CN104836513A - Solar battery intermittent output method - Google Patents
Solar battery intermittent output method Download PDFInfo
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- CN104836513A CN104836513A CN201510185190.3A CN201510185190A CN104836513A CN 104836513 A CN104836513 A CN 104836513A CN 201510185190 A CN201510185190 A CN 201510185190A CN 104836513 A CN104836513 A CN 104836513A
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- energy storage
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- solar panel
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- 238000000034 method Methods 0.000 title abstract description 5
- 238000004146 energy storage Methods 0.000 claims abstract description 97
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000019771 cognition Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
-
- 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
-
- 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 invention provides a solar battery intermittent output method. The method comprises a step of providing a solar battery panel, and determining working voltage corresponding to the largest power point of the solar battery panel according to the working temperature of the solar battery panel; a step of providing an energy storage device, wherein an output end of the solar battery panel is connected with an input end of the energy storage device, and setting an upper voltage threshold and a lower voltage threshold according to the working voltage corresponding to the largest power point of the solar battery panel, wherein the working voltage corresponding to the largest power point of the solar battery panel is between the upper voltage threshold and the lower voltage threshold; and a step of providing a rear control device and a load, wherein an output end of the energy storage device is connected with the load and the rear control device is arranged between the energy storage device and the load, determining the relation among voltage of the energy storage device, the upper voltage threshold and the lower voltage threshold, and further determining connection and disconnection between the energy storage device and the load.
Description
Technical field
The present invention relates to a kind of output intent, particularly the intermittent output intent of a kind of solar cell.
Background technology
Power output and the sunlight strength of solar cell are closely related, and its current-voltage characteristic is nonlinear.Such as a solar module is directly connected with a DC load, the supply-demand relationship of electric energy is not often mated, load cisco unity malfunction when supply falls short of demand, waste electric energy when drug on the market, solar cell and load most of the time are not in optimum Working.
Due to sunrise sunset and weather effect, the instability that solar cell exports is internal, therefore, most solar power generation is combined with electrical network or traditional chemical battery, by the buffer capacity of electrical network or traditional chemical battery, make solar cell can play best effect, also meet the normal requirement that normal load is supplied power supply simultaneously.
But, due to the intervention of electrical network or traditional chemical battery, make solar power system become complicated, cost.Be current the most general, way that cost is minimum by electrical network, but sunny place is not have electrical network everywhere, on the such as water surface, in farmland, the combining inverter that solar cell is connected with electrical network is also extra cost; Higher by traditional chemical battery cost, the problem such as capacity, life-span of chemical cell is more outstanding, and this method user is fewer and feweri.
Due to the particularity of the output nonlinear impedance of solar module, in order to obtain maximum power output, common practices connects complicated special electronic circuit at the output of solar module, change the impedance of this electronic circuit continuously, observe the current/voltage exporting change trend of solar module, being analyzed, judge and adjust, being often in vicinity in the hope of allowing the power output of solar module as much as possible.This is the main flow way that traditional solar maximum power point is followed the tracks of.The tracking of this maximum power point has the limitation of working range, generally can optimize tracking effect under strong sunlight operating mode, and despise the follow-up control under weak sunlight.
But, voltage corresponding to the power output maximum of solar module is a known parameter substantially, although the working temperature of this parameter and solar module and solar radiation intensity have certain relation, this relation is also simple and extensively cognition; This parameter and incident sunlight strength relationship less, larger with the working temperature relation of solar module.If so there is a kind of method to allow the output voltage clamper of solar module near maximum power point voltage known in advance, the output of solar module just can be in optimum state naturally.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the intermittent output intent of a kind of new solar cell.
The intermittent output intent of a kind of solar cell, comprising: provide solar panel, determines the operating voltage corresponding to its maximum power point according to the working temperature of described solar panel;
Energy storage device is provided, the output of described solar panel is connected with the input of described energy storage device, operating voltage corresponding to described solar panel maximum power point sets voltage upper threshold value and the voltage lower threshold value of described energy storage device, and the operating voltage corresponding to wherein said solar panel maximum power point is between the voltage upper threshold value and voltage lower threshold value of described energy storage device;
Rearmounted control device and load are provided, the output of described energy storage device is connected with described load, described rearmounted control device is located between described energy storage device and described load, judges the voltage of described energy storage device and the relation between the voltage upper threshold value of its setting and voltage lower threshold value;
If the voltage of described energy storage device is higher than described voltage upper threshold value, then described rearmounted control device closes, described energy storage device and described load are in conducting state, if the voltage of described energy storage device is lower than described voltage lower threshold value, then described rearmounted control device disconnects, and described energy storage device and described load are in off-state.
As the further improvement of above-mentioned execution mode, preposition control device is provided, described preposition control device is located between described solar panel and described energy storage device, when the voltage of described energy storage device is higher than described voltage upper threshold value, described preposition control device disconnects, described solar panel and described energy storage device are in off-state, when the voltage of described energy storage device is lower than described voltage upper threshold value, described preposition control device closes, and described solar panel and described energy storage device are in conducting state.
As the further improvement of above-mentioned execution mode, described solar panel comprises temperature sensor and controller, described temperature sensor is responded to the working temperature of described solar panel in real time and is fed back to described controller, and described controller determines the operating voltage corresponding to its maximum power point according to the working temperature of described solar panel.
As the further improvement of above-mentioned execution mode, the operating voltage corresponding to described solar panel maximum power point sets voltage upper threshold value and the voltage lower threshold value that the voltage upper threshold value of described energy storage device and voltage lower threshold value comprise the dynamically described energy storage device of adjustment setting.
As the further improvement of above-mentioned execution mode, the voltage lower threshold value of described energy storage device setting and voltage upper threshold value are in the normal operating voltage range of described load.
As the further improvement of above-mentioned execution mode, described load is direct current machine or inverter.
As the further improvement of above-mentioned execution mode, described energy storage device is super capacitor.
Compared to prior art, the intermittent output intent of solar cell provided by the invention is simple, cost is low, conducting between energy storage device and load and disconnection is controlled by rearmounted control device, to sacrifice the certainty of the operating time of described load to ensure the maximization of the generating efficiency of solar panel, can solar energy be effectively utilized, and efficiently solve the resistance matching problem of solar panel and load, make the output of solar panel be in optimum state.The occasion that the intermittent output intent of solar cell provided by the invention is particularly suitable for solar cell widgets, heavy load, service time do not explicitly call for, as fields such as solar energy pumping irrigations from far-off regions, or the occasion of sunlight conditions difference.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings, wherein:
Fig. 1 is the structural representation of the output circuit realizing the intermittent output intent of solar cell of the present invention.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope that the present invention protects.
Referring to Fig. 1, is the structural representation of the output circuit realizing the intermittent output intent of solar cell of the present invention.The output circuit 100 of the intermittent output intent of described solar cell comprises solar panel 1, preposition control device 2, energy storage device 3, rearmounted control device 4 and load 5.
The output of described solar panel 1 is connected with the input of described energy storage device 3.Described preposition control device 2 is located between described solar panel 1 and described energy storage device 3, for controlling conducting between described solar panel 1 and described energy storage device 3 and disconnection.The output of described energy storage device 3 is connected with described load 5.Described rearmounted control device 4 is located between described energy storage device 3 and described load 5, for controlling conducting between described energy storage device 3 and described load 5 and disconnection.
Preferably, described energy storage device 3 is super capacitor, and it has good life-span and fan-out capability.
Preferably, described load 5 is direct current machine or inverter.
The intermittent output intent of solar cell provided by the invention comprises step:
Step S1, provides solar panel, determines the operating voltage corresponding to its maximum power point according to the working temperature of described solar panel;
Step S2, energy storage device is provided, the output of described solar panel is connected with the input of described energy storage device, operating voltage corresponding to described solar panel maximum power point sets voltage upper threshold value and the voltage lower threshold value of described energy storage device, and the operating voltage corresponding to wherein said solar panel maximum power point is between the voltage upper threshold value and voltage lower threshold value of described energy storage device;
In this step, described solar panel absorbs solar energy, and solar energy is converted to electrical power storage in described energy storage device.
Step S3, rearmounted control device and load are provided, the output of described energy storage device is connected with described load, and described rearmounted control device is located between described energy storage device and described load, judges the voltage of described energy storage device and the relation between the voltage upper threshold value of its setting and voltage lower threshold value;
Step S4, if the voltage of described energy storage device is higher than described voltage upper threshold value, then described rearmounted control device closes, described energy storage device and described load are in conducting state, if the voltage of described energy storage device is lower than described voltage lower threshold value, then described rearmounted control device disconnects, and described energy storage device and described load are in off-state.
In this step, electric current needed for described load is enough large, the electric current flowing to described load from described energy storage device is greater than the electric current that described solar panel flows to described energy storage device, and the voltage synchronous of described solar panel and described energy storage device declines; When the voltage drop of described energy storage device is to during lower than described voltage lower threshold value, described rearmounted control device disconnects, described energy storage device and described load are in off-state, described energy storage device stops providing electric energy for described load, described load quits work, and the electric current of described solar panel continues to flow to described energy storage device, the voltage of described energy storage device rises gradually, rejudge the voltage of described energy storage device and the relation between the voltage upper threshold value of its setting and voltage lower threshold value, enter next circulation.In order to ensure the normal work of described load, voltage lower threshold value and the voltage upper threshold value of described energy storage device setting must in the normal operating voltage ranges of described load.
As the further improvement of above-mentioned execution mode, the intermittent output intent of described solar cell also comprises provides preposition control device, described preposition control device is located between described solar panel and described energy storage device, when the voltage of described energy storage device is higher than protection voltage, described preposition control device disconnects, and described solar panel and described energy storage device are in off-state; When the voltage of described energy storage device is lower than recovery voltage, described preposition control device closes, and described solar panel and described energy storage device are in conducting state.Be subject to artificial disturbance when rearmounted control device or break down; or load is subject to artificial disturbance or breaks down to such an extent as to be less than from the electric current that described energy storage device flows to described load the electric current that described solar module flows to described energy storage device; described solar panel and the voltage of described energy storage device fail synchronous decline; when rising further on the contrary, the safety and stablization that this preposition control device allows described solar panel and described energy storage device be in off-state to contribute to protecting energy storage device and whole system.Described protection voltage is determined by the characteristic of energy storage device, and described recovery voltage is determined by system.
As the further improvement of above-mentioned execution mode, described rearmounted control device disconnects, when described energy storage device and described load are in off-state, the voltage of described energy storage device fails to rise gradually by expection, when declining on the contrary, can judge that sunlight resource is too weak, the output of solar module is not enough to described energy storage device, described energy storage device is reverse on the contrary when powering to solar module, and described preposition control device disconnects, and avoids energy waste.
As the further improvement of above-mentioned execution mode, described preposition control device comprises a diode and two switches, and described two switches are respectively switch one and switch two, and the two is connected in series, and described diode is in parallel with described switch two.By the improvement of described preposition control device, this task can be completed better, reduce energy loss.
Operating voltage corresponding to described solar panel maximum power point mainly changes with variation of ambient temperature, ambient temperature residing for described solar panel is the working temperature of solar panel, therefore, in order to effectively utilize solar energy, can dynamically adjust according to the working temperature of described solar panel the voltage upper threshold value and voltage lower threshold value that set described energy storage device.Particularly, described solar panel comprises temperature sensor and controller, described temperature sensor is responded to the working temperature of described solar panel in real time and is fed back to described controller, described controller determines the operating voltage corresponding to its maximum power point according to the working temperature of described solar panel, and then dynamically adjustment sets voltage upper threshold value and the voltage lower threshold value of described energy storage device.Certainly, in order to improve the job stability of described load, might not the working temperature one of described solar panel change, namely the operating voltage corresponding to described solar panel maximum power point, once the adjustment setting voltage upper threshold value of described energy storage device and the voltage lower threshold value of changing, the variable quantity of operating voltage corresponding to described solar panel maximum power point can exceed certain limit and adjusts the voltage upper threshold value and voltage lower threshold value that set described energy storage device again.
Compared to prior art, the intermittent output intent of solar cell provided by the invention is simple, cost is low, conducting between energy storage device and load and disconnection is controlled by rearmounted control device, to sacrifice the certainty of the operating time of described load to ensure the maximization of the generating efficiency of solar panel, can solar energy be effectively utilized, and efficiently solve the resistance matching problem of solar panel and load, make the output of solar panel be in optimum state.The occasion that the intermittent output intent of solar cell provided by the invention is particularly suitable for solar cell widgets, heavy load, service time do not explicitly call for, as fields such as solar energy pumping irrigations from far-off regions.In addition, also can be used as the effect that the raising of inverter under weak sunlight exports, be combined with mainstream technology; Or the importation of alternative main flow inverter, reduces the input tracer request of inverter, simplifies the direct current operating mode of inverter.
Above-described is only embodiments of the present invention, it should be pointed out that for the person of ordinary skill of the art at this, without departing from the concept of the premise of the invention, can also make improvement, but these all belongs to protection scope of the present invention.
Claims (7)
1. the intermittent output intent of solar cell, is characterized in that, comprising:
Solar panel is provided, determines the operating voltage corresponding to its maximum power point according to the working temperature of described solar panel;
Energy storage device is provided, the output of described solar panel is connected with the input of described energy storage device, operating voltage corresponding to described solar panel maximum power point sets voltage upper threshold value and the voltage lower threshold value of described energy storage device, and the operating voltage corresponding to wherein said solar panel maximum power point is between the voltage upper threshold value and voltage lower threshold value of described energy storage device;
Rearmounted control device and load are provided, the output of described energy storage device is connected with described load, described rearmounted control device is located between described energy storage device and described load, judges the voltage of described energy storage device and the relation between the voltage upper threshold value of its setting and voltage lower threshold value;
If the voltage of described energy storage device is higher than described voltage upper threshold value, then described rearmounted control device closes, described energy storage device and described load are in conducting state, if the voltage of described energy storage device is lower than described voltage lower threshold value, then described rearmounted control device disconnects, and described energy storage device and described load are in off-state.
2. the intermittent output intent of solar cell according to claim 1, is characterized in that, also comprise:
Preposition control device is provided, described preposition control device is located between described solar panel and described energy storage device, when the voltage of described energy storage device is higher than described voltage upper threshold value, described preposition control device disconnects, described solar panel and described energy storage device are in off-state, when the voltage of described energy storage device is lower than described voltage upper threshold value, described preposition control device closes, and described solar panel and described energy storage device are in conducting state.
3. the intermittent output intent of solar cell according to claim 1, it is characterized in that, described solar panel comprises temperature sensor and controller, described temperature sensor is responded to the working temperature of described solar panel in real time and is fed back to described controller, and described controller determines the operating voltage corresponding to its maximum power point according to the working temperature of described solar panel.
4. the intermittent output intent of solar cell according to claim 3, it is characterized in that, the operating voltage corresponding to described solar panel maximum power point sets voltage upper threshold value and the voltage lower threshold value that the voltage upper threshold value of described energy storage device and voltage lower threshold value comprise the dynamically described energy storage device of adjustment setting.
5. the intermittent output intent of solar cell according to claim 1, is characterized in that, the voltage lower threshold value of described energy storage device setting and voltage upper threshold value are in the normal operating voltage range of described load.
6. the intermittent output intent of solar cell according to claim 1, it is characterized in that, described load is direct current machine or inverter.
7. the intermittent output intent of solar cell according to claim 1, it is characterized in that, described energy storage device is super capacitor.
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| CN201510185190.3A CN104836513A (en) | 2015-04-17 | 2015-04-17 | Solar battery intermittent output method |
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| CN201510185190.3A CN104836513A (en) | 2015-04-17 | 2015-04-17 | Solar battery intermittent output method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471077A (en) * | 2016-01-27 | 2016-04-06 | 东莞市开关厂有限公司 | Solar energy integrated intelligent power supply device |
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2015
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| CN1121167A (en) * | 1994-06-02 | 1996-04-24 | 沃达株式会社 | Solar cell system and intermittent motion apparatus using same |
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Application publication date: 20150812 |