CN107968476A - Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system - Google Patents
Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system Download PDFInfo
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- CN107968476A CN107968476A CN201711426056.3A CN201711426056A CN107968476A CN 107968476 A CN107968476 A CN 107968476A CN 201711426056 A CN201711426056 A CN 201711426056A CN 107968476 A CN107968476 A CN 107968476A
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- photovoltaic
- photovoltaic module
- electrically connected
- voltage
- storage battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses photovoltaic module voltage variable in photovoltaic generation energy-storage system and storage battery to configure, including photovoltaic module, direct current charge-discharge controller, inverter, load, first duplex relay, second duplex relay and storage battery, two photovoltaic modulies are connected in parallel by the first duplex relay, described second duplex relay one end is electrically connected with photovoltaic module, the other end is electrically connected with direct current charge-discharge controller, the direct current charge-discharge controller is electrically connected with inverter and storage battery respectively, the inverter is electrically connected with load, the second duplex relay is equipped with DC/DC modules with direct current charge-discharge controller.The present invention is using easy-to-use method, simple structure, cheap cost, make full use of the dim light of solar energy, the charge mode of current photovoltaic autonomous system, suitable for China poor areas of the western region resident and frontier and island army, the power supply of travelling team etc. will effectively be improved.
Description
Technical field
The present invention relates to electricity generation system field in photovoltaic industry, is specifically photovoltaic group variable in photovoltaic generation energy-storage system
Part voltage is configured with storage battery.
Background technology
Photovoltaic generation energy-storage system refers to commonly used in independently of network system, having independent power generation, autonomous energy storage and having control
The photovoltaic generating system of system ground output electric energy.It is commonly used in the village from far-off regions away from power grid, herdsman, islander, trip
Swim sight spot, frontier sentry, flowing geological prospecting personnel etc. electric power system, and city street lamp.Existing photovoltaic charged system
System, basic form have three essential electrical components, please refer to Fig.1.First, solar panel, i.e. photovoltaic module（Hereinafter referred to as " group
Part "）, second is the storage battery for storing electric energy；3rd is charging-discharging controller（Referred to as " controller "）.Be limited to price because
Element, the past and in the future, lead-acid accumulator all by be in electricity generation system store electric energy critical piece.The specification of lead-acid accumulator,
According to the configuration of system, the different size between 20Ah to 300Ah is respectively adopted.No matter any capacity, single storage
Cell voltage is 12V, power supply（That is component）Charging voltage and battery tension should be 1.4-1.5 times of voltage differences.Therefore, light
The operating voltage for lying prostrate component should be in 18V or so（Discussed below using 18 V as unified value）.Every cell piece of photovoltaic module
No matter its size, output voltage is 0.5V, and therefore, to the component of 12V storage batteries charging, the quantity of cell piece should be
36.In practical application, according to different loads power and its power consumption, the capacity of design electrification energy storage system, using different numbers
The component and storage battery of amount.But its total configuration, for the relation of component voltage and battery tension, should all obey 18V
Basic configuration of the component of voltage with 12V storage batteries or its multiple.Since photovoltaic module is produced electricl energy by sunlight,
The voltage and current of component necessarily changes with the change of solar irradiance.It can be seen from the above that when in every morning, dusk and the moon
Under conditions of rainy day, solar irradiance is less than 250W/m2When left and right, the output voltage of component can not meet more than storage battery
1.4-1.5 times of the requirement of 12 V, component charge a battery deficiency.This part of electric energy is wasted.
The content of the invention
It is an object of the invention to provide photovoltaic module voltage and storage battery variable in a kind of photovoltaic generation energy-storage system
Configuration, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides following technical solution：
Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system, including photovoltaic module, direct current charge-discharge
Controller, inverter, load, the first duplex relay, the second duplex relay and storage battery, two photovoltaic modulies pass through
First duplex relay is connected in parallel, and described second duplex relay one end is electrically connected with photovoltaic module, and the other end is filled with direct current
Discharge controller is electrically connected, and the direct current charge-discharge controller is electrically connected with inverter and storage battery respectively, the inverter and
Load is electrically connected, and the second duplex relay is equipped with DC/DC modules, the cathode of DC/DC modules with direct current charge-discharge controller
Output terminal connects an anti-reverse charging diode to direct current charge-discharge controller.
As the further scheme of the present invention：Described two photovoltaic modulies are connected by the first duplex relay to be connected
Connect, described second duplex relay one end is electrically connected with photovoltaic module, and the other end is electrically connected with DC/DC modules, the DC/DC moulds
Block is electrically connected with direct current charge-discharge controller.
As further scheme of the invention：The connection sheet of the first duplex relay and the second duplex relay is jumped
It is dynamic to be controlled by voltage.
As further scheme of the invention：The photovoltaic module voltage is 18V.
Compared with prior art, the beneficial effects of the invention are as follows：The power of photovoltaic module of the invention to design configurations is not
Become, the power of single component is halved, and the quantity of component then doubles, reconfiguring and change by circuit system,
Under conditions of sunlight decrease, increase the output voltage of component, be allowed to keep the voltage request to storage battery charging, using simplicity
Easy method, simple structure, cheap cost, make full use of the dim light of solar energy, it is only will effectively to improve current photovoltaic
The charge mode of erection system, suitable for China poor areas of the western region and frontier guards, travelling team.
Variable photovoltaic module voltage can also be applied to grid-connected with storage battery configuration in photovoltaic generation energy-storage system
In the energy-storage system of power generation.
Brief description of the drawings
Fig. 1 is that the circuit structure of the prior art that photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system shows
It is intended to.
Fig. 2 is photovoltaic module voltage variable in photovoltaic generation energy-storage system and the circuit of the embodiment 1 of storage battery configuration
Structure diagram.
Fig. 3 is photovoltaic module voltage variable in photovoltaic generation energy-storage system and the circuit of the embodiment 2 of storage battery configuration
Structure diagram.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
Embodiment 1
Referring to Fig. 2, in the embodiment of the present invention, variable photovoltaic module voltage is matched somebody with somebody with storage battery in photovoltaic generation energy-storage system
Put, including photovoltaic module 1, direct current charge-discharge controller 2, inverter 3, the 4, first duplex relay 5 of load, the second duplex relay
Device 6 and storage battery, two photovoltaic modulies 1 are connected in parallel by the first duplex relay 5, for changing the connection side of component
Formula, when connection sheet and the upper contact portion of relay, the cathode of two block assemblies interconnects, and anode interconnects, and forms simultaneously
Join circuit, 1 voltage of photovoltaic module is 18V voltage class, is met to storage battery charging requirement, the second duplex relay
6 one end are electrically connected with photovoltaic module 1, and the other end is electrically connected with direct current charge-discharge controller 2, the direct current charge-discharge controller 2
Be electrically connected respectively with inverter 3 and storage battery, the inverter 3 is electrically connected with load 4, the second duplex relay 6 with it is straight
Stream charging-discharging controller 2 is equipped with DC/DC modules 8（The function of DC/DC modules 8 is the input voltage that will be fluctuated within the specific limits,
By module, one stable voltage of output is kept）, when photovoltaic module 1 is connected in parallel, will additionally be increased using DC/DC modules 8
System loss, therefore, the second duplex relay 6 skip to upper contact, and isolation DC/DC modules 8 are straight by the output of photovoltaic module 1
Direct current charge-discharge controller 2 is attached to, one anti-reverse charging diode 7 of cathode output end series connection of DC/DC modules 8 arrives direct current charge and discharge
Electric controller 2, when system is in 1 state of embodiment, using the characteristic of diode unilateral conduction, has obstructed from photovoltaic group
The circuit that the anode that the cathode of part output is exported by 8 internal circuit of DC/DC modules to photovoltaic module is formed, that is, avoid photovoltaic group
The loss of part output power, while also protect DC/DC modules 8.
The connection sheet bounce of the first duplex relay 5 and the second duplex relay 6 is controlled by voltage, which can be with
The output voltage of any one block assembly is derived from, when voltage is higher than a certain value, relay is in " normally closed ", works as component voltage
At or below a certain value, connection sheet jumps to " normally opened " state, and magnitude of voltage can be according to the reality of other components of electricity generation system
State is artificially set.
Embodiment 2
Referring to Fig. 3, difference from Example 1 is, described two photovoltaic modulies 1 pass through the first duplex relay 5
It is connected in series, total voltage is not more than the maximum input voltage of direct current charge-discharge controller 2, described second duplex relay, 6 one end
It is electrically connected with photovoltaic module 1, the other end is electrically connected with DC/DC modules 8, the DC/DC modules 8 and direct current charge-discharge controller 2
It is electrically connected, the connection sheet of the second duplex relay 6 is beated to bottom, 1 voltage of photovoltaic module to be made by the decompression of DC/DC modules 8
With output 18V voltages, are connected to direct current charge-discharge controller 2, so as to fulfill the change of circuit structure, are also ensureing system just
Often work.
The present invention, by the power of an original block assembly, is divided into two pieces in use, the component power configuration of photovoltaic generating system
Component, every block assembly after being divided into, power halve, and voltage is constant.The quantity of component is increased but general power is constant, can there is two
Kind method is realized, first, 36 high-power battery pieces are cut into bisection with laser cutting machine, then respectively with 36 batteries
Piece is assembled into two pieces of battery components；Second, the inefficient cell piece assembling of selection.The principle of method one and method two is to ensure two pieces
The general power of component meets designing scheme；Increase fills a Wiring connector between two block assemblies（That is duplex relay）Or can be with
There is equal electronic device with any, the action of Wiring connector is controlled using component voltage, connected to component
With control in parallel, when solar irradiance meets the voltage request that component charges a battery, component forms parallel circuit；When
Sunlight weakens, and component voltage declines to a certain extent, and connector is touched according to the component voltage signal of collection by Wiring connector
The bounce of point, drive component form series circuit, improve the output voltage of component；When component is connected, voltage is increased to component
2 times of voltage, by a DC/DC module or with electronics voltage changer or it is any there is equal electronic device, protect
One constant voltage of output is held, to meet the voltage request to storage battery charging.It is permanent possessed by direct current charge-discharge controller
Charging modes, or constant current charging method or dynamic voltage and current charging modes are pressed, not in present invention model of interest
Within enclosing；For photovoltaic module under certain illumination condition, its output power is P=I * V, therefore, when component changes from parallel connection
During to connect, the change of total output power turns to voltage liter and doubles, and electric current reduces 1/2, P '=Δ 1I * Δ 2V, and Δ 1 changes
Rate and 2 rate of change of Δ are reverse and equal, and P=P ' gross outputs are constant, and when passing through DC/DC, the high voltage after series connection
When dropping to 18V and be connected to storage battery charging, according to power invariability principle, charging current will improve, more than series circuit
Output current.And very little is lost more than 95% in the transfer efficiency of DC/DC.The present invention is made full use of under daily morning and evening low light condition
The generated energy of component, it is more than hour to extend 1 by photovoltaic generating system daily effective charging interval, and in rainy days, it is real
The charging interval on border will be up to a few hours or a whole day.Especially in the winter time, since the sun is located at the Southern Hemisphere, even if daytime, to north
The irradiation of hemisphere is reduced as latitude raises, also only 60-80% of summer or so.The night length in winter, user is to electricity consumption
Demand is more.The use of the present invention, will obtain extensive economic benefit and social benefit；The increased expense of institute of the invention, only limits
In two duplex relays, a DC/DC module and a diode, total expense will be obtained less than 150 yuan of RMB
The photovoltaic generating system economic benefit permanent and stable during use of 25 years, meets the power demand of user to greatest extent.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference numeral in claim should not be considered as to the involved claim of limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical solution, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (4)
1. variable photovoltaic module voltage is configured with storage battery in a kind of photovoltaic generation energy-storage system, including photovoltaic module（1）, it is straight
Flow charging-discharging controller（2）, inverter（3）, load（4）, the first duplex relay（5）, the second duplex relay（6）And electric power storage
Pond, it is characterised in that two photovoltaic modulies（1）Pass through the first duplex relay（5）Be connected in parallel, second duplex after
Electric appliance（6）One end and photovoltaic module（1）It is electrically connected, the other end and direct current charge-discharge controller（2）It is electrically connected, the direct current charge and discharge
Electric controller（2）Respectively with inverter（3）It is electrically connected with storage battery, the inverter（3）With load（4）It is electrically connected, described the
Two duplex relays（6）With direct current charge-discharge controller（2）Between be equipped with DC/DC modules（8）, DC/DC modules（8）Cathode it is defeated
Outlet one anti-reverse charging diode of series connection（7）To direct current charge-discharge controller（2）.
2. variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system according to claim 1, its
It is characterized in that, described two photovoltaic modulies（1）Pass through the first duplex relay（5）Be connected in series, second duplex after
Electric appliance（6）One end and photovoltaic module（1）It is electrically connected, the other end and DC/DC modules（8）It is electrically connected, the DC/DC modules（8）With
Direct current charge-discharge controller（2）It is electrically connected.
3. variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system according to claim 1, its
It is characterized in that, the first duplex relay（5）With the second duplex relay（6）Connection sheet bounce controlled by voltage.
4. variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system according to claim 1, its
It is characterized in that, the photovoltaic module（1）Voltage be 18V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711426056.3A CN107968476A (en) | 2017-12-26 | 2017-12-26 | Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system |
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| CN201711426056.3A CN107968476A (en) | 2017-12-26 | 2017-12-26 | Variable photovoltaic module voltage is configured with storage battery in photovoltaic generation energy-storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004863A (en) * | 2018-08-06 | 2018-12-14 | 中国矿业大学 | A kind of thermoelectricity phase transformation building enclosure system and application method |
| CN111337806A (en) * | 2020-03-06 | 2020-06-26 | 浙江正泰新能源开发有限公司 | Photovoltaic module cleaning judgment method, device, equipment and medium |
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| CN109004863A (en) * | 2018-08-06 | 2018-12-14 | 中国矿业大学 | A kind of thermoelectricity phase transformation building enclosure system and application method |
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| CN111337806B (en) * | 2020-03-06 | 2022-10-04 | 浙江正泰新能源开发有限公司 | Photovoltaic module cleaning judgment method, device, equipment and medium |
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