CN101051793A - Megawatt direct driving type wind and electric joint-net current transformer - Google Patents
Megawatt direct driving type wind and electric joint-net current transformer Download PDFInfo
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- CN101051793A CN101051793A CNA2007100722328A CN200710072232A CN101051793A CN 101051793 A CN101051793 A CN 101051793A CN A2007100722328 A CNA2007100722328 A CN A2007100722328A CN 200710072232 A CN200710072232 A CN 200710072232A CN 101051793 A CN101051793 A CN 101051793A
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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 convertor includes three-phase filter capacitor (TFC), rectifier unit, and step up chopper unit, inverter unit at generator side as well as TFC and transformer at network side. Wind driven generator is connected to TFC, and TFC is connected to the rectifier unit. The rectifier unit is connected to the step up chopper unit, and the step up chopper unit is connected to the inverter unit. The inverter unit is connected to TFC, and the TFC is connected to transformer. The transformer is connected to power grid in power frequency. The invention reduces cost of Wind driven generation equipment greatly, and raises competitive power.
Description
(1) technical field
The invention belongs to energy technology field, be specifically related to a kind of used for wind power generation total power grid-connected converter of MW class power grade.
(2) background technology
Wind power generation presents powerful growth momentum on the All Around The World electricity market, in order to promote the development of grid type wind power generation, explicitly call in " the medium-term and long-term development plan of regenerative resource " that National Development and Reform Committee organizes to set up, national wind-powered electricity generation installed capacity in 2010 reaches 5,000,000 kilowatts, and the wind-powered electricity generation installed capacity of the year two thousand twenty whole nation reaches 3,000 ten thousand kilowatts.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.The AC excitation double-fed motor of variable speed constant frequency and directly drive multipole magneto and be acknowledged as the most promising wind power generation scheme becomes the preferred option of megawatt-level wind unit, also is the main direction that China marches megawatt-level wind market.
Gear box is to transship and the higher parts of premature damage rate in the AC excitation double-fed wind turbine generator of MW level at present, since last century Mo, 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 is transformed to the alternating current feed-in electrical network of frequency, voltage constant by current transformer, 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.American-European countries maintains the leading position on wind power technology, much enters the company in blower fan market, has all released the Related product of 2MW-5MW such as Enercon, ABB etc.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.The blower fan giant Enercon company of Germany adopts main circuit topological structure as shown in Figure 1.This is that a kind of technology is the most ripe, move the most reliably, and accommodation is technical scheme the most widely, and can four quadrant running, has therefore obtained application widely in practice.But the control system of sort circuit is comparatively complicated, and cost is also higher relatively, therefore also is subjected to certain restriction in popularization.ABB AB of Switzerland adopts the main circuit structure of three level to solve the above wind power system (as shown in Figure 2) of high-power especially MW class.Owing to adopted Hair Fixer motor in the permanent magnetism, the voltage of its generation is the 4KV grade, is optimal selection so adopt the scheme of formula back-to-back of three level.Though three-level current transformer can produce very low current/voltage percent harmonic distortion, and need very little filter, the increase of the IGCT switching device that adopts and the drift of the neutral point voltage between discrete capacitor have limited the application of this main circuit structure.There is the bibliographical information neutral point drifting can adopt the mode of control to be resolved in addition recently, but because the technical parameter of the blower fan manufacturer of China is that 690VAC is (by 2006 ends mostly, the wind-driven generator unit of all installations of China all is the low pressure unit of 690VAC), this limits the application of many level structure in China more.Traditional current mode AC-DC-AC converter adopts the nature commutated thyristor as switching device, and its DC side inductance is relatively more expensive, because its low frequency performance is poor, thereby seldom uses in the wind power generation.The PowerFlex7000 of Rockwell company is the current source converter (as shown in Figure 3) that adopts SGCT, be applicable to Middle pressure draught fan, and wind-driven generator is 690VAC, so electric pressure is inapplicable, and near the performance need of PowerFlex7000 low speed and zero-speed improves in addition.
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.
(3) summary of the invention
The power converter that the purpose of this invention is to provide a kind of novel used for wind power generation that is used for direct-drive type MW class power grade.
The object of the present invention is achieved like this: it comprises generating pusher side three-phase filtering capacitor, rectifier unit, boost chopper unit, inverter unit, net side three-phase filtering capacitor and transformer, wind-driven generator connects the three-phase filtering capacitor, the three-phase filtering capacitor connects rectifier unit, rectifier unit connects the boost chopper unit, the boost chopper unit connects inverter unit, inverter unit connects the three-phase filtering capacitor, the three-phase filtering capacitor connects transformer, and transformer connects common frequency power network.
The present invention also has some architectural features like this:
1, described rectifier unit is made of at least one uncontrollable three-phase diode rectifier, and a plurality of uncontrollable three-phase diode rectifiers are connected in parallel;
2, described boost chopper unit is made of at least one boost chopper, a plurality of boost choppers are connected in parallel, but each boost chopper comprises front end voltage regulation capacitor, copped wave inductance stopcock device, diode and output bus capacitor, voltage regulation capacitor, copped wave inductance and diode are connected in series, but copped wave inductance and diode series connection node place's parallel connection stopcock device, each capacitor in parallel of the head and the tail two ends of copped wave inductance and diode branch, the neutral earthing of output bus;
3, described inverter unit is made of at least one three-phase fully-controlled inverter, a plurality of three-phase fully-controlled inverters are connected in parallel, each three-phase fully-controlled inverter comprises the inverter of being made up of the three-phase brachium pontis and the inductance that is incorporated into the power networks, and the tie point of every group of brachium pontis of inverter connects the inductance that is incorporated into the power networks respectively;
4, described generating pusher side three-phase filtering capacitor is that electric capacity by star-like connection constitutes; Described net side three-phase filtering capacitor is that the electric capacity by star-like connection constitutes, and neutral earthing.
According to the power grade of wind-driven generator and the coupling of the coiling number of phases, rectifier unit can be formed in parallel by one or more uncontrollable three-phase diode rectifiers, the boost chopper parallel connection of different numbers can be selected in the boost chopper unit, and same inverter unit can select two or more three-phase fully-controlled inverter to compose in parallel.Device for power switching all adopts in the main circuit of the present invention is IGBT but is not limited to IGBT.
During work, because change of wind velocity, wind energy conversion system drive wind-driven generator sends the three-phase frequency and amplitude all changes alternating current, through entering rectifier unit after the filtering of generating pusher side three-phase filtering capacitor.The direct current that the AC rectification that rectifier unit all changes the three-phase amplitude-frequency becomes the amplitude of many pulse waves to change.Direct current is through behind the boost chopper unit, and the direct current of the variation of low amplitude value is boosted is the DC bus-bar voltage of amplitude stability, and direct feed is to inverter unit then.Even therefore under low wind speed, the boost chopper unit also can guarantee the stable of DC bus-bar voltage, the collateral security system satisfies the condition that is incorporated into the power networks.The capacitor at boost chopper head and the tail two ends is filtering capacitor, the high order harmonic component in can the filtering direct current.The three-phase alternating current of the permanent width of cloth of output constant frequency behind the inverter unit of DC bus-bar voltage process PWM control.Three-phase alternating current via the flat ripple of three-phase grid inductance in the inverter unit again by after the filtering of net side three-phase filtering 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 transformer then.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, except having the afterflow effect, the still passage of reactive power, so also be known as feedback diode.
Beneficial effect of the present invention has:
1. simple circuit configuration makes that the cost of current transformer is effectively reduced.
2. combining inverter has realized that the system power factor is adjustable on the basis that has guaranteed the grid-connected current quality.
3. modular unit parallel-connection structure can be realized the power grade of higher used for wind power generation current transformer on the basis of the switching device of equal switching voltage current stress, and the seriation of realization product that can be more convenient.
Product of the present invention not only reduces the cost of wind power equipment greatly, and can improve the competitiveness of China in world's wind-powered electricity generation industry, is China's wind power technology outlet, and the status that is lifted on world's wind-power market lays the foundation.
(4) description of drawings
Fig. 1 is a formula permanent magnet direct-drive current transformer back-to-back;
Fig. 2 is three level formula permanent magnet direct-drive current transformers back-to-back;
Fig. 3 is a current source type converter;
Fig. 4 is a grid-connected converter main circuit structure of the present invention.
(5) embodiment
For a more detailed description below in conjunction with the drawings and specific embodiments to the present invention:
In conjunction with Fig. 4, present embodiment comprises: the wind-driven generator of a MW class power grade, generating pusher side three-phase filtering capacitor C
F1, rectifier unit, boost chopper unit, inverter unit, net side three-phase filtering capacitor C
F2, C
F3, transformer and common frequency power network.Rectifier unit is to be made of the uncontrollable diode rectifier of three-phase, and it comprises six diode (D
1～D
6).The boost chopper unit is to be formed by a plurality of boost choppers, and each boost chopper all is by DC side filter capacitor C
1, inductance L
1, switch transistor T
1, diode D
7Support capacitor C with DC side
2And C
3Constitute.Inverter unit is to be combined by the parallel connection of two or more three-phase fully-controlled inverter, and each inverter is again by six switching tube (T
11～T
16, T
21～T
26) contain fly-wheel diode (D
11～D
16, D
21～D
26) and the inductance (L that is incorporated into the power networks
31, L
32) constitute.
1. make up each unit link, comprise rectifier unit, boost chopper unit and inverter unit.
At first make up rectifier unit.With six diode (D
1～D
6) one group in twos, be respectively D
1And D
4, D
3And D
6, D
5And D
2, two devices in every group join end to end and form one group of brachium pontis then, then with three groups of brachium pontis parallel connections.If a plurality of rectifiers are arranged, the parallel connection of the two ends of a plurality of brachium pontis is got final product.
Next makes up the boost chopper unit.With inductance L
1With diode D
7Series connection, a switch transistor T in parallel then at its node place
1, at last at L
1-D
7Each capacitor in parallel of the head and the tail two ends of branch road, wherein the capacitor of inductance front end is C
1, diode D
7The capacitor of back is by C
2And C
3Be in series, to form dc bus.Two capacitor C
2And C
3Neutral earthing.If the boost chopper unit is to be made of a plurality of boost choppers, only need single boost chopper parallel connection is got final product.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.
Make up inverter unit at last.The embodiment of inverter unit is at first to constitute single inverter, then single inverter parallel connection is got final product.With six switching device (T
11～T
16) contain fly-wheel diode (D
11～D
16) (the present invention adopts IGBT but is not limited to IGBT) a group in twos, be respectively T
11And T
14, T
13And T
16, T
15And T
12, secondly two devices in every group being joined end to end and form three groups of brachium pontis, the tie point of every group of brachium pontis is connected respectively to the three-phase grid inductance L
31, then with three groups of brachium pontis three-phase fully-controlled converter main circuits that promptly form parallel with one another.Also can be according to same execution mode with switching device (T
21～T
26) contain fly-wheel diode (D
21～D
26) and the three-phase grid inductance L
32Form another inverter, formation inverter unit at last is together in parallel two inverters.In order to mate the more requirement of high power level, only need a plurality of single inverters parallel connections are got final product.
2. then with wind-driven generator process generating pusher side three-phase filtering capacitor C
F1Be sequentially connected to rectifier unit, boost chopper unit, inverter unit, then via net side three-phase filtering capacitor C
F2, C
F3After the filtering, be connected to and be connected to the grid after transformer boosts.
Claims (5)
1, a kind of megawatt direct driving type wind and electric joint-net current transformer, it comprises transformer, it is characterized in that it also comprises generating pusher side three-phase filtering capacitor, rectifier unit, boost chopper unit, inverter unit and net side three-phase filtering capacitor, wind-driven generator connects the three-phase filtering capacitor, the three-phase filtering capacitor connects rectifier unit, rectifier unit connects the boost chopper unit, the boost chopper unit connects inverter unit, inverter unit connects the three-phase filtering capacitor, the three-phase filtering capacitor connects transformer, and transformer connects common frequency power network.
2, megawatt direct driving type wind and electric joint-net current transformer according to claim 1 is characterized in that described rectifier unit is made of at least one uncontrollable three-phase diode rectifier, and a plurality of uncontrollable three-phase diode rectifiers are connected in parallel.
3, megawatt direct driving type wind and electric joint-net current transformer according to claim 1, it is characterized in that described boost chopper unit is made of at least one boost chopper, a plurality of boost choppers are connected in parallel, each boost chopper comprises the front end voltage regulation capacitor, the copped wave inductance, but stopcock device, diode and output bus capacitor, voltage regulation capacitor, copped wave inductance and diode are connected in series, but copped wave inductance and diode series connection node place's parallel connection stopcock device, each capacitor in parallel of the head and the tail two ends of copped wave inductance and diode branch, the neutral earthing of output bus.
4, megawatt direct driving type wind and electric joint-net current transformer according to claim 1, it is characterized in that described inverter unit is made of at least one three-phase fully-controlled inverter, a plurality of three-phase fully-controlled inverters are connected in parallel, each three-phase fully-controlled inverter comprises the inverter of being made up of the three-phase brachium pontis and the inductance that is incorporated into the power networks, and the tie point of every group of brachium pontis of inverter connects the inductance that is incorporated into the power networks respectively.
5, megawatt direct driving type wind and electric joint-net current transformer according to claim 1 is characterized in that described generating pusher side three-phase filtering capacitor is that electric capacity by star-like connection constitutes; Described net side three-phase filtering capacitor is that the electric capacity by star-like connection constitutes, and neutral earthing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100722328A CN101051793A (en) | 2007-05-21 | 2007-05-21 | Megawatt direct driving type wind and electric joint-net current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100722328A CN101051793A (en) | 2007-05-21 | 2007-05-21 | Megawatt direct driving type wind and electric joint-net current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN101051793A true CN101051793A (en) | 2007-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100722328A Pending CN101051793A (en) | 2007-05-21 | 2007-05-21 | Megawatt direct driving type wind and electric joint-net current transformer |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009137969A1 (en) * | 2008-05-15 | 2009-11-19 | Xuan Kun | A photovoltaic grid-connected inverter device without a transformer and its control method |
| CN101860041A (en) * | 2010-05-04 | 2010-10-13 | 合肥阳光电源有限公司 | Method for dynamically adjusting busbar voltage to improve grid connection efficiency |
| CN101889211A (en) * | 2007-12-08 | 2010-11-17 | 赖茵豪森机械制造公司 | Device for testing transformers |
| CN101895129A (en) * | 2010-08-05 | 2010-11-24 | 上海交通大学 | AC-DC-AC wind power generation cut-in control system |
| US7894211B2 (en) * | 2008-01-24 | 2011-02-22 | Honeywell International Inc. | Micro wind turbine topology for small scale power generation |
| CN102082525A (en) * | 2010-03-22 | 2011-06-01 | 上海海事大学 | Quasi-resonant converter capable of limiting reverse recovery current |
| CN101599649B (en) * | 2009-04-21 | 2012-05-09 | 合肥工业大学 | Directly-driven wind power generation system and mode for modulating SPWM inversion control signal in system |
| CN102832635A (en) * | 2011-12-01 | 2012-12-19 | 上海交通大学 | Wind power generation networking control system based on direct driving modulation multi-level converter |
| CN102931685A (en) * | 2012-11-19 | 2013-02-13 | 新疆金风科技股份有限公司 | Converter device used for wind generator system |
| CN103248070A (en) * | 2013-05-10 | 2013-08-14 | 广东明阳风电产业集团有限公司 | Energy transmission system of wind turbine generator system |
| CN103532348A (en) * | 2013-10-22 | 2014-01-22 | 南车株洲电力机车研究所有限公司 | Functional unit cabinet of high-power semiconductor convertor |
| CN103580064A (en) * | 2013-11-20 | 2014-02-12 | 上海电机学院 | Wind generating set network access method and system |
| CN103580472A (en) * | 2012-08-02 | 2014-02-12 | 成都联腾动力控制技术有限公司 | Rectification system circuit for drive circuit of power device of electric controller |
| CN104201717A (en) * | 2014-09-01 | 2014-12-10 | 黄守道 | Permanent magnet direct-driven wind power system |
| CN106481527A (en) * | 2016-12-12 | 2017-03-08 | 合肥源擎电气科技有限公司 | A kind of independently-powered water pump water management system of wind energy |
| RU2742889C1 (en) * | 2019-12-26 | 2021-02-11 | Юлий Борисович Соколовский | Method of electric power supply for autonomous consumers by wind power devices |
| CN112512858A (en) * | 2018-07-31 | 2021-03-16 | 西门子股份公司 | Modular converter |
-
2007
- 2007-05-21 CN CNA2007100722328A patent/CN101051793A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889211A (en) * | 2007-12-08 | 2010-11-17 | 赖茵豪森机械制造公司 | Device for testing transformers |
| CN101889211B (en) * | 2007-12-08 | 2013-04-17 | 赖茵豪森机械制造公司 | Device for testing transformers |
| US7894211B2 (en) * | 2008-01-24 | 2011-02-22 | Honeywell International Inc. | Micro wind turbine topology for small scale power generation |
| WO2009137969A1 (en) * | 2008-05-15 | 2009-11-19 | Xuan Kun | A photovoltaic grid-connected inverter device without a transformer and its control method |
| US8125807B2 (en) | 2008-05-15 | 2012-02-28 | Xuan Kun | Transformerless photovoltaic grid-connecting inverting device and control method thereof |
| CN101599649B (en) * | 2009-04-21 | 2012-05-09 | 合肥工业大学 | Directly-driven wind power generation system and mode for modulating SPWM inversion control signal in system |
| CN102082525A (en) * | 2010-03-22 | 2011-06-01 | 上海海事大学 | Quasi-resonant converter capable of limiting reverse recovery current |
| CN101860041A (en) * | 2010-05-04 | 2010-10-13 | 合肥阳光电源有限公司 | Method for dynamically adjusting busbar voltage to improve grid connection efficiency |
| CN101860041B (en) * | 2010-05-04 | 2012-08-29 | 阳光电源股份有限公司 | Method for dynamically adjusting busbar voltage to improve grid connection efficiency |
| CN101895129A (en) * | 2010-08-05 | 2010-11-24 | 上海交通大学 | AC-DC-AC wind power generation cut-in control system |
| CN102832635A (en) * | 2011-12-01 | 2012-12-19 | 上海交通大学 | Wind power generation networking control system based on direct driving modulation multi-level converter |
| CN102832635B (en) * | 2011-12-01 | 2014-10-15 | 上海交通大学 | Wind power generation networking control system based on direct driving modulation multi-level converter |
| CN103580472A (en) * | 2012-08-02 | 2014-02-12 | 成都联腾动力控制技术有限公司 | Rectification system circuit for drive circuit of power device of electric controller |
| CN102931685A (en) * | 2012-11-19 | 2013-02-13 | 新疆金风科技股份有限公司 | Converter device used for wind generator system |
| CN103248070A (en) * | 2013-05-10 | 2013-08-14 | 广东明阳风电产业集团有限公司 | Energy transmission system of wind turbine generator system |
| CN103248070B (en) * | 2013-05-10 | 2015-11-04 | 广东明阳风电产业集团有限公司 | A kind of energy transmission system of wind turbine generator system |
| CN103532348A (en) * | 2013-10-22 | 2014-01-22 | 南车株洲电力机车研究所有限公司 | Functional unit cabinet of high-power semiconductor convertor |
| CN103580064A (en) * | 2013-11-20 | 2014-02-12 | 上海电机学院 | Wind generating set network access method and system |
| CN104201717A (en) * | 2014-09-01 | 2014-12-10 | 黄守道 | Permanent magnet direct-driven wind power system |
| CN106481527A (en) * | 2016-12-12 | 2017-03-08 | 合肥源擎电气科技有限公司 | A kind of independently-powered water pump water management system of wind energy |
| CN112512858A (en) * | 2018-07-31 | 2021-03-16 | 西门子股份公司 | Modular converter |
| RU2742889C1 (en) * | 2019-12-26 | 2021-02-11 | Юлий Борисович Соколовский | Method of electric power supply for autonomous consumers by wind power devices |
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