more applicable to severe wind fields, and has fine highest power tracking and response capacity.
Description
Technical field
The utility model belongs to wind generator system, is specifically related to have the direct Torque Control of the brushless dual-feedback wind power generator of mixed rotor structure.
Background technology
In recent years, brushless double feed generator has obtained the extensive concern of Chinese scholars in the variable-speed constant-frequency wind power generation field with himself advantage.But, because the stator of brushless double feed generator has the different winding of two cover numbers of poles, its internal magnetic field relation is complicated more a lot of than conventional induction generator, therefore how it is control effectively and become difficult point and the hot issue that needs to be resolved hurrily in the variable speed constant frequency brushless double feed wind power generation field, especially one of key problem of wind turbine generator control---maximal power tracing problem is to improve wind power generation efficient.At present, Chinese scholars mainly concentrates on the power Control Study of brushless dual-feedback wind power generator and adopts power winding field orientation vector control method that the active power and the reactive power of generator are carried out decoupling zero, realizes maximal power tracing by independent control active power and reactive power.But vector control need be carried out coordinate transform, and amount of calculation is big, and is subject to the influence that generator parameter changes, and this greatly reduces the robustness of system.
Summary of the invention
The utility model is at the brushless double feed generator with mixed rotor structure, a kind of excitation system based on the Speedless sensor direct torque control is provided, the robustness of enhanced system, make brushless dual-feedback wind power generator more be applicable to abominable wind field environment, and have good maximal power tracing responding ability.
The technical solution of the utility model is:
Brushless dual-feedback wind power generator comprises stator and rotor, it is characterized in that: embed on the stator two the cover windings, promptly the power winding and control winding, number of pole-pairs is respectively
p pWith
p cRotor is a mixed rotor, is positioned at stator interior; On mixed rotor, have
p p+
p cIndividual salient pole, each salient pole upper edge rotating shaft a plurality of slits are axially arranged, lead and NULL embed in the adjacent slits of salient pole, and the wire termination short circuit in the salient pole adjacent slits, constitute concentric coil.
Number of stator slots is 72 grooves.
The number of poles of stator power winding and control winding is respectively 12 utmost points and 8 utmost points, and is double-deck short distance winding, promptly groove is embedded four layers of winding, and the power winding is at the top, and the control winding is in the bottom.
The air gap of stator is 0.5mm.
The NULL number of plies in the salient pole adjacent slits is 1 ~ 4 layer.
The mixed rotor new structure that the disclosed brushless dual-feedback wind power generator of the utility model adopts traditional magnetic resistance and cage-type rotor to combine has more excellent performance than traditional reluctance rotor and cage-type rotor.The excitation control mode adopts Strategy of Direct Torque Control, and in conjunction with the Speedless sensor control technology, makes brushless dual-feedback wind power generator more be applicable to abominable wind field environment, and has good maximal power tracing responding ability.
Description of drawings:
Fig. 1 is the structural representation of brushless double feed wind generator system;
Fig. 2 is the principle schematic of Speedless sensor direct Torque Control;
Fig. 3 is the brushless dual-feedback wind power generator schematic diagram;
Description of reference numerals:
1. wind energy conversion system; 2. brushless dual-feedback wind power generator; 3. transformer; 4. wind energy conversion system operation characteristic curve; 5. stator; 6. mixed rotor; 7. concentric coil; 8. rotating shaft; 9. every magnetosphere.
Embodiment:
Below in conjunction with accompanying drawing the utility model is specifically described:
The structural representation of Fig. 1 brushless double feed wind generator system, as shown in the figure, wind energy conversion system 1 connects brushless dual-feedback wind power generator by gearbox, brushless dual-feedback wind power generator connects load and two-way PWM frequency converter respectively, load connects electrical network, and two-way PWM frequency converter also is connected with electrical network by transformer; Two-way PWM frequency converter also connects level controlling system, and last level controlling system one end connects the voltage and current signal checkout gear, and the other end connects man-machine interface.
Fig. 2 is respectively the structure composition of brushless double feed wind generator system and the schematic diagram of exciter control system thereof, wherein,
vBe wind speed;
P mBe the generator absorbed power;
PfBe power factor; Subscript ^ represents the estimated value of corresponding amount.
Because the direct torque control theory is based upon in the static reference frame of two-phase, so the present invention will be based on the rotor speed of brushless dual-feed motor
DqNumber of axle model is derived the Mathematical Modeling of mixed rotor type brushless dual-feedback wind power generator in the static reference frame of two-phase, and the result is as follows:
The voltage of power winding and magnetic linkage equation:
The voltage and the magnetic linkage equation of control winding:
The voltage of rotor winding and magnetic linkage equation:
(3)
The electromagnetic torque equation:
Power equation:
In the formula,
uBe voltage;
iBe electric current;
ΨBe magnetic linkage;
RBe resistance;
LBe self-induction;
MBe mutual inductance;
ω rBe generator speed;
θ rBe the generator amature angle of displacement;
T eBe total electromagnetic torque;
PBe active power;
QBe reactive power; Subscript
pExpression power winding; Subscript
cExpression control winding; Subscript
rThe expression rotor; Subscript
sBe illustrated in the two-phase rest frame; Subscript
dThe expression corresponding amount
dThe axle component, subscript
qThe expression corresponding amount
qThe axle component.
At the brushless double feed wind generator system, the excitation control mode adopts the direct torque control method.According to wind energy conversion system operation characteristic curve 4 as can be known, has one-to-one relationship between generator absorption maximum power and the rotating speed, promptly under the certain situation of wind speed, the corresponding generator speed value of an absorption maximum power points is all arranged on every wind energy conversion system operation characteristic curve, this tachometer value is made as generator optimum speed value.The present invention utilizes this relation exactly, change according to wind speed, with the velocity setting of the pairing tachometer value of absorption maximum power points on these curves as direct torque control, and then it is given to obtain torque, that is to say, from the angle of controlling torque,, can obtain absorption maximum power as long as make the actual torque tracing preset torque rapidly and accurately of generator.
Flux linkage set then adopts the maximum power factor principle, and this is that power factor is very important performance index, its set-point because in wind generator system
Pf * Be to be determined by the required actual value of electrical network, for improving generating efficiency, improving the quality of power supply, often improve the power factor of wind generator system by reactive-load compensation method, make it be tending towards 1 as far as possible, the reactive power that flows through power winding side like this will go to zero.At this moment, the flux linkage set of control winding is
In the formula, subscript * represents the set-point of corresponding amount.
In direct torque control, photoimpact encoder or tachogenerator are adopted in the detection of velocity feedback quantity more, but will increase the cost and the complexity of system at generator end installation rate transducer, the reliability of reduction system, make system should not be used for bad working environment, this and brushless double feed generator are removed the purpose of brush and slip ring and are disagreed.The present invention is directed to the internal magnetic field relation of mixed rotor type brushless double feed generator complexity, derive a kind of new speed observation procedure, utilize
ω r=
ω e+
ω SlRelation is by the synchronous rotary speed of estimation rotor flux
ω eAnd slip speed
ω SlEstimate generator speed.The control of realization Speedless sensor has crucial meaning to improving system reliability and environmental suitability.
The synchronous rotary speed of rotor flux
ω eAnd slip speed
ω SlThe estimation formula be respectively:
By formula (8) as can be seen, slip speed is estimated and load
R rRelevant, make the process of estimation slip speed will be subjected to the influence that parameter changes, the robustness that this greatly reduces speed observer makes it can not estimate the rotating speed of generator rapidly and accurately under the situation of load variations.Therefore, in the estimation process of slip speed, introduced fuzzy control, design the fuzzy observer of slip speed, the robustness of Speedless sensor control system makes it can not estimate the rotating speed of generator rapidly and accurately under the situation of load variations during with the raising load variations.
Fig. 3 is the brushless dual-feedback wind power generator schematic diagram, as shown in the figure, the groove number of stator 5 is 72 grooves, and air gap is 0.5mm, embeds two cover windings on the stator 5, be power winding and control winding, number of pole-pairs is respectively 12 utmost points and 8 utmost points, and is double-deck short distance winding, promptly groove is embedded four layers of winding, the power winding is at the top, and the control winding is in the bottom.
Rotor adopts mixed rotor 6, is positioned at stator 5 inside; 8 salient poles of 12+ are arranged on mixed rotor 6, in each salient pole upper edge rotating shaft 8 a plurality of slits are arranged axially, lead embeds in the adjacent slits of salient pole, filling NULL then constitutes every magnetosphere 9, play of the effect of restriction magnetic flux on the one hand every magnetosphere 9, can also dispel the heat on the other hand according to the path circulation of hope.With the wire termination short circuit in the salient pole adjacent slits, constitute concentric coil 7.In fact the concentric coil 7 that is embedded has constituted cage type rotor structure, so just constituted mixed rotor structure based on magnetic resistance and cage-type rotor combination, this structure has reluctance rotor and cage-type rotor denominator and advantage, can improve the magnetic field modulation ability of rotor to air gap, realize the number of poles transformation of these motor two cover stator winding efficiently, improve the runnability of motor.Added in the salient pole of such rotor can be 1 ~ 4 every the magnetosphere number range, when the brushless double feed generator number of poles increases, will suitably reduce every the magnetosphere number.
Adopt the brushless dual-feedback wind power generator of this novel mixed rotor structure to have following characteristics: simply be easy on the structure realize, brushless reliable; The number of poles transfer capability of generator is greatly improved, and the magnetic field modulation effect improves a lot than existing such generator, and the efficient of generator is improved, and volume is with reduced; The multipole number design of the easier realization of such rotor generator, and have better coupling performance and operation stability when several multipole.The version of mixed rotor has overcome the inefficient problem of brushless double feed generator, and is easy to realize on technology.
Claims (5)
1. brushless dual-feedback wind power generator comprises stator and rotor, it is characterized in that: embed on the stator two the cover windings, promptly the power winding and control winding, number of pole-pairs is respectively
p pWith
p cRotor is a mixed rotor, is positioned at stator interior; On mixed rotor, have
p p+
p cIndividual salient pole, each salient pole upper edge rotating shaft a plurality of slits are axially arranged, lead and NULL embed in the adjacent slits of salient pole, and the wire termination short circuit in the salient pole adjacent slits, constitute concentric coil.
2. according to the described brushless dual-feedback wind power generator of claim 1, it is characterized in that: number of stator slots is 72 grooves.
3. according to the described brushless dual-feedback wind power generator of claim 1, it is characterized in that: the number of poles of stator power winding and control winding is respectively 12 utmost points and 8 utmost points, and is double-deck short distance winding, promptly groove is embedded four layers of winding, the power winding is at the top, and the control winding is in the bottom.
4. according to the described brushless dual-feedback wind power generator of claim 1, it is characterized in that: the air gap of stator is 0.5mm.
5. according to the described brushless dual-feedback wind power generator of claim 1, it is characterized in that: the NULL number of plies in the salient pole adjacent slits is 1 ~ 4 layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206159574U CN201877916U (en) | 2010-11-21 | 2010-11-21 | Brushless double-fed wind power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206159574U CN201877916U (en) | 2010-11-21 | 2010-11-21 | Brushless double-fed wind power generator |
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| Publication Number | Publication Date |
|---|---|
| CN201877916U true CN201877916U (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206159574U Expired - Fee Related CN201877916U (en) | 2010-11-21 | 2010-11-21 | Brushless double-fed wind power generator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005843A (en) * | 2010-11-21 | 2011-04-06 | 沈阳工业大学 | Brushless double-fed wind driven generator and method for controlling brushless double-fed wind driven generating system |
| CN102983590A (en) * | 2012-11-28 | 2013-03-20 | 沈阳工业大学 | System and method for controlling direct power of open-winding brushless double-fed wind driven generator |
| CN103782494A (en) * | 2011-07-15 | 2014-05-07 | 风能科技有限公司 | Brushless doubly fed machines |
| CN104518713A (en) * | 2014-12-17 | 2015-04-15 | 华中科技大学 | Position-sensor-free speed regulating control method for brushless doubly-fed motor |
| CN104810951A (en) * | 2015-05-12 | 2015-07-29 | 广东上水能源科技有限公司 | Novel brushless doubly-fed motor |
| CN104852652A (en) * | 2015-05-06 | 2015-08-19 | 北京天诚同创电气有限公司 | Synchronous wind driven generator closed-loop vector control method and system |
| CN105529976A (en) * | 2014-09-29 | 2016-04-27 | 华中科技大学 | Output frequency control method for brushless doubly-fed generator without position sensor |
| CN106411205A (en) * | 2016-09-05 | 2017-02-15 | 华中科技大学 | Rotating speed identification method and system of brushless doubly-fed motor |
-
2010
- 2010-11-21 CN CN2010206159574U patent/CN201877916U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005843B (en) * | 2010-11-21 | 2013-04-24 | 沈阳工业大学 | Brushless double-fed wind driven generator and method for controlling brushless double-fed wind driven generating system |
| CN102005843A (en) * | 2010-11-21 | 2011-04-06 | 沈阳工业大学 | Brushless double-fed wind driven generator and method for controlling brushless double-fed wind driven generating system |
| CN103782494A (en) * | 2011-07-15 | 2014-05-07 | 风能科技有限公司 | Brushless doubly fed machines |
| CN102983590A (en) * | 2012-11-28 | 2013-03-20 | 沈阳工业大学 | System and method for controlling direct power of open-winding brushless double-fed wind driven generator |
| CN105529976A (en) * | 2014-09-29 | 2016-04-27 | 华中科技大学 | Output frequency control method for brushless doubly-fed generator without position sensor |
| CN105529976B (en) * | 2014-09-29 | 2018-04-24 | 华中科技大学 | The brushless double feed generator output frequency control method of position-sensor-free |
| CN104518713B (en) * | 2014-12-17 | 2017-02-22 | 华中科技大学 | Position-sensor-free speed regulating control method for brushless doubly-fed motor |
| CN104518713A (en) * | 2014-12-17 | 2015-04-15 | 华中科技大学 | Position-sensor-free speed regulating control method for brushless doubly-fed motor |
| CN104852652A (en) * | 2015-05-06 | 2015-08-19 | 北京天诚同创电气有限公司 | Synchronous wind driven generator closed-loop vector control method and system |
| CN104852652B (en) * | 2015-05-06 | 2017-09-22 | 北京天诚同创电气有限公司 | Synchronous wind driven generator closed-loop vector control method and system |
| CN104810951A (en) * | 2015-05-12 | 2015-07-29 | 广东上水能源科技有限公司 | Novel brushless doubly-fed motor |
| CN104810951B (en) * | 2015-05-12 | 2018-02-16 | 广东上水能源科技有限公司 | A kind of brushless dual-feed motor |
| CN106411205A (en) * | 2016-09-05 | 2017-02-15 | 华中科技大学 | Rotating speed identification method and system of brushless doubly-fed motor |
| CN106411205B (en) * | 2016-09-05 | 2018-08-21 | 华中科技大学 | A kind of Speed Identification method and system of brushless dual-feed motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20151121 |
|
| EXPY | Termination of patent right or utility model |