CN100486075C - Three-level medium voltage converter for megawatt wind power generation - Google Patents
Three-level medium voltage converter for megawatt wind power generation Download PDFInfo
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- CN100486075C CN100486075C CNB2007100717419A CN200710071741A CN100486075C CN 100486075 C CN100486075 C CN 100486075C CN B2007100717419 A CNB2007100717419 A CN B2007100717419A CN 200710071741 A CN200710071741 A CN 200710071741A CN 100486075 C CN100486075 C CN 100486075C
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- 238000010248 power generation Methods 0.000 title claims description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 230000000694 effects Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000341910 Vesta Species 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses one megawatt wind motor three level transducer, which comprises three phase inductance, capacitor, motor three-level transducer, direct current filter capacitor, network side three-level alternating and parallel inductance and capacitor, wherein, the motor side three level transducer is connected to three level transducer through direct mother line; the wind motor connects three phase capacitor to one end of inductance with other end connected to the transducer; the direct current output end is connected to three level transducer direct mother line through filter capacitor.
Description
(1) technical field
The present invention relates to technical field of wind power generation, be specifically related to a kind of wind-force generating converter.
(2) background technology
Wind energy more and more is subjected to people's attention as a kind of cleaning, non-pollution of renewable energy, and wind power generation will become one of new forms of energy of 21 century maximum-norm exploitation.Present wind-driven generator single-machine capacity constantly increases, and variable speed constant frequency, Variable Pitch type wind energy conversion system have occupied leading position gradually.Gear box is to transship and the higher parts of premature damage rate in the MW grade wind driven generator unit at present, and since last century Mo, the wind-powered electricity generation unit manufacturer with headed by the German Enercon has released a series of non-gear box direct-drive wind power system.The mode that this unit adopts multistage aerogenerator and impeller directly to be of coupled connections and to drive, remove this legacy device of gear box from, multiple advantage such as high efficiency has very big development space when possessing low noise, improve unit durability, reduce unit volume, reducing operation expense, lower noise, low wind speed in wind energy conversion system development from now on.Can estimate that the direct-drive wind power system of saving gear box will become the main direction of following wind generating technology development.
The grid-connected converter power grade and the generating set of direct-drive aerogenerator group are suitable, the electric energy that generator sends all needs to be transformed to by current transformer the alternating current feed-in electrical network of frequency, voltage constant, and, make it to realize maximum power output by electromagnetic torque is controlled in the control of motor side current transformer electric current.Compare with the wind generator system that motor directly is incorporated into the power networks, the use of current transformer between generating set and electrical network, realized the isolation between generating set and electrical network, coupled problem between rotating speed and the mains frequency will be solved, also avoided to a certain extent because of power network fluctuation to generating set stable operation adverse effect.
In the double feedback electric engine system, because power converter is positioned at rotor-side, only handle slip power, power converter volume power is about 1/3rd of its generator capacity, and also belongs to low volage current transformer, so the cost of current transformer, volume reduce greatly.Because the double feedback electric engine system, objectively need low pressure and power converter that can four quadrant running.Traditional friendship-straight-hand over two level current transformers with its superior performance is generally adopted in the current transformer product of present different wind-powered electricity generation producer, as shown in Figure 1.What do in this respect the most successfully is the Vestas company of Hispanic Gamesa company and Denmark.
In the permanent magnet direct-drive variable-speed constant-frequency wind power generation system, magneto links to each other with electrical network by the power converter of full capacity, realizes variable speed constant frequency generator.It is needed to be a full power convertor.The SEG company of Hispanic MADE company and Germany adopts main circuit structure as shown in Figure 2, be that energy arrives DC side via uncontrollable AC-DC current transformer, because change of wind velocity, caused the fluctuation of dc voltage, adopting booster converter that voltage is fixed to the dc bus side of DC-AC current transformer, is to be incorporated into the power networks after meeting the alternating current of mains frequency by the inversion of DC-AC current transformer then.The cost of sort circuit structure is very low, but it does not possess the ability of four quadrant running, thereby is in operation and is very restricted.The power converter that possesses two PWW controls of four quadrant running ability has then obtained good application (as shown in Figure 3) in the blower fan giant Enercon of Germany company.This also is that a kind of technology is the most ripe, move the most reliable, accommodation is technical scheme the most widely, therefore four-quadrant in service being widely adopted, but because the input and output voltage of 690VAC, make the busbar voltage of DC side use about 1100V mostly, and the switching device that uses all is 1700V, this just makes the fail safe of converter system and reliability reduce a lot.At present, domesticly be in the starting stage generally with the research and the manufacture view of power converter, especially 2MW and above power used for wind power generation power converter blank out especially at megawatt level wind power generation.Because MW class variable speed constant frequency wind-powered electricity generation control panel is the external import of the long-term dependence of power converter especially, is restricting China's wind-powered electricity generation industrialization process.Development has the wind power current transformer of the above power grade of 2MW of independent intellectual property right, not only reduce the cost of wind power equipment greatly, and can improve the competitiveness of China in world's wind-powered electricity generation industry, and being China's wind power technology outlet, the status that is lifted on world's wind-power market lays the foundation.According to experience in the past, volage current transformer was the most economical during power grade used above 2MW.
The PowerFlex 7000 of Rockwell company is the current source converter (as shown in Figure 4) that adopts SGCT, and it belongs to middle volage current transformer, but near its performance need low speed and zero-speed improves, and adopts the cost of this switching device of SGCT also very high.Because various factorss such as control method and hardware designs, the voltage-type current transformer is used more extensive.The voltage-type AC-DC-AC converter, have excellent characteristics such as simple in structure, that harmonic content is few, power factor is adjustable, can significantly improve the output quality of power supply, and this structure has realized separating of net side and motor side fully by the dc bus lateral capacitance, also is that of present variable-speed constant-frequency wind power generation represents direction.Therefore adopt the middle volage current transformer of voltage-type to become a kind of optimal selection.For this reason, the utility model discloses a kind of especially main circuit of the used for wind power generation three level volage current transformers of the above power grade of 2MW of MW class that is used for.
(3) summary of the invention
The purpose of this utility model is to provide a kind of power converter that is used for the used for wind power generation of the above power grade of MW class.
The purpose of this utility model is achieved in that it is to be connected to form with form back-to-back by dc bus by volage current transformer in two identical in structure three level, volage current transformer comprises three pole reactor, three phase capacitance, generating pusher side three-level current transformer, DC side filter capacitor, net side three-level current transformer and three-phase grid inductance and three-phase filter capacitor in three level, and generating pusher side three-level current transformer and net side three-level current transformer are connected with form back-to-back by dc bus; Be parallel to an end of three pole reactor after the wind-driven generator connection three phase capacitance, the other end of three pole reactor connects generating pusher side three-level current transformer, the dc output end of generating pusher side three-level current transformer connects the dc bus side of net side three-level current transformer by the DC side filter capacitor, the three-phase alternating current output of net side three-level current transformer connects the three-phase grid inductance, with link step-up transformer after the three-phase filter capacitor is in parallel, step-up transformer connects electrical network.
The utility model also has some architectural features like this:
1, the described generating pusher side three-level current transformer three-level current transformer structure that is standard;
2, the described net side three-level current transformer three-level current transformer structure that is standard;
3, volage current transformer comprises three groups of brachium pontis and three groups of clamping diodes parallel with one another in described three level, and each brachium pontis comprises four switching tubes, and per two switching tubes join end to end, and three groups of clamping diode mid points connect the mid point of DC side filter capacitor;
4, described direct current survey filter capacitor is made up of two same capacitances in series.
For reaching the purpose of the higher power grade of current transformer, the present invention adopts the structure of volage current transformer in three level, promptly by volage current transformer in two identical in structure three level, by the flat-out friendship orthogonal of the big capacity voltage-type two way convertor that dc bus is formed with form back-to-back, realize higher current transformer power grade.
Advantage of the present invention has:
● the generating pusher side is controlled current transformer entirely can be so that wind turbine generator be moved by optimum efficiency in very big wind speed range, even under low wind speed, the control of boosting of controlling current transformer entirely also can the assurance system be satisfied the condition that is incorporated into the power networks;
● the generating pusher side is controlled current transformer entirely and can be controlled the generator output current, obtains maximum electromagnetic torque under the situation of minimum current, and has reduced the copper loss and the iron loss of generator;
● the generating pusher side is controlled current transformer entirely can provide the electric current that is almost sine, has reduced the harmonic wave of generator unit stator side, the torque control of generator inside is improved, thereby has further alleviated drive system stress;
● net side grid-connected converter has realized that the system power factor is adjustable on the basis that has guaranteed the grid-connected current quality.
● adopt the middle volage current transformer structure of three level, make the switching device stress of converter system be reduced to half of former switch stress, be more convenient for the type selecting of switching device.
Feature of the present invention is wind-driven generator, three pole reactor and three phase capacitance, generating pusher side three-level current transformer, DC side filter capacitor, net side three-level current transformer and three-phase grid inductance and three-phase filter capacitor and the step-up transformer that comprises an above power grade of MW class.The feature of generating pusher side three-level current transformer and net side three-level current transformer is by volage current transformer in two identical in structure three level, the flat-out friendship orthogonal of the big capacity voltage-type two way convertor of forming with form back-to-back by dc bus.
The basic topological structure of the main circuit of three-level current transformer as shown in Figure 5.As can be seen, each brachium pontis has four switching tubes, and two switching tubes wherein directly linking on the positive and negative dc bus are referred to as main switch, and two middle switching tubes are referred to as auxiliary switch.Survey at direct current, dc capacitor is made up of two the same capacitances in series, a neutral point (Neutral Point) so just can be provided, be connected to two diodes on the neutral point, be referred to as clamping diode (Clamping Diodes), it can current transformer voltage clamp to the neutral point current potential, so this current transformer be also referred to as the neutral-point-clamped current transformer (NeutralPoint Clamped, NPC).
In each moment, current transformer all must have two switching tube conductings.With a is example mutually, and possible switching tube combination is respectively S
A11And S
A21, S
A21And S
A31, S
A31And S
A41, all the other any combinations all are unallowed.The voltage of these three kinds of situation correspondences is respectively+V
d/ 2,0 and-V
d/ 2.Wherein, work as S
A21Perhaps S
A31During conducting, it is 0 that the brachium pontis mid-point voltage is forced to clamp.These three kinds of states use P (Positive), N (Negtive), O to represent respectively, are unallowed by P to N directly in commutation process, because this needs four switching tubes to move simultaneously.In addition, four top switching tubes also have a kind of interlocked relationship in logic, that is: S
A11And S
A31Trigger impulse opposite, S
A21And S
A41Trigger impulse also opposite, so as long as control system can be exported S
A11And S
A21Triggering signal,
During work, wind energy conversion system drive wind-driven generator sends the three-phase frequency and amplitude all changes alternating current, through entering the flat ripple inductance of generator side after the filtering of generating pusher side filter capacitor.Flat ripple inductance both can play the effect of flat ripple to three-phase electricity, can control current transformer entirely with the generating pusher side again and constitute booster converter, so just can be so that wind turbine generator is pressed the optimum efficiency operation in very big wind speed range, even under low wind speed, the control of boosting of full control current transformer also can guarantee the stable of DC bus-bar voltage, and the collateral security system satisfies the condition that is incorporated into the power networks.After the filtering of the alternating current that comes by the output of flat ripple inductance through the rectification of generating pusher side three-level current transformer and DC side filter capacitor, as the dc bus direct feed of net side three-level current transformer to net side three-level current transformer.Export the three-phase alternating current of the permanent width of cloth of constant frequency through the net side three-level current transformer of PWM control, via the flat ripple of three-phase grid inductance again by after the filtering of three-phase grid filter capacitor, can obtain the three-phase quasi sine alternating current of the permanent width of cloth of constant frequency and electrical network homophase, satisfy the condition that is incorporated into the power networks, be connected to the grid after boosting through step-up transformer.Wherein the three-phase grid inductance is regulated the effect of the phase place of grid-connected current in addition except having flat ripple effect, enables to satisfy the alternating current condition that is incorporated into the power networks.Parasitic fly-wheel diode among the switching device IGBT in addition, it is except having the afterflow effect, or the passage of reactive power, also is known as feedback diode.
Megawatt level wind power generation of the present invention is not only applicable to the permanent magnet direct-drive wind-force generating system with volage current transformer main circuit structure in three level, but also presses double-fed type wind generator system in being applicable to.
(5) description of drawings:
Fig. 1 is a double feedback electric engine converter structure schematic diagram;
Fig. 2 is the permanent magnet direct-drive converter structure schematic diagram that adopts uncontrollable rectification;
Fig. 3 is a formula permanent magnet direct-drive converter structure schematic diagram back-to-back;
Fig. 4 is the current source type converter structural representation;
Fig. 5 is a grid-connected converter main circuit structure schematic diagram of the present invention.
(6) embodiment
For a more detailed description below in conjunction with the drawings and specific embodiments to the present invention:
In conjunction with Fig. 5, the present embodiment megawatt level wind power generation mainly comprises with volage current transformer in three level: wind-driven generator Gen, generating pusher side three phase capacitance C
1f, three pole reactor L
1n, generating pusher side three-level current transformer (S
A11～S
A41, S
B11～S
B41, S
C11～S
C41) contain fly-wheel diode and clamping diode (D
A11, D
A21, D
B11, D
B21, D
C11, D
C21), DC side filter capacitor C
1And C
2, net side three-level current transformer (S
A12～S
A42, S
B12～S
B42, S
C12～S
C42) contain fly-wheel diode and clamping diode (D
A12, D
A22, D
B12, D
B22, D
C12, D
C22), the three-phase grid inductance L
2n, three-phase filter capacitor C
2fWith the 690VAC step-up transformer.
Wind-driven generator Gen is connected to three filter capacitor C that connect according to star-like mode
1fAfter be parallel to three equal ripple inductance L
1nAn end, then with flat ripple inductance L
1nThe other end be connected to the V of generating pusher side three-level current transformer
11～V
13The place.The concrete implementation of generating pusher side three-level current transformer is with 12 switching device S
A11～S
A41, S
B11～S
B41, S
C11～S
C41(contain fly-wheel diode, the present invention adopts IGBT but is not limited to IGBT) and clamping diode (D
A11, D
A21, D
B11, D
B21, D
C11, D
C21) tetrad, be respectively S
A11～S
A41, S
B11～S
B41, S
C11～S
C41, per two devices in every group join end to end and form one group of brachium pontis then.Sa
21And S
A31, S
B21And S
B31, S
C21And S
C31Tie point be respectively V
11, V
12, V
13The connected mode of clamping diode (is example mutually with a): D
A11, D
A21Join end to end, be connected to S then
A11And S
A21, S
A31And S
A41The intersection point place.The connected mode of b, c two-phase is mutually identical with a.Like this three groups of clamping diode arms are connected good after, receive DC side filter capacitor C after its mid point separately is connected to each other
1And C
2Mid point.Then with three groups of brachium pontis three-phase tri-level current transformer main circuits that promptly form parallel with one another.The dc output end of generating pusher side three-level current transformer is at filter capacitor C in parallel
1And C
2After, directly feeder line is to the dc bus side of net side three-level current transformer, the DC power supply that provides inversion to use for net side three-level current transformer.For filter effect and the useful life that strengthens filter capacitor, filter capacitor can adopt single electric capacity three strings two filter capacitor group structure also.The embodiment that net side three-level current transformer constitutes is identical with the execution mode that the generating pusher side is controlled current transformer entirely, repeats no more.The three-phase alternating current output of net side three-level current transformer is directly connected to the three-phase grid inductance L
2n, pass through then and three-phase filter capacitor C
2fBe connected to the grid after linking step-up transformer after the parallel connection.
Claims (5)
1, a kind of megawatt level wind power generation is with volage current transformer in three level, it is characterized in that it is to be connected to form with form back-to-back by dc bus by volage current transformer in two identical in structure three level, volage current transformer comprises three pole reactor, three phase capacitance, generating pusher side three-level current transformer, DC side filter capacitor, net side three-level current transformer and three-phase grid inductance and three-phase filter capacitor in three level, and generating pusher side three-level current transformer and net side three-level current transformer are connected with form back-to-back by dc bus; Be parallel to an end of three pole reactor after the wind-driven generator connection three phase capacitance, the other end of three pole reactor connects generating pusher side three-level current transformer, the dc output end of generating pusher side three-level current transformer connects the dc bus side of net side three-level current transformer by the DC side filter capacitor, the three-phase alternating current output of net side three-level current transformer connects the three-phase grid inductance, with link step-up transformer after the three-phase filter capacitor is in parallel, step-up transformer connects electrical network.
2, megawatt level wind power generation according to claim 1 is characterized in that with volage current transformer in three level described generating pusher side three-level current transformer is the three-level current transformer structure of standard.
3, megawatt level wind power generation according to claim 1 is characterized in that with volage current transformer in three level described net side three-level current transformer is the three-level current transformer structure of standard.
4, according to claim 2 or 3 described megawatt level wind power generations with volage current transformer in three level, it is characterized in that volage current transformer comprises three groups of brachium pontis and three groups of clamping diodes parallel with one another in described three level, every group of clamping diode joins end to end, each brachium pontis comprises four switching tubes, per two switching tubes join end to end, and three groups of clamping diode mid points connect the mid point of DC side filter capacitor.
5, megawatt level wind power generation according to claim 1 is with volage current transformer in three level, it is characterized in that described direct current surveys filter capacitor and be made up of two same capacitances in series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100717419A CN100486075C (en) | 2007-02-07 | 2007-02-07 | Three-level medium voltage converter for megawatt wind power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100717419A CN100486075C (en) | 2007-02-07 | 2007-02-07 | Three-level medium voltage converter for megawatt wind power generation |
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| Publication Number | Publication Date |
|---|---|
| CN101013818A CN101013818A (en) | 2007-08-08 |
| CN100486075C true CN100486075C (en) | 2009-05-06 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101316074B (en) * | 2008-03-26 | 2011-08-10 | 中国科学院电工研究所 | Back-to-back three-power level midpoint clamping current transformer of wind power generation system |
| CN101345423B (en) * | 2008-05-07 | 2011-11-16 | 中国科学院电工研究所 | 5-power level H-bridge cascade connection back-to-back current transformer used for wind power generation system |
| CN103503268B (en) * | 2011-06-24 | 2016-01-20 | Abb技术有限公司 | Wind energy converter |
| CN103001573B (en) | 2011-09-13 | 2016-03-23 | 台达电子企业管理（上海）有限公司 | Medium voltage converter drive system |
| CN103036461B (en) * | 2011-09-29 | 2016-03-30 | 台达电子企业管理（上海）有限公司 | Three phase rectifier module, its system be suitable for and harmonic suppressing method |
| CN103986340B (en) * | 2014-05-23 | 2017-10-10 | 台达电子企业管理（上海）有限公司 | Supply convertor |
| CN104052060B (en) * | 2014-07-04 | 2016-08-17 | 国家电网公司 | A kind of grid-connected wind engine unit suppression resonance method |
| CN104660081B (en) * | 2015-01-26 | 2017-09-26 | 中国矿业大学 | A kind of active clamp dual three-level frequency converter and its loss balancing modulation algorithm |
| CN107689735B (en) * | 2016-08-05 | 2020-01-31 | 台达电子企业管理（上海）有限公司 | Power conversion system and common-mode voltage suppression method thereof |
| CN107884634B (en) * | 2017-09-21 | 2020-01-24 | 北京机械设备研究所 | Self-circulation test method of back-to-back converter |
| CN109372698A (en) * | 2018-10-18 | 2019-02-22 | 明阳智慧能源集团股份公司 | A kind of wind generator system |
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Effective date of registration: 20120808 Address after: 150028, No. 1, unit D43, building -29, phase three, Shimao new town, Songbei, Harbin, Heilongjiang, Binjiang Patentee after: Harbin Jiuzhou Electrical Technology Co.,Ltd. Address before: 150081 Heilongjiang Province, Harbin city Nangang District haping Road No. 162 Patentee before: Jiuzhou Electric Co., Ltd., Harbin |
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