CN103368200A - Single-ended VSC-HVDC photovoltaic power generation system - Google Patents
Single-ended VSC-HVDC photovoltaic power generation system Download PDFInfo
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- CN103368200A CN103368200A CN2013102543277A CN201310254327A CN103368200A CN 103368200 A CN103368200 A CN 103368200A CN 2013102543277 A CN2013102543277 A CN 2013102543277A CN 201310254327 A CN201310254327 A CN 201310254327A CN 103368200 A CN103368200 A CN 103368200A
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Abstract
The invention discloses a single-ended VSC-HVDC photovoltaic power generation system, which comprises more than one photovoltaic direct current booster station, an HVDC positive cable, an HVDC negative cable, an HVDC converter, a transformer and a high voltage alternating current network, the positive and negative ends of the photovoltaic direct current booster station are respectively connected with the HVDC converter via the HVDC positive cable and the HVDC negative cable, and the output end of the HVDC converter is connected with the high voltage alternating current network via the transformer. The system has the advantages of being simple and compact in structure, low in cost, easy to install and use, high in efficiency, wide in application scope 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 single-ended VSC-HVDC photovoltaic generating 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., cause the large-sized photovoltaic power station to have floor space wide, 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, additionally build the transmission line cost higher.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, single-ended VSC that efficient is high, applied widely-HVDC photovoltaic generating system.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of single-ended VSC-HVDC photovoltaic generating system, comprise more than one photovoltaic DC booster stations, HVDC electrode cable, HVDC negative pole cable, HVDC converter, transformer and High-voltage AC Network, the positive and negative terminal of described photovoltaic DC booster stations links to each other with the HVDC converter through HVDC electrode cable, HVDC negative pole cable respectively, and the output of described HVDC converter links to each other with High-voltage AC Network through transformer.
As a further improvement on the present invention:
Each described photovoltaic DC booster stations is comprised of two above DC generation unit and two above by-pass switches.
The positive pole of first DC generation unit outlet side links to each other with the HVDC electrode cable in each described photovoltaic DC booster stations, the negative pole of last DC generation unit outlet side links to each other with HVDC negative pole cable, links to each other with High-voltage AC Network after transformer boosts by being converted into the alternating current that satisfies the electrical network demand by jumbo HVDC converter behind HVDC transmission line and the DC voltage-stabilizing electric capacity.
Each described DC generation unit comprises more than one array, more than one header box, DC power distribution cabinet and DC/DC high-frequency isolation current transformer, all by linking to each other with DC power distribution cabinet behind the header box, the output of described DC power distribution cabinet links to each other with DC/DC high-frequency isolation current transformer each described array.
When described photovoltaic DC booster stations are two when above, plural photovoltaic DC booster stations are shape in parallel.
Between described HVDC electrode cable and the HVDC negative pole cable electric capacity is set.
Compared with prior art, the invention has the advantages that:
1, single-ended VSC of the present invention-HVDC photovoltaic generating system is simple and compact for structure, with low cost, easy to install, can promote photovoltaic generating system direct voltage grade by the DC/DC link of boosting, and reduces the direct current loss; Adopt underground or seabed HVDC power transmission cable to finish the transmission of high voltage direct current electric energy, need not to build special overhead transmission line.
2, the present invention has realized that by the HVDC current converter high-voltage alternating of photovoltaic generation is incorporated into the power networks, and whole system need not to use the alternating electromotive force potential device, has promoted the system effectiveness of photovoltaic generating system; Adopted the HVDC technology of transmission of electricity, reactive balance, low voltage crossing, harmonic pollution, a plurality of photovoltaic generating system flexibility that can well solve photovoltaic generating system is incorporated into the power networks and the problem of coordinated operation, reduced the difficulty of dispatching of power netwoks, made progress for the online of the Generation Side par in large-sized photovoltaic power station and commercialization and have important practical significance.
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, diode; 111, array; 112, header box; 113, DC power distribution cabinet; 114, DC/DC high-frequency isolation current transformer; 2, HVDC electrode cable; 3, HVDC negative pole cable; 4, electric capacity; 5, HVDC converter; 6, transformer; 7, High-voltage AC Network.
Embodiment
Below with reference to Figure of description and specific embodiment the present invention is described in further details.
As shown in Figure 1, single-ended VSC of the present invention-HVDC photovoltaic generating system, comprise more than one photovoltaic DC booster stations 1, HVDC electrode cable 2, HVDC negative pole cable 3, HVDC converter 5, transformer 6, High-voltage AC Network 7, the positive and negative terminal of photovoltaic DC booster stations 1 links to each other with HVDC converter 5 through HVDC electrode cable 2, HVDC negative pole cable 3 respectively, and the output of HVDC converter 5 links to each other with High-voltage AC Network 7 through transformer 6.When photovoltaic DC booster stations 1 are two when above, plural photovoltaic DC booster stations 1 are shape in parallel.Wherein, HVDC is High Voltage Direct Current Transmission high voltage direct current transmission, and HVDC converter 5 is the voltage source Converter.
In the present embodiment, between HVDC electrode cable 2, the HVDC negative pole cable 3 electric capacity 4 is set.
In the present embodiment, each photovoltaic DC booster stations 1 is comprised of two above DC generation unit 11 and two above by-pass switches.Wherein, each DC generation unit 11 comprises more than one array 111, more than one header box 112, DC power distribution cabinet 113 and DC/DC high-frequency isolation current transformer 114, all by linking to each other with DC power distribution cabinet 113 behind the header box 112, the output of DC power distribution cabinet 113 links to each other with DC/DC high-frequency isolation current transformer 114 each array 111.
The present invention adopts the mode of DC generation unit 11, DC/DC current transformer series connection to improve photovoltaic generation direct voltage grade, with the mode of a plurality of photovoltaic DC booster stations 1 parallel connections to promote the photovoltaic generating system capacity.The positive pole of first DC generation unit 11 outlet sides links to each other with HVDC electrode cable 2 in each photovoltaic DC booster stations 1, the negative pole of N DC generation unit 11 outlet side links to each other with HVDC negative pole cable 3, links to each other with High-voltage AC Network 7 after transformer 6 boosts by being converted into the alternating current that satisfies the electrical network demand by jumbo HVDC converter 5 behind HVDC transmission line and the DC voltage-stabilizing electric capacity.
Among the present invention, DC generation unit 11, DC/DC high-frequency isolation current transformer 114 are finished DC boosting and photovoltaic battery array MPPT following function, different according to the transmission voltage grade of rear end HVDC and DC generation units in series number, DC/DC VD grade is different, simultaneously in order to guarantee the safety of photovoltaic cell component, the DC/DC current transformer 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 DC boosting of each photovoltaic DC generator unit 11 behind the outlet side of DC/DC high-frequency isolation current transformer 114 all with diode 12(by-pass switch) be connected in parallel.When certain DC generation unit breaks down, can directly it be cut out from system, other DC generation unit still can be connected in series by diode, therefore can the work of whole system not impacted.After DC generation cell failure module is repaired, can be directly it be connected in parallel again with corresponding diode, can be to system in the process that accesses yet in the work of other DC generation unit exert an influence.After N DC generation unit 11 series connection, the positive pole of first DC generation unit 11 outlet sides links to each other with HVDC electrode cable 2, the negative pole of N DC generation unit 11 outlet side links to each other with HVDC negative pole cable 3.Electric capacity 4 can guarantee the voltage stabilization of HVDC transmission line, the input of HVDC converter 5 is in parallel with electric capacity 4, to guarantee that HVDC converter 5 operates to voltage source HVDC converter state, HVDC converter 5 can adopt the mode of the straight string data converter of power device or modularization multi-level converter (MMC) that direct current is converted to satisfy 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; HVDC converter 5 can also be realized according to the power scheduling instruction meritorious, the var scheduling feature of photovoltaic plant simultaneously; The three-phase alternating current of HVDC output is connected with High-voltage AC Network 7 by transformer 6, the type selecting of transformer 6 need to consider photovoltaic generating system installed capacity, HVDC converter the output voltage grade and access the comprehensive key element such as power transmission network electric pressure.
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. single-ended VSC-HVDC photovoltaic generating system, it is characterized in that: comprise more than one photovoltaic DC booster stations (1), HVDC electrode cable (2), HVDC negative pole cable (3), HVDC converter (5), transformer (6) and High-voltage AC Network (7), the positive and negative terminal of described photovoltaic DC booster stations (1) links to each other with HVDC converter (5) through HVDC electrode cable (2), HVDC negative pole cable (3) respectively, and the output of described HVDC converter (5) links to each other with High-voltage AC Network (7) through transformer (6).
2. single-ended VSC according to claim 1-HVDC photovoltaic generating system, it is characterized in that: each described photovoltaic DC booster stations (1) is comprised of two above DC generation unit (11) and two above by-pass switches.
3. single-ended VSC according to claim 2-HVDC photovoltaic generating system, it is characterized in that: the positive pole of first DC generation unit (11) outlet side links to each other with HVDC electrode cable (2) in each described photovoltaic DC booster stations (1), the negative pole of last DC generation unit (11) outlet side links to each other with HVDC negative pole cable (3), links to each other with High-voltage AC Network (7) after transformer (6) boosts by being converted into the alternating current that satisfies the electrical network demand by jumbo HVDC converter (5) behind HVDC transmission line and the DC voltage-stabilizing electric capacity.
4. single-ended VSC according to claim 3-HVDC photovoltaic generating system, it is characterized in that: each described DC generation unit (11) comprises more than one array (111), more than one header box (112), DC power distribution cabinet (113) and DC/DC high-frequency isolation current transformer (114), each described array (111) all links to each other with DC power distribution cabinet (113) by behind the header box (112), and the output of described DC power distribution cabinet (113) links to each other with DC/DC high-frequency isolation current transformer (114).
5. the described single-ended VSC of any one-HVDC photovoltaic generating 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 single-ended VSC of any one-HVDC photovoltaic generating system according to claim 1～4 is characterized in that: between described HVDC electrode cable (2) and the HVDC negative pole cable (3) electric capacity (4) is set.
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Cited By (9)
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| CN104113082A (en) * | 2014-07-17 | 2014-10-22 | 西安交通大学 | Modular full direct current photovoltaic system and control method thereof |
| CN105680476A (en) * | 2016-03-09 | 2016-06-15 | 湖南馨雅林工程技术有限公司 | Direct-current boost concentrated inversion photovoltaic power generation system |
| CN105703389A (en) * | 2014-08-25 | 2016-06-22 | 特变电工新疆新能源股份有限公司 | Photovoltaic grid-connected power generation system based on middle and high voltage direct current access |
| CN105703388A (en) * | 2014-08-25 | 2016-06-22 | 特变电工新疆新能源股份有限公司 | Photovoltaic grid-connected power generation system based on middle and high voltage direct current access |
| CN108695881A (en) * | 2017-04-10 | 2018-10-23 | 中国电力科学研究院 | A kind of control method and device of photovoltaic plant direct current grid-connected 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 |
| CN109167390A (en) * | 2018-09-21 | 2019-01-08 | 华为技术有限公司 | A kind of photovoltaic inversion system |
| CN111555322A (en) * | 2020-04-21 | 2020-08-18 | 深圳市禾望电气股份有限公司 | Energy storage system |
| CN109995011B (en) * | 2017-12-29 | 2024-04-16 | 冯良桓 | Full-direct-current step-up-down voltage transmission and power transmission system and method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113082A (en) * | 2014-07-17 | 2014-10-22 | 西安交通大学 | Modular full direct current photovoltaic system and control method thereof |
| CN105703388B (en) * | 2014-08-25 | 2019-06-25 | 特变电工新疆新能源股份有限公司 | A kind of grid-connected photovoltaic system based on the access of mesohigh direct current |
| CN105703389A (en) * | 2014-08-25 | 2016-06-22 | 特变电工新疆新能源股份有限公司 | Photovoltaic grid-connected power generation system based on middle and high voltage direct current access |
| CN105703388A (en) * | 2014-08-25 | 2016-06-22 | 特变电工新疆新能源股份有限公司 | Photovoltaic grid-connected power generation system based on middle and high voltage direct current access |
| CN105703389B (en) * | 2014-08-25 | 2019-06-25 | 特变电工新疆新能源股份有限公司 | A kind of grid-connected photovoltaic system based on the access of mesohigh direct current |
| CN105680476A (en) * | 2016-03-09 | 2016-06-15 | 湖南馨雅林工程技术有限公司 | Direct-current boost concentrated inversion photovoltaic power generation system |
| CN108695881A (en) * | 2017-04-10 | 2018-10-23 | 中国电力科学研究院 | A kind of control method and device of photovoltaic plant direct current grid-connected system |
| CN108695881B (en) * | 2017-04-10 | 2021-10-01 | 中国电力科学研究院 | Control method and device for photovoltaic power station direct current grid-connected system |
| CN109995011B (en) * | 2017-12-29 | 2024-04-16 | 冯良桓 | Full-direct-current step-up-down voltage transmission and power transmission system and method |
| 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 |
| CN109167390A (en) * | 2018-09-21 | 2019-01-08 | 华为技术有限公司 | A kind of photovoltaic inversion system |
| WO2020057635A1 (en) * | 2018-09-21 | 2020-03-26 | 华为技术有限公司 | Photovoltaic power generation inverter system |
| EP3771065A4 (en) * | 2018-09-21 | 2021-03-03 | Huawei Technologies Co., Ltd. | Photovoltaic power generation inverter system |
| CN109167390B (en) * | 2018-09-21 | 2021-11-26 | 华为数字能源技术有限公司 | Photovoltaic power generation inverter system |
| US11217999B2 (en) | 2018-09-21 | 2022-01-04 | Huawei Technologies Co., Ltd. | Photovoltaic power generation inverter system |
| AU2019343425B2 (en) * | 2018-09-21 | 2023-08-24 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic power generation inverter system |
| CN111555322A (en) * | 2020-04-21 | 2020-08-18 | 深圳市禾望电气股份有限公司 | Energy storage system |
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Application publication date: 20131023 |