CN204089685U - A kind of photovoltaic energy storage electricity generation system - Google Patents
A kind of photovoltaic energy storage electricity generation system Download PDFInfo
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- CN204089685U CN204089685U CN201420496852.XU CN201420496852U CN204089685U CN 204089685 U CN204089685 U CN 204089685U CN 201420496852 U CN201420496852 U CN 201420496852U CN 204089685 U CN204089685 U CN 204089685U
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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
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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
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The utility model discloses a kind of photovoltaic energy storage electricity generation system, comprising: photovoltaic module, inverter, DC/DC power module and accumulator plant, described accumulator plant comprises: multiple batteries; Wherein, described accumulator plant is when charging, parallel with one another between any two batteries, described photovoltaic module is each battery charging by described DC/DC power module, and the charging voltage of arbitrary batteries is all less than the minimum output voltage of described photovoltaic module; Described accumulator plant, when discharging, is connected between all batteries mutually; Output voltage after all batteries series connection is not less than the minimum direct current input voltage of described inverter.Described photovoltaic energy storage electricity generation system only need adopt the DC/DC power module only with buck functionality to be that accumulator plant carries out charging, and described photovoltaic energy storage electricity generation system can be made to have higher charge efficiency.
Description
Technical field
The utility model relates to solar energy generation technology field, more particularly, relates to a kind of photovoltaic energy storage electricity generation system.
Background technology
In order to more effectively utilize photovoltaic energy, photovoltaic energy storage electricity generation system is an effective approach.With reference to figure 1, Fig. 1 is the structural representation of a kind of common photovoltaic energy storage electricity generation system in prior art, and described photovoltaic energy storage electricity generation system comprises: photovoltaic module 105, inverter 106, switching device 103, accumulator plant 101 and DC/DC power module 102.Wherein, described switching device 103 comprises: switch S 1 and switch S 2.
When daylight is sufficient, during the rated output power of the electric energy that photovoltaic module 105 sends beyond inverter 106, need the unnecessary electric energy sent by photovoltaic module 105, charged by DC/DC power module 102 accumulators device 101, now switch S 1 and switch S 2 disconnect; When not having illumination night, need switch S 1 and switch S 2 conducting, accumulator plant 101 serves as galvanic current source, and inverter 106 is by the power delivery of the storage of storage battery to electrical network 107, and now DC/DC power module 102 does not work.
But in accumulator plant 101 charging process, if the voltage change range of the input of system 104 is larger, namely when the terminal voltage excursion of photovoltaic module 105 is larger, then need DC/DC power module 102 both to have buck (step-down) function, there is again boost (boosting) function.And DC/DC power module 102 should possess buck function, have again boost function, its charge efficiency can reduce.
Utility model content
For solving the problems of the technologies described above, the utility model provides a kind of photovoltaic energy storage electricity generation system, and described photovoltaic energy storage electricity generation system can adopt the DC/DC power module only with buck functionality to be that accumulator plant is charged, and ensure that charge efficiency.
For achieving the above object, the utility model provides following technical scheme:
A kind of photovoltaic energy storage electricity generation system, this photovoltaic energy storage electricity generation system comprises: photovoltaic module, inverter, DC/DC power module and accumulator plant, and described accumulator plant comprises: multiple batteries;
Wherein, described accumulator plant is when charging, parallel with one another between any two batteries, described photovoltaic module is each battery charging by described DC/DC power module, and the charging voltage of arbitrary batteries is all less than the minimum output voltage of described photovoltaic module; Described accumulator plant, when discharging, is connected between all batteries mutually; Output voltage after all batteries series connection is not less than the minimum direct current input voltage of described inverter.
Preferably, in above-mentioned photovoltaic energy storage electricity generation system, described accumulator plant comprises: the first batteries and the second batteries;
The positive pole of described first batteries is connected with the electrode input end of described inverter by the first switch, and is connected with the positive pole of the second batteries by the 3rd switch; The negative pole of described first batteries is connected with the positive pole of the second batteries by the 5th switch;
The negative pole of described second batteries is connected by the negative input of second switch with described inverter, and is connected with the negative pole of described first batteries by the 4th switch;
The input positive pole of described DC/DC power module is connected with the electrode input end of described inverter, its input negative pole is connected with the negative input of described inverter, its output cathode is connected with the positive pole of described second batteries, and its output negative pole is connected with the negative pole of described first batteries;
Wherein, during described accumulator plant charging, described first switch, described second switch and described 5th switch disconnect, described 3rd switch and described 4th switch conduction; During described accumulator plant electric discharge, described first switch, described second switch and described 5th switch conduction, described 3rd switch and described 4th switch disconnect.
Preferably, in above-mentioned photovoltaic energy storage electricity generation system, described DC/DC power module is buck circuit.
Preferably, in above-mentioned photovoltaic energy storage electricity generation system, also comprise: voltage acquisition apparatus and controller;
Described voltage acquisition apparatus is for obtaining the output voltage of described photovoltaic module;
Described controller is used for the on off state of the first to the 5th switch according to described output voltage control, when needs to the charging of described accumulator plant and described output voltage is more than or equal to described minimum direct current input voltage time, described controller controls described first switch, described second switch and described 5th switch and disconnects, and controls described 3rd switch and described 4th switch conduction; When the described accumulator plant of needs is discharged and described output voltage is less than described minimum direct current input voltage, described controller controls described first switch, described second switch and described 5th switch conduction, and controls described 3rd switch and described 4th switch disconnects.
Preferably, in above-mentioned photovoltaic energy storage electricity generation system, also comprise: voltage acquisition apparatus and voltage display unit;
Wherein, described voltage acquisition apparatus is for obtaining the output voltage of described photovoltaic module; Described voltage display unit is for showing described output voltage.
Preferably, in above-mentioned photovoltaic energy storage electricity generation system, the charging voltage of described multiple batteries is all identical.
Preferably, in above-mentioned photovoltaic energy storage electricity generation system, to any one batteries, this batteries only comprises a cell batteries;
Or this batteries comprises the cell batteries of multiple series connection;
Or this batteries comprises the cell batteries of multiple parallel connection;
Or this batteries comprises the cell batteries of multiple string series-parallel connection.
As can be seen from technique scheme, photovoltaic energy storage electricity generation system provided by the utility model comprises: photovoltaic module, inverter, DC/DC power module and accumulator plant, and described accumulator plant comprises: multiple batteries; Wherein, described accumulator plant is when charging, parallel with one another between any two batteries, described photovoltaic module is each battery charging by described DC/DC power module, and the charging voltage of arbitrary batteries is all less than the minimum output voltage of described photovoltaic module; Described accumulator plant, when discharging, is connected between all batteries mutually; Output voltage after all batteries series connection is not less than the minimum direct current input voltage of described inverter.During described accumulator plant charging, charging voltage due to arbitrary batteries is all less than the minimum output voltage of described photovoltaic module, and it is parallel with one another between any two batteries, therefore, only the DC/DC power module only with buck functionality need be adopted to be that accumulator plant carries out charging, described photovoltaic energy storage electricity generation system can be made to have higher charge efficiency.Described accumulator plant is when discharging, owing to mutually connecting between all batteries, described accumulator plant can be made like this to have higher output voltage, by arranging the number of batteries, making the output voltage after series connection be not less than the minimum direct current input voltage of described inverter, is namely that power supply grid is powered by inverter.
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 a kind of photovoltaic energy storage power generation system structure schematic diagram common in prior art;
A kind of photovoltaic energy storage power generation system structure schematic diagram that Fig. 2 provides for the embodiment of the present application;
The circuit diagram of the buck circuit of a kind of DC/DC power module that Fig. 3 provides for the embodiment of the present application.
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.
Along with the continuous lifting of output power of photovoltaic module, when fluctuation occurs in illumination, the fluctuation of the output voltage of photovoltaic module can be caused increasing.Like this, in order to ensure the stability when accumulator plant 101 of the electricity generation system of photovoltaic energy storage shown in Fig. 1 is charged, just needing DC/DC power module 102 should possess buck function, there is again boost function.But, the built-up circuit of DC/DC power module 102 can be made so comparatively complicated, and then cause cost higher, and also can reduce charge efficiency.
For solving the problem, the embodiment of the present application provides a kind of photovoltaic energy storage electricity generation system, comprising: photovoltaic module, inverter, DC/DC power module and accumulator plant, and described accumulator plant comprises: multiple batteries; Wherein, described accumulator plant is when charging, parallel with one another between any two batteries, described photovoltaic module is each battery charging by described DC/DC power module, and the charging voltage of arbitrary batteries is all less than the minimum output voltage of described photovoltaic module; Described accumulator plant, when discharging, is connected between all batteries mutually; Output voltage after all batteries series connection is not less than the minimum direct current input voltage of described inverter.
During described accumulator plant charging, charging voltage due to arbitrary batteries is all less than the minimum output voltage of described photovoltaic module, and it is parallel with one another between any two batteries, therefore, only the DC/DC power module only with buck functionality need be adopted to be that accumulator plant carries out charging, described photovoltaic energy storage electricity generation system can be made to have higher charge efficiency.Described accumulator plant is when discharging, owing to mutually connecting between all batteries, described accumulator plant can be made like this to have higher output voltage, by arranging the number of batteries, namely the minimum direct current input voltage making the output voltage after series connection be not less than described inverter is that power supply grid is powered by inverter.
When described accumulator plant comprises the first batteries and second batteries two batteries, described photovoltaic energy storage power generation system structure as shown in Figure 2, a kind of photovoltaic energy storage power generation system structure schematic diagram that Fig. 2 provides for the embodiment of the present application, comprising: accumulator plant, DC/DC power module 205, switching device 201, switching device 203, switching device 206, DC port 104, photovoltaic module 105, inverter 106.Wherein, accumulator plant is made up of the first batteries 202, second batteries 204; Switching device 201 is made up of the first switch S 1 and second switch S2; Switching device 203 is made up of the 5th switch S 5; Switching device 206 is made up of the 3rd switch S 3 and the 4th switch S 4; Direct-flow input end mouth 207 comprises direct current I/O positive pole P and direct current I/O negative pole N.
The positive pole of described first batteries 202 is connected with the electrode input end of described inverter 106 by the first switch S 1, and is connected with the positive pole of the second batteries 204 by the 3rd switch S 3; The negative pole of described first batteries 202 is connected with the positive pole of the second batteries 204 by the 5th switch S 5;
The negative pole of described second batteries 204 is connected with the negative input of described inverter 106 by second switch S2, and is connected with the negative pole of described first batteries 202 by the 4th switch S 4;
The input positive pole of described DC/DC power module 205 is connected with the electrode input end of described inverter 106, its input negative pole is connected with the negative input of described inverter 106, its output cathode is connected with the positive pole of described second batteries 204, and its output negative pole is connected with the negative pole of described first batteries 202;
Wherein, during described accumulator plant charging, described first switch S 1, described second switch S2 and described 5th switch S 5 disconnect (described switching device 201 and switching device 203 all disconnect), described 3rd switch S 3 and described 4th switch S 4 conducting (conducting of described switching device 206), make two batteries parallel with one another, the quick charge that the DC/DC power module 205 only with buck functionality can realize accumulator plant can be adopted like this.During described accumulator plant electric discharge, described first switch S 1, described second switch S2 and described 5th switch S 5 conducting (described switching device 201 and switching device 203 all conductings), described 3rd switch S 3 disconnects (described switching device 206 disconnects) with described 4th switch S 4, to make two batteries parallel with one another, to improve the output voltage of described accumulator plant.
Described direct current I/O positive pole P is arranged between described inverter 106 electrode input end and described first switch S 1, and is arranged on the input positive pole of described inverter 106 electrode input end and described DC/DC power module 205.Described direct current I/O negative pole N is arranged between described inverter 106 negative input and described second switch S2, and between the input negative pole being arranged on described inverter 106 negative input and described DC/DC power module 205.
The annexation of described photovoltaic module 105, inverter 106 and electrical network 107 is same as the prior art.The positive pole of photovoltaic module 105 connects the electrode input end of inverter, and the negative pole of photovoltaic module 105 connects the negative input of inverter 106.Three-phase output end S, T, R of photovoltaic DC-to-AC converter are connected with the three-phase circuit of electrical network 107 respectively.
When illumination is sufficient, when the electric energy that photovoltaic module 105 cannot send by inverter 106 is delivered to electrical network 107 completely, switching device 201,203 remains open, and switching device 206 keeps conducting, and batteries 202,204 forms parallel connection.System is charged by DC/DC module 205 accumulators group 202,204.At this moment, the output charging voltage of the DC/DC module 205 of needs is lower.When the voltage range that DC port 207 connects photovoltaic module 105 changes greatly, system still can pass through reduction voltage circuit, and namely DC/DC module 205 accumulators group 202,204 is charged.
When illumination is not enough, when photovoltaic module 105 does not have Energy transmission or fan-out capability very little, switching device 201,203 keeps conducting, and switch 206 remains open.At this moment batteries 202,204 forms series connection, and make batteries 202,204 series connection output voltage meet the workable minimum direct voltage requirement of inverter 106, the power delivery that batteries 202,204 stores by inverter 106 is to electrical network 107.
With reference to figure 3, described DC/DC power module 205 is buck circuit, and described buck circuit comprises: switching tube M, diode D, inductance L and electric capacity C.The output of described switching tube M is connected by first pole plate of described inductance L with described electric capacity C; The negative pole of described diode D is connected with the output of described switching tube M, and its positive pole is connected with second pole plate of described electric capacity C.Wherein, the input of described switching tube M is the input positive pole of described DC/DC power module 205; The common node of described first pole plate and described inductance L is the output cathode of described DC/DC power module 205; The positive pole of described diode D and the common node of described second pole plate are input negative pole and the output negative pole of described DC/DC power module 205.
The control of the on off state of described switching device 201,203 and 206 can pass through automatic control realization, and now, described photovoltaic energy storage electricity generation system also comprises: voltage acquisition apparatus and controller; Described voltage acquisition apparatus is for obtaining the output voltage of described photovoltaic module.Described controller is used for the on off state of the first to the 5th switch according to described output voltage control, when needs to the charging of described accumulator plant and described output voltage is more than or equal to described minimum direct current input voltage time, described controller controls described first switch, described second switch and described 5th switch and disconnects, and controls described 3rd switch and described 4th switch conduction; When the described accumulator plant of needs is discharged and described output voltage is less than described minimum direct current input voltage, described controller controls described first switch, described second switch and described 5th switch conduction, and controls described 3rd switch and described 4th switch disconnects.
When the on off state Non-follow control of described switching device 201,203 and 206 realizes, described photovoltaic energy storage electricity generation system also comprises: voltage acquisition apparatus and voltage display unit.Wherein, described voltage acquisition apparatus is for obtaining the output voltage of described photovoltaic module; Described voltage display unit is for showing described output voltage.According to the on off state of described output voltage manual control switch device 201,203 and 206.
In order to when ensureing to charge, the charging of each batteries is stablized, the charging voltage arranging multiple batteries is all identical.
In the present embodiment, to any one batteries, this batteries only comprises a cell batteries; Or this batteries comprises the cell batteries of multiple series connection; Or this batteries comprises the cell batteries of multiple parallel connection; Or this batteries comprises the cell batteries of multiple string series-parallel connection.
Known by foregoing description, the application reduces the design difficulty of DC/DC power module 205 by connection in series-parallel state when changing charge in batteries and electric discharge, thus expands the range of application of photovoltaic energy storage electricity generation system, improves the charge efficiency of system.
It should be noted that, above-described embodiment only lists the implementation of two batteries, in a particular application, the number of described batteries can for the integer being more than or equal to arbitrarily 2, as long as make all batteries in parallel when charging, the series connection when discharging, and input and output voltage is unanimously.
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 energy storage electricity generation system, this photovoltaic energy storage electricity generation system comprises: photovoltaic module, inverter, DC/DC power module and accumulator plant, is characterized in that, described accumulator plant comprises: multiple batteries;
Wherein, described accumulator plant is when charging, parallel with one another between any two batteries, described photovoltaic module is each battery charging by described DC/DC power module, and the charging voltage of arbitrary batteries is all less than the minimum output voltage of described photovoltaic module; Described accumulator plant, when discharging, is connected between all batteries mutually; Output voltage after all batteries series connection is not less than the minimum direct current input voltage of described inverter.
2. photovoltaic energy storage electricity generation system according to claim 1, is characterized in that, described accumulator plant comprises: the first batteries and the second batteries;
The positive pole of described first batteries is connected with the electrode input end of described inverter by the first switch, and is connected with the positive pole of the second batteries by the 3rd switch; The negative pole of described first batteries is connected with the positive pole of the second batteries by the 5th switch;
The negative pole of described second batteries is connected by the negative input of second switch with described inverter, and is connected with the negative pole of described first batteries by the 4th switch;
The input positive pole of described DC/DC power module is connected with the electrode input end of described inverter, its input negative pole is connected with the negative input of described inverter, its output cathode is connected with the positive pole of described second batteries, and its output negative pole is connected with the negative pole of described first batteries;
Wherein, during described accumulator plant charging, described first switch, described second switch and described 5th switch disconnect, described 3rd switch and described 4th switch conduction; During described accumulator plant electric discharge, described first switch, described second switch and described 5th switch conduction, described 3rd switch and described 4th switch disconnect.
3. photovoltaic energy storage electricity generation system according to claim 2, is characterized in that, described DC/DC power module is buck circuit.
4. photovoltaic energy storage electricity generation system according to claim 2, is characterized in that, also comprise: voltage acquisition apparatus and controller;
Described voltage acquisition apparatus is for obtaining the output voltage of described photovoltaic module;
Described controller is used for the on off state of the first to the 5th switch according to described output voltage control, when needs to the charging of described accumulator plant and described output voltage is more than or equal to described minimum direct current input voltage time, described controller controls described first switch, described second switch and described 5th switch and disconnects, and controls described 3rd switch and described 4th switch conduction; When the described accumulator plant of needs is discharged and described output voltage is less than described minimum direct current input voltage, described controller controls described first switch, described second switch and described 5th switch conduction, and controls described 3rd switch and described 4th switch disconnects.
5. photovoltaic energy storage electricity generation system according to claim 2, is characterized in that, also comprise: voltage acquisition apparatus and voltage display unit;
Wherein, described voltage acquisition apparatus is for obtaining the output voltage of described photovoltaic module; Described voltage display unit is for showing described output voltage.
6. photovoltaic energy storage electricity generation system according to claim 1, is characterized in that, the charging voltage of described multiple batteries is all identical.
7. photovoltaic energy storage electricity generation system according to claim 4, is characterized in that, to any one batteries, this batteries only comprises a cell batteries;
Or this batteries comprises the cell batteries of multiple series connection;
Or this batteries comprises the cell batteries of multiple parallel connection;
Or this batteries comprises the cell batteries of multiple string series-parallel connection.
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| CN201420496852.XU CN204089685U (en) | 2014-08-29 | 2014-08-29 | A kind of photovoltaic energy storage electricity generation system |
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| CN201420496852.XU CN204089685U (en) | 2014-08-29 | 2014-08-29 | A kind of photovoltaic energy storage electricity generation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021129808A1 (en) * | 2019-12-25 | 2021-07-01 | 中兴通讯股份有限公司 | Solar power supply system, control method and control device for solar power supply system, electronic device, and computer-readable storage medium |
| CN113690939A (en) * | 2021-09-17 | 2021-11-23 | 阳光电源股份有限公司 | Light storage all-in-one machine and control method thereof |
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2014
- 2014-08-29 CN CN201420496852.XU patent/CN204089685U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021129808A1 (en) * | 2019-12-25 | 2021-07-01 | 中兴通讯股份有限公司 | Solar power supply system, control method and control device for solar power supply system, electronic device, and computer-readable storage medium |
| CN113690939A (en) * | 2021-09-17 | 2021-11-23 | 阳光电源股份有限公司 | Light storage all-in-one machine and control method thereof |
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