CN102931679A - Multistage boosting high-power photovoltaic grid-connected power station - Google Patents
Multistage boosting high-power photovoltaic grid-connected power station Download PDFInfo
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- CN102931679A CN102931679A CN2012104087310A CN201210408731A CN102931679A CN 102931679 A CN102931679 A CN 102931679A CN 2012104087310 A CN2012104087310 A CN 2012104087310A CN 201210408731 A CN201210408731 A CN 201210408731A CN 102931679 A CN102931679 A CN 102931679A
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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
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- 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
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Abstract
The invention relates to a multistage booster high-power photovoltaic grid-connected power station, belonging to the technical field of solar energy application. The multistage booster high-power photovoltaic grid-connected power station is composed of battery panel group strings, a primary booster circuit and a concentrated inverse grid-connected device, wherein the primary booster circuit is formed by connecting a plurality of primary booster circuit units provided with maximum power point tracking control circuits, and the concentrated inverse grid-connected device is composed of a grid-connected inverter and a grid-connected booster transformer. The multistage booster high-power photovoltaic grid-connected power station is characterized in that each primary booster circuit unit is composed of chopping booster circuits provided with maximum power point tracking control circuits, and each primary booster circuit unit is in one-to-one correspondence connection with one group of battery panel group string; a secondary booster circuit is also arranged between the primary booster circuit and the concentrated inverse grid-connected device and is formed by connecting a plurality of secondary booster circuit units formed by chopping booster circuits in parallel, and each secondary booster circuit unit is in one-to-one correspondence connection with the primary booster circuit; and the output end of the second booster circuit is connected with the input end of the concentrated inverse grid-connected device. The multistage booster high-power photovoltaic grid-connected power station can ensure that an MW-level, even a GW-level photovoltaic grid-connected power station can be achieved.
Description
Technical field
The present invention relates to the solar photovoltaic grid-connection power station technology.Belong to application of solar.
Background technology
The pv grid-connected plant of present domestic mainstream technology scheme (referring to the 64th page of China Machine Press's " solar photovoltaic grid-connection generating and inversion control thereof "), to form cell plate group string array after the cell panel series connection, be directly connected to the inversion gird connecting device that contains MPPT maximum power point tracking control circuit (MPPT), by grid-connecting apparatus electric energy be defeated by electrical network.Consist of the photovoltaic combining inverter in the grid-connecting apparatus, peak power output 250-1000KW, output voltage 270V-400V, MPPT is generally 450V-820V in the operating voltage range of DC loop, adopt a MPPT that whole cell plate group string array is carried out MPPT maximum power point tracking control, because standby MPPT control circuit of each serial array assignment, this structure can only guarantee that the output of each cell plate group string reaches current total maximum power point, and can not guarantee that each cell plate group string exports the maximum power point separately.Because the electrical characteristic discreteness of each cell plate group string and attenuation characteristic is inconsistent, MPPT can only trace into the power output of the less cell plate group string of energy output, and the generating efficiency of whole pv grid-connected plant is greatly affected.This scheme can't achieve effective control on greater than the photovoltaic combining inverter of 1000KW in power output, and system effectiveness is low, and loss is large.
Existing a kind of parallel networking type photovoltaic power station that adopts multiple branch circuit structure in parallel, (referring to the 65th page of China Machine Press's " solar photovoltaic grid-connection generating and inversion control thereof "), this scheme is series-connected to the DC/DC converter that contains MPPT by cell plate group, then be connected to concentrated inversion gird connecting device after being confluxed by many groups of identical DC/DC converter parallel connections, by grid-connecting apparatus electric energy be defeated by electrical network.We know, the station capacity of this structure is little.When setting up the high-power photovoltaic synchronization power station, need with after several cell plate group connection in series-parallel, be connected to the DC/DC converter, control the some groups of cell plate group strings that are connected in parallel by the MPPT in each DC/DC converter.Its shortcoming is the power stage that can not guarantee each cell plate group string of being connected in parallel at separately maximum power point, and has the problem of power mismatch and many crests; In addition, be subjected to the restriction of cell plate group string insulation voltage and power device operating voltage, cause the expansion of capacity in power station limited.On the other hand, because the electrical characteristic discreteness of its each cell plate group string and attenuation characteristic is inconsistent, MPPT can only trace into the power output of the less cell plate group string of energy output, and the generating efficiency of whole pv grid-connected plant is greatly affected.The direct current transmission voltage of this pv grid-connected plant is up to 850V, and power station internal transmission loss is large.Therefore, the parallel networking type photovoltaic power station of present various structures all can not solve and increase photovoltaic DC-to-AC converter single-machine capacity and the low problem of system's generating efficiency, can not consist of the pv grid-connected plant of MW level even GW level.
Summary of the invention
For overcoming the above-mentioned shortcoming of prior art, the invention provides the multistage high-power photovoltaic synchronization power station of boosting that a kind of generating efficiency is high, the internal transmission loss is low.
The multistage formation of boosting the high-power photovoltaic synchronization power station that realizes the object of the invention comprises the cell plate group string, the first class boost circuit that is composed in parallel by several first class boost circuit units that contain the MPPT maximum power point tracking control circuit and the concentrated inversion gird connecting device that is consisted of by combining inverter and the step-up transformer that is incorporated into the power networks, it is characterized in that described first class boost circuit unit is made of the copped wave booster circuit that contains the MPPT maximum power point tracking control circuit, each first class boost circuit unit and a Battery pack plate group string be corresponding joining one by one, between described first class boost circuit and concentrated inversion gird connecting device, also be provided with a secondary booster circuit, described secondary booster circuit is made of the secondary booster circuit unit parallel connection that the copped wave booster circuit consists of several, described secondary booster circuit unit and first class boost circuit connect one to one, and the output of secondary booster circuit is connected with the input of concentrated inversion gird connecting device.
The operation principle in the multistage high-power photovoltaic synchronization power station of boosting of the present invention is as follows:
Each cell plate group serial connection in this multistage high-power photovoltaic synchronization power station of boosting is subjected to solar energy, after converting direct current to, be passed to the first class boost circuit unit that connects one to one with it, by the MPPT maximum power point tracking control circuit in the first class boost circuit unit, the cell plate group string stably is operated on the maximum power point, finishes the rear parallel connection of once boosting and gather with capacity increasing and booster tension.Carry out secondary through secondary booster circuit unit again and boost, further improve to gather behind the voltage and obtain stable large capacity, high-tension electric energy.Again by concentrated inversion gird connecting device inversion, the backward electric power network power supply of boosting.
The secondary copped wave booster circuit that the present invention increases, should DC voltage-stabilizing control again the maximum power automatic tracking function of cell plate group string being peeled off in traditional first class boost circuit, the energy output of front end how lack no matter, how low of voltage all can provide its work required stable DC input voltage for concentrating inversion gird connecting device after boosting through secondary.Thereby solved present pv grid-connected plant and can not increase photovoltaic DC-to-AC converter single-machine capacity and the low problem of generating efficiency.
Major advantage of the present invention is:
What 1, solved the existing power station of being incorporated into the power networks shares the variety of issue that MPPT brings by many groups batteries in parallel connection plate group string, and the cell plate group string stably is operated on the maximum power point, has greatly improved generating efficiency, even also can generate electricity under low light condition.
2, the secondary copped wave booster circuit by setting up can be realized the required stable DC input voltage of photovoltaic combining inverter work, has improved internal direct streaming system transmission voltage, has increased the electric energy transmitting of single loop dc transmission system; High loss when having reduced the internal system transmission when transmission voltage is low;
3, use prior art can be implemented the dc bus of outlet side easily in the copped wave booster circuit constant voltage control, instructions for use with press polish volt inverter in satisfying, press polish volt inverter can make the photovoltaic DC-to-AC converter conversion efficiency greatly improve in the employing, transmission power loss reducing at double.
The number of shunt circuit that 4, secondary booster circuit unit can be set arbitrarily to be consisting of the secondary booster circuit of different capabilities, thereby can adopt corresponding jumbo inverter to make pv grid-connected plant realize MW level even GW level more.
Below in conjunction with embodiment content of the present invention is described in further details.
Description of drawings
This multistage high-power photovoltaic synchronization Power station structure schematic diagram that boosts of Fig. 1
Embodiment:
Referring to Fig. 1, this multistage formation of boosting the high-power photovoltaic synchronization power station comprises cell plate group string 1, the first class boost circuit A that is composed in parallel by several first class boost circuit units 2 that contain MPPT and the concentrated inversion gird connecting device C that is made of combining inverter 4 and the step-up transformer 5 that is incorporated into the power networks, it is characterized in that described first class boost circuit unit 2 is made of the copped wave booster circuit that contains MPPT, each first class boost circuit unit 2 and a Battery pack plate group string 1 be corresponding joining one by one; Between described first class boost circuit A and concentrated inversion gird connecting device C, also be provided with a secondary booster circuit B, described secondary booster circuit B is made of secondary booster circuit unit 3 parallel connections that the copped wave booster circuit consists of several, and described secondary booster circuit unit 3 connects one to one with first class boost circuit A; The output of secondary booster circuit B is connected with the input of the combining inverter 4 of concentrated inversion gird connecting device C.
In the present embodiment, cell panel is selected 235W universal serial polycrystal silicon cell plate, its output voltage 30.5V.Each cell plate group string 1 is made of 24 cell panel series connection, and each cell plate group string output voltage is 732V, and power output is 5.64KW, and MPPT and copped wave booster circuit can be used prior art and consist of.Each MPPT joins respectively by first class boost circuit unit 2 and a Battery pack plate group string 1, realizes the MPPT maximum power point tracking to each cell plate group string.The input voltage of first class boost circuit unit 2 is 732V, and output voltage boosts to 850V, and power output is 5.64KW.By 9 * 6 such first class boost circuit units, 2 formation first class boost circuit A in parallel, its output voltage is 850V, and power output then is 304.56KW.The input voltage of secondary booster circuit unit 3 is 850V, and output voltage is 1150V, and power output is 304.56KW.The present embodiment has 20 first class boost circuit A, namely by the secondary booster circuit B that consists of after 20 secondary booster circuit unit 3 parallel connections, this moment, the power output of secondary booster circuit B was 20 * 304.56KW=6091.2KW, and output voltage is the dc constant voltage of 1150V.
Concentrate inversion gird connecting device C to be consisted of by press polish volt combining inverter 4 and the step-up transformer 5 that is incorporated into the power networks among the 5MW of high conversion efficiency in the present embodiment.The output voltage of photovoltaic combining inverter 4 is designed to three-phase alternating current 690V, and separate unit power is 5000KW.
From the electric energy of secondary booster circuit B output, be sent to middle press polish volt inverter 4 through the direct current cable that confluxes, its output voltage is the three-phase alternating current of 690V after the inversion, boosting by the step-up transformer 5 that is incorporated into the power networks is the three-phase alternating current of 35KV again, powers to electric power network.
In the present embodiment, separate unit photovoltaic DC-to-AC converter power 250KW-1000KW with existing pv grid-connected plant, output voltage is designed to three-phase alternating current 270V-400V and compares, transmit the electric energy of same capacity, the quantity of photovoltaic combining inverter reduces at double, whole efficiency is higher, transmission capacity is larger, makes pv grid-connected plant can realize the engineering application of MW level even GW level.
Claims (1)
1. the multistage high-power photovoltaic synchronization power station of boosting, comprise the cell plate group string, the first class boost circuit that is composed in parallel by several first class boost circuit units that contain the MPPT maximum power point tracking control circuit and the concentrated inversion gird connecting device that is consisted of by combining inverter and the step-up transformer that is incorporated into the power networks, it is characterized in that described first class boost circuit unit is made of the copped wave booster circuit that contains the MPPT maximum power point tracking control circuit, each first class boost circuit unit and a Battery pack plate group string be corresponding joining one by one, between described first class boost circuit and concentrated inversion gird connecting device, also be provided with a secondary booster circuit, described secondary booster circuit is made of the secondary booster circuit unit parallel connection that the copped wave booster circuit consists of several, described secondary booster circuit unit and first class boost circuit connect one to one, and the output of secondary booster circuit is connected with the input of concentrated inversion gird connecting device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969139A (en) * | 2013-03-20 | 2015-10-07 | 富士电机株式会社 | Solar power generation system |
| CN109995011A (en) * | 2017-12-29 | 2019-07-09 | 冯良桓 | Full direct current buck conveying electric system and method |
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|---|---|---|---|---|
| US20120051095A1 (en) * | 2011-06-29 | 2012-03-01 | Robert Louis Steigerwald | Dc to dc power converters and methods of controlling the same |
| CN102447384A (en) * | 2010-09-30 | 2012-05-09 | 雅达电子国际有限公司 | Converters and inverters for photovoltaic power systems |
| CN202817795U (en) * | 2012-10-12 | 2013-03-20 | 吴加林 | Multistage boosting large-power photovoltaic grid-connected power station |
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- 2012-10-12 CN CN2012104087310A patent/CN102931679A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447384A (en) * | 2010-09-30 | 2012-05-09 | 雅达电子国际有限公司 | Converters and inverters for photovoltaic power systems |
| US20120051095A1 (en) * | 2011-06-29 | 2012-03-01 | Robert Louis Steigerwald | Dc to dc power converters and methods of controlling the same |
| CN202817795U (en) * | 2012-10-12 | 2013-03-20 | 吴加林 | Multistage boosting large-power photovoltaic grid-connected power station |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969139A (en) * | 2013-03-20 | 2015-10-07 | 富士电机株式会社 | Solar power generation system |
| CN104969139B (en) * | 2013-03-20 | 2016-10-05 | 富士电机株式会社 | Solar power system |
| CN109995011A (en) * | 2017-12-29 | 2019-07-09 | 冯良桓 | Full direct current buck conveying electric system and method |
| 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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Application publication date: 20130213 |