CN202455089U - Megawatt-grade direct-driven type mouse cage asynchronous generator AC-DC-AC wind power generation system - Google Patents
Megawatt-grade direct-driven type mouse cage asynchronous generator AC-DC-AC wind power generation system Download PDFInfo
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- CN202455089U CN202455089U CN201120436977XU CN201120436977U CN202455089U CN 202455089 U CN202455089 U CN 202455089U CN 201120436977X U CN201120436977X U CN 201120436977XU CN 201120436977 U CN201120436977 U CN 201120436977U CN 202455089 U CN202455089 U CN 202455089U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present utility model relates to a megawatt-grade direct-driven type mouse cage asynchronous generator AC-DC-AC wind power generation system, in which a medium voltage mouse cage asynchronous generator is adopted as a wind generator. The system comprises a mouse cage asynchronous generator, a megawatt-grade four-quadrant AC-DC-AC current transformer and a phase-shifting transformer, the current transformer is a chain type structure formed by connecting a plurality of power units in series, the other end of the current transforming chain is connected with a stator winding corresponding to the mouse cage asynchronous generator; the medium voltage mouse cage asynchronous generator is adopted in the wind power generation system, the generator is small in size, light in weight, convenient for installing and maintenance-free; the voltage grade is medium voltage; a speedup gear box and an electric brush are not necessary, the capacity of the wind power generation system can be enhanced to the greater extent, difficulty and costs of manufacturing a high-capacity motor can be reduced, the system reliability can be enhanced, and the low voltage crossing function can be conveniently realized.
Description
Technical field
The utility model relates to wind generator system, and is particularly a kind of with the megawatt-stage direct-drive type mouse cage asynchronous generator AC-DC-AC wind generator system of the mouse cage asynchronous generator of middle pressure as wind-driven generator.
Background technology
Domestic present existing wind generator system mainly adopts two kinds of wind generating technologies: direct-driving type and double-fed.The wind-driven generator of direct-driving type wind power generation technology mainly adopts magneto alternator; Its major defect is: the permanent magnetic material price skyrockets; The cost that causes making magneto alternator rises significantly, has a strong impact on the competitiveness of wind energy turbine set construction cost and wind power generation mode; The double-fed wind-driven power generation technology adopts the coil wound rotor asynchronous generator; Though its cost is low, in light weight; But owing to there is step-up gear, and motor itself has brush, causes reliability of system operation low; Particularly be difficult to for a long time solve, make wind generator system be difficult to realize that low-voltage passes through function owing to line voltage falls the problem that wind generator system can't normally be moved once in a while.
In order to solve the high problem of magneto alternator cost, the someone proposes to adopt electric excitation synchronous generator to substitute the imagination of magneto alternator.Yet under the equal-wattage grade, electric excitation synchronous generator is a lot of more than the permagnetic synchronous motor Heavy Weight, to the problem of the newly-increased many structures of wind generator system, mechanical resistance properties aspect; And, influenced the wind generator system reliability of operation, and brushless electric excitation synchronous generator length is longer, weight is heavier, causes the problem of structure and mechanical resistance properties aspect more outstanding owing to there is brush electric excitation synchronous generator to have brush.
The utility model content
The purpose of the utility model provides the mouse cage asynchronous generator AC-DC-AC of a kind of megawatt-stage direct-drive type wind generator system, presses mouse cage asynchronous generator during this wind generator system adopts, and size is little, in light weight, easy for installation, non-maintaining; Electric pressure is middle pressure; Need not characteristics such as step-up gear and brush, can improve the capacity of wind generator system to a greater extent, reduce to make the difficulty and the cost of large-size machine, improve system reliability, be convenient to realize that low-voltage passes through function.
The utility model adopts the power unit cascade technology based on the full-control type device for power switching; Make electric pressure be increased to middle pressure; System bears current class and reduces greatly; When electrical network instantaneous voltage occurs and falls fault, the higher enabling capabilities to electrical network can be provided, improved the fail safe and the reliability of the operation of wind generator system; The mode of many power unit cascades can also realize many level outputs simultaneously, improves the output quality of power supply, has reduced the pollution of wind generator system to electrical network; In addition, the AC-DC-AC type current transformer of this wind generator system has the function of dynamic reactive generator concurrently, can carry out in real time, compensate effectively the idle of electrical network.
For realizing above-mentioned purpose, the utility model is realized through following technical scheme:
The mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type wind generator system; Comprise mouse cage asynchronous generator, MW class four-quadrant indirect AC convertor, phase shifting transformer; Described MW class four-quadrant indirect AC convertor is the chain structure that a plurality of power unit cascades are formed, and every is a unsteady flow chain mutually; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase, and the stator winding that the other end of three unsteady flow chains is corresponding with mouse cage asynchronous generator links to each other; The three-phase alternating current that mouse cage asynchronous generator sends; Power cell rectification module rectification in every phase unsteady flow chain converts direct current to; Inversion module through this power cell converts direct current to alternating current again, and the three-phase alternating current output of each power cell is connected to the secondary winding of the corresponding phase of phase shifting transformer again in each unsteady flow chain; Be coupled to former limit three phase windings of phase shifting transformer through the iron core of phase shifting transformer, the former limit A of transformer, B, C three phase windings are connected with A, B, the C three of electrical network respectively, realize carrying the mesohigh electric energy to electrical network.
The three-phase output end of described mouse cage asynchronous generator directly is connected with the corresponding unsteady flow mutually of MW class four-quadrant indirect AC convertor chain power cell rectification module, and machine driving need not step-up gear.
During adopting, described mouse cage asynchronous generator presses mouse cage asynchronous generator.
The power cell of said unsteady flow chain is supported electric capacity, copped wave brake module and three-phase inversion module and is connected to form successively by input side to outlet side by H bridge rectification module, direct current; N H bridge rectification module is connected to form chain structure in each unsteady flow chain; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase, and the stator winding that the other end of three unsteady flow chains is corresponding with mouse cage asynchronous generator links to each other; The inversion module three-phase alternating current output of each power cell is connected to the secondary winding of the corresponding phase of phase shifting transformer in every chain, carries the mesohigh electric energy to electrical network.
This wind generator system is except that being applicable to the three-phase squirrel cage asynchronous generator; Also can with the supporting use of heterogeneous mouse cage asynchronous generator; Has M cover threephase stator winding like heterogeneous mouse cage asynchronous generator; Then said MW class four-quadrant indirect AC convertor has 3M bar unsteady flow chain, and an end of three unsteady flow chains that link to each other with every cover stator winding links together, and every unsteady flow chain other end is connected to the phase in the every cover stator winding of heterogeneous mouse cage asynchronous generator.
But described wind generator system is double as dynamic reactive generator also, realizes the idle real-Time Compensation of carrying out to electrical network.
Compare with existing wind generating technology, the utility model has significant advantage at following aspects:
1) compare with magneto alternator, the cost of making mouse cage asynchronous generator is much lower more than the cost of making magneto alternator, makes the construction wind energy turbine set have more economic benefit.
2) with being arranged, the electric excitation synchronous generator of brush compares with the brush-less electrically exciting synchronous generator; Mouse cage asynchronous generator volume is little, in light weight, easy for installation, non-maintaining, cost is low, reliability is high, can reduce the problem of the newly-increased many structures of electricity generation system, mechanical resistance properties aspect.
3) compare with application double-fed wire-wound asynchronous generator; Press mouse cage asynchronous generator AC-DC-AC wind generator system to adopt no step-up gear design in the direct-driving type; Do not have gear box leakage of oil, oil impregnate and gear teeth breakage problem, reliability is high and be convenient to realize that low-voltage passes through function.
4) adopt three-phase or heterogeneous middle mouse cage asynchronous generator of pressing, under the same power condition, system bears current class and reduces, and can improve the capacity of wind generator system to a greater extent, reduces the difficulty and the cost of manufacturing large-size machine.
5) megawatt level direct drive type AC-DC-AC type current transformer adopts the mode of many power unit cascades to realize many level outputs, has improved the output quality of power supply greatly, reduces the pollution of wind generator system to electrical network.
6) the unsteady flow chain structure of megawatt level direct drive type AC-DC-AC type current transformer is convenient to the output of voltage levels.
7) but megawatt level direct drive type AC-DC-AC type current transformer double as dynamic reactive generator electrical network is provided support and compensates.
Description of drawings
Fig. 1 is that the mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type wind generator system is electrically connected sketch map;
Fig. 2 is a megawatt-stage direct-drive type indirect AC convertor prime power unit electrical structure sketch map;
Fig. 3 is a H bridge rectification module sketch map;
Fig. 4 is a power cell H bridge rectification module series system sketch map;
Fig. 5 is and the supporting use connected mode of heterogeneous mouse cage asynchronous generator sketch map;
Fig. 6 is A, B, C three phase network side inversion module control block diagram;
Fig. 7 is the mouse cage asynchronous generating pusher side of middle pressure controller chassis figure.
Embodiment
The mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type wind generator system is pressed mouse cage asynchronous generator M, MW class four-quadrant indirect AC convertor, phase shifting transformer in comprising, mechanical driving part adopts no step-up gear design.
See Fig. 1, MW class four-quadrant indirect AC convertor is the chain structure that a plurality of power unit cascades are formed, and every is a unsteady flow chain mutually; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase, and the stator winding that the other end of three unsteady flow chains is corresponding with mouse cage asynchronous generator links to each other; Mouse cage asynchronous generator sends three-phase alternating current; Power cell rectification module rectification in every phase unsteady flow chain converts direct current to; Inversion module through this power cell converts direct current to alternating current again, and the three-phase alternating current output of each power cell is connected to the secondary winding of the corresponding phase of phase shifting transformer again in each unsteady flow chain; Be coupled to former limit three phase windings of phase shifting transformer through the iron core of phase shifting transformer, the former limit A of transformer, B, C three phase windings are connected with A, B, the C three of electrical network 1 respectively, realize carrying the mesohigh electric energy to electrical network 1.
Mouse cage asynchronous generator output voltage grade has determined the quantity of the power cell that every phase is connected, and whenever be made up of n power cell, so megawatt-stage direct-drive type indirect AC convertor comprises 3n power cell altogether.Need three unsteady flow chains altogether with pressing the supporting four-quadrant indirect AC convertor of mouse cage asynchronous generator in the three-phase; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase; The other end of three unsteady flow chains links to each other through filter reactor (if the stator leakage reactance of generator is big and the du/dt tolerance is strong, filter reactor can the adopt) stator winding corresponding with the mouse cage asynchronous generator M of middle pressure.
See Fig. 2; With the matching used megawatt level direct drive type AC-DC-AC of middle pressure squirrel-cage asynchronism generator type current transformer; Comprise some power cells, each power cell supports capacitor C, copped wave brake module 3 and three-phase inversion module 4 by H bridge rectification module 2, direct current and forms.H bridge rectification module is to become two half-bridge structures by the full-control type set of power switches; Comprise two full control device for power switching on each half-bridge; The tie point of two full control device for power switching is wherein controlled the equal parallelly connected fly-wheel diode of device for power switching entirely as one of two inputs of H bridge rectification module on each half-bridge; The copped wave brake module is composed in series by a full control device for power switching and a brake resistance, wherein controls device for power switching and the equal parallelly connected fly-wheel diode of brake resistance entirely; The three-phase inversion module is to become three half-bridge structures by full control set of power switches; Comprise two full control device for power switching on each half-bridge; The tie point of two full control device for power switching is wherein controlled the equal parallelly connected fly-wheel diode of device for power switching entirely as one of three ac output ends of three-phase inversion module on each half-bridge.Two dc output ends of each H bridge rectification module link to each other respectively with the two poles of the earth that direct current supports electric capacity; Connect the brake module of being connected with brake resistance by full control device for power switching then, connect the dc terminal of three-phase inversion module again, the three-phase alternating current output of last three-phase inversion module connects the three-phase filter reactor.
See Fig. 3, rectification module adopts the H bridge construction, and the tie point of two full control device for power switching is defined as input 1 and input 2 respectively as one of two inputs of H bridge circuit on each half-bridge.
See Fig. 4, two inputs 1 of n H bridge rectification module alternately are connected with 2 successively, constitute a unsteady flow chain, as the phase in the three-phase.Need three unsteady flow chains altogether with pressing the supporting four-quadrant indirect AC convertor of mouse cage asynchronous generator M in the three-phase; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase; The other end of three unsteady flow chains links to each other through filter reactor (if the stator leakage reactance of generator is big and the du/dt tolerance is strong, filter reactor can the adopt) stator winding corresponding with the mouse cage asynchronous generator of middle pressure.
See Fig. 5, MW class four-quadrant indirect AC convertor and the supporting use of heterogeneous mouse cage asynchronous generator.When having the mouse cage asynchronous generator of middle pressure of M cover threephase stator winding like application; Then supporting with it MW class four-quadrant indirect AC convertor needs 3M unsteady flow chain altogether; One end of per three unsteady flow chains is joined together to form the star neutral point of a three-phase; The other end of per three unsteady flow chains links to each other through filter reactor (if the stator leakage reactance of generator is big and the du/dt tolerance is strong, filter reactor can the adopt) stator winding corresponding with generator.
See Fig. 6, it is that interior ring, Voltage loop are the double circle structure of outer shroud that electric current is adopted in the control of grid side inversion module, and Voltage loop (outer shroud) is a controlled target to keep the unit direct voltage constant.Electric current loop (interior ring) is given with quick follow current, realizes that inverter current sineization, power-factor angle can be adjusted to controlled target.
Grid side three-phase inversion current i ga, igb, igc obtain the active current igq and the reactive current igd of decoupling zero through Clarke conversion and Park conversion.The given igq* of active current of active current igq and Voltage loop output relatively exports ugq after active current adjuster PI handles
,The given igd* of the reactive current of reactive current igd and default relatively exports ugd after reactive current adjuster PI handles.Characterize the ugq and the ugd that characterizes reactive current of active current, generate the modulation voltage ug under the two phase rest frames through the Park inverse transformation
αAnd ug
β, generate the PWM drive signal PWMg1 ~ PWMgn of corresponding full control device for power switching on the inversion module again through SVPWM.
The given igq* of active current of Voltage loop output is the degenerative output of voltage close loop, always makes current inner loop follow adjusting to voltage given amount direction.But the given igd* of reactive current is the set amount according to system's needs, in order to regulate the idle content to the grid side inversion.What the Park inverse transformation generated is sinusoidal modulation signal, and therefore, outer voltage can guarantee voltage constant, and current inner loop can realize the artificial adjusting of inverter current sineization and inversion idle component.
See Fig. 7, the generator side rectifier is mainly accomplished is that to follow the power or the electric current of wind power generation master control system fast given, realizes the rectified current sineization, rectified power factor angle is adjustable.Generating pusher side three phase rectifier current i ma, imb, imc be through Clarke conversion and Park conversion, gained merit, the current i mq and the imd of idle decoupling zero.Active current imq with from the given imq* of the active current of master control system relatively, handle the back through active current adjuster PI and export umq
,The given imd* of the reactive current of reactive current imq and default relatively exports umd after reactive current adjuster PI handles.Characterize the umq and the umd that characterizes reactive current of active current, generate the modulation voltage um under the two phase rest frames through the Park inverse transformation
αAnd um
βGenerate generating pusher side ABC three-phase modulations voltage uma, umb, umc through modulation wave generator again; Three-phase modulations voltage uma, umb, umc and phase shift carrier wave ratio separately generate the PWM drive signal of the corresponding IGBT of each each rectification module of phase of pusher side, and A is PWMma1 ~ PWMman mutually; B is PWMmb1 ~ PWMmbn mutually, and C is PWMmc1 ~ PWMmcn mutually.But the given imd* of reactive current is the set amount according to system's needs, in order to regulate the power-factor angle of pusher side rectification.What the Park inverse transformation generated is sinusoidal modulation signal, and electric current loop can be realized the artificial adjusting at pusher side rectified current sineization and pusher side rectified power factor angle.
During directly driving, blade press mouse cage asynchronous generator to rotate; When in fundamental frequency that the motor side of AC-DC-AC type current transformer produces is lower than, pressing the pairing electric frequency of the current rotating speed of mouse cage asynchronous generator (slip frequency of generator is for negative); Mouse cage asynchronous generator is operated in generating state, through the slip of control generator and the power output that stator voltage can be controlled generator; The alternating current that mouse cage asynchronous generator sends is converted into H bridge rectification module direct current separately by each H bridge rectification module respectively; The three-phase inversion module of H bridge rectification module direct current separately through separately transforms into the three-phase main-frequency alternating current and is applied on the corresponding secondary winding of phase shifting transformer; Thereby be coupled to former limit three phase windings of phase shifting transformer through the iron core of phase shifting transformer; The former limit A of transformer, B, C three phase windings are connected with A, B, the C three of electrical network respectively, realize to the electrical network transmission of electric energy.When the voltage that supports electric capacity when the direct current that causes certain or some power cells because of any reason (such as wind-force is excessive) surpasses the threshold value of regulation; The automatic conducting of full control device for power switching in the copped wave brake module; Consume superfluous energy through brake resistance, the voltage that makes direct current support electric capacity is limited in being no more than the threshold value of regulation.
Because megawatt level direct drive type AC-DC-AC type current transformer adopts H bridge serial connection technology and many secondary winding phase shifting transformer isolation technology, makes wind generator system can adopt the middle pressure of various electric pressures even the mouse cage asynchronous generator of high pressure to become possibility.Because the three-phase or the heterogeneous mouse cage asynchronous generator of pressure even high pressure in adopting, and supporting with it AC-DC-AC type current transformer make the more powerful wind generator system of realization become possibility; Because it is more easy that AC-DC-AC type current transformer and wind power generation acc power quite, not direct coupled relation between employing, wind-driven generator and the electrical network of copped wave brake module, do not make this wind generator system realization low-voltage pass through function; Because the three-phase inversion module of AC-DC-AC type current transformer and direct current support the key element that capacitance structure has constituted dynamic reactive generator main circuit topology; But therefore this wind generator system double as dynamic reactive generator also can carry out in real time electrical network idle, compensation effectively.
Claims (4)
1. the mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type wind generator system; It is characterized in that; Comprise mouse cage asynchronous generator, MW class four-quadrant indirect AC convertor, phase shifting transformer; Described MW class four-quadrant indirect AC convertor is the chain structure that a plurality of power unit cascades are formed, and every is a unsteady flow chain mutually; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase, and the stator winding that the other end of three unsteady flow chains is corresponding with mouse cage asynchronous generator links to each other; The three-phase alternating current that mouse cage asynchronous generator sends; Power cell rectification module rectification in every phase unsteady flow chain converts direct current to; Inversion module through this power cell converts direct current to alternating current again, and the three-phase alternating current output of each power cell is connected to the secondary winding of the corresponding phase of phase shifting transformer again in each unsteady flow chain; Be coupled to former limit three phase windings of phase shifting transformer through the iron core of phase shifting transformer, the former limit A of transformer, B, C three phase windings are connected with A, B, the C three of electrical network respectively.
2. the mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type according to claim 1 wind generator system; It is characterized in that the three-phase output end of described mouse cage asynchronous generator directly is connected with the corresponding unsteady flow mutually of MW class four-quadrant indirect AC convertor chain power cell rectification module.
3. the mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type according to claim 1 wind generator system is characterized in that, presses mouse cage asynchronous generator during described mouse cage asynchronous generator adopts.
4. the mouse cage asynchronous generator AC-DC-AC of megawatt-stage direct-drive type according to claim 1 wind generator system; It is characterized in that; The power cell of said unsteady flow chain is supported electric capacity, copped wave brake module and three-phase inversion module and is connected to form successively by input side to outlet side by H bridge rectification module, direct current; N H bridge rectification module is connected to form chain structure in each unsteady flow chain; One end of three unsteady flow chains is joined together to form the star neutral point of this three-phase, and the stator winding that the other end of three unsteady flow chains is corresponding with mouse cage asynchronous generator links to each other; The inversion module three-phase alternating current output of each power cell is connected to the secondary winding of the corresponding phase of phase shifting transformer in every chain.
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| CN201120436977XU CN202455089U (en) | 2011-11-07 | 2011-11-07 | Megawatt-grade direct-driven type mouse cage asynchronous generator AC-DC-AC wind power generation system |
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| CN201120436977XU CN202455089U (en) | 2011-11-07 | 2011-11-07 | Megawatt-grade direct-driven type mouse cage asynchronous generator AC-DC-AC wind power generation system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386633A (en) * | 2011-11-07 | 2012-03-21 | 荣信电力电子股份有限公司 | Megawatt direct-drive alternating current-direct current-alternating current wind power generating system with squirrel-cage asynchronous generator |
| EP2768135A1 (en) * | 2013-02-15 | 2014-08-20 | ABB Technology AG | A hydroelectric power generation apparatus. |
| CN107623393A (en) * | 2017-09-08 | 2018-01-23 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of pressure-adjustable high-speed permanent magnetic electricity generation system |
| CN108011527A (en) * | 2017-12-27 | 2018-05-08 | 北京金风科创风电设备有限公司 | Converter, direct-drive wind generating set and power transmission system |
| CN108631355A (en) * | 2017-12-26 | 2018-10-09 | 北京金风科创风电设备有限公司 | Converter, electric control system and wind farm power transmission system |
| CN112448593A (en) * | 2019-08-27 | 2021-03-05 | 中车株洲电力机车研究所有限公司 | Traction converter system |
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2011
- 2011-11-07 CN CN201120436977XU patent/CN202455089U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386633A (en) * | 2011-11-07 | 2012-03-21 | 荣信电力电子股份有限公司 | Megawatt direct-drive alternating current-direct current-alternating current wind power generating system with squirrel-cage asynchronous generator |
| EP2768135A1 (en) * | 2013-02-15 | 2014-08-20 | ABB Technology AG | A hydroelectric power generation apparatus. |
| CN107623393A (en) * | 2017-09-08 | 2018-01-23 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of pressure-adjustable high-speed permanent magnetic electricity generation system |
| CN108631355A (en) * | 2017-12-26 | 2018-10-09 | 北京金风科创风电设备有限公司 | Converter, electric control system and wind farm power transmission system |
| CN108011527A (en) * | 2017-12-27 | 2018-05-08 | 北京金风科创风电设备有限公司 | Converter, direct-drive wind generating set and power transmission system |
| CN112448593A (en) * | 2019-08-27 | 2021-03-05 | 中车株洲电力机车研究所有限公司 | Traction converter system |
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