CN104079130A - Multistable cascading induction generator set - Google Patents
Multistable cascading induction generator set Download PDFInfo
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- CN104079130A CN104079130A CN201410347329.5A CN201410347329A CN104079130A CN 104079130 A CN104079130 A CN 104079130A CN 201410347329 A CN201410347329 A CN 201410347329A CN 104079130 A CN104079130 A CN 104079130A
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Abstract
The invention relates to a multistable cascading induction generator set. The multistable cascading induction generator set solves the technical problem that the conventional doubly-fed generators are relatively low in efficiency at low wind speed and comprises a brushless doubly-fed generator, a first switch device, a second switch device, a first set stator winding angle connecting switch, a first set stator winding star connecting switch, a second set stator winding angle connecting switch and a second set stator winding star connecting switch, wherein the stator winding of the brushless doubly-fed generator comprises a first set stator winding and a second set stator winding which are independent and different in the number of poles; the first set stator winding is connected with the angle connecting switch and the star connecting switch; the second set stator winding is connected with the angle connecting switch and the star connecting switch. According to the invention, the multistable cascading induction generator set can be used for wind power generation.
Description
Technical field
The present invention relates to a kind of generator, particularly relate to a kind of multistable cascade induction generator group.
Background technology
In technical field of wind power generation, wind turbine generator comprises two kinds of operational modes, and a kind of is constant-speed and constant-frequency operational mode, and another kind is variable speed constant frequency operational mode.Under the operational mode of constant-speed and constant-frequency, the rotating speed of generator is constant, thereby guarantees the constant frequency consistent with mains frequency, and this mode exists the defects such as wind energy utilization is low, efficiency is low, need reactive power compensator, power output is uncontrollable.So the application of variable speed constant frequency operational mode is more and more wider, under the operational mode of variable speed constant frequency, the rotating speed of generating set can change with wind speed, generating set is by the adjusting of rotor excitation current phase frequency etc., make stator side output constant frequency and constant voltage electric energy, wind power conversion efficiency is high, and efficiency is high.
The generating set of realizing at present variable speed constant frequency operational mode mainly contains double-fed asynchronous generator group and brushless double feed generator group, and especially in the wind power system of MW class, application is very wide.
For double-fed asynchronous generator group, it is provided with the gear box of high speed increasing ratio as the frequency converter of drive disk assembly, Yi Tai partial power (non-total power).
Double-fed asynchronous generator, by controlling rotor-exciting, makes the output frequency of stator remain on power frequency.When the rotor winding of double-fed asynchronous generator passes through three phase low frequency electric current, in rotor, can form a low speed rotation magnetic field, the rotary speed in this magnetic field and the mechanical separator speed of rotor are superimposed, make its synchronous speed that equals stator, thereby in generator unit stator winding, induce the power-frequency voltage corresponding to synchronous speed.When wind speed changes, rotating speed changes thereupon, correspondingly changes the frequency of rotor current and the speed of rotating magnetic field, will make stator output frequency keep constant.
When the rotating speed of generator is during lower than the rotating speed of air-gap rotating magnetic field, generator is in the operation of metasynchronism speed, consistent with mains frequency in order to guarantee the frequency that generator sends, need frequency converter to provide positive phase sequence excitation to generator amature, give the input of rotor winding an exciting current that its rotating magnetic field direction is identical with rotor mechanical direction, now, the brake torque of rotor is contrary with the mechanical steering of rotor, the electric current of rotor must with the induction back electromotive force of rotor in the other direction, revolutional slip reduces, stator is to electrical network feeding electric power, and frequency converter is to rotor winding input power, the power of input absorbs from electrical network, the electric energy of waste electrical network, when the rotating speed of generator is during higher than the rotating speed of air-gap rotating magnetic field, generator is in supersynchronous speed operation, consistent with mains frequency in order to guarantee the frequency that generator sends, need to give the exciting current of its rotating magnetic field direction of rotor winding input and rotor mechanical opposite direction, now frequency converter provides negative-phase sequence excitation to generator amature, to strengthen revolutional slip, frequency converter is from rotor winding absorbed power, when the rotating speed of generator equals the rotating speed of air-gap rotating magnetic field, generator moves in synchronous speed, frequency converter should provide DC excitation to rotor, now, the brake torque of rotor is contrary with the mechanical steering of rotor, equidirectional with the torque that rotor induced current produces, stator and rotor are all to electrical network feeding electric power.
The greatest problem that double-fed asynchronous generator exists is to need frequency converter to absorb electric energy to the rotor of double-fed generator from electrical network while generating electricity under low wind speed, so just makes generating efficiency reduce, and frequency converter can bring harmonic pollution to electrical network simultaneously.
For brushless double feed generator, its stator has the different winding of the separate number of poles of two covers, and a set of is power winding, directly get access to grid, another set of is to control winding, by two-way four-quadrant frequency converter, gets access to grid, and two-way four-quadrant frequency converter is used for realizing constant frequency output effect.Brushless double feed generator is without slip ring and brush, move more reliable, but still to use bi-directional frequency converter, cause cost still very high, control method is still complicated, especially, for the unit of MW class level, cost is too high.
Summary of the invention
The present invention is exactly in order to solve the existing double-fed generator lower technical problem of timeliness rate of generating electricity under low wind speed, the much higher stable state cascade of a kind of generating efficiency induction generator group to be provided.
The present invention is the improvement on the basis of existing brushless double feed generator.
Technical scheme of the present invention is, a kind of multistable cascade induction generator group is provided, comprise brushless double feed generator, the first switching device, second switch device, first set stator winding corner connection switch, first set stator winding star connects switch, the second cover stator winding corner connection switch and the second cover stator winding star connect switch, the stator winding of brushless double feed generator comprises first set stator winding and the second cover stator winding that separate number of poles is different, first set stator winding is provided with three head ends and three tail ends, the second cover stator winding is provided with three head ends and three tail ends, three head ends of first set stator winding are connected with the first switching device, three tail ends of first set stator winding connect switch with first set stator winding star and are connected, and between three head ends of first set stator winding and three tail ends of first set stator winding, by first set stator winding corner connection switch, connect, three head ends of the second cover stator winding are connected with second switch device, three tail ends of the second cover stator winding connect switch with the second cover stator winding star and are connected, and the second three head ends and second that overlap stator winding overlap between three tail ends of stator winding and connect by the second cover stator winding corner connection switch.
Preferably, switching device is contactor or electronic power switch device.
Preferably, also comprise controller and speed probe, speed probe is located on brushless double feed generator and with controller and is connected, and the first switching device, second switch device, first set stator winding corner connection switch, first set stator winding star connect switch, the second cover stator winding corner connection switch connects switch with the second cover stator winding star and is connected with controller respectively.
No matter the invention has the beneficial effects as follows, can complete multistage (at least 8 kinds) mode of operation, be under high wind speed or low wind speed, can meet generating requirement, and generating efficiency improves greatly, and wind energy utilization is higher.
Further aspect of the present invention, by the description of the embodiment below with reference to accompanying drawing, is clearly recorded.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Symbol description in figure:
1. brushless double feed generator; 2. gear box; 3. impeller; 4. electrical network; KM1. the first switching device, KM2. second switch device, KM1
△for first set stator winding corner connection switch, KM1
yfor first set stator winding star connects switch, KM2
△be the second cover stator winding corner connection switch, KM2
ybe that the second cover stator winding star connects switch.
Embodiment
As shown in Figure 1, the impeller 3 of wind generator system and the input mechanical connection of gear box 2, the output shaft of gear box 2 is connected with the rotor of brushless double feed generator 1.The stator winding of brushless double feed generator 1 comprises the different winding of the separate number of poles of two covers, and first set is U1U2, V1V2, W1W2, and number of poles is 2p; The second cover is R1R2, S1S2, T1T2, and number of poles is 2q.
The U1 of first set stator winding, V1, tri-head ends of W1 are connected with electrical network 4 by the first switching device KM1, and the U2 of first set stator winding, V2, tri-tail ends of W2 and first set stator winding star meet K switch M1
yconnect.Meanwhile, between U1, V1, tri-head ends of W1 and U2, V2, tri-tail ends of W2, pass through first set stator winding corner connection K switch M1
△connect.
Tri-head ends of R1, S1, T1 of the second cover stator winding are connected with electrical network 4 by second switch device KM2, and tri-tail ends of R2, S2, T2 of the second cover stator winding and the second cover stator winding star meet K switch M2
yconnect.Meanwhile, between R1, S1, tri-head ends of T1 and R2, S2, tri-tail ends of T2, by second, overlap stator winding corner connection K switch M2
△connect.
When first set stator winding star meets K switch M1
yduring connection, first set stator winding connects with Y shape, as first set stator winding corner connection K switch M1
△during connection, first set stator winding connects with △.That is to say, when first set stator winding star meets K switch M1
ywith the first switching device KM1 conducting simultaneously, first set stator winding corner connection K switch M1
△during disconnection, first set stator winding connects generating with Y shape and supplies with electrical network 4.As first set stator winding corner connection K switch M1
△with the first switching device KM1 conducting simultaneously, first set stator winding star meets K switch M1
yduring disconnection, first set stator winding connects generating with △ shape and supplies with electrical network 4.
When the second cover stator winding star meets K switch M2
yduring connection, the second cover stator winding connects with Y shape, as the second cover stator winding corner connection K switch M2
△during connection, the second cover stator winding connects with △.That is to say, when the second cover stator winding star meets K switch M2
ywith second switch device KM2 conducting simultaneously, the second cover stator winding corner connection K switch M2
△during disconnection, the second cover stator winding connects generating with Y shape and supplies with electrical network 4.As the second cover stator winding corner connection K switch M2
△with second switch device KM2 conducting simultaneously, the second cover stator winding star meets K switch M2
yduring disconnection, the second cover stator winding connects generating with △ shape and supplies with electrical network 4.
Below the course of work of the present embodiment is described in detail:
The wind-force size catching according to wind generator system, according to the rotating speed size of the output shaft of gear box 2, adjust the Y-delta connection of first set stator winding and the Y-delta connection of the second cover stator winding, rotating speed with coupling gear box 2 output shafts, makes brushless double feed generator 1 generate electricity with maximal efficiency.As shown in Table 1: rotating speed when n1 represents that first set stator winding Y connects,
represent rotating speed when first set stator winding △ connects, rotating speed when n2 represents that the second cover stator winding Y connects,
represent rotating speed when the second cover stator winding △ connects.There are 8 kinds of states, form 8 grades of stable states and control generating.
Table one:
Adjust transfer process and meet K switch M1 by first set stator winding star
y, first set stator winding corner connection K switch M1
△, the second cover stator winding star meets K switch M2
y, the second cover stator winding corner connection K switch M2
△, the first switching device KM1 and these switching devices of second switch device KM2 have coordinated.Each switch specifically can select contactor, relay, electronic power switch device or other to play the device of on-off action.
The conducting that can select the controllers such as PLC controller or known non-two-way common frequency converter to control above-mentioned each switch disconnects action, use speed probe to be arranged on brushless double feed generator 1, its tach signal to be sent to PLC controller or common frequency converter, by PLC controller or common frequency converter to each switch sending controling instruction.In this case, speed probe is connected with PLC controller or common frequency converter, each switch respectively with PLC controller or common frequency converter.
The above is the preferred embodiment to invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Every in claim limited range of the present invention, any modification of making, be equal to replacement, improvement etc., all should be within protection scope of the present invention.
Claims (3)
1. a multistable cascade induction generator group, it is characterized in that, comprise brushless double feed generator, the first switching device, second switch device, first set stator winding corner connection switch, first set stator winding star connects switch, the second cover stator winding corner connection switch and the second cover stator winding star connect switch, the stator winding of described brushless double feed generator comprises first set stator winding and the second cover stator winding that separate number of poles is different, described first set stator winding is provided with three head ends and three tail ends, described the second cover stator winding is provided with three head ends and three tail ends, three head ends of described first set stator winding are connected with described the first switching device, three tail ends of described first set stator winding connect switch with described first set stator winding star and are connected, and between three head ends of described first set stator winding and three tail ends of described first set stator winding, by described first set stator winding corner connection switch, connect, three head ends of described the second cover stator winding are connected with described second switch device, three tail ends of described the second cover stator winding connect switch with described the second cover stator winding star and are connected, and three head ends of described the second cover stator winding and described second overlap and between three tail ends of stator winding, by described second, overlap stator winding corner connection switch and connect.
2. multistable cascade induction generator group according to claim 1, is characterized in that, described switching device is contactor or electronic power switch device.
3. multistable cascade induction generator group according to claim 2, it is characterized in that, also comprise controller and speed probe, described speed probe is located on described brushless double feed generator and with described controller and is connected, and described the first switching device, described second switch device, described first set stator winding corner connection switch, described first set stator winding star connect switch, described the second cover stator winding corner connection switch connects switch with described the second cover stator winding star and is connected with described controller respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410347329.5A CN104079130A (en) | 2014-07-21 | 2014-07-21 | Multistable cascading induction generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410347329.5A CN104079130A (en) | 2014-07-21 | 2014-07-21 | Multistable cascading induction generator set |
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| CN104079130A true CN104079130A (en) | 2014-10-01 |
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| CN201410347329.5A Pending CN104079130A (en) | 2014-07-21 | 2014-07-21 | Multistable cascading induction generator set |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162376A (en) * | 2015-09-21 | 2015-12-16 | 南车株洲电力机车研究所有限公司 | Doubly-fed wind turbine generator control method and generator |
| CN113037143A (en) * | 2021-04-23 | 2021-06-25 | 大庆恒特电机有限公司 | Flexible dragging method of oil pumping unit |
| CN114498991A (en) * | 2021-12-30 | 2022-05-13 | 西安中车永电捷力风能有限公司 | Stator winding connection structure of double-fed wind driven generator |
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| CN102006000A (en) * | 2010-11-24 | 2011-04-06 | 南京航空航天大学 | Non-directly grid-connected wind driven generator with connection type of power winding variable and method |
| CN201953572U (en) * | 2011-02-24 | 2011-08-31 | 中科盛创（青岛）电气有限公司 | Direct-driven switched reluctance wind power generator system with concentric two-stator structure |
| CN102868346A (en) * | 2012-08-16 | 2013-01-09 | 北京索德电气工业有限公司 | Brushless doubly-fed motor excitation control system and control method using same |
| CN203984196U (en) * | 2014-07-21 | 2014-12-03 | 威海戥同测试设备有限公司 | A kind of multistable cascade induction generator group |
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2014
- 2014-07-21 CN CN201410347329.5A patent/CN104079130A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1610222A (en) * | 2003-04-28 | 2005-04-27 | 富士陶瓷技术株式会社 | Magneto generator |
| CN102006000A (en) * | 2010-11-24 | 2011-04-06 | 南京航空航天大学 | Non-directly grid-connected wind driven generator with connection type of power winding variable and method |
| CN201953572U (en) * | 2011-02-24 | 2011-08-31 | 中科盛创（青岛）电气有限公司 | Direct-driven switched reluctance wind power generator system with concentric two-stator structure |
| CN102868346A (en) * | 2012-08-16 | 2013-01-09 | 北京索德电气工业有限公司 | Brushless doubly-fed motor excitation control system and control method using same |
| CN203984196U (en) * | 2014-07-21 | 2014-12-03 | 威海戥同测试设备有限公司 | A kind of multistable cascade induction generator group |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162376A (en) * | 2015-09-21 | 2015-12-16 | 南车株洲电力机车研究所有限公司 | Doubly-fed wind turbine generator control method and generator |
| CN105162376B (en) * | 2015-09-21 | 2018-05-01 | 南车株洲电力机车研究所有限公司 | A kind of double-fed fan motor unit generator control method and generator |
| CN113037143A (en) * | 2021-04-23 | 2021-06-25 | 大庆恒特电机有限公司 | Flexible dragging method of oil pumping unit |
| CN114498991A (en) * | 2021-12-30 | 2022-05-13 | 西安中车永电捷力风能有限公司 | Stator winding connection structure of double-fed wind driven generator |
| CN114498991B (en) * | 2021-12-30 | 2024-06-07 | 西安中车永电捷力风能有限公司 | Stator winding connection structure of doubly-fed wind generator |
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Application publication date: 20141001 |
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