CN216774357U - Photovoltaic energy storage system - Google Patents
Photovoltaic energy storage system Download PDFInfo
- Publication number
- CN216774357U CN216774357U CN202122708902.9U CN202122708902U CN216774357U CN 216774357 U CN216774357 U CN 216774357U CN 202122708902 U CN202122708902 U CN 202122708902U CN 216774357 U CN216774357 U CN 216774357U
- Authority
- CN
- China
- Prior art keywords
- energy storage
- photovoltaic
- control unit
- storage battery
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The application relates to a photovoltaic energy storage system. The energy storage battery unit is used as an energy storage system, and the occupied area is small compared with that of a commonly adopted flywheel system, so that the energy storage battery unit is convenient to apply to various different scenes; meanwhile, the main control unit is arranged, and the control mode of the energy supply control unit is correspondingly adjusted based on the working state information of the energy storage battery unit, the connected load information and the current illumination condition, so that the energy storage and the energy supply of the system can be reasonably scheduled, and the actual requirement can be better met.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a photovoltaic energy storage system.
Background
The problems of difficult natural power supply or high commercial power access cost exist in the scenes of islands, mountainous areas and the like, and if fuel is adopted for power generation, the problems of noise, pollution and the like can be caused. Therefore, a common solution is to generate electricity by using clean energy, such as photovoltaic power generation, to meet the demand of electricity.
In the application of the existing photovoltaic system, a flywheel system is usually adopted as an energy storage system, but the flywheel system has the defects of large floor area and the like, and is inconvenient to apply in partial scenes; meanwhile, the problem of unreasonable power supply scheduling is easy to occur due to the limitation of power generation amount and the like in application.
SUMMERY OF THE UTILITY MODEL
The application provides a photovoltaic energy storage system to solve the problem that an existing photovoltaic system is inconvenient to apply in partial scenes and unreasonable in power supply scheduling.
The above object of the present application is achieved by the following technical solutions:
the embodiment of the application provides a photovoltaic energy storage system, it includes: the system comprises a main control unit, an energy supply control unit, an energy storage battery unit and a photovoltaic power generation assembly;
the main control unit, the energy storage battery unit and the photovoltaic power generation assembly are all connected with the energy supply control unit, and the main control unit is also connected with the energy storage battery unit;
the main control unit is used for monitoring the working state information of the energy storage battery unit and the load information connected with the photovoltaic energy storage system, and correspondingly adjusting the control mode of the energy supply control unit according to the working state information, the load information and the current illumination condition;
the energy supply control unit is used for controlling the photovoltaic power generation assembly to charge the energy storage battery unit or supply power to the load or control the energy storage battery unit to supply power to the load under different control modes.
Optionally, the energy supply control unit comprises a DC/DC module and a DC/AC module; the energy supply control unit charges the energy storage battery unit or supplies power to a direct current load by using the electric energy generated by the photovoltaic power generation assembly through the DC/DC module; the energy supply control unit supplies power to a direct current load or an alternating current load through the DC/AC module by using the electric energy stored by the energy storage battery unit.
Optionally, the photovoltaic energy storage system further includes a battery protection unit disposed between the energy storage battery unit and the energy supply control unit, and the battery protection unit is connected to the main control unit;
the battery protection unit comprises a low-power protection switch, and the main control unit is further used for controlling the low-power protection switch to be switched off when monitoring that the power of the energy storage battery unit is lower than a set value, so as to forbid the energy storage battery unit to discharge.
Optionally, the low power protection switch includes, but is not limited to, a dc relay.
Optionally, the battery protection unit further includes an overcurrent protection switch.
Optionally, the over-current protection switch includes, but is not limited to, a fuse.
Optionally, the energy storage battery unit includes a plurality of high-voltage battery packs connected in series.
Optionally, the high-voltage battery pack comprises a battery and an electric quantity acquisition unit, and the electric quantity acquisition unit is in communication connection with the main control unit.
Optionally, the difference between the open-circuit voltage of the photovoltaic power generation assembly and the nominal voltage of the energy storage battery unit is greater than 30V.
Optionally, the photovoltaic energy storage system further comprises a manual switch;
the photovoltaic power generation assembly is connected with the energy storage battery unit through the manual switch; when the manual switch is closed, the photovoltaic power generation assembly directly charges the energy storage battery unit without the DC/DC module.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the technical scheme provided by the embodiment of the application, the energy storage battery unit is used as the energy storage system, so that the occupied area is small compared with that of a commonly adopted flywheel system, and the energy storage battery unit is convenient to apply to various different scenes; meanwhile, the main control unit is arranged, and the control mode of the energy supply control unit is correspondingly adjusted based on the working state information of the energy storage battery unit, the connected load information and the current illumination condition, so that the energy storage and the energy supply of the system can be reasonably scheduled, and the actual requirement can be better met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic diagram of a photovoltaic energy storage system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a photovoltaic energy storage system according to an embodiment of the present disclosure;
fig. 3 is an enlarged view of the battery protection unit in fig. 2.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In the application of the existing photovoltaic system, a flywheel system is usually adopted as an energy storage system, has the advantages of high power density, long service life and the like, but also has the defects of large occupied area and the like, so that the flywheel system is inconvenient to apply in partial scenes; meanwhile, in practical application, the power generation amount of the photovoltaic module is limited, and the load also needs to supply power during power generation in the daytime, so that the problem of unreasonable power supply scheduling is easily caused, for example, the situation that the power of the energy storage system is insufficient at night and the necessary electric equipment cannot be supplied power may occur, and the basic requirement of a residence or an office area cannot be met.
In order to solve the problems, the application provides a photovoltaic energy storage system and a control method of a charging and discharging process of the photovoltaic energy storage system, the occupied area of the whole system is reduced by adopting a battery unit as an energy storage system, the charging and discharging process is reasonably controlled through a main control unit, and therefore the problem that power supply scheduling is unreasonable is reduced or even avoided. The details of the embodiment are described below by way of examples.
Examples
Referring to fig. 1, fig. 1 is a schematic diagram of a photovoltaic energy storage system according to an embodiment of the present application. As shown in fig. 1, a photovoltaic energy storage System includes a main control unit 1 (BMS), an energy supply control unit 3, an energy storage Battery unit 2 and a photovoltaic power generation assembly 4;
the main control unit 1, the energy storage battery unit 2 and the photovoltaic power generation assembly 4 are connected with the energy supply control unit 3, and the main control unit 1 is also connected with the energy storage battery unit 2; the main control unit 1 is used for monitoring the working state information of the energy storage battery unit 2 and the load information connected with the photovoltaic energy storage system, and correspondingly adjusting the control mode of the energy supply control unit 3 according to the working state information, the load information and the current illumination condition; the energy supply control unit 3 is used for controlling the photovoltaic power generation assembly 4 to charge the energy storage battery unit 2 or supply power to the load or control the energy storage battery unit 2 to supply power to the load under different control modes.
Specifically, energy is stored by the energy storage battery unit 2 (such as a lithium battery), and compared with a flywheel system, the occupied area of the whole system can be effectively reduced, so that the photovoltaic energy storage system can be conveniently established in a severe scene.
And information such as the operating condition of monitoring energy storage battery unit 2 in real time and the load of system connection through main control unit 1, then control energy supply control unit 3's control mode based on corresponding information to can rationally schedule energy storage, the functional process of system, avoid appearing the night power supply not enough scheduling problem. In consideration of the most important role of the electric energy stored in the photovoltaic energy storage system to supply power to necessary electric equipment at night, the main control unit 1 needs to ensure that the electric quantity of the energy storage battery unit 2 is sufficient as much as possible when adjusting the control mode of the energy supply control unit 3, and on the basis, the photovoltaic power generation assembly 4 or the energy storage battery unit 2 can be used for supplying power to a connected direct current load and/or alternating current load according to actual needs.
In order to better implement the above solution, a possible implementation of the relevant structural elements in fig. 1 is illustrated in connection with fig. 2.
In some embodiments, as shown in FIG. 2, the power supply control unit 3 includes a DC/DC module and a DC/AC module; the energy supply control unit 3 charges the energy storage battery unit 2 or supplies power to a direct current load (a DC load in fig. 2) by using the electric energy generated by the photovoltaic power generation assembly 4 through the DC/DC module; the energy supply control unit 3 supplies power to a direct current load or an alternating current load (AC load in fig. 2) by the DC/AC module using the electric energy stored in the energy storage battery unit 2.
More specifically, the DC/DC module may include a photovoltaic input DC/DC module for inputting electric energy to the photovoltaic power generation assembly 4 and a battery output DC/DC module (not shown in the drawings) for outputting electric energy from the energy storage battery unit 2, that is, the electric energy generated by the photovoltaic power generation assembly 4 is transmitted to the energy storage battery unit 2 through the photovoltaic input DC/DC module for storage, and the electric energy output by the energy storage battery unit 2 is transmitted to a direct current load through the battery output DC/DC module for operation of the direct current load.
In addition, when the alternating current load needs to be supplied with power, the electric energy generated by the photovoltaic power generation assembly 4 is transmitted to the alternating current load through the photovoltaic input DC/DC module and the DC/AC module in sequence, or the electric energy output by the energy storage battery unit 2 is transmitted to the alternating current load through the DC/AC module, so that the power supply of the alternating current load is realized.
In addition, as shown in fig. 2 and 3, in some embodiments, the photovoltaic energy storage system further includes a battery protection unit 5 disposed between the energy storage battery unit 2 and the energy supply control unit 3, and the battery protection unit 5 is connected to the main control unit 1; the battery protection unit 5 includes a low battery protection switch, and the main control unit 1 is further configured to control the low battery protection switch to be turned off when monitoring that the battery level (SOC) of the energy storage battery unit 2 is lower than a set value, so as to prohibit the energy storage battery unit 2 from discharging.
Specifically, in practical application, the situation that the energy storage battery unit 2 is over-discharged (the remaining capacity is too low) is inevitable, and the situation may damage the energy storage battery unit 2, so that the low-capacity protection switch is provided in this embodiment, so that when the main control unit 1 monitors that the capacity is too low (lower than a set value, for example, SOC < 10%), the low-capacity protection switch is controlled to be turned off, and thus a main loop (i.e., a loop where the battery protection unit 5 is located) connected with the energy storage battery unit 2 is controlled to be turned off, so that the energy storage battery unit 2 is prohibited from continuing to discharge. As shown in fig. 3, the low power protection switch may adopt a dc relay or other switching devices, which is not limited specifically.
In addition, in some embodiments, as shown in fig. 2 and fig. 3, the battery protection unit 5 further includes an overcurrent protection switch, and the overcurrent protection switch is also disposed on the main circuit connected to the energy storage battery unit 2, and cuts off the main circuit when the output current is too large, so as to prevent the photovoltaic energy storage system or the load from being burned. The overcurrent protection switch includes, but is not limited to, a fuse.
In addition, in some embodiments, as shown in fig. 3, the battery protection unit 5 may further include a shunt, and the main loop current may be detected by the shunt main control unit 1, so as to better adjust the operation state of the system based on the detection.
In addition, in application, the energy storage battery unit 2 can be designed to include a plurality of high-voltage battery packs connected in series, and the output voltage can be increased through the series connection; if necessary, a plurality of high-voltage battery packs can be connected in parallel to increase the capacity. Further, the high voltage battery package can adopt the modularized design, and every module all includes battery and electric quantity acquisition unit, and electric quantity acquisition unit is connected with main control unit 1 communication, and main control unit 1 passes through the current electric quantity that the electric quantity acquisition unit acquireed every battery, so, can realize the electric quantity monitoring of energy storage battery unit 2 on the basis that the convenience was disposed according to the demand to the capacity of energy storage battery unit 2. Among them, the battery is preferably a lithium titanate lithium battery which has the characteristics of ultralow temperature (-30 ℃) and long cycle life (15000 cycles).
In practical application, the capacity of the energy storage battery unit 2The quantity configuration and the number of the photovoltaic modules are reasonably matched, for example, when the battery adopts a model number 1P8S and a nominal voltage U0In the case of an 18.4V lithium battery, the number of high-voltage battery packs is preferably 7 to 17, from which the nominal voltage of the energy storage cell 2 is Uba＝U0N, N is the number of high voltage battery packs connected in series.
Furthermore, in order to better realize the charging of the energy storage battery unit 2 by the photovoltaic power generation assembly 4, it is preferable that the open-circuit voltage U of the photovoltaic power generation assembly 4pvNominal voltage U to the energy storage cell unit 2baIs greater than 30V, i.e. Upv-UbaIs > 30V. In this way, the photovoltaic power generation assembly 4 can realize the independent direct charging of the energy storage battery unit 2.
Furthermore, in some embodiments, as shown in fig. 2, the photovoltaic energy storage system further comprises a manual switch 6; the photovoltaic power generation assembly 4 is connected with the energy storage battery unit 2 through a manual switch 6; when the manual switch 6 is closed, the photovoltaic power generation assembly 4 directly charges the energy storage battery unit 2 without passing through the DC/DC module.
Specifically, in some cases, the photovoltaic power generation assembly 4 may not be able to charge the energy storage battery unit 2 through the energy supply control unit 3, for example, when the main control unit 1 cuts off the main loop through the low power protection switch when the electric quantity of the energy storage battery unit 2 is lower than the set value, and the energy supply control unit 3 and the energy storage battery unit 2 are disconnected, the photovoltaic power generation assembly 4 may not charge the energy storage battery unit 2, therefore, in order to solve this problem, the present embodiment provides the manual switch 6 between the photovoltaic power generation assembly 4 and the energy storage battery unit 2, so that in the foregoing case, the user may manually close the manual switch 6, so that the photovoltaic power generation assembly 4 charges the energy storage battery unit 2, and the system recovers to the normal state.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. A photovoltaic energy storage system, comprising: the system comprises a main control unit, an energy supply control unit, an energy storage battery unit and a photovoltaic power generation assembly;
the main control unit, the energy storage battery unit and the photovoltaic power generation assembly are all connected with the energy supply control unit, and the main control unit is also connected with the energy storage battery unit;
the main control unit is used for monitoring the working state information of the energy storage battery unit and the load information connected with the photovoltaic energy storage system, and correspondingly adjusting the control mode of the energy supply control unit according to the working state information, the load information and the current illumination condition;
the energy supply control unit is used for controlling the photovoltaic power generation assembly to charge the energy storage battery unit or supply power to a load or control the energy storage battery unit to supply power to the load under different control modes;
the energy storage battery unit is connected with the energy supply control unit;
the battery protection unit comprises a low-power protection switch, and the main control unit is further used for controlling the low-power protection switch to be switched off when monitoring that the power of the energy storage battery unit is lower than a set value, so as to forbid the energy storage battery unit to discharge.
2. The photovoltaic energy storage system of claim 1, wherein the energization control unit comprises a DC/DC module and a DC/AC module; the energy supply control unit charges the energy storage battery unit or supplies power to a direct current load by using the electric energy generated by the photovoltaic power generation assembly through the DC/DC module; the energy supply control unit supplies power to a direct current load or an alternating current load by using the electric energy stored by the energy storage battery unit through the DC/AC module.
3. The photovoltaic energy storage system of claim 1, wherein the low-charge protection switch includes, but is not limited to, a dc relay.
4. The photovoltaic energy storage system of claim 1, wherein the battery protection unit further comprises an overcurrent protection switch.
5. The photovoltaic energy storage system of claim 4, wherein the over-current protection switch includes, but is not limited to, a fuse.
6. The photovoltaic energy storage system of claim 1, wherein the energy storage cell unit comprises a plurality of high voltage battery packs connected in series.
7. The photovoltaic energy storage system of claim 6, wherein the high voltage battery pack comprises a battery and an electric quantity acquisition unit, and the electric quantity acquisition unit is in communication connection with the main control unit.
8. The photovoltaic energy storage system of claim 1, wherein the open circuit voltage of the photovoltaic power generation assembly differs from the nominal voltage of the energy storage cells by more than 30V.
9. The photovoltaic energy storage system of claim 2, further comprising a manual switch;
the photovoltaic power generation assembly is connected with the energy storage battery unit through the manual switch; when the manual switch is closed, the photovoltaic power generation assembly directly charges the energy storage battery unit without the DC/DC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122708902.9U CN216774357U (en) | 2021-11-05 | 2021-11-05 | Photovoltaic energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122708902.9U CN216774357U (en) | 2021-11-05 | 2021-11-05 | Photovoltaic energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216774357U true CN216774357U (en) | 2022-06-17 |
Family
ID=81961952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122708902.9U Active CN216774357U (en) | 2021-11-05 | 2021-11-05 | Photovoltaic energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216774357U (en) |
-
2021
- 2021-11-05 CN CN202122708902.9U patent/CN216774357U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110803051B (en) | Energy storage type charging pile and charging system | |
| US20130187465A1 (en) | Power management system | |
| US3930192A (en) | Stand-by power system | |
| US6369463B1 (en) | Apparatus and method for supplying alternative energy and back-up emergency power to electrical devices | |
| US20120175966A1 (en) | Power supply system | |
| CN106849232A (en) | It is a kind of to realize the method and system that electric motor car polylith battery pack automatically switches | |
| KR101612645B1 (en) | Electricity storage device control system | |
| JPH09121461A (en) | Self-charging battery and electric apparatus employing it | |
| CN112165156A (en) | Charging/discharging device, battery system, charging/discharging control method, and storage medium | |
| CN107359689A (en) | A kind of intelligent solar charging system | |
| JP3581699B2 (en) | Power supply system and control method thereof | |
| CN112803578A (en) | Intelligent distribution network power supply module and management method | |
| CN216774357U (en) | Photovoltaic energy storage system | |
| US20140274219A1 (en) | Telecommunication Power System | |
| CN115811116A (en) | Self-adaptive power supply management system and method and energy storage power supply | |
| CN105425165B (en) | Lead-acid accumulator is internalized into the test of bus-type charge-discharge machine and aging storage battery simulation system | |
| CN201616699U (en) | Charger | |
| CN114123447A (en) | Photovoltaic energy storage system and control method thereof | |
| Cavallaro et al. | Smart photovoltaic UPS system for domestic appliances | |
| CN102148524A (en) | Charger | |
| CN201616691U (en) | Charger | |
| CN220043018U (en) | Energy storage device and energy storage system | |
| JP2004080942A (en) | Chargeable power supply apparatus | |
| CN219513801U (en) | Light storage integrated device | |
| CN217607548U (en) | Energy storage structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |