CN101795082A - Megawatt direct-drive wind power grid-connection soft-switching converter - Google Patents
Megawatt direct-drive wind power grid-connection soft-switching converter Download PDFInfo
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- CN101795082A CN101795082A CN201010301248A CN201010301248A CN101795082A CN 101795082 A CN101795082 A CN 101795082A CN 201010301248 A CN201010301248 A CN 201010301248A CN 201010301248 A CN201010301248 A CN 201010301248A CN 101795082 A CN101795082 A CN 101795082A
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Abstract
The invention relates to a full-power grid-connection converter for megawatt wind power generation, in particular to a megawatt direct-drive wind power grid-connection soft-switching converter, belonging to the technical field of new wind power energy. The technical scheme is that the converter comprises a motor-side three-phase filter capacitor unit, a rectifier unit, a boost chopper unit, a soft switching unit, an inverter unit and a grid-side three-phase filter capacitor unit, the units are connected with each other in a matching way. The invention is characterized in that the rectifier unit is formed by at least one three-phase uncontrolled diode rectifier unit or a plurality of three-phase uncontrolled diode rectifier units connected in parallel; the boost chopper unit is formed by at least one booster chopper unit or a plurality of boost chopper units connected in parallel; and the inverter unit is formed by at least one inverter unit or a plurality of inverter units connected in parallel. The invention has the advantages that the circuit structure is simple and the cost of the converter is greatly reduced; since the soft-switching technology is introduced, the switching loss of the power devices is greatly reduced; and since the rectifier unit, the boost chopper unit and the inverter unit in the circuit adopt modularized circuits, on the basis of switching devices with equivalent switching voltage and current stress, the higher power level can be realized and the serialization of the product can be realized more conveniently.
Description
Affiliated technical field:
The present invention relates to a kind of used for wind power generation total power grid-connected converter, particularly megawatt direct-drive wind power grid-connection soft switching converter of MW class power grade, belong to the wind-powered electricity generation technical field of new energies.
Background technology:
Along with being on the rise of energy problem, the subject matter that the energy and environmental problem have become global sustainable development and faced causes the extensive concern of international community day by day.Greatly develop new forms of energy and become the fundamental way that addresses the above problem.Wherein, wind power generation is the generation mode of technology comparative maturity in the present new forms of energy, exploitation condition on the largest scale and commercialized development prospect, have occupation of land less, advantage such as pollution-free, construction period is short, the installation scale is flexible, be subjected to the extensive concern of countries in the world, on the All Around The World electricity market, present powerful growth momentum.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, the wind-powered electricity generation installed capacity of the year two thousand twenty whole nation reaches 3,000 ten thousand kilowatts.As everyone knows, the grid type wind generator system mainly comprises direct-drive wind power system and two kinds of forms of non-direct drive formula wind generator system.Wherein, the AC excitation double-fed motor wind generator system of variable speed constant frequency and typical case's representative that directly to drive multipole magneto wind generator system be these two kinds of wind generator systems, it also is the most promising wind power generation scheme, having become at present the preferred option of megawatt-level wind unit, also is the main direction that China's wind power equipment manufacturing industry marches megawatt-level wind market simultaneously.
The wind wheel of non-direct drive formula wind generator system is connected to the grid by transformer then by step-up gear sending and receiving motor.And the direct sending and receiving motor of wind wheel in the direct-drive wind power system is connected to the grid by current transformer then.Obviously, direct-drive wind power system is compared with non-direct drive formula wind generator system, saved step-up gear, so not only reduced the volume and weight of wind-driven generator, and reduced line service to gear box, reduced the noise of wind power system, multiple advantage such as high efficiency when having improved unit durability and low wind speed, so direct-drive wind power system has become the development trend of modern wind electricity generation system, and as the quality of the grid-connected converter performance of its core component that is incorporated into the power networks the normal operation of whole system is played crucial effects, so the research of direct-drive type grid-connected converter becomes the research focus of wind-powered electricity generation sciemtifec and technical sphere.
The power grade and the generating set of the grid-connected converter of direct-drive aerogenerator group are suitable, the electric energy that generator sends all is converted 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 non-direct drive formula wind generator system, current transformer uses between generating set and electrical network, realized the isolation of generating set and electrical network, coupled problem between rotating speed and the mains frequency has obtained good solution, 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 for a long time, and a lot of wind power equipment manufacturers have all released the Related product of 2MW～5MW as Enercon, ABB, Siemens etc.Wherein German wind power equipment giant Enercon company's employing main circuit topological structure as shown in Figure 1.This is that a kind of technology is the most ripe, operation is the most reliable, the technical scheme that accommodation is extensive.But its control system is comparatively complicated, do not consider the switching loss problem of device for power switching, and in MW level field, the switching loss problem of device for power switching is a problem that can not be ignored, increasing along with power grade, its harm is more and more serious even can cause burning of device.In order to reduce the switching loss of power device, ABB AB adopts the main circuit structure of three level to be applied in the above wind power system of MW class, this system can reduce the switching loss of each switching device greatly, produces very low current/voltage percent harmonic distortion, and the filter capacity that needs is little.But the consumption of comparing device for power switching with the main circuit structure of two level has increased by one times, has increased cost greatly.
At present, domesticly be in the starting stage generally with the research and the manufacture view of power converter at million grade wind driven generators, particularly also be in the blank stage aspect 2MW and the above power grade current transformer fully, seriously restricting carrying out smoothly of China's wind power equipment manufacturing industry production domesticization.
Summary of the invention:
The object of the invention provides a kind of megawatt direct-drive wind power grid-connection soft switching converter, and circuit structure is simple, reduces the cost of wind power equipment, solves the problems referred to above that exist in the background technology.
Technical scheme of the present invention is:
The megawatt direct-drive wind power grid-connection soft switching converter, it comprises motor side three-phase filter capacitor unit, rectification unit, boost chopper unit, soft switching cell, inversion unit, net side three-phase filter capacitor unit, between each unit successively coupling connect, its special feature is: described rectification unit does not control by at least one three-phase that the diode rectification unit constitutes or a plurality of three-phase is not controlled the diode rectification unit and is connected in parallel and constitutes; Described boost chopper unit is made of at least one boost chopper unit or a plurality of boost chopper unit is connected in parallel constitutes; Described inversion unit is made of at least one inversion unit or a plurality of inversion unit is connected in parallel constitutes.
The present invention adopts soft switch technique to control and solves the big problem of power switch losses.
The device for power switching that main circuit adopts among the present invention can be IGCT, but is not limited to IGCT.
When the present invention worked, because the wind speed place is in constantly changing, wind energy conversion system drove the alternating current that wind-driven generator output three-phase frequency and amplitude all change, and enters rectification unit behind the three-phase filter capacitor unit through the generating pusher side.Rectification unit with three-phase amplitude frequency all change the AC rectification direct current that becomes the amplitude of many pulse waves to change.Direct current becomes the DC bus-bar voltage of amplitude stability after boost chopper unit, and then feed-in inversion unit under the conditioning of resonant element.Inversion unit changes direct current and line voltage frequency homophase alternating current together under the control of control system, and transformer is connected to the grid through being incorporated into the power networks.Because the existence of boost chopper unit even under lower wind speed, also can guarantee the stable of DC bus-bar voltage.
Beneficial effect of the present invention: circuit structure is simple, greatly reduces the cost of current transformer; Introduce soft switch technique, greatly reduced the switching loss of power device; The modularized circuit that rectification unit in the circuit, boost chopper unit, inversion unit all adopt, this structure is on the basis of the switching device of equal switching voltage current stress, higher power grade can be realized, and the seriation of product can be realized more easily.
Product circuit of the present invention is simple in structure, not only greatly reduce the cost of wind power equipment, and can improve China and make the status and the influence power in field at world's wind power equipment, being the outlet of China's wind power equipment, solid foundation has been established in the status that is lifted on world's wind-power market.
Description of drawings:
Fig. 1 is a formula permanent magnet direct-drive formula current transformer schematic diagram back-to-back in the background technology.
Fig. 2 is a schematic diagram of the present invention.
Among the figure: wind energy conversion system 1, generator 2, the transformer 3 that is incorporated into the power networks, electrical network 4.
Embodiment:
Below in conjunction with accompanying drawing, the invention will be further described by embodiment.
With reference to accompanying drawing 2, in an embodiment, the present invention the wind energy conversion system 1 of MW class, generator 2, and the transformer 3 that is incorporated into the power networks, electrical network 4 between, the megawatt direct-drive wind power grid-connection soft switching converter comprises: generating pusher side three-phase filtering capacitor C
F1, rectifier unit, boost chopper unit, soft switching cell, inversion unit, net side three phase capacitance filter C
F2Wind energy conversion system 1, generator 2 connect the three-phase filtering capacitor, the three-phase filtering capacitor connects rectifier unit, rectifier unit connects boost chopper unit, boost chopper unit connects soft switching cell, soft switching cell connects inverter unit, inverter unit connects the three-phase filtering capacitor, and the three-phase filtering capacitor connects the transformer 3 that is incorporated into the power networks, and the transformer that is incorporated into the power networks connects common frequency power network 4.
Rectification unit is to be made of the uncontrollable diode rectifier of three-phase, and it comprises six diode (D
1～D
6).Boost chopper unit is made up of filter inductance L, device for power switching V, diode D, capacitor C.Soft switching cell is by power switch pipe (V
a, V
b), dividing potential drop electric capacity (C
a, C
b), fly-wheel diode (D
a, D
b), inductance L
rForm.Inversion unit is by device for power switching (V
1～V
6), fly-wheel diode (D
31～D
36), filter capacitor (C
31～C
36) constitute.Embodiment mainly was divided into for two steps:
1. make up each unit link, comprise rectification unit, boost chopper unit, soft-switch PWM unit and inversion unit.
At first make up rectification unit; Earlier with six diode ((D
1～D
6) one group in twos, be respectively D
1And D
2, D
3And D
4, D
5And D
6, two devices in every group are joined end to end form a phase brachium pontis then, at last the three-phase brachium pontis is composed in parallel the three phase rectifier unit.If a plurality of rectification units are arranged, the parallel connection of the two ends of a plurality of brachium pontis is got final product.
Next makes up boost chopper unit; With inductance L and diode D series connection, then at its node place parallel connection one device for power switching V, a last capacitor terminal in parallel at the L-D branch road.If boost chopper unit is to be made of a plurality of boost choppers, only need each boost chopper parallel connection is got final product.
And then make up soft switching cell; With device for power switching V
aWith the dividing potential drop capacitor C
a, C
bSeries connection is then with device for power switching V
bAnd inductance L
rAfter the series connection, be connected in parallel on device for power switching V
aWith the dividing potential drop capacitor C
a, C
bThe tie point place, last sustained diode
a, D
bRespectively and at device for power switching V
a, V
bTwo ends.
Make up inversion unit at last; With six device for power switching (V
1～V
6) one group in twos, be respectively V
1And V
2, V
3And V
4, V
5And V
6, two devices in every group are joined end to end form a phase brachium pontis then, and then the three-phase brachium pontis is composed in parallel the three-phase inversion unit, last diode (D
31～D
36) and filter capacitor (C
31～C
36) be connected in parallel on each device for power switching.
2. with wind-driven generator process generating pusher side three-phase filtering capacitor C
F1Be connected to rectifier unit, then rectification unit, boost chopper unit, soft switch resonant element and inversion unit be linked in sequence, at last inversion unit is passed through net side three-phase filtering capacitor C
F2, be connected to the grid after being connected to the transformer that is incorporated into the power networks.
Claims (7)
1. megawatt direct-drive wind power grid-connection soft switching converter, it comprises motor side three-phase filter capacitor unit, rectification unit, boost chopper unit, soft switching cell, inversion unit, net side three-phase filter capacitor unit, between each unit successively coupling connect, it is characterized in that described rectification unit does not control by at least one three-phase that the diode rectification unit constitutes or a plurality of three-phase is not controlled the diode rectification unit and is connected in parallel and constitutes; Described boost chopper unit is made of at least one boost chopper unit or a plurality of boost chopper unit is connected in parallel constitutes; Described inversion unit is made of at least one inversion unit or a plurality of inversion unit is connected in parallel constitutes.
2. the megawatt direct-drive wind power grid-connection soft switching converter according to claim 1, it is characterized in that rectification unit is: earlier with six diodes ((one group in twos of D1～D6), then two devices in every group are joined end to end and form a phase brachium pontis, at last the three-phase brachium pontis is composed in parallel the three phase rectifier unit.
3. the megawatt direct-drive wind power grid-connection soft switching converter according to claim 2 has a plurality of rectification units in it is characterized in that forming, the two ends parallel connection of a plurality of brachium pontis.
4. the megawatt direct-drive wind power grid-connection soft switching converter according to claim 1, it is characterized in that boost chopper unit is: with inductance (L) and diode (D) series connection, then at its node place parallel connection one device for power switching (V), a last capacitor terminal in parallel at branch road.
5. the megawatt direct-drive wind power grid-connection soft switching converter according to claim 4 is characterized in that boost chopper unit is to be made of a plurality of boost choppers, with each boost chopper parallel connection.
6. the megawatt direct-drive wind power grid-connection soft switching converter according to claim 1, it is characterized in that soft switching cell is: with device for power switching (Va) and dividing potential drop electric capacity (Ca, Cb) series connection, then with after device for power switching (Vb) and inductance (Lr) series connection, be connected in parallel on the tie point place of device for power switching (Va) and dividing potential drop electric capacity (Ca, Cb), last fly-wheel diode (Da, Db) is respectively and at device for power switching (Va, Vb) two ends.
7. the megawatt direct-drive wind power grid-connection soft switching converter according to claim 1, it is characterized in that the inversion unit position: with six device for power switching (one group in twos of V1～V6), then two devices in every group are joined end to end and form a phase brachium pontis, and then the three-phase brachium pontis composed in parallel the three-phase inversion unit, last diode (D31～D36) and filter capacitor (C31～C36) be connected in parallel on each device for power switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010103012483A CN101795082B (en) | 2010-02-05 | 2010-02-05 | Megawatt direct-drive wind power grid-connection soft-switching converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010103012483A CN101795082B (en) | 2010-02-05 | 2010-02-05 | Megawatt direct-drive wind power grid-connection soft-switching converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101795082A true CN101795082A (en) | 2010-08-04 |
| CN101795082B CN101795082B (en) | 2012-01-11 |
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|---|---|---|---|
| CN2010103012483A Expired - Fee Related CN101795082B (en) | 2010-02-05 | 2010-02-05 | Megawatt direct-drive wind power grid-connection soft-switching converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377196A (en) * | 2010-08-18 | 2012-03-14 | Abb公司 | Line and neutral point clamped inverter |
| CN102377194A (en) * | 2010-08-12 | 2012-03-14 | 北京动力机械研究所 | Wind power generation grid connection switching system and method thereof |
| CN102790568A (en) * | 2012-08-01 | 2012-11-21 | 北京海斯德电机技术有限公司 | Soft start control system for high-speed brushless DC motor |
| CN108988395A (en) * | 2018-10-13 | 2018-12-11 | 曲阜师范大学 | A kind of topological structure and control method of the directly driven wind-powered current transformer of vertical axis permanent magnet |
-
2010
- 2010-02-05 CN CN2010103012483A patent/CN101795082B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377194A (en) * | 2010-08-12 | 2012-03-14 | 北京动力机械研究所 | Wind power generation grid connection switching system and method thereof |
| CN102377196A (en) * | 2010-08-18 | 2012-03-14 | Abb公司 | Line and neutral point clamped inverter |
| CN102790568A (en) * | 2012-08-01 | 2012-11-21 | 北京海斯德电机技术有限公司 | Soft start control system for high-speed brushless DC motor |
| CN102790568B (en) * | 2012-08-01 | 2014-10-15 | 北京海斯德电机技术有限公司 | Soft start control system for high-speed brushless DC motor |
| CN108988395A (en) * | 2018-10-13 | 2018-12-11 | 曲阜师范大学 | A kind of topological structure and control method of the directly driven wind-powered current transformer of vertical axis permanent magnet |
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| Publication number | Publication date |
|---|---|
| CN101795082B (en) | 2012-01-11 |
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Granted publication date: 20120111 Termination date: 20140205 |