CN201226495Y - Wind power generation conversion apparatus through composite connection of power units - Google Patents
Wind power generation conversion apparatus through composite connection of power units Download PDFInfo
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- CN201226495Y CN201226495Y CNU2008201177884U CN200820117788U CN201226495Y CN 201226495 Y CN201226495 Y CN 201226495Y CN U2008201177884 U CNU2008201177884 U CN U2008201177884U CN 200820117788 U CN200820117788 U CN 200820117788U CN 201226495 Y CN201226495 Y CN 201226495Y
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Abstract
The utility model relates to a wind power generation power conversion device adopting the compound joining mode of power units. The wind power generation power conversion device comprises a wind-driven generator, three power unit groups connected with the wind-driven generator, and an output transformer connected with the three power unit groups. The wind-driven generator is provided with two groups of triphase outputs which are connected with the two groups of triphase input ends of each power unit. N (N is more than or equal to 1) power units constitute one power unit group. The output of each power unit inside the power unit group is connected with one primary winding of one phase of the output transformer. The output transformer is a three-phase transformer, and each phase of the three-phase transformer is provided with N primary windings and one secondary winding. The primary windings of the same phase are not connected with each other. After the secondary windings of the three phases are connected into a star shape or triangular shape, the secondary windings are directly connected with a grid. The wind power generation power conversion device is in particular applicable to high-power wind power generation systems, in particular to wind power generation systems of more than 1.5MW. The wind power generation power conversion device has the advantages of low cost, high reliability, small output harmonic waves, adjustable output power factors and so on.
Description
(1) technical field
The utility model belongs to energy technology field, is specifically related to the wind power generation power-converting device of the compound connecting mode of a kind of power cell.
(2) background technology
The oil crisis of the seventies in 20th century and thing followed environmental problem force people to think deeply the problem of utilizing of regenerative resource.Because wind energy is a kind of reproducible natural resources that does not produce any pollutant, wind generating technology is comparatively ripe at present, therefore wind energy tool in numerous regenerative resources prospect of generating electricity on a large scale also is the main new power source of 21 century human social economy's sustainable development.
Wind generating technology is the development through several generations in China, now enters the epoch of directly driving comprehensively, and current mainstream model is 1.5MW, and develops to 2MW, 3MW.
Because the power of the electronic power convertor in the direct drive type wind generating technology equates with generator capacity, therefore along with the continuous expansion of wind-driven generator single-machine capacity, the capacity of current transformer is also increasing, the current transformer of current direct drive type wind generating equipment generally adopts, and to be the output that exchanges 690V or exchange 620V through transformer boost is incorporated into the power networks for 10KV or 35KV, cause the current transformer output current very big, realize that difficulty is bigger, so the implementation of the product of current power more than 1.2MW mostly adopts the mode of inverter bridge leg parallel connection, but this mode need increase the output current sharing inductor, system cost is increased, system effectiveness descends, under the situation that continues to strengthen when the wind-driven generator single-machine capacity, the technical difficulty of prior art scheme is increasing, and its shortcoming is obvious further.
(3) summary of the invention
The purpose of this utility model is to provide the wind power generation power-converting device of the compound connecting mode of a kind of power cell.
The utility model is achieved in that it comprises wind-driven generator, 3 power cell groups and output transformer, wind-driven generator has two groups of three-phase outputs, link to each other with two groups of three-phase input ends of each power cell respectively, the individual power cell of N (N 〉=1) constitutes a power cell group, the output of each power cell connects a former limit winding of output transformer one phase in the power cell group, output transformer is a three-phase transformer, it is every N (N 〉=1) former limit winding and a secondary winding mutually, the former limit of each of same phase winding does not connect mutually, directly is incorporated into the power networks after three-phase secondary winding is connected into star or triangle.
The utility model also has some such architectural features:
1, power cell is partly connected in the output inversion by two identical in structure power models and is constituted;
2, in first of described power cell kind of implementation, power model partly is made up of rectifying part, boost chopper part and inversion; Described rectifying part by the three-phase bridge diode not control rectifying circuit form; Described boost chopper part 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, energy storage inductor stopcock device, diode and output bus capacitor, energy storage inductor and diode are connected in series, energy storage inductor and diode series connection node place full control switching device in parallel, the head and the tail two ends of energy storage inductor and diode branch are parallel voltage-stabilizing capacitor and output bus capacitor respectively;
3, in second of described power cell kind of implementation, power model is made up of three-phase input reactance device, three-phase full-bridge controlled rectifier, filtering capacitor and the controlled inverter circuit of single-phase full bridge, three-phase input reactance device connects the three-phase input end of three-phase full-bridge controlled rectifier, the output of three-phase full-bridge controlled rectifier filtering capacitor in parallel, the controlled inverter circuit of filtering capacitor two ends single-phase full bridge in parallel;
4, described three-phase full-bridge controlled rectifier is formed in parallel by the three-phase brachium pontis, each brachium pontis is made of the series connection of two full control switching devices, the intermediate point of series connection is as an input mutually of rectification circuit, and each switching device parallel connection is fly-wheel diode oppositely, and switching device adopts IGBT or IGCT;
5, the controlled inversion part of described single-phase full bridge is formed in parallel by two groups of brachium pontis, each brachium pontis is in series by two full control switching devices (band fly-wheel diode), the intermediate point of series connection is as the output of each power model, another output of another power model of output and this power cell of each power model directly links to each other, and two outputs of all the other of two power models are as the output of whole power cell; Described power cell is partly to be in series in the output inversion by two duplicate power models.
The utility model is owing to adopt the conversion of a plurality of power cells difference finally to realize technical scheme in parallel by output transformer, the output voltage of each power cell is lower, power is less, thereby reduced withstand voltage and requirement electric current to power device, can adopt 1200V the most frequently used on the current market or 1700V, the power device that 600A is following, reduce system cost, improved the reliability of system.
Each power cell is partly connected in the output inversion by two identical in structure power models and is constituted, the inversion of each power model partly adopts the single-phase full bridge inverter circuit to constitute, can realize the output of three level, after superposeing through phase shift, the output of two power models can realize the output effect of five level, compare with current two level circuits that generally adopt, its output harmonic wave can significantly reduce, and the switching frequency of each power device has also reduced, and has reduced the loss of system.
The three-phase output of converting means is incorporated into the power networks by output transformer, because there is leakage inductance in transformer, the output voltage of control change device just can realize the surfing the Net power factor of electric energy is controlled, can regulate the power factor of this converting means output according to the power factor situation of electrical network, guarantee the quality of power supply of electrical network.
Two kinds of implementations of the utility model converting means all can be realized when the output voltage of wind-driven generator changes, the DC bus-bar voltage of power model remains unchanged substantially, thereby has guaranteed that wind power generation plant all can have the high-quality electric energy output of being incorporated into the power networks in bigger wind speed excursion.
(4) description of drawings
Fig. 1 is the wind power generation power-converting device schematic diagram of the compound connecting mode of power cell described in the utility model.
Fig. 2 is first kind of implementation schematic diagram of power cell described in the utility model.
Fig. 3 is second kind of implementation schematic diagram of power cell described in the utility model.
(5) embodiment
For a more detailed description below in conjunction with Fig. 1-3 and concrete enforcement to the utility model:
In conjunction with Fig. 1, two groups of three-phase outputs of wind-driven generator Gen are connected respectively to power cell A
N～A
1, B
N～B
1And C
N～C
1Input, power cell A
N～A
1, B
N～B
1And C
N～C
1Output be connected respectively to former limit L1N～L11, L2N～L21 and the L3N～L31 of output transformer, three-phase secondary AX, the BY of output transformer with directly be incorporated into the power networks after CZ is connected by Y-connection or triangle.
Embodiment 1:
In conjunction with Fig. 2, in first kind of implementation of power cell, two groups of three-phase outputs of wind-driven generator connect input A01, B01, C01 and A02, B02, the C02 of two power models respectively, the output U01 of two power models and U02 directly link to each other and two power models are together in series constitute a power cell, and two other output U11 of two power models and U12 are as the output of power cell.Each power model comprises rectifying part, boost chopper part and inversion part again.
The specific implementation of the rectifying part of power model is with six diodes (D11～D16) be divided into a group in twos, be respectively D11 and D14, D13 and D16, D15 and D12, two devices in every group join end to end and constitute three groups of brachium pontis then, the three-phase input is connected to intermediate point A01, B01, the C01 of three groups of brachium pontis respectively in turn, forms not control rectifying circuit of three-phase bridge.
Boost chopper part in the power model is connected in parallel by at least one boost chopper, each boost chopper comprises full control switching element T 1, diode D17 and the output bus capacitor C12 of front end voltage regulation capacitor C11, energy storage inductor L11, band sustained diode 1, energy storage inductor L11 and diode D17 are connected in series, the series connection node place of energy storage inductor L11 and diode D17 full control switching element T 1 in parallel, the head and the tail two ends of energy storage inductor L11 and diode D17 series arm are parallel voltage-stabilizing capacitor C11 and output bus capacitor C12 respectively.Output bus capacitor C12 two ends parallel inverter part in the boost chopper.
Inversion in power model part by four device for power switching (T11～T14) and with the antiparallel fly-wheel diode of each device for power switching (D11～D14) form, one group in twos of four switching tube, be respectively T11 and T14, T13 and T12, two switching tubes in every group are joined end to end form two groups of brachium pontis, the intermediate point U01 of brachium pontis, U11 is as the output of power model, thereby the output U01 of two power models directly linked to each other with U02 becomes a power cell with being connected in series of two power models, and the output U11 of two power models links to each other with the two ends of a former limit winding of output transformer as the output of power cell with U12.
Embodiment 2:
In conjunction with Fig. 3, the output of two groups of three-phases of wind-driven generator connects the input side of two power models respectively by three-phase reactor, and the output U01 of power model links to each other with U02 two power models power cell of formation that is together in series.Each power model comprises three-phase input reactance device, three-phase full-bridge controlled rectifier, filtering capacitor and single-phase full bridge inverter circuit.
The output of wind-driven generator three-phase is connected to intermediate point A11, B11, the C11 of three brachium pontis of three-phase full-bridge controlled rectifier through three-phase reactor LA1, LB1 and LC1.Three-phase full-bridge controlled rectifier is by the device for power switching (T31～T36) form of six band fly-wheel diodes, six device for power switching are divided into one group in twos, be respectively T31 and T34, T33 and T36, T35 and T32, two devices in every group join end to end and constitute three groups of brachium pontis, last group brachium pontis two ends filtering capacitor C31 in parallel, the two ends of capacitor C31 are the parallel inverter circuit again.
Inverter circuit in the power model by four device for power switching (T41～T44) and with the antiparallel fly-wheel diode of each device for power switching (D41～D44) form, one group in twos of four device for power switching, be respectively T41 and T44, T43 and T42, two device for power switching in every group are joined end to end form two groups of brachium pontis, the intermediate point U011 of brachium pontis, U21 is as the output of power model, thereby the output U011 of two power models and U022 directly linked to each other two power models are connected in series becomes a power cell, and the output U21 of two power models links to each other with the two ends of a former limit winding of output transformer as the output of power cell with U22.
Embodiment 2 is with the main distinction of embodiment 1, embodiment 1 adopts diode not control the mode that rectification adds boost chopper to realize keeping under the situation that the output AC voltage amplitude changes the DC bus-bar voltage amplitude of power model constant substantially, this scheme realizes simple, cost is lower, but need realize the purpose little to the harmonic effects of wind-driven generator in conjunction with the output phase shift technology of wind-driven generator.2 modes that directly adopt full-controlled rectifier of embodiment, can realize the stable DC busbar voltage and improve input power factor and the purpose of reduction input harmonics by the operating state of controlling six device for power switching, this scheme does not have the phase shift requirement to generator, but control is complicated, and cost is higher.
Claims (3)
1, the wind power generation power-converting device of the compound connecting mode of a kind of power cell, it comprises wind-driven generator, it is characterized in that it also comprises 3 power cell groups and the output transformer that links to each other with wind-driven generator, wind-driven generator has two groups of three-phase outputs, link to each other with two groups of three-phase input ends of each power cell respectively, the individual power cell of N (N 〉=1) constitutes a power cell group, the output of each power cell connects a former limit winding of output transformer one phase in the power cell group, output transformer is a three-phase transformer, every have N (N 〉=1) former limit winding and a secondary winding mutually, the former limit of each of same phase winding does not connect mutually, directly is incorporated into the power networks after three-phase secondary winding is connected into star or triangle.
2, the wind power generation power-converting device of the compound connecting mode of a kind of power cell according to claim 1, it is characterized in that: first kind of implementation of described power cell, power cell is partly connected in the output inversion by two identical in structure power models and is constituted, each power model comprises rectifying part, boost chopper part and inversion part, one group of independence three-phase output of wind-driven generator connects rectifying part, rectifying part connects the boost chopper part, boost chopper partly connects the inversion part, rectifying part by the three-phase bridge diode not control rectifying circuit form, the boost chopper part 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, energy storage inductor, full control switching device, diode and output bus capacitor, energy storage inductor and diode are connected in series, energy storage inductor and diode series connection node place full control switching device in parallel, the head and the tail two ends of energy storage inductor and diode branch are parallel voltage-stabilizing capacitor and output bus capacitor respectively; The inversion part is made of a controlled inverter circuit of single-phase full bridge, the controlled inverter circuit of single-phase full bridge is formed in parallel by two groups of brachium pontis, each brachium pontis is in series by two full control switching devices, the intermediate point of series connection is as the output of each power model, another output of another power model of output and this power cell of each power model directly links to each other, and two outputs of all the other of two power models are as the output of whole power cell.
3, the wind power generation power-converting device of the compound connecting mode of a kind of power cell according to claim 1, it is characterized in that: second kind of implementation of described power cell, power cell is partly connected in the output inversion by two identical in structure power models and is constituted, each power model is by three-phase input reactance device, three-phase full-bridge controlled rectifier, the controlled inverter circuit of filtering capacitor and single-phase full bridge is formed, three-phase input reactance device connects the three-phase input end of three-phase full-bridge controlled rectifier, the output of three-phase full-bridge controlled rectifier filtering capacitor in parallel, the controlled inverter circuit of filtering capacitor two ends single-phase full bridge in parallel, wherein three-phase full-bridge controlled rectifier is formed in parallel by the three-phase brachium pontis, each brachium pontis is made of the series connection of two full control switching devices, the intermediate point of series connection is as an input mutually of rectification circuit, each switching device oppositely fly-wheel diode in parallel, switching device adopts IGBT or IGCT; The controlled inversion part of single-phase full bridge is formed in parallel by two groups of brachium pontis, each brachium pontis is in series by two full control switching devices, the intermediate point of series connection is as the output of each power model, another output of another power model of output and this power cell of each power model directly links to each other, and two outputs of all the other of two power models are as the output of whole power cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201177884U CN201226495Y (en) | 2008-06-18 | 2008-06-18 | Wind power generation conversion apparatus through composite connection of power units |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201177884U CN201226495Y (en) | 2008-06-18 | 2008-06-18 | Wind power generation conversion apparatus through composite connection of power units |
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| CN201226495Y true CN201226495Y (en) | 2009-04-22 |
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| CNU2008201177884U Expired - Fee Related CN201226495Y (en) | 2008-06-18 | 2008-06-18 | Wind power generation conversion apparatus through composite connection of power units |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368406A (en) * | 2012-03-29 | 2013-10-23 | 台达电子工业股份有限公司 | Power apparatus |
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2008
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368406A (en) * | 2012-03-29 | 2013-10-23 | 台达电子工业股份有限公司 | Power apparatus |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 Termination date: 20110618 |