CN107332484A - A kind of converters - Google Patents
A kind of converters Download PDFInfo
- Publication number
- CN107332484A CN107332484A CN201710792551.XA CN201710792551A CN107332484A CN 107332484 A CN107332484 A CN 107332484A CN 201710792551 A CN201710792551 A CN 201710792551A CN 107332484 A CN107332484 A CN 107332484A
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- electric engine
- feedback electric
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- double feedback
- rotor
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- 238000004804 winding Methods 0.000 claims abstract description 53
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 239000003381 stabilizer Substances 0.000 claims abstract description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 6
- 238000012913 prioritisation Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000001360 synchronised effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000819 phase cycle Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
-
- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of converters, including transmission mechanism and double feedback electric engine, the left end of the transmission mechanism is connected by rotating shaft with wind energy conversion system, the output end of the transmission mechanism is connected by control line with double feedback electric engine, and be connected in the signal end of double feedback electric engine by power winding with power network, the output end of the double feedback electric engine is connected by controling winding with PWM rectifier, the PWM rectifier is connected using series parallel structure with power network, the double feedback electric engine uses Wound-rotor asynchronous generator, the left end of double feedback electric engine is provided with stator winding, the right-hand member of the double feedback electric engine is connected with resistance and voltage-stabiliser tube respectively by rotor windings, the control end of the voltage-stabiliser tube is connected in parallel with rectifier, so that the container of relative total power converter is greatly reduced, improve the reliability of system operation, it is the prioritization scheme of variable speed constant frequency generator in wind-power electricity generation.
Description
Technical field
The present invention relates to converter technical field, specially a kind of converters.
Background technology
With expanding economy, environmental protection consciousness constantly strengthens, and all kinds of by representative of wind energy of development and utilization can be again
The raw energy has turned into the strategic choice that the mankind solve vital conjuncture.Wind generating technology is most ripe development of renewable energy at present
One of power technology, is also the new energy power generation technology of many state key exploitations：
(1) current wind-force technology is realized using constant-speed and constant-frequency unit, but constant-speed and constant-frequency unit can only be fixed and operated in
Highest operational efficiency is can be only achieved during a certain rotating speed, wind energy conversion system can deviate from optimum operation rotating speed when wind speed changes, cause fortune
Line efficiency declines.The quality of power supply of asynchronous Wind turbine output is poor, and power factor is relatively low；
(2) the running status adjustment of each wind energy conversion system all can the very big shadow of local area power network generation in existing technical scheme
Ring, wind speed, the randomness of wind direction, unstability can make wind energy conversion system output voltage, frequency, power change.
The content of the invention
In order to overcome the shortcomings of prior art, the present invention provides a kind of converters, using variable speed constant frequency
Wind power generating set, effectively alleviates the stress even eliminated in drive chain and is vibrated with torque, and improve efficiency of generating unit so that
Wind energy conversion system can keep Effec-tive Function when large-scale wind speed changes, and can effectively solve the problem that the problem of background technology is proposed.
The technical solution adopted for the present invention to solve the technical problems is：A kind of converters, including driver
Structure and double feedback electric engine, the left end of the transmission mechanism are connected by rotating shaft with wind energy conversion system, and the output end of the transmission mechanism is led to
Cross control line with double feedback electric engine to be connected, and be connected in the signal end of double feedback electric engine by power winding with power network, it is described double
The output end of generating aid is connected by controling winding with PWM rectifier, and the PWM rectifier uses series parallel structure and power network
It is connected, the double feedback electric engine uses Wound-rotor asynchronous generator, the left end of double feedback electric engine is provided with stator winding, it is described double
The right-hand member of generating aid is connected with resistance and voltage-stabiliser tube respectively by rotor windings, and the control end and rectifier of the voltage-stabiliser tube are simultaneously
Connection connection.
As a kind of technical scheme for having a choosing of the present invention, the rotor windings are internally provided with rotor number of pole-pairs interface, institute
The output end for stating rotor number of pole-pairs interface is connected by controling winding frequency line with bidirectional power converter, the bidirectional power
The output end of converter point three tunnels are connected with power winding frequency line, and the output end of the power winding frequency line is and rotor
The power winding number of pole-pairs interface on winding surface is connected.
As a kind of technical scheme for having a choosing of the present invention, the transmission mechanism predominantly drives gear-box to turn using wind energy conversion system
Act as power resources.
As a kind of technical scheme for having a choosing of the present invention, the input of the double feedback electric engine is also associated with step-up transformer,
And double pwm converters are provided at both ends with step-up transformer, and it is also associated with crystal oscillator between double pwm converters.
As a kind of technical scheme for having a choosing of the present invention, the quantity of the PWM rectifier is 12, and 12 PWM
Rectifier is connected in parallel between double feedback electric engine and power network line.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention is simple in construction using actuator circuit, and control method is ripe.The alternating current that generator is sent passes through
Current rectifying and wave filtering circuit is converted to direct current, then by PWM voltage source inverters, output voltage, frequency, phase are consistent with power network
Alternating current, and the active and reactive power that can be exported with control system, the torque of regulator generator, rotating speed, make blower fan work
In optimum state；
(2) doubly-fed motor of the invention by installation, using the design feature of wound rotor asynchronous motor itself, by electricity
The stator of motivation is directly coupled on three-phase symmetrical common frequency power network, and wound rotor is powered using AC frequency conversion power supply, and is adopted
Amplitude, frequency, phase and the phase sequence of rotor current are controlled with corresponding control strategy.Due to motor be respectively by it is fixed,
What rotor individually fed and worked, controller absorbs energy from power network and gives rotor windings.When motor speed is higher than synchronous rotational speed
When, motor operation is in supersynchronous state, when the rotation angular frequency and the rotation angular frequency opposite direction of rotor windings of stator winding
Rotation, now, stator current is with rotor current phase sequence on the contrary, controller absorbs energy from rotor windings gives power network.Work as rotor
When the rotation angular frequency of winding is 0, motor is run with synchronous rotational speed, and now rotor-exciting is changed into DC excitation from AC excitation,
The running status of motor is identical with common synchronous motor so that the container with respect to total power converter is greatly reduced, and is carried
The high reliability of system operation, is the prioritization scheme of variable speed constant frequency generator in wind-power electricity generation.
(3) Principles of Regulation of brushless dual-feed motor of the invention in wind generator system are with there is the basic phase of brush double feedback electric engine
Together, the frequency of exciting current is adjusted according to rotation speed of fan change；By changing the amplitude and phase of exciting current, to capture most
Big wind energy, while active and reactive power regulation is realized, it is practical.
Brief description of the drawings
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is double feedback electric engine system structure diagram of the invention；
Fig. 3 is double pwm converter attachment structure schematic diagrams of the invention；
Fig. 4 is rotor winding structure schematic diagram of the invention.
In figure：1- transmission mechanisms；2- double feedback electric engines；3- wind energy conversion systems；4- power networks；5-PWM rectifiers；6- controling windings；7-
Power winding；8- stator winding；9- resistance；10- rotor windings；11- voltage-stabiliser tubes；12- rectifiers；13- rotor number of pole-pairs interfaces；
14- controling winding frequency lines；15- bidirectional power converters；16- power winding frequency lines；17- power winding number of pole-pairs interfaces；
18- step-up transformers；The double pwm converters of 19-；20- crystal oscillators.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The explanation of following embodiment is refer to the attached drawing, can be to the specific embodiment implemented to the example present invention.
Direction and position term that the present invention is previously mentioned, such as " on ", " in ", " under ", "front", "rear", "left", "right", " interior ", "
Outside ", " side " etc., is only the direction and position with reference to annexed drawings.Therefore, the direction and position term used is to illustrate
And understand the present invention, and it is not used to the limitation present invention.
Embodiment：
As depicted in figs. 1 and 2, the invention provides a kind of converters, including transmission mechanism 1 and double feedback electric engine
2, the left end of the transmission mechanism 1 is connected by rotating shaft with wind energy conversion system 3, and the transmission mechanism 1 predominantly utilizes wind energy conversion system band
Moving gear case is rotated as power resources, and the output end of the transmission mechanism 1 is connected by control line with double feedback electric engine 2, and
Be connected in the signal end of double feedback electric engine 2 by power winding 7 with power network 4, the output end of the double feedback electric engine 2 by control around
Group 6 is connected with PWM rectifier 5, and the PWM rectifier 5 is connected using series parallel structure with power network 4, the PWM rectifier
5 quantity is 12, and 12 PWM rectifiers 5 are connected in parallel between double feedback electric engine 2 and the circuit of power network 4, it is described
In double PWM rectifiers 9, PWM inversion transformation technique relative maturities, and the PWM rectifier 9 of grid side is as main with universal frequency converter
Discrepancy, determine energy can feedback, feedback quality how, electric operation when whether power factor adjustable etc. that key is asked
Topic.For PWM rectifier 9, switch bridge can turn off igbt (IGBT) composition using voltage control, pass through high frequency
A series of rate switch switching so that input side rectifier line voltage is continuous switching pulses, its fundamental wave component is defeated with power network
Enter the sinusoidal voltage of voltage same frequency.When switching frequency is higher, the amplitude of low order industrial frequency harmonic is approximately zero, therefore rectifier
The sine degree of input side electric current is higher.By adjusting order and the time of switch switching, the phase of input side electric current can be changed, from
And realize power, the regulation of power factor.
As shown in Fig. 2 the double feedback electric engine 2 uses Wound-rotor asynchronous generator, it is fixed to be provided with the left end of double feedback electric engine 2
Sub- winding 8, the right-hand member of the double feedback electric engine 2 is connected with resistance 9 and voltage-stabiliser tube 11 respectively by rotor windings 10, the voltage stabilizing
The control end of pipe 11 is connected in parallel with rectifier 12, and rotor current control technology is to control coiling by converters
One technology of formula asynchronous motor rotor electric current, in wind power system, changes according to outside wind speed and changes the outer of asynchronous machine
Connecting resistance value, makes rotor current track the set-point of power governor output, keeps rotor current constant, so that stable output work
Rate.Rotor current controller is installed with generator coaxle, and constitutes electric loop with rotor windings.Main circuit is main by external electricity
Resistance, switching device etc. are constituted, and are connected by three-phase commutation bridge with generator amature circuit.Switching device is provided by control unit
Pwm signal constantly open and turn off, the average value of adjustment each cycle outer meeting resistance access reaches the mesh of the given electric current of tracking
's.Install additional rotor current controller asynchronous wind driven generator group be mainly characterized by it is simple in construction, and can be within the specific limits
Realize variable speed constant frequency and power adjusting.
As shown in figure 4, the rotor windings 10 are internally provided with rotor number of pole-pairs interface 13, the rotor number of pole-pairs interface
13 output end is connected by controling winding frequency line 14 with bidirectional power converter 15, the bidirectional power converter 15
Output end point three tunnels are connected with power winding frequency line 16, and the output end of the power winding frequency line 16 is and rotor windings
The power winding number of pole-pairs interface 17 on 4 surfaces is connected, and when motor speed is equal to synchronous rotational speed, controling winding excitation is by exchanging
Excitation is changed into DC excitation, and the running status of motor is identical with common synchronous motor.Brushless dual-feed motor is sent out in wind-force
Principles of Regulation in electric system adjust the frequency of exciting current according to rotation speed of fan change with there is brush double feedback electric engine essentially identical
Rate；By changing the amplitude and phase of exciting current, to capture maximal wind-energy, while realizing active and reactive power regulation.
As shown in figure 3, the input of the double feedback electric engine 2 is also associated with step-up transformer 18, and in step-up transformer 18
Be provided at both ends with double pwm converters 19, and be also associated between double pwm converters 19 crystal oscillator 20, the rotor-side conversion
Device uses overmodulation technique to improve the effect of not off-grid excitation con-trol, its maximum excitation voltage under ovennodulation operation
1.35 times of rated output voltage are reached, overmodulation technique, its maximum controlling voltage are also all used to power network side converter
Reach 1.5 times of nominal control volatge.Traditional double-loop control strategy and the control with feedforward are respectively adopted before failure generation
Policy control power network side converter processed, DC-link voltage setting value is 1200V.Using based on stator magnetic linkage oriented vector controlled
Algorithm control rotor side converter realizes generated power and reactive power uneoupled control.
In summary, the main characteristic of the invention lies in that：
(1) present invention is simple in construction using actuator circuit, and control method is ripe.The alternating current that generator is sent passes through
Current rectifying and wave filtering circuit is converted to direct current, then by PWM voltage source inverters, output voltage, frequency, phase are consistent with power network
Alternating current, and the active and reactive power that can be exported with control system, the torque of regulator generator, rotating speed, make blower fan work
In optimum state；
(2) doubly-fed motor of the invention by installation, using the design feature of wound rotor asynchronous motor itself, by electricity
The stator of motivation is directly coupled on three-phase symmetrical common frequency power network, and wound rotor is powered using AC frequency conversion power supply, and is adopted
Amplitude, frequency, phase and the phase sequence of rotor current are controlled with corresponding control strategy.Due to motor be respectively by it is fixed,
What rotor individually fed and worked, controller absorbs energy from power network and gives rotor windings.When motor speed is higher than synchronous rotational speed
When, motor operation is in supersynchronous state, when the rotation angular frequency and the rotation angular frequency opposite direction of rotor windings of stator winding
Rotation, now, stator current is with rotor current phase sequence on the contrary, controller absorbs energy from rotor windings gives power network.Work as rotor
When the rotation angular frequency of winding is 0, motor is run with synchronous rotational speed, and now rotor-exciting is changed into DC excitation from AC excitation,
The running status of motor is identical with common synchronous motor so that the container with respect to total power converter is greatly reduced, and is carried
The high reliability of system operation, is the prioritization scheme of variable speed constant frequency generator in wind-power electricity generation.
(3) Principles of Regulation of brushless dual-feed motor of the invention in wind generator system are with there is the basic phase of brush double feedback electric engine
Together, the frequency of exciting current is adjusted according to rotation speed of fan change；By changing the amplitude and phase of exciting current, to capture most
Big wind energy, while active and reactive power regulation is realized, it is practical.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the claim involved by limitation.
Claims (5)
1. a kind of converters, it is characterised in that：Including transmission mechanism (1) and double feedback electric engine (2), the transmission mechanism
(1) left end is connected by rotating shaft with wind energy conversion system (3), and the output end of the transmission mechanism (1) passes through control line and duplex feeding
Machine (2) is connected, and is connected in the signal end of double feedback electric engine (2) by power winding (7) with power network (4), the duplex feeding
The output end of machine (2) is connected by controling winding (6) with PWM rectifier (5), and the PWM rectifier (5) uses connection in series-parallel knot
Structure is connected with power network (4), and the double feedback electric engine (2) uses Wound-rotor asynchronous generator, is set in the left end of double feedback electric engine (2)
Have a stator winding (8), the right-hand member of the double feedback electric engine (2) by rotor windings (10) respectively with resistance (9) and voltage-stabiliser tube (11)
It is connected, control end and the rectifier (12) of the voltage-stabiliser tube (11) are connected in parallel.
2. a kind of converters according to claim 1, it is characterised in that：Set inside the rotor windings (10)
Be equipped with rotor number of pole-pairs interface (13), the output end of the rotor number of pole-pairs interface (13) by controling winding frequency line (14) with
Bidirectional power converter (15) is connected, three tunnels of output end point and the power winding frequency line of the bidirectional power converter (15)
(16) it is connected, the power winding number of pole-pairs of the output end of the power winding frequency line (16) with rotor windings (4) surface
Interface (17) is connected.
3. a kind of converters according to claim 1, it is characterised in that：The transmission mechanism (1) is mainly
Drive gear-box to rotate by the use of wind energy conversion system and be used as power resources.
4. a kind of converters according to claim 1, it is characterised in that：The input of the double feedback electric engine (2)
End is also associated with step-up transformer (18), and is provided at both ends with double pwm converters (19) in step-up transformer (18), and double
Crystal oscillator (20) is also associated between pwm converter (19).
5. a kind of converters according to claim 1, it is characterised in that：The quantity of the PWM rectifier (5)
For 12, and 12 PWM rectifiers (5) are connected in parallel between double feedback electric engine (2) and power network (4) circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710792551.XA CN107332484A (en) | 2017-09-05 | 2017-09-05 | A kind of converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710792551.XA CN107332484A (en) | 2017-09-05 | 2017-09-05 | A kind of converters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107332484A true CN107332484A (en) | 2017-11-07 |
Family
ID=60204779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710792551.XA Pending CN107332484A (en) | 2017-09-05 | 2017-09-05 | A kind of converters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107332484A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347214A (en) * | 2018-04-04 | 2018-07-31 | 苏州南海道电子科技有限公司 | A kind of suspended type new energy generation technology |
| EP3484007A1 (en) * | 2017-11-09 | 2019-05-15 | General Electric Company | Dfig converter overmodulation |
| WO2019195503A1 (en) * | 2018-04-04 | 2019-10-10 | General Electric Company | Dfig converter with active filter |
| CN111245020A (en) * | 2020-03-12 | 2020-06-05 | 上海电气风电集团股份有限公司 | Double-fed wind power generation system and power generation method |
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| CN201122927Y (en) * | 2007-11-30 | 2008-09-24 | 华南理工大学 | Rotor current controller |
| US20160177924A1 (en) * | 2014-12-23 | 2016-06-23 | Delta Electronics,Inc | Wind power generation control device and wind power generation system having the same |
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2017
- 2017-09-05 CN CN201710792551.XA patent/CN107332484A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122927Y (en) * | 2007-11-30 | 2008-09-24 | 华南理工大学 | Rotor current controller |
| US20160177924A1 (en) * | 2014-12-23 | 2016-06-23 | Delta Electronics,Inc | Wind power generation control device and wind power generation system having the same |
Non-Patent Citations (2)
| Title |
|---|
| 伍小杰 等: "转子电流混合控制的并网型绕线式异步风力发电机系统", 《太阳能学报》 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3484007A1 (en) * | 2017-11-09 | 2019-05-15 | General Electric Company | Dfig converter overmodulation |
| CN108347214A (en) * | 2018-04-04 | 2018-07-31 | 苏州南海道电子科技有限公司 | A kind of suspended type new energy generation technology |
| WO2019195503A1 (en) * | 2018-04-04 | 2019-10-10 | General Electric Company | Dfig converter with active filter |
| US10778112B2 (en) | 2018-04-04 | 2020-09-15 | General Electric Company | DFIG converter with active filter |
| CN111245020A (en) * | 2020-03-12 | 2020-06-05 | 上海电气风电集团股份有限公司 | Double-fed wind power generation system and power generation method |
| WO2021180113A1 (en) * | 2020-03-12 | 2021-09-16 | 上海电气风电集团股份有限公司 | Doubly-fed wind power generation system and power generation method therefor |
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