CN103368201A - High-voltage direct current transmission type grid-tied photovoltaic power generation system - Google Patents
High-voltage direct current transmission type grid-tied photovoltaic power generation system Download PDFInfo
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- CN103368201A CN103368201A CN2013102543309A CN201310254330A CN103368201A CN 103368201 A CN103368201 A CN 103368201A CN 2013102543309 A CN2013102543309 A CN 2013102543309A CN 201310254330 A CN201310254330 A CN 201310254330A CN 103368201 A CN103368201 A CN 103368201A
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Abstract
The invention discloses a high-voltage direct current transmission type grid-tied photovoltaic power generation system, which comprises more than one photovoltaic direct current booster station, a high-voltage direct current transmission line, a third-level DC/AC converter, a transformer and a high-voltage alternating current grid, the photovoltaic direct current booster stations are connected with the input end of the third-level DC/AC converter via the high-voltage direct current transmission line, and the output end of the third-level DC/AC converter is connected with the high-voltage alternating current grid via the transformer. The high-voltage direct current transmission type grid-tied photovoltaic power generation system has the advantages of simple and compact structure, low cost, convenience in installing and use, high efficiency, wide application range and the like.
Description
Technical field
The present invention is mainly concerned with the photovoltaic power generation equipment field, refers in particular to a kind of high voltage direct current transmission type grid-connected photovoltaic power generation system.
Background technology
Along with the continuous aggravation of energy crisis, weather, environmental problem day by day serious, the development and utilization of new forms of energy is extremely urgent.Japan's violent earthquake causes seriously leakage accident of Fukushima nuclear radiation, again causes the whole world to the self-examination of Nuclear Safety, and Germany will close down in 2022 last nuclear power station; China has also re-started security evaluation to planning newly-built nuclear power station.
The thing followed is that the regenerative resources such as photovoltaic generation, wind-powered electricity generation have been subject to generally showing great attention to of the whole world.In March, 2009 " about accelerating to advance the implementation guideline of solar photoelectric Application in Building ", " solar photoelectric Application in Building financial aid capital management Tentative Measures " are put into effect, the enforcement in July, 2009 " about implementing the notice of golden sun demonstration project ", the rate for incorporation into the power network of 1 yuan/degree of the formal issue of National Development and Reform Committee's on August 1st, 2011 non-bid photovoltaic project unified implementation, the fast development in domestic photovoltaic market has been accelerated in the enforcement of above-mentioned policy.
Photovoltaic generation mainly is that to utilize semi-conductive " photovoltage " effect be transform light energy electric energy, grid-connected photovoltaic system refers to by solar module sunlight is converted to direct current energy, by inverter direct current is converted to the alternating current that the quality of power supply satisfies the electrical network demand again, at last by step-up transformer or directly be connected with electrical network.Because adopting more, existing electric power system exchanges transmission, and the photovoltaic generation generation is direct current, therefore must be converted to alternating current to the direct current that photovoltaic generation produces by current transformer, simultaneously because the dispersiveness of solar energy and the voltage endurance capability restriction of photovoltaic cell component etc., it is wide to cause the large-sized photovoltaic power station to have floor space, the direct current system electric pressure is low, and (maximum open circuit voltage is below 1000V, long-term work voltage is about 700V), and the large-sized photovoltaic power station modes (adopt 1MW is a photovoltaic generation unit more) that are incorporated into the power networks of concentrating that adopt so just cause existing large-sized photovoltaic power station to have the large shortcoming of direct current loss more.Affected by the photovoltaic generating system direct voltage, the ac output voltage of existing photovoltaic combining inverter mostly is 270V and 315V, and mostly the large-sized photovoltaic power station is by 35kV and the outside transmission of electric energy of above power transmission network, cause and just can finish the transmission of electricity of being incorporated into the power networks of photovoltaic combining inverter through the two-stage link of boosting, the step-up transformer of the link of at every turn boosting all can produce loss, has reduced the whole efficiency of photovoltaic generating system; Because the installed capacity in large-sized photovoltaic power station is many more than 10MW, therefore same photovoltaic plant need to use tens of even up to a hundred photovoltaic combining inverter parallel connections, increased the difficulty of power scheduling, and photovoltaic combining inverter is power electronic equipment, can produce certain humorous wave interference to electrical network, many inverter parallels can aggravate the extent of injury of harmonic pollution, have increased the harmonic wave control cost; Build in illumination resourceful northwest desert and Gobi Region owing to the Chinese large-sized photovoltaic plant simultaneously more, from and the site away from, generally from existing grid distant (mostly being tens to kilometers up to a hundred), need to build special high pressure overhead power line, it is higher additionally to build the transmission line cost.And existing transmission of electricity side grid-connected photovoltaic power station is subjected to photovoltaic cell component voltage endurance capability (the highest withstand voltage 1000V) restriction, system's direct voltage grade is many below 1kV, the output voltage of parallel network reverse device is 270V or 315V, by linking to each other with the 10kV ac bus behind the step-up transformer, link to each other with 35kV and above power transmission network by step-up transformer again.
Summary of the invention
The technical problem to be solved in the present invention just is: for the technical problem that prior art exists, the invention provides a kind of simple and compact for structure, with low cost, easy to install, high voltage direct current transmission type grid-connected photovoltaic power generation system that efficient is high, applied widely.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of high voltage direct current transmission type grid-connected photovoltaic power generation system, comprise more than one photovoltaic DC booster stations, HVDC (High Voltage Direct Current) transmission line, third level DC/AC current transformer, transformer and high-voltage alternating net, described photovoltaic DC booster stations link to each other through the input of HVDC (High Voltage Direct Current) transmission line with third level DC/AC current transformer, and the output of described third level DC/AC current transformer links to each other with the high-voltage alternating net through transformer.
As a further improvement on the present invention:
Each described photovoltaic DC booster stations comprises second level DC/DC current transformer and two above DC generation unit.
Each described DC generation unit comprises plural array, plural header box, DC power distribution cabinet, first order DC/DC current transformer, photovoltaic generation unit access switch, each described array all links to each other with DC power distribution cabinet by a header box, and the output of described DC power distribution cabinet links to each other with second level DC/DC current transformer behind first order DC/DC current transformer, photovoltaic generation unit access switch.
Be provided with the energy-storage system of Bands cut-through switch on the circuit between described photovoltaic generation unit access switch and the second level DC/DC current transformer.
When described photovoltaic DC booster stations are two when above, plural photovoltaic DC booster stations are shape in parallel.
Be provided with electric capacity on the described HVDC (High Voltage Direct Current) transmission line.
Compared with prior art, the invention has the advantages that:
1, high voltage direct current transmission type grid-connected photovoltaic power generation system of the present invention, simple and compact for structure, with low cost, easy to install, efficient is high, applied widely, photovoltaic array has promoted photovoltaic generating system direct voltage grade by the first order DC/DC link of boosting, satisfied simultaneously energy-storage system voltage access requirement, when photovoltaic generation is abundant, can charge to energy-storage system; Energy-storage system can excise from system by disconnecting cut-through switch when breaking down, and after fault recovery, can again put into operation; Through behind the first order DC/DC, photovoltaic generation unit is by the photovoltaic power generation grid-connecting capacity that effectively promotes in parallel, through the second level DC/DC link of boosting, reaches the high voltage direct current transmission electric pressure simultaneously, reduces the direct current transportation loss.
2, the present invention can adopt underground or seabed high voltage electric transmission cable to finish the transmission of high voltage direct current electric energy, need not to build special overhead transmission line, has reduced additional investment; By high pressure DC/AC convertor assembly, realize that the high-voltage alternating of photovoltaic generation is incorporated into the power networks, whole system need not to use the alternating electromotive force potential device, has reduced system loss, has promoted photovoltaic efficiency; Simultaneously owing to adopted high voltage dc transmission technology, the conventional high-tension direct current transportation can be used for reference in the grid-connected photovoltaic power generation system in the method for the aspects such as idle, harmonic wave and power generation dispatching, be incorporated into the power networks and the photovoltaic generation economic benefit embodies and has important practical significance for the flexibility of large-scale grid-connected photovoltaic power station.
Description of drawings
Fig. 1 is structural principle schematic diagram of the present invention.
Marginal data
1, photovoltaic DC booster stations; 11, DC generation unit; 12, second level DC/DC current transformer; 111, array; 112, header box; 113, DC power distribution cabinet; 114, first order DC/DC current transformer; 115, photovoltaic generation unit access switch; 116, energy-storage system; 2, HVDC (High Voltage Direct Current) transmission line; 3, third level DC/AC current transformer; 4, transformer; 5, high-voltage alternating net; 6, electric capacity.
Embodiment
Below with reference to Figure of description and specific embodiment the present invention is described in further details.
As shown in Figure 1, high voltage direct current transmission type grid-connected photovoltaic power generation system of the present invention, comprise more than one photovoltaic DC booster stations 1, HVDC (High Voltage Direct Current) transmission line 2, third level DC/AC current transformer 3, transformer 4 and high-voltage alternating net 5, photovoltaic DC booster stations 1 link to each other through the input of HVDC (High Voltage Direct Current) transmission line 2 with third level DC/AC current transformer 3, and the output of third level DC/AC current transformer 3 links to each other with high-voltage alternating net 5 through transformer 4.When photovoltaic DC booster stations 1 are two when above, plural photovoltaic DC booster stations 1 are shape in parallel.
Each photovoltaic DC booster stations 1 comprises second level DC/DC current transformer 12 and plural DC generation unit 11.Each DC generation unit 11 comprises plural array 111, plural header box 112, DC power distribution cabinet 113, first order DC/DC current transformer 114, the energy-storage system 116 of photovoltaic generation unit access switch 115 and Bands cut-through switch, each array 111 all links to each other with DC power distribution cabinet 113 by a header box 112, the output of DC power distribution cabinet 113 is through first order DC/DC current transformer 114, link to each other with second level DC/DC current transformer 12 behind the photovoltaic generation unit access switch 115, the energy-storage system 116 of Bands cut-through switch is connected in photovoltaic generation unit and accesses on the circuit between switch 115 and the second level DC/DC current transformer 12.
In the present embodiment, in HVDC (High Voltage Direct Current) transmission line 2 electric capacity 6 is set.
The present invention promotes the photovoltaic generating system grid connection capacity by adopting the two-stage DC/DC link of boosting to improve photovoltaic generation direct voltage grade by DC generation unit 11 parallel waies.N DC generation unit 11 is connected in parallel in second level DC/DC current transformer 12 and forms photovoltaic DC booster stations 1.The positive pole of photovoltaic DC booster stations 1 links to each other with the positive pole of HVDC (High Voltage Direct Current) transmission line 2, the negative pole of photovoltaic DC booster stations 1 links to each other with the negative pole of HVDC (High Voltage Direct Current) transmission line 2, by being converted into the alternating current that satisfies the electrical network requirement by jumbo third level DC/AC current transformer 3 behind HVDC (High Voltage Direct Current) transmission line 2 transmission and the DC voltage-stabilizing electric capacity, after boosting, transformer 4 accesses the more high-voltage alternating net 5 of voltage levels.
Among the present invention, the unsteady flow link of first order DC/DC current transformer 114 is finished DC boosting and photovoltaic battery array MPPT following function, and the requirement of high voltage direct current transmission electric pressure is satisfied in the link output of boosting of second level DC/DC current transformer 12; Simultaneously in order to guarantee the safety of photovoltaic cell component, two-stage DC/DC unsteady flow link all adopts the high-frequency isolation technology, prevent since the DC/DC outlet side high voltage that fault causes to the infringement of solar photovoltaic battery component.
The output of first order DC/DC current transformer 114 all is connected with photovoltaic generation unit access switch 115, when some or several DC generation unit 11 breaks down, can directly it be cut out from photovoltaic DC booster stations 1, and other DC generation unit 11 still can work, and therefore can not impact whole photovoltaic generating system.After DC generation unit 11 malfunctioning modules are repaired, connect again connecting system thereby can control photovoltaic generation unit access switch 115, can be to system in the process of access yet in the work of other DC generation unit 11 exert an influence.
In the high voltage direct current transmission type grid-connected photovoltaic power generation system by N photovoltaic DC booster stations 1 parallel connection, the positive pole of each photovoltaic DC booster stations 1 outlet side links to each other with the positive pole of HVDC (High Voltage Direct Current) transmission line 2, the negative pole of photovoltaic DC booster stations 1 outlet side links to each other with the negative pole of HVDC (High Voltage Direct Current) transmission line 2, end links to each other with electric capacity 6, can guarantee the voltage stabilization of transmission line end; The input of third level DC/AC current transformer 3 is in parallel with electric capacity 6, guarantee that it operates to the voltage source converter state, the mode of the current transformer employing straight string data converter of power device or modularization multi-level converter (MMC) converts direct current to and satisfies the alternating current that electrical network requires, finish dc inversion, high pressure is incorporated into the power networks and the function such as low voltage crossing, can also realize according to the power scheduling instruction simultaneously meritorious, the Reactive Power Dispatch function of photovoltaic plant; The three-phase alternating current of third level DC/AC current transformer 3 output is connected with high-voltage alternating net 5 by transformer 4, the type selecting of transformer 4 need to consider photovoltaic generating system installed capacity, DC/AC current transformer the output voltage grade and access the factor such as HVDC (High Voltage Direct Current) transmission line electric pressure.
Second level DC/DC current transformer 12 adopts the Bidirectional variable-flow structure; when night or the continuous photovoltaic generating system such as overcast and rainy are shut down; the electric energy that can utilize battery stores in the energy-storage system 116 of Bands cut-through switch is realized high-voltage alternating output through boost link, DC power transmission line transmission and DC/AC link of second level DC/DC current transformer 12; when accumulator electric-quantity reduction and photovoltaic generation deficiency, external electrical network can be passed through DC/AC, HVDC (High Voltage Direct Current) transmission line and second level DC/DC current transformer 12 to energy-storage system 116 chargings equally.Wherein, energy-storage system 116 can adopt storage battery or super capacitor, or the two composite energy storage system that combines.
Below only be preferred implementation of the present invention, protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art the some improvements and modifications not breaking away under the principle of the invention prerequisite should be considered as protection scope of the present invention.
Claims (6)
1. high voltage direct current transmission type grid-connected photovoltaic power generation system, it is characterized in that: comprise more than one photovoltaic DC booster stations (1), HVDC (High Voltage Direct Current) transmission line (2), third level DC/AC current transformer (3), transformer (4) and high-voltage alternating net (5), described photovoltaic DC booster stations (1) link to each other through the input of HVDC (High Voltage Direct Current) transmission line (2) with third level DC/AC current transformer (3), and the output of described third level DC/AC current transformer (3) links to each other with high-voltage alternating net (5) through transformer (4).
2. high voltage direct current transmission type grid-connected photovoltaic power generation system according to claim 1, it is characterized in that: each described photovoltaic DC booster stations (1) comprises second level DC/DC current transformer (12) and two above DC generation unit (11).
3. high voltage direct current transmission type grid-connected photovoltaic power generation system according to claim 2, it is characterized in that: each described DC generation unit (11) comprises plural array (111), plural header box (112), DC power distribution cabinet (113), first order DC/DC current transformer (114), photovoltaic generation unit access switch (115), each described array (111) all links to each other with DC power distribution cabinet (113) by a header box (112), and the output of described DC power distribution cabinet (113) is through first order DC/DC current transformer (114), link to each other with second level DC/DC current transformer (12) behind the photovoltaic generation unit access switch (115).
4. high voltage direct current transmission type grid-connected photovoltaic power generation system according to claim 3 is characterized in that: the energy-storage system (116) that is provided with the Bands cut-through switch on the circuit between described photovoltaic generation unit access switch (115) and the second level DC/DC current transformer (12).
5. the described high voltage direct current transmission type of any one grid-connected photovoltaic power generation system according to claim 1～4 is characterized in that: when described photovoltaic DC booster stations (1) are two when above, plural photovoltaic DC booster stations (1) are shape in parallel.
6. the described high voltage direct current transmission type of any one grid-connected photovoltaic power generation system according to claim 1～4 is characterized in that: be provided with electric capacity (6) on the described HVDC (High Voltage Direct Current) transmission line (2).
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Cited By (7)
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| CN104868498A (en) * | 2015-06-05 | 2015-08-26 | 江苏同芯电气科技有限公司 | Topological structure for wind-solar integrated large-power grid-connected converter system |
| CN107181282A (en) * | 2017-07-25 | 2017-09-19 | 四川宏达石油天然气工程有限公司 | A kind of photovoltaic plant produces the improved efficiency system that disappears |
| CN108462202A (en) * | 2018-02-07 | 2018-08-28 | 国网浙江省电力有限公司 | A kind of more level DCs in new energy base collect system |
| CN109004817A (en) * | 2018-07-09 | 2018-12-14 | 许继集团有限公司 | A kind of the starting method and DC boosting system of DC boosting system |
| CN109462248A (en) * | 2017-09-06 | 2019-03-12 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic energy storage integrated cabinet and its operation method |
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| ES2804248T3 (en) * | 2017-03-07 | 2021-02-05 | Marici Holdings The Netherlands Bv | Photovoltaic Power Plant System |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779900A (en) * | 2014-01-14 | 2015-07-15 | 保利协鑫（苏州）新能源运营管理有限公司 | Photovoltaic grid-connected apparatus |
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| CN107181282A (en) * | 2017-07-25 | 2017-09-19 | 四川宏达石油天然气工程有限公司 | A kind of photovoltaic plant produces the improved efficiency system that disappears |
| CN109462248A (en) * | 2017-09-06 | 2019-03-12 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic energy storage integrated cabinet and its operation method |
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| CN109004817A (en) * | 2018-07-09 | 2018-12-14 | 许继集团有限公司 | A kind of the starting method and DC boosting system of DC boosting system |
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