CN103326622A - Photovoltaic system suitable for high-voltage direct-current transmission - Google Patents
Photovoltaic system suitable for high-voltage direct-current transmission Download PDFInfo
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- CN103326622A CN103326622A CN2013102449519A CN201310244951A CN103326622A CN 103326622 A CN103326622 A CN 103326622A CN 2013102449519 A CN2013102449519 A CN 2013102449519A CN 201310244951 A CN201310244951 A CN 201310244951A CN 103326622 A CN103326622 A CN 103326622A
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention relates to a photovoltaic system suitable for high-voltage direct-current transmission. Electric energy produced by a photovoltaic array is output through a direct current converting circuit controlled by a tracking controller to serve as the energy source of a power unit, the system controller controls conduction and shutoff of switching elements in power units according to collected related data, the voltage stability of a capacitor is maintained, and a high-voltage and direct current formed by overlaying the voltage of various input power unit capacitors is obtained at the output end. A modularization power unit is adopted, the high-voltage direct current is output through the manner that the power units are mutually overlaid, long distance electricity transmission is carried out, redundancy control can be achieved, and system maintenance is convenient. A control strategy is simple and reliable, floor space is small, and transmission power is large.
Description
Technical field
The present invention relates to a kind of photovoltaic system that is applicable to high voltage direct current transmission.
Background technology
Along with the aggravation of energy environment problem, the utilization of renewable resources such as solar energy more and more obtains paying attention to.It is predicted that to the year two thousand thirty, regenerative resource will account for more than 30% in the total energy structure, and the accounting of solar energy power generating in world's total electricity supply also will reach more than 10%; To the year two thousand forty, regenerative resource will account for more than 50% of total energy consumption, and solar energy power generating will account for more than 20% of total electricity; To 21 century end, regenerative resource will account in energy resource structure more than 80%, and solar power generation will account for more than 60%.These numerals are enough to demonstrate the development prospect of photovoltaic industry and in the energy field important strategic position.China's area is big, it is estimated that solar energy year amount of radiation surpasses 600KJ/cm2, and the solar energy that absorbs of the annual face of land of state is equivalent to 17,000 hundred million tons of standard coals still, so the utilization of solar energy has good prospect.China is vast in territory, populous, the production of electric energy and demand are all bigger, but economically developed zone is extremely unbalanced with generating aboundresources area distribution, the whole nation nearly 2/3 can develop the photovoltaic generation resource distribution in Sichuan, the Northwests such as Yunnan, Tibet, and power consumption account for 2/3 area, the whole nation mainly concentrate on Beijing-Guangzhou Railway along the line to the east of and economically developed area such as the east is coastal, like this, electric energy need transmit 2000～3000km from western power generation energy resource compact district to electrical energy demands center, east.Therefore, satisfy remote, the large capacity transmission demand of thing 2000～3000km, north and south 800～2000km by high voltage direct current transmission, thereby further strengthen the exploitation scale of photovoltaic generation, realize electricity east, west usefulness, during the western and northern cleaning electric energy of producing is transported on a large scale by the high-voltage dc transmission electric network, the area of east power consumption high concentration, satisfy the rapid economic development area to the demand of electric power.
Yet traditional photovoltaic system capacity is little, uses as just distribution power.After the process adjustment of photovoltaic array transmission of electricity electric energy and the inversion, be connected to the grid by grid-connection device.The equipment that needs is many, and floor space is big.So existing photovoltaic system is not suitable for being directly used in high voltage direct current transmission.
Summary of the invention
The purpose of this invention is to provide a kind of photovoltaic system that is applicable to high voltage direct current transmission, be directed to the AC network use in order to solve existing photovoltaic system, can not be directly used in the problem of high voltage direct current transmission.
For achieving the above object, the solution of the present invention is: the photovoltaic system that is applicable to high voltage direct current transmission, comprise that DC side is used for directly connecting the three-phase converter of HVDC (High Voltage Direct Current) transmission line, it exchanges side and is provided with an auxiliary AC system, whenever, be in series by two brachium pontis, each brachium pontis includes at least one photovoltaic power generation apparatus, the output series connection of photovoltaic power generation apparatus; The photovoltaic array that photovoltaic power generation apparatus is joined successively by the output input, DC transfer circuit and power cell constitute, and described power cell is modular switching circuit power cell, and the output of power cell is the output of corresponding photovoltaic power generation apparatus.
All go here and there on every phase brachium pontis and be provided with change of current reactor.
Described power cell comprises a dc capacitor, this dc capacitor and upper and lower two IGBT parallel connections of connecting, each IGBT all is parallel with a backward diode, and the input of power cell connects the described two ends of IGBT down, and the output of power cell connects the two ends of described dc capacitor.
Described photovoltaic system also comprises system controller, the IGBT in described each power cell of system controller difference control connection.
For described DC transfer circuit, connect an input capacitance between its positive and negative two inputs, connect successively between positive input terminal and the positive output end inductance and a rectifier diode, negative input end connects negative output terminal, is connected with a switching tube between inductance and rectifier diode series connection point and the negative input end.
The equal correspondence of each DC transfer circuit is provided with a maximal power tracing controller that is used to switching tube in the DC transfer circuit that triggering signal is provided.
Described auxiliary AC system exchanges with the three-phase converter and also is provided with step-up transformer between the side.
The three-phase converter that described three-phase converter is full bridge structure.
Because existing photovoltaic system is distribution power, capacity is often less, and in order to be incorporated into the power networks, devices needed is also more.Photovoltaic system of the present invention adopts modular construction, each brachium pontis can connect tens even a hundreds of photovoltaic power generation apparatus, the electrical characteristic of the single photovoltaic power generation apparatus of proportional embodiment, effectively promoted converter power, also the DC side busbar voltage is maintained very high electric pressure, make distant-range high voltage direct current transmission be called possibility; Adopt modular power unit, control strategy is simple relatively, also can realize Redundant Control, is convenient to system maintenance, and floor space is little and through-put power is big.It is stable that auxiliary AC system is kept whole converter power output.
Power cell in the photovoltaic power generation apparatus is the calibration power unit, has shortened the manufacturing cycle and provides cost savings.
Auxiliary AC system can directly connect the electrical network of suitable grade or reach suitable electric pressure by step-up transformer.
The DC transfer circuit of each photovoltaic array all is equipped with maximal power tracing controller (MPPT), has reduced to block or be subjected to and has improved efficient according to inhomogeneous influence to its generation.
Description of drawings
Fig. 1 is transmission system topological structure schematic diagram of the present invention;
Fig. 2 is the DC transfer circuit schematic diagram;
Fig. 3 is the power cell structure schematic diagram.
Embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, be applicable to the photovoltaic system of high voltage direct current transmission, comprise that DC side is used for directly connecting the three-phase converter of HVDC (High Voltage Direct Current) transmission line, exchange side and be provided with an auxiliary AC system, whenever, be in series by two brachium pontis, each brachium pontis includes at least one photovoltaic power generation apparatus, the output series connection of photovoltaic power generation apparatus; The photovoltaic array that photovoltaic power generation apparatus is joined successively by the output input, DC transfer circuit and power cell constitute, and power cell is the switching circuit power cell, and the output of power cell is the output of corresponding photovoltaic power generation apparatus.Obviously, the photovoltaic power generation apparatus quantity of each brachium pontis equates.
As a kind of execution mode, power cell can adopt half-bridge structure, as shown in Figure 3, comprise a dc capacitor, this dc capacitor and upper and lower two IGBT parallel connections of connecting, each IGBT all is parallel with a backward diode, and the input of power cell connects the two ends of IGBT down, and the output of power cell connects the two ends of dc capacitor.Photovoltaic system also comprises system controller, the IGBT in each power cell of system controller control connection.System controller is controlled corresponding IGBT shutoff and conducting in the power cell by gathering the related data of returning, and makes capacitor charge and discharge, and it is stable to keep dc capacitor voltage.
As a kind of execution mode, the equal correspondence of each DC transfer circuit is provided with a maximal power tracing controller that is used to switching tube in the DC transfer circuit that triggering signal is provided.MPPT, measuring light photovoltaic array output current and both end voltage thereof, obtain the maximum power point voltage reference value by disturbance observation (Perturb and Observe), the actual photovoltaic array both end voltage that records and this voltage are compared, its difference is through pi regulator, output and the relatively back triggering signal as IGBT in the DC transfer circuit of triangular wave, and then the control photovoltaic array is operated in the maximum power point place.
As other execution modes, all go here and there on every phase brachium pontis and be provided with change of current reactor, be used for further stable maintenance DC bus-bar voltage in the high voltage grade.
As a kind of execution mode, DC transfer circuit can adopt circuit form as shown in Figure 2, connect an input capacitance between its positive and negative two inputs, connect successively between positive input terminal and the positive output end inductance and a rectifier diode, negative input end connects negative output terminal, is connected with a switching tube between inductance and rectifier diode series connection point and the negative input end.
As other execution modes, auxiliary AC system exchanges with the three-phase converter and also is provided with step-up transformer between the side, in order to connect the more electrical network of voltage levels.Because photovoltaic array power output instability reaches suitable electric pressure by step-up transformer and replenishes as it.
As a kind of execution mode, the three-phase converter adopts the three-phase converter of full bridge structure.Converter is three-phase, whenever, comprise that mutually 2N calibration power unit form, be divided into two groups (brachium pontis is one group) up and down, every group power cell number is N, output phase voltage level ladder number is N+1, connects with coupling or uncoupled inductance between two groups of power cells up and down.
Claims (8)
1. be applicable to the photovoltaic system of high voltage direct current transmission, it is characterized in that, comprise that DC side is used for directly connecting the three-phase converter of HVDC (High Voltage Direct Current) transmission line, it exchanges side and is provided with an auxiliary AC system, whenever, be in series by two brachium pontis, each brachium pontis includes at least one photovoltaic power generation apparatus, the output series connection of photovoltaic power generation apparatus; The photovoltaic array that photovoltaic power generation apparatus is joined successively by the output input, DC transfer circuit and power cell constitute, and described power cell is modular switching circuit power cell, and the output of power cell is the output of corresponding photovoltaic power generation apparatus.
2. photovoltaic system according to claim 1 is characterized in that, all goes here and there on every phase brachium pontis and is provided with change of current reactor.
3. photovoltaic system according to claim 1, it is characterized in that, described power cell comprises a dc capacitor, this dc capacitor and upper and lower two IGBT parallel connections of connecting, each IGBT all is parallel with a backward diode, the input of power cell connects the described two ends of IGBT down, and the output of power cell connects the two ends of described dc capacitor.
4. photovoltaic system according to claim 3 is characterized in that, described photovoltaic system also comprises system controller, the IGBT in described each power cell of system controller difference control connection.
5. photovoltaic system according to claim 1, it is characterized in that, for described DC transfer circuit, connect an input capacitance between its positive and negative two inputs, connect successively between positive input terminal and the positive output end inductance and a rectifier diode, negative input end connects negative output terminal, is connected with a switching tube between inductance and rectifier diode series connection point and the negative input end.
6. photovoltaic system according to claim 5 is characterized in that, the equal correspondence of each DC transfer circuit is provided with a maximal power tracing controller that is used to switching tube in the DC transfer circuit that triggering signal is provided.
7. photovoltaic system according to claim 1 is characterized in that, described auxiliary AC system exchanges with the three-phase converter and also is provided with step-up transformer between the side.
8. photovoltaic system according to claim 1 is characterized in that, the three-phase converter that described three-phase converter is full bridge structure.
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| CN2013102449519A CN103326622A (en) | 2013-06-19 | 2013-06-19 | Photovoltaic system suitable for high-voltage direct-current transmission |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656023A (en) * | 2015-08-03 | 2016-06-08 | 许昌开普电气研究院 | Capacitance voltage threshold frequency reduction method applied to modular multilevel converter |
| CN105680686A (en) * | 2015-08-03 | 2016-06-15 | 许昌开普电气研究院 | MMC-based novel topological structure for photovoltaic power generation system |
| CN108429282A (en) * | 2018-03-28 | 2018-08-21 | 阳光电源股份有限公司 | A kind of mesohigh photovoltaic generating system |
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2013
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656023A (en) * | 2015-08-03 | 2016-06-08 | 许昌开普电气研究院 | Capacitance voltage threshold frequency reduction method applied to modular multilevel converter |
| CN105680686A (en) * | 2015-08-03 | 2016-06-15 | 许昌开普电气研究院 | MMC-based novel topological structure for photovoltaic power generation system |
| CN105656023B (en) * | 2015-08-03 | 2018-01-09 | 许昌开普电气研究院 | A kind of capacitance voltage threshold value frequency reducing method applied to modularization multi-level converter |
| CN108429282A (en) * | 2018-03-28 | 2018-08-21 | 阳光电源股份有限公司 | A kind of mesohigh photovoltaic generating system |
| US10938208B2 (en) | 2018-03-28 | 2021-03-02 | Sungrow Power Supply Co., Ltd. | Medium-high voltage photovoltaic power generation system |
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Inventor after: Zhang Qun Inventor after: Wang Baiheng Inventor after: Ma Yicheng Inventor after: Chen Peng Inventor after: Zhao Qian Inventor before: Zhang Qun Inventor before: Wang Baiheng Inventor before: Ma Yicheng Inventor before: Chen Ming Inventor before: Zhao Qian |
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Application publication date: 20130925 |