CN102904275A - New energy grid connection system and achieving method thereof - Google Patents
New energy grid connection system and achieving method thereof Download PDFInfo
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- CN102904275A CN102904275A CN2012103387515A CN201210338751A CN102904275A CN 102904275 A CN102904275 A CN 102904275A CN 2012103387515 A CN2012103387515 A CN 2012103387515A CN 201210338751 A CN201210338751 A CN 201210338751A CN 102904275 A CN102904275 A CN 102904275A
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Abstract
The invention relates to a new energy grid connection system which comprises at least one new energy electric field, at least one voltage source converter (VSC) rectifier, a direct-current busbar, at least one VSC inverter, a resonance boosting rectifying link and a resonance voltage reduction link. The at least one new energy electric field is connected with the direct-current busbar respectively through at least one VSC; the direct-current busbar is connected with the resonance boosting rectifying link; the resonance boosting rectifying link is connected with the resonance voltage reduction link through a direct-current cable or a direct-current transmission line; and the resonance voltage reduction link is connected with the at least one VSC inverter through the direct-current busbar. The resonance boosting rectifying link and the resonance voltage reduction link are applied to the new energy grid connection system, and the resonance links are large disposable equipment, easy and convenient to design and manufacture, easy to control, and capable of reducing technological difficulty and reducing cost. The problem that high-voltage high-capacity VSC and direct current to direct current (DC/DC) links are high in manufacture cost and difficult to design in the new energy grid connection system is solved, a brand new technological path is provided for the new energy grid connection.
Description
Technical field
The present invention relates to system and its implementation of a kind of field of power electronics, be specifically related to a kind of new-energy grid-connected system and its implementation.
Background technology
In today of energy shortage and the deterioration of environment trend, greatly developing new forms of energy is the present prior development directions of China, the also net mode of new forms of energy mainly is the application flexibility HVDC Transmission Technology at present, owing to limited by natural environment, the selection of new forms of energy electric field tends to away from the electric loading concentrated area, need to carry out long-distance transmissions to electric energy.
The canonical system of new-energy grid-connected mode is shown in accompanying drawing 1, accompanying drawing 2 at present.The operation logic of first kind of way is: the new forms of energy electric field is connected with ac bus by bi-directional frequency converter, link to each other with the VSC rectifier by step-up transformer, by direct current cables or transmission line electric energy is sent to the electrical network location, and links to each other with electrical network by the VSC inverter.It is new forms of energy electric field-two way convertor-transformer-ac bus-step-up transformer-VSC rectifier-direct current cables/transmission line-VSC inverter-transformer-electrical network.The operation logic of the second way is: a plurality of small-sized new forms of energy electric fields link to each other with dc bus by the VSC rectifier, dc bus connects the DC/DC link of boosting, after direct voltage raise by direct current cables or transmission line with delivery of electrical energy to the electrical network location, and carry out the DC/DC step-down, being connected with a plurality of VSC inverters by dc bus after the step-down, is to be connected with electrical network behind the alternating current with dc inverter.Be a plurality of new forms of energy electric fields-a plurality of VSC rectifier-direct current networks-DC/DC link-direct current cables/transmission line-DC/DC step-down link-dc bus-a plurality of VSC inverter-electrical networks that boost.Dual mode can both effectively be incorporated into the power networks electric energy, but high-voltage large-capacity VSC rectifier and inverter have and involve great expense, and it is complicated that the characteristics such as control system complexity, DC/DC link also have design, the shortcoming that reliability is low.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of new-energy grid-connected system and its implementation, the present invention is applied to resonance step-up and resonance step-down link in the new-energy grid-connected system, the resonance link is large-scale primary equipment, design and manufacture is easy, control is simple, not only can reduce technical difficulty, and can reduce cost; Solved the problem of the present new-energy grid-connected large capacity VSC of system's mesohigh and DC/DC link cost height and difficult design, for new-energy grid-connected provides a kind of brand-new technology path.
The objective of the invention is to adopt following technical proposals to realize:
A kind of new-energy grid-connected system, described system comprises at least one new forms of energy electric field, at least one VSC rectifier, dc bus, at least one VSC inverter, its improvements are that described system comprises resonance step-up link and resonance step-down link;
Described at least one new forms of energy electric field is connected with dc bus by at least one VSC respectively; Described dc bus is connected with the resonance step-up link; Described resonance step-up link is connected with described resonance step-down link by direct current cables or DC link;
Described resonance step-down link is connected with at least one VSC inverter by dc bus.
Wherein, described resonance step-up link is connected with the rectification link.
Wherein, described at least one VSC inverter is connected with electrical network.
The implementation method of a kind of new-energy grid-connected system that the present invention is based on that another purpose provides, its improvements are that described implementation method comprises the steps:
A, at least one new forms of energy electric field boost by described resonance step-up link after being connected with dc bus by the VSC rectifier respectively;
B, the magnitude of voltage after boosting change forward voltage values into through the rectification link;
C, described forward voltage values are transferred to behind the electrical network through the step-down of resonance step-down link by direct current cables or DC transmission line;
Direct voltage after D, the step-down is connected respectively with the VSC inverter of at least one by dc bus, is alternating voltage with the direct voltage inversion;
E, described AC voltages transmission are to electrical network.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, in new-energy grid-connected system provided by the invention and its implementation, the resonance buck link of employing is mainly used the main equipment simplicity of design No. one time, and is easy to manufacture;
2, the semiconductor device that adopts of the resonance link in the new-energy grid-connected provided by the invention system is half control type device, compares to the full-control type device, controls easy;
3, in the new-energy grid-connected provided by the invention system, use large-scale primary equipment and half control type device and replace the full-control type device, operational reliability is high.
Description of drawings
Fig. 1 is the canonical system figure () of present new-energy grid-connected mode;
Fig. 2 is the canonical system figure (two) of present new-energy grid-connected mode;
Fig. 3 is new-energy grid-connected system diagram provided by the invention;
Fig. 4 is the resonance link monopole operating mode schematic diagram of specific embodiment provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
New-energy grid-connected provided by the invention system as shown in Figure 3, this system comprises a plurality of new forms of energy electric fields, a plurality of VSC rectifier, dc bus, a plurality of VSC inverter, this system also comprises resonance step-up link and resonance step-down link;
Described a plurality of new forms of energy electric field is connected with dc bus by a plurality of VSC respectively; Described dc bus is connected with the resonance step-up link; Described resonance step-up link is connected with described resonance step-down link by direct current cables or DC link;
Resonance step-down link is connected with a plurality of VSC inverters by dc bus.A plurality of VSC inverters are connected with electrical network.The resonance step-up link is connected with the rectification link.
Resonance step-up link provided by the invention and resonance step-down link can be monopole operating mode and bipolar operational mode; Wherein, in every kind of operational mode, the resonance link can be single resonance link structure, also can save cascaded structure or resonance link parallel-connection structure for resonant ring.
Embodiment
The resonance link monopole operating mode schematic diagram of specific embodiment provided by the invention as shown in Figure 4.
The resonance step-up link comprises DC power supply DC, the large capacitor C 10 of low pressure, the little capacitor C 11 of high pressure, thyristor T11, thyristor T13 and resonance reactor L11; The large capacitor C 10 of low pressure, thyristor T11, resonance reactor L11 are connected capacitor C 11 and connect successively with high pressure; DC power supply DC is connected in parallel on the large capacitor C of low pressure 10 two ends; Thyristor T13 is connected in parallel on the little capacitor C 11 of high pressure and resonance reactor L11 two ends.
Resonance step-down link comprises DC power supply DC, capacitor C 20, the little capacitor C 21 of high pressure, the large capacitor C 22 of low pressure, thyristor T21, thyristor T22, thyristor T23, reactor L21, reactor L22 and load resistance R2; Capacitor C 20, thyristor T21 are connected with reactor L21 and are connected; Described thyristor T22, reactor L22 are connected capacitor C 22 and connect successively with low pressure; DC power supply DC is connected in parallel on capacitor C 20 two ends; Thyristor T23 is connected in parallel on capacitor C 20 and thyristor T21 two ends; Thyristor T23, reactor L21 are connected capacitor C 21 and connect successively with high pressure; The little capacitor C 21 of high pressure is connected in parallel on capacitor C 20, thyristor T21 and reactor L21 two ends; Load resistance R2 is connected in parallel on the large capacitor C of low pressure 22 two ends.
The rectification link comprises half-wave rectifier bridge D11, smoothing reactor L12, support capacitor C12 and sustained diode 12; Wherein half-wave rectifier bridge D11, smoothing reactor L12 are connected successively with support capacitor C12; Sustained diode 12 is connected in parallel on smoothing reactor L12 and support capacitor C12 two ends.
The implementation method of new-energy grid-connected system comprises the steps: that A, a plurality of new forms of energy electric field link to each other with dc bus by the VSC rectifier, and dc bus connects the resonance step-up link and boosts; B, voltage waveform are the positive and negative wave of oscillation that increases gradually, because the loss stability principle, voltage stabilization through the rectification link, changes output voltage into forward dc voltage at certain value; C, by direct current cables or transmission line with delivery of electrical energy to the electrical network location; D, connection resonance step-down link are connected with a plurality of VSC inverters by dc bus after the step-down, are alternating current with dc inverter; E, alternating voltage access electrical network are successfully completed new-energy grid-connected.Be a plurality of new forms of energy electric fields-a plurality of VSC rectifier-direct current networks-resonance step-up rectification link-direct current cables-resonance step-down link-dc bus-a plurality of VSC inverter-electrical networks.
The large electric capacity of low pressure described in the invention and the little electric capacity of high pressure are comparatively speaking, and it is below the 10kV that the large electric capacity of low pressure bears voltage, and more than the capacitance 5000uF, the little electric capacity of high pressure bears more than the voltage 10kV, below the capacitance 1000uF.
New-energy grid-connected system provided by the invention and its implementation replace the DC/DC link with the resonance link, have both reduced technical difficulty, have saved again cost.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1. new-energy grid-connected system, described system comprises at least one new forms of energy electric field, at least one VSC rectifier, dc bus, at least one VSC inverter, it is characterized in that, described system comprises resonance step-up link and resonance step-down link;
Described at least one new forms of energy electric field is connected with dc bus by at least one VSC respectively; Described dc bus is connected with the resonance step-up link; Described resonance step-up link is connected with described resonance step-down link by direct current cables or DC link;
Described resonance step-down link is connected with at least one VSC inverter by dc bus.
2. new-energy grid-connected as claimed in claim 1 system is characterized in that described resonance step-up link is connected with the rectification link.
3. new-energy grid-connected as claimed in claim 1 system is characterized in that described at least one VSC inverter is connected with electrical network.
4. the implementation method of a new-energy grid-connected system is characterized in that, described implementation method comprises the steps:
A, at least one new forms of energy electric field boost by described resonance step-up link after being connected with dc bus by the VSC rectifier respectively;
B, the magnitude of voltage after boosting change forward voltage values into through the rectification link;
C, described forward voltage values are transferred to behind the electrical network through the step-down of resonance step-down link by direct current cables or DC transmission line;
Direct voltage after D, the step-down is connected respectively with the VSC inverter of at least one by dc bus, is alternating voltage with the direct voltage inversion;
E, described AC voltages transmission are to electrical network.
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| CN201210338751.5A CN102904275B (en) | 2012-09-13 | 2012-09-13 | New energy grid connection system and achieving method thereof |
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| CN201210338751.5A CN102904275B (en) | 2012-09-13 | 2012-09-13 | New energy grid connection system and achieving method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105990829A (en) * | 2015-02-05 | 2016-10-05 | 国家电网公司 | LCC-VSC hybrid direct-current power grid testing model |
| CN108063443A (en) * | 2016-11-05 | 2018-05-22 | 南京理工大学 | A kind of alternating current-direct current bi-directional power conversion control method |
| CN110889081A (en) * | 2019-11-25 | 2020-03-17 | 国网河南省电力公司驻马店供电公司 | Method for quickly acquiring harmonic resonance of new energy grid-connected system |
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| CN102142688A (en) * | 2010-01-29 | 2011-08-03 | 西门子公司 | Electric power grid connecting system as well as electric power transmission system and method |
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| CN102904276A (en) * | 2012-09-13 | 2013-01-30 | 国网智能电网研究院 | Resonance voltage boosting and reducing device used for new energy grid connection and implementation method thereof |
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2012
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| US20040125618A1 (en) * | 2002-12-26 | 2004-07-01 | Michael De Rooij | Multiple energy-source power converter system |
| CN102142688A (en) * | 2010-01-29 | 2011-08-03 | 西门子公司 | Electric power grid connecting system as well as electric power transmission system and method |
| CN102611355A (en) * | 2012-03-13 | 2012-07-25 | 特变电工新疆新能源股份有限公司 | Photovoltaic array combiner box |
| CN102904276A (en) * | 2012-09-13 | 2013-01-30 | 国网智能电网研究院 | Resonance voltage boosting and reducing device used for new energy grid connection and implementation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105990829A (en) * | 2015-02-05 | 2016-10-05 | 国家电网公司 | LCC-VSC hybrid direct-current power grid testing model |
| CN105990829B (en) * | 2015-02-05 | 2021-01-01 | 国家电网公司 | LCC-VSC hybrid direct current power grid test model |
| CN108063443A (en) * | 2016-11-05 | 2018-05-22 | 南京理工大学 | A kind of alternating current-direct current bi-directional power conversion control method |
| CN110889081A (en) * | 2019-11-25 | 2020-03-17 | 国网河南省电力公司驻马店供电公司 | Method for quickly acquiring harmonic resonance of new energy grid-connected system |
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| CN102904275B (en) | 2015-04-01 |
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Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: State Grid Corporation of China Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Co-patentee before: State Grid Corporation of China Patentee before: STATE GRID SMART GRID Research Institute |
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Effective date of registration: 20170427 Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: State Grid Corporation of China Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Co-patentee after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee before: State Grid Corporation of China Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE |