CN204089686U - A kind of photovoltaic inversion energy-storage system - Google Patents
A kind of photovoltaic inversion energy-storage system Download PDFInfo
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- CN204089686U CN204089686U CN201420502241.1U CN201420502241U CN204089686U CN 204089686 U CN204089686 U CN 204089686U CN 201420502241 U CN201420502241 U CN 201420502241U CN 204089686 U CN204089686 U CN 204089686U
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- 238000010248 power generation Methods 0.000 claims abstract description 24
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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
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
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Abstract
This application provides a kind of photovoltaic inversion energy-storage system, this system comprise at least one photovoltaic inversion branch road and with this photovoltaic inversion branch road energy storage branch road one to one, by arranging first switching device between the first direct current conflux case in each photovoltaic inversion branch road and photovoltaic DC-to-AC converter, be energized or power-off to photovoltaic DC-to-AC converter to control the first photovoltaic cell component in this photovoltaic inversion branch road, and utilize a second switch device to connect an energy storage branch road at this photovoltaic DC-to-AC converter input, wherein, each energy storage branch road includes an energy-storage battery be connected with this second switch device and the photovoltaic power generation apparatus be connected with this energy-storage battery, thus make this energy storage branch road and photovoltaic inversion branch road relatively independent, avoid the frequent switching of energy-storage battery charging and discharging state in this energy storage branch road, meanwhile, adding of energy storage branch road, photovoltaic DC-to-AC converter also can powered to load without under light conditions, improve the equivalent utilance of inverter.
Description
Technical field
The utility model relates generally to technical field of photovoltaic power generation, relates to a kind of photovoltaic inversion energy-storage system more specifically.
Background technology
In current photovoltaic generating system, when having illumination by day, photovoltaic DC-to-AC converter can generate electricity by way of merging two or more grid systems or provide electric energy, with the need for electricity of satisfied local load from net to local load; But when unglazed photograph at night, this photovoltaic DC-to-AC converter will quit work because of noenergy input, thus cannot meet the need for electricity of local load.In order to solve this problem, present stage normally increases energy storage device on the basis of this photovoltaic generating system, thus forms photovoltaic inversion energy-storage system, to extend the operating time of photovoltaic DC-to-AC converter, improves photovoltaic generation benefit.
Concrete, the DC-DC converter that the energy storage device increased comprises energy-storage battery and is connected with this energy-storage battery, and this DC-DC converter is connected with photovoltaic DC-to-AC converter input, in actual applications, the unnecessary solar energy that photovoltaic battery panel produces will by after the conversion of this DC-DC converter, be stored in this energy-storage battery, namely give energy-storage battery charging process; When supplying power for photovoltaic cell is not enough, this energy-storage battery will be discharged by this DC-DC converter, to meet the need for electricity of electrical network or local load.
But, find after deliberation, for existing photovoltaic inversion energy-storage system, cause short-time rating to rise sharply in the situations such as rapid drawdown in reasons such as sudden load change or photovoltaic battery panel shades, energy-storage battery will carry out discharge and recharge switching continually, has had a strong impact on the energy-storage battery life-span.
Utility model content
In view of this, the utility model provides a kind of photovoltaic inversion energy-storage system, avoids the frequent switching to energy-storage battery charging and discharging state, thus improves the useful life of energy-storage battery.
To achieve these goals, this application provides following technical scheme:
A kind of photovoltaic inversion energy-storage system, described system comprises: at least one photovoltaic inversion branch road and with described photovoltaic inversion branch road energy storage branch road one to one, wherein:
Described in each, photovoltaic inversion branch road includes:
First photovoltaic cell component, the first direct current conflux case be connected with described first photovoltaic cell component output, the first switching device that one end is connected with described first direct current conflux case output, and the photovoltaic DC-to-AC converter that input is connected with the described first switching device other end;
Described in each, energy storage branch road includes:
The second switch device that one end and the described energy storage branch road photovoltaic DC-to-AC converter input one to one in photovoltaic inversion branch road is connected, the energy-storage battery that output is connected with the other end of described second switch device, the photovoltaic power generation apparatus be connected with the input of described energy-storage battery.
Preferably, described photovoltaic power generation apparatus comprises: at least one the photovoltaic generation branch road be connected with described energy-storage battery input respectively, and wherein, described in each, photovoltaic generation branch road comprises:
Second photovoltaic cell component;
One end is connected with described first photovoltaic cell component output, the DC-DC converter that the other end is connected with described energy-storage battery input.
Preferably, described photovoltaic generation branch road also comprises:
Second direct current conflux case, then the output of described second photovoltaic cell component is connected with the input of described DC-DC converter by described second direct current conflux case;
And one end is connected with the output of described second direct current conflux case, the 3rd switching device that the other end is connected with the photovoltaic DC-to-AC converter input in photovoltaic inversion branch road one to one.
Preferably, described first photovoltaic cell component and described second photovoltaic cell component include at least one photovoltaic cell string, and photovoltaic cell string described in each includes multiple photovoltaic battery panel.
Preferably, described first switching device, described second switch device and described 3rd switching device are specially D.C. contactor.
Preferably, described system also comprises:
Be connected with all D.C. contactors, control the controller of the shutoff of described D.C. contactor or conducting.
Preferably, described system also comprises:
The first indicator light be connected one by one with at least one photovoltaic inversion branch road described;
And, the second indicator light be connected one by one with described energy storage branch road.As can be seen here, compared with prior art, this application provides a kind of photovoltaic inversion energy-storage system, this system comprise at least one photovoltaic inversion branch road and with this photovoltaic inversion branch road energy storage branch road one to one, by arranging first switching device between the first direct current conflux case in each photovoltaic inversion branch road and photovoltaic DC-to-AC converter, be energized or power-off to photovoltaic DC-to-AC converter to control the first photovoltaic cell component in this photovoltaic inversion branch road, and utilize a second switch device to connect an energy storage branch road at this photovoltaic DC-to-AC converter input, wherein, each energy storage branch road includes an energy-storage battery be connected with this second switch device and the photovoltaic power generation apparatus be connected with this energy-storage battery, thus make this energy storage branch road and photovoltaic inversion branch road relatively independent, avoid the frequent switching of energy-storage battery charging and discharging state in this energy storage branch road.
In actual applications, when illumination is sufficient, controls the first switching device and close, powered by this photovoltaic inversion branch road, ensure that photovoltaic DC-to-AC converter normally works, the photovoltaic power generation apparatus simultaneously in corresponding energy storage branch road can be the charging of connected energy-storage battery; When unglazed photograph or illumination deficiency, control the first switching device and open, second switch device closes, and is discharged by the energy-storage battery in energy storage branch road, to ensure that photovoltaic DC-to-AC converter normally works.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structured flowchart of a kind of photovoltaic generating system of prior art;
Fig. 2 is the structural representation of a kind of photovoltaic inversion energy storage of prior art;
Fig. 3 is the structured flowchart of a kind of photovoltaic inversion energy-storage system of the utility model embodiment;
Fig. 4 (a) is the structural representation of the utility model another kind of photovoltaic inversion energy-storage system embodiment;
Fig. 4 (b) is the structural representation of the another kind of embodiment of the another kind of photovoltaic inversion energy-storage system of the utility model;
Fig. 5 is the structural representation of another photovoltaic inversion energy-storage system embodiment of the utility model;
Fig. 6 (a) is the structural representation of a kind of embodiment of another photovoltaic inversion energy-storage system of the utility model;
Fig. 6 (b) is the structural representation of the another kind of embodiment of another photovoltaic inversion energy-storage system of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The structured flowchart of photovoltaic generating system as shown in Figure 1, this photovoltaic generating system generally includes: photovoltaic cell component 101, the direct current conflux case 102 be connected with this photovoltaic cell component 101 output, and the photovoltaic DC-to-AC converter 103 to be connected with this direct current conflux case 102 output, this photovoltaic DC-to-AC converter 103 output can be connected with electrical network or directly be connected with local load.When illumination is sufficient, the solar energy that photovoltaic cell component produces sends to photovoltaic DC-to-AC converter through direct current conflux case, to meet inversion demand; And when illumination is not enough, the solar energy that photovoltaic cell component produces cannot meet the demand of inversion to electric energy, thus have impact on the normal operation of photovoltaic generating system.
In order to solve this problem, prior art is by increasing by an energy storage device at photovoltaic DC-to-AC converter, the structured flowchart of existing photovoltaic inversion energy-storage system as shown in Figure 2, when the sunny solar energy making photovoltaic cell component produce is too much, by unnecessary solar energy by being stored in energy-storage battery 202 after the step-down process of DC-DC converter 201, namely energy-storage battery 202 can be charged; And when illumination is not enough or do not have illumination, energy-storage battery 202 will be in discharge condition, after the electric energy that namely energy-storage battery exports passes through the boosting process of DC-DC converter 201, send to photovoltaic DC-to-AC converter, to meet the minimum voltage needed for inversion, thus ensure the normal work of photovoltaic DC-to-AC converter.
Known based on above-mentioned analysis, in existing photovoltaic inversion energy storage device, the whether sufficient energy storage device of illumination is all connected with photovoltaic generating system, thus, when there is the problems such as shade in the photovoltaic battery panel in sudden load change or photovoltaic cell component, the frequent switching of energy-storage battery charging and discharging state will be caused, thus have a strong impact on the useful life of this energy-storage battery.
In order to avoid the frequent switching of energy-storage battery charging and discharging state, the utility model provides a kind of photovoltaic inversion energy-storage system, this system comprise at least one photovoltaic inversion branch road and with this photovoltaic inversion branch road energy storage branch road one to one, by arranging first switching device between the first direct current conflux case in each photovoltaic inversion branch road and photovoltaic DC-to-AC converter, be energized or power-off to photovoltaic DC-to-AC converter to control the first photovoltaic cell component in this photovoltaic inversion branch road, and utilize a second switch device to connect an energy storage branch road at this photovoltaic DC-to-AC converter input, wherein, each energy storage branch road includes an energy-storage battery be connected with this second switch device and the photovoltaic power generation apparatus be connected with this energy-storage battery, thus make this energy storage branch road and photovoltaic inversion branch road relatively independent, avoid the frequent switching of energy-storage battery charging and discharging state in this energy storage branch road.
And in actual applications, when illumination is sufficient, controls the first switching device and close, powered by this photovoltaic inversion branch road, ensure that photovoltaic DC-to-AC converter normally works, the photovoltaic power generation apparatus simultaneously in corresponding energy storage branch road can be the charging of connected energy-storage battery; When unglazed photograph or illumination deficiency, control the first switching device and open, second switch device closes, and is discharged by the energy-storage battery in energy storage branch road, to ensure that photovoltaic DC-to-AC converter normally works.
Embodiment one:
As shown in Figure 3, for the structured flowchart of a kind of photovoltaic inversion energy-storage system of the utility model embodiment, this system can comprise: at least one photovoltaic inversion branch road 310 and with this photovoltaic inversion branch road 310 energy storage branch road 320 one to one, the present embodiment Fig. 3 is only described for the energy storage branch road 320 of a photovoltaic inversion branch road 310 and correspondence thereof, wherein:
Each photovoltaic inversion branch road 310 all can comprise:
First photovoltaic cell component 311, the first direct current conflux case 312 be connected with this first photovoltaic cell component 311 output, the first switching device 313 that one end is connected with this first direct current conflux case 312 output, and the photovoltaic DC-to-AC converter 314 that input is connected with first switching device 313 other end, in actual applications, photovoltaic DC-to-AC converter 314 output in all photovoltaic inversion branch roads is all connected with electrical network and/or local load.
And each energy storage branch road 320 can include:
The second switch device 321 that one end and this energy storage branch road photovoltaic DC-to-AC converter 314 input one to one in photovoltaic inversion branch road 310 is connected, the energy-storage battery 322 that output is connected with the other end of this second switch device 321, and the photovoltaic power generation apparatus 323 be connected with the input of this energy-storage battery 322.
In the practical application of the present embodiment, when having illumination by day, control the first switching device 313 to close, second switch device 321 disconnects, then powered for electrical network or local load by this photovoltaic inversion branch road 310, meanwhile, the energy storage branch road 320 corresponding with this photovoltaic inversion branch road 310 also can normally work, and is namely charged for energy-storage battery 322 by the photovoltaic power generation apparatus 323 in this energy storage branch road 320.And when unglazed photograph at night, control the first switching device 313 to disconnect, second switch device 321 closes, thus energy-storage battery 322 is connected with photovoltaic DC-to-AC converter 314 input and DC side, then this energy-storage battery 322 will be powered for electrical network or local load by second switch device 321, photovoltaic DC-to-AC converter 314, thus make photovoltaic DC-to-AC converter tidal time difference at night on daytime, improve the equivalent generated output of photovoltaic DC-to-AC converter, ensure that the reliably working of electrical network and local load.
Wherein, in the photovoltaic inversion branch road course of work, because energy storage branch road and this photovoltaic inversion branch road are separate, energy storage branch road can participate in work during difference, namely the first switching device closes and the disconnection of second switch device, thus, there is the situations such as shade in the photovoltaic battery panel that the utility model embodiment avoids because of local sudden load change or this photovoltaic inversion branch road, and cause photovoltaic inversion branch road generated output to be not enough to provide local load, thus cause the technical problem of the frequent switching of energy-storage battery charging and discharging state, improve the useful life of energy-storage battery.
It should be noted that, if when making photovoltaic inversion branch road generated output be not enough to provide local load in illumination deficiency, in order to ensure that photovoltaic DC-to-AC converter normally works, the utility model runs the first switching device and second switch device closes simultaneously, to make photovoltaic inversion branch road and energy storage branch road simultaneously for photovoltaic DC-to-AC converter is powered.Wherein, in order to reduce being coupled of photovoltaic cell component in photovoltaic inversion branch road and energy-storage battery, time and frequency that the first switching device and second switch device open simultaneously should be reduced as far as possible.
In addition, in grid-connected system, the Dead Time of the first switching device and the switching of second switch device can be accepted, thus, when generating electricity by way of merging two or more grid systems, in order to avoid being coupled of photovoltaic cell component and energy-storage battery, can arrange the first switching device different with second switch device time open-minded, namely synchronization only allows a switching device open-minded.
In addition, for the photovoltaic inversion energy-storage system with many photovoltaic inversion branch circuit parallel connection, the energy storage branch road of its each parallel connection can independence networking in turn, for other photovoltaic inverter grid-connecteds.
Preferably, the photovoltaic cell component in the present embodiment can comprise at least one photovoltaic cell string, and each photovoltaic cell string all can comprise multiple photovoltaic battery panel, and this multiple photovoltaic battery panel can be connected in series, and also can be connected in parallel; In like manner, when photovoltaic cell component comprises multiple photovoltaic cell string, the connection of this multiple photovoltaic cell string can be serial or parallel connection, and the application does not do concrete restriction to this.
Wherein, first switching device and second switch device can be all D.C. contactor, in practical application, can control its conducting or shutoff by controller, the control of this controller to D.C. contactor belongs to this area routine techniques means, and the utility model is not described in detail in this.
Certainly, this first switching device and second switch device can also be common switches, now, this photovoltaic inversion energy-storage system can also comprise: when photovoltaic inversion branch road generated output is not enough to provide local load, the warning device of output alarm information, as buzzer, indicator light or voice module etc., to make user change the first switching device and second switch device current state in time, thus ensure the need for electricity of local load.
As another embodiment of the utility model, this photovoltaic inversion energy-storage system can also comprise: the first indicator light be connected with each photovoltaic inversion branch road, and the second indicator light to be connected with each energy storage branch road, in actual applications, user intuitively can obtain according to the flicker of the first indicator light and the second indicator light that current what power for photovoltaic DC-to-AC converter is which photovoltaic inversion branch road or which energy storage branch road.
Passable based on above-mentioned analysis, the utility model utilize the first switching device and second switch device make photovoltaic inversion branch road and energy storage branch road separate, thus avoid the switching that takes place frequently causing energy-storage battery charging and discharging state in the photovoltaic inversion branch road course of work because of problems such as the shades of local sudden load change or photovoltaic battery panel, and then avoid the impact on energy-storage battery useful life; And, because the power supply of the discharge and recharge of energy-storage battery and the photovoltaic cell component of photovoltaic inversion branch road is separate, thus, improve the flexibility of energy-storage battery capacity configuration, namely make the photovoltaic power generation apparatus flexible structure in energy storage branch road changeable, thus improve systems generate electricity efficiency; Further, the present embodiment utilizes the energy storage branch road increased to achieve photovoltaic DC-to-AC converter uninterrupted power supply at night on daytime, improves the equivalent generated output of photovoltaic DC-to-AC converter.
In order to the structure of the photovoltaic inversion energy-storage system that clearer explanation the utility model provides, the utility model divides following a few class to be described in detail to its structure, refers to the content that following embodiment two ~ embodiment four describes.
Embodiment two:
As shown in Fig. 4 (a) He (b), for the structural representation of a kind of photovoltaic inversion energy-storage system of the utility model embodiment, the present embodiment is described a photovoltaic inverter grid-connected, then the photovoltaic inversion energy-storage system of the present embodiment can comprise: photovoltaic inversion branch road 410 and the energy storage branch road 420 be connected with this photovoltaic inversion branch road 410, wherein:
This photovoltaic inversion branch road 410 can comprise: the first photovoltaic cell component 411, the first direct current conflux case 412 be connected with this first photovoltaic cell component 411 output, the first switching device K1 that one end is connected with this first direct current conflux case 412 output, and the photovoltaic DC-to-AC converter 413 that input is connected with this first switching device K1 other end.
In actual applications, the output of this photovoltaic DC-to-AC converter 413 can directly be connected with electrical network or local load.
This energy storage branch road 420 can comprise: the second switch device K2 that one end is connected with photovoltaic DC-to-AC converter 413 input (i.e. DC side) in photovoltaic inversion branch road 410, the energy-storage battery 421 that output is connected with the other end of this second switch device K2, the photovoltaic power generation apparatus be connected with the input of energy-storage battery 421, this photovoltaic power generation apparatus comprises at least one photovoltaic generation branch road, as Fig. 4 (a) for photovoltaic power generation apparatus comprises the system configuration schematic diagram of a photovoltaic generation branch road, the system configuration schematic diagram of Fig. 4 (b) multiple photovoltaic generation branch road for photovoltaic power generation apparatus comprises.
Wherein, each photovoltaic generation branch road all can comprise: the second photovoltaic cell component 422, one end is connected with this first photovoltaic cell component 422 output, the DC-DC converter 423 that the other end is connected with energy-storage battery 421 input, in the application, this DC-DC converter 423 is mainly used in the transformation process of the output voltage to the second photovoltaic cell component 422, to realize the charging to energy-storage battery 421.
Preferably, the first switching device K1 in the present embodiment and second switch device K2 is specifically as follows D.C. contactor, controls the break-make of this D.C. contactor by controller; Certainly, the first switching device K1 and second switch device K2 can be also common switch, controls its closed and disconnected according to actual needs by staff.
Wherein, the on-off logic of this first switching device K1 and second switch device K2 only can allow a switching device to close for synchronization, thus ensure that the complete independence between photovoltaic inversion branch road and corresponding energy storage branch road, make the control of whole photovoltaic inversion energy-storage system simple.
But, for from net electric power system, because local load in the Dead Time that the first switching device K1 and second switch device K2 switch can of short duration power down, thus, in order to avoid local load power down, being applied to the first switching device K1 in the photovoltaic inversion energy-storage system of this system and second switch device K2 allows simultaneously open-minded, powers to make photovoltaic inversion branch road and energy storage branch road for local load simultaneously.It should be noted that, in order to reduce being coupled of the first photovoltaic cell component and energy storage branch road, time and frequency that the first switching device K1 and second switch device K2 opens should be reduced as far as possible simultaneously.
In addition, for grid-connected system, because it accepts the Dead Time of the first switching device K1 and second switch device K2 switching, thus, within the system, synchronization can only allow the first switching device K1 or second switch device K2 open-minded, thus make photovoltaic inversion branch road and energy storage branch road completely independent.
In the present embodiment, when energy storage branch road 420 comprises multiple photovoltaic generation branch road, the device only comprised a photovoltaic generation branch road carries out mark and illustrates, as shown in Fig. 4 (b), all photovoltaic generation branch road outputs are in parallel, and are connected with energy-storage battery.When having illumination by day, the second photovoltaic cell component 422 in each photovoltaic generation branch road can be charged to energy-storage battery by corresponding DC-DC converter 423.
Preferably, above-mentioned first photovoltaic cell component 411 and the second photovoltaic cell component 422 all can comprise at least one photovoltaic cell string, and each photovoltaic cell string includes multiple photovoltaic battery panel, this multiple photovoltaic battery panel can be connected in series, and also can be connected in parallel; In like manner, when photovoltaic cell component comprises multiple photovoltaic cell string, the connection of this multiple photovoltaic cell string can be serial or parallel connection, and the application does not do concrete restriction to this.
In the practical application of the present embodiment, when having illumination by day, closed first switching device K1, disconnect second switch device K2, powered to electrical network or local load by photovoltaic inversion branch road 410, this energy storage branch road 420 also can work simultaneously, and the second photovoltaic module 422 namely in photovoltaic power generation apparatus will be charged to energy-storage battery 421 by corresponding DC-DC converter 423; When unglazed photograph at night, disconnect the first switching device K1, and closed second switch device K2, thus the DC side of photovoltaic DC-to-AC converter 413 is communicated with energy-storage battery 421 output, then this energy-storage battery 421 will be powered to electrical network or local load by second switch device K2, photovoltaic DC-to-AC converter 413.
As can be seen here, the present embodiment utilizes separate photovoltaic inversion branch road and energy storage branch road to achieve the uninterrupted power supply at photovoltaic DC-to-AC converter night on daytime, thus improves the equivalent generated output of photovoltaic DC-to-AC converter.And, in the practical application of the present embodiment, due to photovoltaic inversion branch road 410 for electrical network or local load power time, energy storage branch road 420 also has neither part nor lot in work, namely when the first switching device K1 is in closure state, second switch device K2 is in off-state, thus, when there is the problems such as shade and cause short-time rating (i.e. amount of power supply and the power consumption) situations such as rapid drawdown that rise sharply in the photovoltaic battery panel in local sudden load change or the first photovoltaic cell component, energy-storage battery in energy storage branch road can't be had an impact, thus the frequent switching avoiding the charging and discharging state of energy-storage battery is on the impact in its useful life.
Embodiment three:
As shown in Figure 5, for the structural representation of the utility model another kind of photovoltaic inversion energy-storage system embodiment, the present embodiment is described multiple photovoltaic inverter grid-connected, then the photovoltaic inversion energy-storage system of the present embodiment can comprise: multiple photovoltaic inversion branch road 510 and the energy storage branch road 520 connected one to one with this photovoltaic inversion branch road 510, wherein:
Each photovoltaic inversion branch road 510 all can comprise: the first photovoltaic cell component 511, the first direct current conflux case 512 be connected with this first photovoltaic cell component 511 output, the first switching device K1 that one end is connected with this first direct current conflux case 512 output, and the photovoltaic DC-to-AC converter 513 that input is connected with this first switching device K1 other end.
Each energy storage branch road 520 all can comprise: the second switch device K2 that one end connects with photovoltaic DC-to-AC converter 513 input (i.e. DC side) in corresponding photovoltaic inversion branch road 510, the energy-storage battery 521 that output is connected with the other end of this second switch device K2, the DC-DC converter 522 that one end is connected with the input of energy-storage battery 521, and the second photovoltaic cell component 523 be connected with the other end of this DC-DC converter 522.
Preferably, the first switching device K1 in the present embodiment and second switch device K2 is specifically as follows D.C. contactor, and its control logic can refer to the description of embodiment two corresponding part, and this enforcement is not described in detail in this.
In addition, above-mentioned first photovoltaic cell component 511 and the second photovoltaic cell component 523 all can comprise at least one photovoltaic cell string, and each photovoltaic cell string includes multiple photovoltaic battery panel, this multiple photovoltaic battery panel can be connected in series, and also can be connected in parallel; In like manner, when photovoltaic cell component comprises multiple photovoltaic cell string, the connection of this multiple photovoltaic cell string can be serial or parallel connection, and the application does not do concrete restriction to this.
As shown in Figure 5, be described for two photovoltaic inverter grid-connecteds, conveniently two photovoltaic inversion branch roads and two energy storage branch roads are described, numbering can be added in each device back, as the first photovoltaic cell component 1 in a photovoltaic inversion branch road, photovoltaic DC-to-AC converter 1, the first photovoltaic cell component 1 ＇ in another photovoltaic inversion branch road, photovoltaic DC-to-AC converter 1 ＇ etc., illustrates no longer one by one at this.
In actual applications, each energy storage branch road can independence networking in turn, for other photovoltaic inverter grid-connecteds, as shown in Figure 5, in certain moment, disconnect the first switching device K1, closed second switch device K2, then photovoltaic DC-to-AC converter 1 carries out V/F control independence networking by second switch device K2 and energy-storage battery B1, and the photovoltaic inversion branch road at photovoltaic DC-to-AC converter 1 ＇ place will be grid-connected by P/Q control model, meanwhile, the DC-DC converter 522 in two energy storage branch roads is that corresponding energy-storage battery B1 or B1 ＇ charges.
Wherein, when energy-storage battery B1 state-of-charge is lower, carries out V/F by energy-storage battery B1 ＇, second switch device K2 ＇ and photovoltaic DC-to-AC converter 1 ＇ and control independence networking, and photovoltaic DC-to-AC converter 1 to carry out P/Q control model grid-connected.As can be seen here, in the photovoltaic inversion energy-storage system of many photovoltaic DC-to-AC converters parallel connection, always have the power path of independence networking, complete line voltage and support, to realize the demand of multiple photovoltaic DC-to-AC converter parallel connection.
And, no matter this photovoltaic inversion energy-storage system comprises how many photovoltaic inversion branch roads and energy storage branch road, the work of photovoltaic inversion branch road and energy storage branch road is all separate, not only achieve the uninterrupted power supply at photovoltaic DC-to-AC converter night on daytime, improve the equivalent generated output of photovoltaic DC-to-AC converter, and the frequent switching avoiding the charging and discharging state of energy-storage battery is on the impact in its useful life.
Embodiment four:
As shown in Fig. 6 (a) He (b), for the structural representation of another photovoltaic inversion energy-storage system embodiment of the utility model, the present embodiment is described for a photovoltaic inverter grid-connected, then this system can comprise: photovoltaic inversion branch road 610 and the energy storage branch road 620 (not marking in figure) be connected with this photovoltaic inversion branch road 610, wherein:
This photovoltaic inversion branch road 610 can comprise:
First photovoltaic cell component 611, the first direct current conflux case 612 be connected with this first photovoltaic cell component 611 output, the first switching device K1 that one end is connected with this first direct current conflux case 612 output, and the photovoltaic DC-to-AC converter 613 that input is connected with this first switching device K1 other end.
This energy storage branch road 620 can comprise:
The second switch device K2 that one end is connected with photovoltaic DC-to-AC converter 613 input (i.e. DC side) in photovoltaic inversion branch road 610, the energy-storage battery 621 that output is connected with the other end of this second switch device K2, the photovoltaic power generation apparatus be connected with the input of energy-storage battery 621, this photovoltaic power generation apparatus comprises at least one photovoltaic generation branch road, as Fig. 6 (a) for photovoltaic power generation apparatus comprises the system configuration schematic diagram of a photovoltaic generation branch road, the system configuration schematic diagram of Fig. 6 (b) multiple photovoltaic generation branch road for photovoltaic power generation apparatus comprises.
Wherein, each luminous branch road all can comprise: the second photovoltaic cell component 622, second direct current conflux case 623 and the DC-DC converter 624 connected successively, and one end is connected with the output of this second direct current conflux case 623, the 3rd switching device K3 that the other end is connected with photovoltaic DC-to-AC converter 613 input in photovoltaic inversion branch road 610 one to one, in the present embodiment, the output of this DC-DC charger 624 is connected with energy-storage battery 621 input.
Preferably, the first switching device K1 in the present embodiment, second switch device K2 and the 3rd switching device K3 is specifically as follows D.C. contactor, the break-make of this D.C. contactor is controlled by controller, wherein, the on-off logic of the first switching device K1 and second switch device K2 can see the description of above-described embodiment two corresponding part, the present embodiment is no longer repeated at this, and the on-off logic of the first switching device K1 and the 3rd switching device K3 is synchronization permission conducting simultaneously, certainly, also one of them conducting can be controlled according to actual light conditions, the on-off logic of second switch device K2 and the 3rd switching device K3 can refer to the on-off logic of the first switching device K1 and the second switch device K2 described in above-described embodiment two, no longer repeat herein.
In addition, above-mentioned first photovoltaic cell component 611 and the second photovoltaic cell component 622 all can comprise at least one photovoltaic cell string, and each photovoltaic cell string includes multiple photovoltaic battery panel, this multiple photovoltaic battery panel can be connected in series, and also can be connected in parallel; In like manner, when photovoltaic cell component comprises multiple photovoltaic cell string, the connection of this multiple photovoltaic cell string can be serial or parallel connection, and the application does not do concrete restriction to this.
With the structural representation of Fig. 6 (a) in order to be described, the present embodiment is by increase the 3rd switching device K3, when illumination deficiency by day, the first switching device K1 and the 3rd switching device K3 can be closed simultaneously, second switch device K2 is in off-state, thus powered for photovoltaic DC-to-AC converter 613 by the first photovoltaic cell component 611 and the second photovoltaic cell component 622 simultaneously, compared with the structural representation shown in Fig. 4 (a), embodiment adds the Power supply of photovoltaic DC-to-AC converter, reduce energy conversion link, thus improve system effectiveness.
Meanwhile, this first photovoltaic cell component 611 and the second photovoltaic cell component 622 constitute small light with energy-storage battery and store up real-time electric power system, concrete, when the photovoltaic power generation quantity of the first photovoltaic cell component 611 and the second photovoltaic cell component 622 is greater than load, energy-storage battery 621 will absorb unnecessary photovoltaic energy, even if energy-storage battery 621 is in charged state; And when photovoltaic power generation quantity is less than load, energy-storage battery 621 will send power to meet the normal demand of load, even if energy-storage battery 621 is in discharge condition, thus achieve " peak load shifting " to photovoltaic battery panel institute energy output, the reliability service of the system of guarantee.
And when illumination abundance by day, the present embodiment can only close the first switching device K1, is local load or mains supply by photovoltaic inversion branch road; When unglazed photograph at night, only closed second switch device K2 is that local load is powered by the energy-storage battery in this energy storage branch road.
As can be seen here, the present embodiment achieves the uninterrupted power supply of photovoltaic DC-to-AC converter, improve the equivalent generated output of photovoltaic DC-to-AC converter, and, because photovoltaic inversion branch road and energy storage branch road can work alone, when avoiding the work of photovoltaic inversion branch road, make the frequent switching of energy-storage battery charging and discharging state because of the shade of local sudden load change or photovoltaic battery panel, thus the impact in useful life on energy-storage battery.
It should be noted that, for the photovoltaic inversion energy-storage system structure of the many photovoltaic generations branch circuit parallel connection shown in the present embodiment Fig. 6 (b), its operation principle and the photovoltaic inversion energy-storage system similar with a photovoltaic generation branch circuit parallel connection shown in beneficial effect and Fig. 6 (a), the utility model is not described in detail in this.
In addition, about in the various embodiments described above, the such as relational terms of first, second grade and so on is only used for an entity and another entity to make a distinction, and not necessarily requires or imply the relation or order that there is any this reality between these entities.
In this specification, each embodiment adopts and to go forward one by one or mode arranged side by side describes, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a photovoltaic inversion energy-storage system, is characterized in that, described system comprises: at least one photovoltaic inversion branch road and with described photovoltaic inversion branch road energy storage branch road one to one, wherein:
Described in each, photovoltaic inversion branch road includes:
First photovoltaic cell component, the first direct current conflux case be connected with described first photovoltaic cell component output, the first switching device that one end is connected with described first direct current conflux case output, and the photovoltaic DC-to-AC converter that input is connected with the described first switching device other end;
Described in each, energy storage branch road includes:
The second switch device that one end and the described energy storage branch road photovoltaic DC-to-AC converter input one to one in photovoltaic inversion branch road is connected, the energy-storage battery that output is connected with the other end of described second switch device, the photovoltaic power generation apparatus be connected with the input of described energy-storage battery.
2. system according to claim 1, is characterized in that, described photovoltaic power generation apparatus comprises: at least one the photovoltaic generation branch road be connected with described energy-storage battery input respectively, and wherein, described in each, photovoltaic generation branch road comprises:
Second photovoltaic cell component;
One end is connected with described first photovoltaic cell component output, the DC-DC converter that the other end is connected with described energy-storage battery input.
3. system according to claim 2, is characterized in that, described photovoltaic generation branch road also comprises:
Second direct current conflux case, then the output of described second photovoltaic cell component is connected with the input of described DC-DC converter by described second direct current conflux case;
And one end is connected with the output of described second direct current conflux case, the 3rd switching device that the other end is connected with the photovoltaic DC-to-AC converter input in photovoltaic inversion branch road one to one.
4. the system according to Claims 2 or 3, is characterized in that, described first photovoltaic cell component and described second photovoltaic cell component include at least one photovoltaic cell string, and photovoltaic cell string described in each includes multiple photovoltaic battery panel.
5. system according to claim 3, is characterized in that, described first switching device, described second switch device and described 3rd switching device are specially D.C. contactor.
6. system according to claim 5, is characterized in that, described system also comprises:
Be connected with all D.C. contactors, control the controller of the shutoff of described D.C. contactor or conducting.
7. the system according to any one of claim 1-3, is characterized in that, described system also comprises:
The first indicator light be connected one by one with at least one photovoltaic inversion branch road described;
And, the second indicator light be connected one by one with described energy storage branch road.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104967139A (en) * | 2015-07-29 | 2015-10-07 | 阳光电源股份有限公司 | Photovoltaic power generation device |
| CN107947209A (en) * | 2017-11-13 | 2018-04-20 | 李鑫 | A kind of light stores up integrated electric power supply control system |
| WO2019149118A1 (en) * | 2018-02-05 | 2019-08-08 | 华为技术有限公司 | Photovoltaic power generation system and photovoltaic power transmission method |
| CN110519887A (en) * | 2019-09-02 | 2019-11-29 | 东莞市金速能科技有限公司 | The quick storage power saving apparatus of street lamp |
| CN111492553A (en) * | 2017-10-27 | 2020-08-04 | Lt照明（台湾）有限公司 | Photovoltaic power plant |
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2014
- 2014-09-02 CN CN201420502241.1U patent/CN204089686U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967139A (en) * | 2015-07-29 | 2015-10-07 | 阳光电源股份有限公司 | Photovoltaic power generation device |
| CN111492553A (en) * | 2017-10-27 | 2020-08-04 | Lt照明（台湾）有限公司 | Photovoltaic power plant |
| CN107947209A (en) * | 2017-11-13 | 2018-04-20 | 李鑫 | A kind of light stores up integrated electric power supply control system |
| WO2019149118A1 (en) * | 2018-02-05 | 2019-08-08 | 华为技术有限公司 | Photovoltaic power generation system and photovoltaic power transmission method |
| EP3742572A4 (en) * | 2018-02-05 | 2021-03-24 | Huawei Technologies Co., Ltd. | Photovoltaic power generation system and photovoltaic power transmission method |
| US11539212B2 (en) | 2018-02-05 | 2022-12-27 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic power generation system and photovoltaic power transmission method |
| EP4243235A3 (en) * | 2018-02-05 | 2023-11-22 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic power generation system and photovoltaic power transmission method |
| CN110519887A (en) * | 2019-09-02 | 2019-11-29 | 东莞市金速能科技有限公司 | The quick storage power saving apparatus of street lamp |
| CN110519887B (en) * | 2019-09-02 | 2021-11-12 | 东莞市金速能科技有限公司 | Quick electricity storage and saving system for street lamp |
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