CN104467653A - Bipolar photovoltaic system topology structure and application thereof - Google Patents
Bipolar photovoltaic system topology structure and application thereof Download PDFInfo
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- CN104467653A CN104467653A CN201410424621.2A CN201410424621A CN104467653A CN 104467653 A CN104467653 A CN 104467653A CN 201410424621 A CN201410424621 A CN 201410424621A CN 104467653 A CN104467653 A CN 104467653A
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- photovoltaic
- booster circuit
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- inverter
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- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000003491 array Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000002015 acyclic group Chemical group 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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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
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a bipolar photovoltaic system topology structure. The bipolar photovoltaic system topology structure comprises a positive direct-current transmission line and a negative direct-current transmission line, and further comprises two photovoltaic inverters connected in parallel and a boosting transformer. Each photovoltaic inverter comprises a booster circuit, a direct-current bus, a three-phase bridge inverter and an alternating-current filter, wherein the booster circuit, the direct-current bus, the three-phase bridge inverter and the alternating-current filter are sequentially arranged in the direct-current voltage transmission direction. The output ends of the two photovoltaic inverters are together connected to the boosting transformers. The designed bipolar photovoltaic system topology structure can operate simultaneously or independently, improves operation reliability and is suitable for a high-power photovoltaic inverter, the power generation efficiency of a photovoltaic array is improved to the maximum degree, the input range of inverter direct-current voltage is enlarged, the utilization rate of photovoltaic array direct-current voltage is increased, switching frequency is equivalently improved, and the harmonic waves of grid connection current are reduced.
Description
Technical field
The present invention relates to field of photovoltaic power generation, particularly a kind of bipolar system photovoltaic system topological structure and application thereof.
Background technology
Solar energy, as the continuable clean energy resource of one, has huge Application and Development potentiality, and the territory illumination of China 76% is abundant, and Luminous energy resource distribution is comparatively even; Compared with water power, wind-powered electricity generation, nuclear power etc., solar power generation is without any discharge and noise, and application technology is ripe, safe and reliable; Except large-scale grid connection generating with from except net application, solar energy can also by drawing water, superconduction, storage battery, the various ways such as hydrogen manufacturing store, solar energy+accumulation of energy almost can meet the following stable energy demand of China.
Along with the change of world energy sources general layout, photovoltaic generation becomes the focus that various countries competitively study, greatly develop day by day; Connected by inverter between photovoltaic array and electrical network, photovoltaic DC-to-AC converter is the indispensable energy conversion link of photovoltaic generation, its Main Function is that the direct current of photovoltaic array is converted to frequency, amplitude stability, meet the electric energy of grid requirements, solve the crossing problem of low-voltage, by maximum power point tracking technology, solar energy can be utilized fully, improve generating efficiency further.
Single large-sized photovoltaic power station, inside have multiple stage inverter, belong to different manufacturer, the direct current system topology of existing photovoltaic plant adopts acyclic type mostly, for traditional MW level photovoltaic inverter system topology, in order to improve the power grade of inverter, easily produce circulation problem according to current transformer parallel connection, circulation flows between the current transformer of parallel connection, its existence adds loss, and reduce system effectiveness, power device is generated heat serious, even burn.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of bipolar system photovoltaic system topological structure is provided, can either runs simultaneously, also singly can overlap independent operating, strengthen reliability of operation, be applicable to high-power photovoltaic inverter, improve the generating efficiency of photovoltaic array to greatest extent, widen inverter direct-current voltage input range, equivalence improves switching frequency, and reduces the harmonic wave of grid-connected current.
In order to solve above technical problem, the invention provides a kind of bipolar system photovoltaic system topological structure, comprise positive and negative DC link, also comprise two groups of photovoltaic DC-to-AC converters in parallel and a step-up transformer, often organize photovoltaic DC-to-AC converter and comprise the booster circuit, DC bus, three-phase bridge inverter and the alternating current filter that set gradually along direct voltage transmission direction, the output of two groups of photovoltaic DC-to-AC converters is connected to step-up transformer jointly.
Technique effect: the present invention adopts dipolar configuration, when DC line generation monopolar D. C fault, fault pole can not produce the overcurrent of DC Line Fault, and do not affect the normal operation of non-faulting pole, now system is switched to monopolar operational mode by normal operation mode; When DC line generation bipolar DC fault, the whole locking of inverter, now the photovoltaic array that connects of direct current and AC network no longer include energy exchange.
Aforesaid bipolar system photovoltaic system topological structure, described step-up transformer is the grid-connected transformer of three-phase three winding.
The present invention have also been devised a kind of application process of bipolar system photovoltaic system topological structure, and choose two photovoltaic arrays, concrete operations type is as follows:
(1) by the positive pole common ground of the negative pole of the first photovoltaic array and the second photovoltaic array, the negative input end of the first booster circuit and the positive input terminal common ground of the second booster circuit, namely first, second photovoltaic array and first, second booster circuit are connected ground connection respectively;
(2) the positive input terminal cable of the positive pole of the negative pole of the first photovoltaic array, the second photovoltaic array, the negative input end of the first booster circuit and the second booster circuit is interconnected, then only need by first, second photovoltaic array series connection ground connection or only by first, second booster circuit series connection ground connection.
A kind of bipolar system photovoltaic system topological structure machine application designed by the present invention, can either run simultaneously, also singly independent operating can be overlapped, strengthen reliability of operation, be applicable to high-power photovoltaic inverter, improve the generating efficiency of photovoltaic array to greatest extent, widen inverter direct-current voltage input range, equivalence improves switching frequency, and reduces the harmonic wave of grid-connected current.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of series connection point difference ground connection in the present invention;
Fig. 2 is the schematic diagram that in the present invention, series connection point cable connects;
Fig. 3 is the schematic diagram that in the present invention, series connection point cable connects.
Embodiment
In the present invention ,+Ud side inverter and-Ud side inverter can use the parallel connection of different capacity grade inverter circuit respectively, thus realize different photovoltaic generating system topological structures, various circuit topological structure general principle is similar, just difference to some extent on inversion circuit, circuit all forms by with lower part: the photovoltaic array that connection in series-parallel uses, direct current transmission circuit, photovoltaic DC-to-AC converter, alternating current filter and grid-connected transformer;
As shown in Figure 1, a kind of bipolar system photovoltaic system topological structure designed by the present invention, can either run simultaneously, also singly can overlap independent operating, strengthen reliability of operation, be applicable to high-power photovoltaic inverter, improve the generating efficiency of photovoltaic array to greatest extent, widened inverter direct-current voltage input range, equivalence improves switching frequency, and reduces the harmonic wave of grid-connected current.
In bipolar system photovoltaic system topological structure designed by the present invention, photovoltaic array forms two groups after connection in series-parallel, and between two groups, series connection uses, series connection node G1 ground connection, exports bus direct voltage positive and negative polarities; The bipolarity direct voltage that array exports by photovoltaic DC-to-AC converter is reverse into two-way three-phase alternating voltage, and this part comprises two-way inversion circuit, and each inversion circuit is made up of DC capacitor, DC filter, stepup transformer, PWM inverter, alternating current filter; The DC side string neutral point G2 ground connection of inverter, AC exports two-way three-phase current by filter, connects two windings of the grid-connected transformer primary side of three winding.The three-phase alternating voltage that inversion goes out by grid-connected transformer boosts to 10kV or 35kV and is incorporated to bulk power grid;
Inverter direct-flow side is bipolar structure, and photovoltaic array DC loop is by the series connection of G1 point, and G1 point ground connection, the DC loop of inverter is connected by G2 point, if do not have cable to connect between G1 point and G2, then and G2 point ground connection, as shown in Figure 1; If there is cable to connect, then G2 point is without the need to ground connection, as shown in Figures 2 and 3; Thus without the need to improving the insulation voltage grade of photovoltaic array, inverter and whole system, DC loop voltage is ± Ud.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (3)
1. a bipolar system photovoltaic system topological structure, comprise positive and negative DC link, it is characterized in that, also comprise two groups of photovoltaic DC-to-AC converters in parallel and a step-up transformer, often organize photovoltaic DC-to-AC converter comprise set gradually along direct voltage transmission direction booster circuit, namely comprise the first booster circuit and the second booster circuit, DC bus, three-phase bridge inverter and alternating current filter, the output of two groups of photovoltaic DC-to-AC converters is connected to step-up transformer jointly.
2. bipolar system photovoltaic system topological structure according to claim 1, is characterized in that, described step-up transformer is the grid-connected transformer of three-phase three winding.
3. based on the application process of the bipolar system photovoltaic system topological structure in claim 1 or 2 described in any one claim, it is characterized in that, choose two photovoltaic arrays, concrete operations type is as follows:
(1) by the positive pole common ground of the negative pole of the first photovoltaic array and the second photovoltaic array, the negative input end of the first booster circuit and the positive input terminal common ground of the second booster circuit, namely first, second photovoltaic array and first, second booster circuit are connected ground connection respectively;
(2) the positive input terminal cable of the positive pole of the negative pole of the first photovoltaic array, the second photovoltaic array, the negative input end of the first booster circuit and the second booster circuit is interconnected, then only need by first, second photovoltaic array series connection ground connection or only by first, second booster circuit series connection ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410424621.2A CN104467653A (en) | 2014-08-27 | 2014-08-27 | Bipolar photovoltaic system topology structure and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410424621.2A CN104467653A (en) | 2014-08-27 | 2014-08-27 | Bipolar photovoltaic system topology structure and application thereof |
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| CN104467653A true CN104467653A (en) | 2015-03-25 |
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| CN201410424621.2A Pending CN104467653A (en) | 2014-08-27 | 2014-08-27 | Bipolar photovoltaic system topology structure and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572383A (en) * | 2021-06-16 | 2021-10-29 | 江苏固德威电源科技股份有限公司 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
| WO2022126351A1 (en) * | 2020-12-15 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system, protection method, and inverter system |
-
2014
- 2014-08-27 CN CN201410424621.2A patent/CN104467653A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022126351A1 (en) * | 2020-12-15 | 2022-06-23 | 华为数字能源技术有限公司 | Photovoltaic system, protection method, and inverter system |
| CN113572383A (en) * | 2021-06-16 | 2021-10-29 | 江苏固德威电源科技股份有限公司 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
| CN113572383B (en) * | 2021-06-16 | 2023-03-03 | 固德威技术股份有限公司 | Photovoltaic power generation inversion system and photovoltaic power generation inversion control method |
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