Off-grid photovoltaic energy system
By introducing intelligent control units into the photovoltaic energy system, monitoring the power generation status and power quantity information, intelligent charging control of energy storage batteries is realized, and the problem of energy storage batteries in the photovoltaic energy system is solved and the reliability and safety of the system are improved.
Patent Information
- Application Number
- CN202411926068.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-04-04
AI Technical Summary
The existing photovoltaic energy systems may damage the energy storage battery when the charging strategy is not controlled, and lack reliable, stable and safe solutions.
An off-grid photovoltaic energy system is designed, including a photovoltaic power generation system and an energy storage system, and the power generation status and power information are monitored through the first and second control units to realize intelligent charging control to avoid overcharging and damage.
The system can charge the energy storage battery in a timely and safe manner, avoid overcharge damage, and ensure the service life and safety of the energy storage battery.
Smart Images
Figure CN119766074A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of new energy, and more specifically, to an off-grid photovoltaic energy system. Background Art
[0002] With the development of new energy, photovoltaic energy systems, as an important means of developing zero-carbon energy systems, are used in many scenarios.
[0003] During the operation of the photovoltaic energy system, improper control of the charging strategy will damage the energy storage battery. Therefore, a reliable, stable and safe photovoltaic energy system is needed. Summary of the invention
[0004] The present invention provides a new technical solution for an off-grid photovoltaic energy system, which can at least solve the problem of damage to energy storage batteries in the prior art.
[0005] According to the present invention, an off-grid photovoltaic energy system is provided, the off-grid photovoltaic energy system comprising: A photovoltaic power generation system, the photovoltaic power generation system comprising a power generation device and a first control unit electrically connected to each other, the first control unit being capable of monitoring the power generation state of the power generation device of the photovoltaic power generation system to obtain power generation state information, and sending the power generation state information, the power generation state information including a normal power generation state and an abnormal power generation state; an energy storage system, the energy storage system being connected to the photovoltaic power generation system, the energy storage system comprising an energy storage battery and a second control unit electrically connected to each other, the second control unit monitoring the power of the energy storage battery to obtain power information, and the second control unit being capable of receiving the power generation status information from the photovoltaic power generation system, The second control unit can control the photovoltaic power generation system to charge the energy storage battery according to the received information that the photovoltaic power generation system is in a normal power generation state and the power level of the energy storage battery has not reached the upper power limit threshold, and control the photovoltaic power generation system to stop charging the energy storage battery according to the received information that the power level of the energy storage battery has reached the upper power limit threshold.
[0006] Furthermore, the off-grid photovoltaic energy system further comprises: An electric power system, wherein the electric power system is connected to the photovoltaic power generation system and the energy storage system, and the electric power system includes an electric power device and a third control unit electrically connected to each other, and the electric power system can monitor the operation of the electric power device and send operation information, wherein the operation information includes an operation state and an operation power, and the operation state includes a required operation state and a stopped operation state; The second control unit can also receive the working information, and according to the received information that the power system is in the required working state and the working power of the power system is lower than the power generation power of the photovoltaic power generation system, control the photovoltaic power generation system to supply power to the power system through the first power generation, and control the photovoltaic power generation system to supply power to the energy storage battery through the second power generation, The first power generation power of the photovoltaic power generation system is the working power of the power consumption system, and the second power generation power is the remaining power generation power after subtracting the first power generation power from the current power generation power.
[0007] Furthermore, the second control unit can also control the photovoltaic power generation system to supply power to the power system through the current power generation power, and control the energy storage system to supply power to the power system through the difference power, according to the received information that the power system is in the demand working state and the working power of the power system is higher than the power generation power of the photovoltaic power generation system. The differential power is the power obtained by subtracting the current power generation from the working power.
[0008] Furthermore, the second control unit can also obtain the ambient temperature. The second control unit controls the photovoltaic power generation system to charge the energy storage battery according to the ambient temperature within a predetermined charging temperature range; The second control unit controls the photovoltaic power generation system to stop charging the energy storage battery according to the fact that the ambient temperature is not within the predetermined charging temperature range.
[0009] Further, the second control unit controls the photovoltaic power generation system to charge the energy storage battery through a full voltage range according to the ambient temperature being in a first temperature range; The second control unit controls the photovoltaic power generation system to charge the energy storage battery through a partial voltage interval according to the ambient temperature being in the second temperature range, The partial voltage interval is a low voltage interval at the front of the full voltage interval, a first temperature range and a second temperature range, and the lowest value of the first temperature range is greater than the highest value of the second temperature range.
[0010] Furthermore, the second control unit controls the energy storage battery to stop supplying power to the power consumption system according to the fact that the ambient temperature is not within the predetermined discharge temperature range.
[0011] Furthermore, the photovoltaic power generation system includes a first port, the power consumption system includes a fourth port, and the energy storage system includes a second port and a third port. The first port is connected to the second port via a first connection line, the first port is connected to the fourth port via a second connection line, and the third port is connected to the fourth port via a third connection line.
[0012] Furthermore, the second control unit includes: a second monitoring device, wherein the second control unit obtains the power information through the second monitoring device; A signal receiving unit, the signal receiving unit is electrically connected to the second monitoring device to receive the power information, the signal receiving unit is also connected to the first port through the second port and the second connecting line to receive the power generation status information from the photovoltaic power generation system, and the signal receiving unit is also connected to the fourth port through the third port and the second connecting line to receive the working information of the power consumption system; A central processing unit, the central processing unit is electrically connected to the signal receiving unit, the central processing unit is used to receive the power information, the power generation state information and the working information from the signal receiving unit, and process them, so as to generate a second control instruction for controlling the photovoltaic power generation system and a second control instruction for controlling the energy storage battery, and the central processing unit is also electrically connected to the first port through a second port and a second connecting line to send the second control instruction to the photovoltaic power generation system; A second execution device, the second execution device is electrically connected to the central processing unit, and the second execution device is used to receive a second control instruction from the central processing unit and execute the second control instruction.
[0013] Furthermore, the first control unit includes: a first monitoring device, wherein the first control unit obtains the power generation status information through the first monitoring device, and the photovoltaic power generation system is connected to the signal receiving unit through the first monitoring device to send the power generation status information to the signal receiving unit; A first execution device, wherein the first execution device is electrically connected to the first monitoring device, the photovoltaic power generation system is electrically connected to the central processing unit via the first execution device, and the first execution device receives and executes the first control instruction.
[0014] Furthermore, the power consumption system includes one or more of a data center, a monitoring device, and a lighting device.
[0015] According to the off-grid photovoltaic energy system of the present invention, the photovoltaic power generation system includes a power generation device and a first control unit electrically connected to each other. The energy storage system includes an energy storage battery and a second control unit electrically connected to each other. The first control unit sends power generation status information of the power generation device to the second control unit, and the second control unit receives the power generation status information, and controls the photovoltaic power generation system to charge the energy storage battery based on the received information that the photovoltaic power generation system is in a normal power generation state and the power of the energy storage battery has not reached the upper power limit threshold, so that the energy storage battery can be charged in time. The second control unit controls the photovoltaic power generation system to stop charging the energy storage battery based on the received power of the energy storage battery reaching the upper power limit threshold, which can avoid overcharging the energy storage battery and better protect the energy storage battery.
[0016] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
[0018] Figure 1 is a specific application diagram of an off-grid photovoltaic energy system according to an embodiment of the present invention; Figure 2 is a schematic diagram of an off-grid photovoltaic energy system according to an embodiment of the present invention; Figure 3 is a schematic diagram of a photovoltaic power generation system according to an embodiment of the present invention; Figure 4 is a schematic diagram of a first control unit according to an embodiment of the present invention; Figure 5 is a schematic diagram of an energy storage system according to an embodiment of the present invention; Figure 6 is a schematic diagram of a second control unit according to an embodiment of the present invention; Figure 7 is a schematic diagram of an electric power system according to an embodiment of the present invention.
[0019] Reference numerals: 10. Photovoltaic power generation system; 11. Power generation device; 12. First control unit; 121. First monitoring device; 122. First execution device; 13. First port; 20. Energy storage system; 21. Energy storage battery; 22. Second control unit; 221. Second monitoring device; 222. Signal receiving unit; 223. Central processing unit; 224. Second execution device; 23. Second port; 24. Third port; 30. Power consumption system; 31. Power consumption device; 32. Third control unit; 33. Fourth port. DETAILED DESCRIPTION
[0020] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.
[0021] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
[0022] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0023] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0024] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0025] The off-grid photovoltaic energy system according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
[0026] like Figures 1 to 7 As shown, the off-grid photovoltaic energy system according to an embodiment of the present invention includes a photovoltaic power generation system 10 and an energy storage system 20 .
[0027] First, the photovoltaic power generation system 10 is described. The photovoltaic power generation system 10 includes a power generation device 11 and a first control unit 12 electrically connected to each other, and the first control unit 12 can monitor the power generation state of the power generation device 11 of the photovoltaic power generation system 10 to obtain power generation state information, and send the power generation state information, and the power generation state information includes a normal power generation state and an abnormal power generation state.
[0028] like Figures 1 to 3 The photovoltaic power generation system 10 includes a power generation device 11 and a first control unit 12 which are electrically connected to each other. The first control unit 12 can monitor the power generation state of the power generation device 11 of the photovoltaic power generation system 10 to obtain power generation state information, and send the power generation state information to the second control unit 22, and the power generation state information includes a normal power generation state and an abnormal power generation state.
[0029] That is to say, the photovoltaic power generation system 10 sends out power generation status information, which is convenient for relevant personnel to promptly discover abnormal power generation status of the photovoltaic power generation system 10 and perform maintenance, thereby avoiding the situation where the photovoltaic power generation system 10 generates power externally under abnormal circumstances and causes damage to other systems.
[0030] Next, the energy storage system 20 is described. The energy storage system 20 is connected to the photovoltaic power generation system 10, and the energy storage system 20 includes an energy storage battery 21 and a second control unit 22 that are electrically connected to each other. The second control unit 22 monitors the power of the energy storage battery 21 to obtain power information, and the second control unit 22 can receive power generation status information from the photovoltaic power generation system 10.
[0031] The second control unit 22 can control the photovoltaic power generation system 10 to charge the energy storage battery 21 according to the received information that the photovoltaic power generation system 10 is in a normal power generation state and the power level of the energy storage battery 21 has not reached the upper power limit threshold, and control the photovoltaic power generation system 10 to stop charging the energy storage battery 21 according to the received information that the power level of the energy storage battery 21 has reached the upper power limit threshold.
[0032] like Figure 2 and Figure 5 As shown, the energy storage battery 21 is connected to the photovoltaic power generation system 10. The energy storage system 20 includes an energy storage battery 21 and a second control unit 22 which are electrically connected to each other.
[0033] When receiving the information that the photovoltaic power generation system 10 is in a normal power generation state and the power of the energy storage battery 21 is lower than the power upper limit threshold, the second control unit 22 can issue a control instruction to charge the energy storage battery 21 to the photovoltaic power generation system 10, and the photovoltaic power generation system 10 charges the energy storage battery 21 based on the control instruction. In this way, the photovoltaic power generation system 10 can be controlled to charge the energy storage battery 21 in a timely manner.
[0034] During the charging process, the second control unit 22 receives a signal that the power level of the energy storage battery 21 has reached the upper power limit threshold, and the second control unit 22 issues a control instruction to the photovoltaic power generation system 10 to stop charging the energy storage battery 21. Based on the instruction, the photovoltaic power generation system 10 stops charging the energy storage battery 21. In this way, overcharging of the energy storage battery 21 can be avoided.
[0035] In the above off-grid photovoltaic energy system, the photovoltaic power generation system 10 includes a power generation device 11 and a first control unit 12 electrically connected to each other. The energy storage system 20 includes an energy storage battery 21 and a second control unit 22 electrically connected to each other. The first control unit 12 sends the power generation status information of the power generation device 11 to the second control unit 22, and the second control unit 22 receives the power generation status information, and combines the power information obtained by monitoring the energy storage battery 21. According to the received photovoltaic power generation system 10 being in a normal power generation state and the power of the energy storage battery 21 not reaching the upper power limit threshold, the photovoltaic power generation system 10 is controlled to charge the energy storage battery 21, so that the energy storage battery 21 can be charged in time. According to the received power of the energy storage battery 21 reaching the upper power limit threshold, the second control unit 22 controls the photovoltaic power generation system 10 to stop charging the energy storage battery 21, which can avoid overcharging the energy storage battery 21 and better protect the energy storage battery 21.
[0036] In some embodiments of the present invention, the off-grid photovoltaic energy system further includes a power system 30. The power system 30 connects the photovoltaic power generation system 10 and the energy storage system 20. The power system 30 includes a power device 31 and a third control unit 32 electrically connected to each other. The power system 30 can monitor the operation of the power device 31 and send working information. The working information includes working status and working power. The working status includes a required working status and a stopped working status. The second control unit 22 can also receive working information, and according to the received power system 30 being in a required working state, and the working power of the power system 30 is lower than the power generation power of the photovoltaic power generation system 10, the photovoltaic power generation system 10 is controlled to supply power to the power system 30 through the first power generation, and the photovoltaic power generation system 10 is controlled to supply power to the energy storage battery 21 through the second power generation. Among them, the first power generation power of the photovoltaic power generation system 10 is the working power of the power system 30, and the second power generation power is the remaining power generation power after the current power generation power is subtracted from the first power generation power.
[0037] Optionally, the power system 30 includes one or more of a data center, a monitoring device, and a lighting device.
[0038] like Figure 1 As shown, the power consumption system 30 includes a data center, a monitoring device, and a lighting device. The power consumption device 31 is not limited here.
[0039] It should be noted that the present invention does not limit the number of photovoltaic power generation systems 10, energy storage systems 20, and power consumption systems 30. For example, one photovoltaic power generation system 10 can be matched with multiple energy storage systems 20 and multiple power consumption systems 30, one photovoltaic power generation system 10 can be matched with one energy storage system 20 and one power consumption system 30, or one photovoltaic power generation system 10 can be matched with one energy storage system 20 and multiple power consumption systems 30.
[0040] like Figure 2 and Figure 7 As shown, the power consumption system 30 is connected to the photovoltaic power generation system 10 and the energy storage system 20 , and the power consumption system 30 includes a power consumption device 31 and a third control unit 32 which are electrically connected to each other.
[0041] For example, the working power of the power system 30 is 200 W, and the current power generation power of the photovoltaic power generation system 10 is 300 W. The second control unit 22 controls the photovoltaic power generation system 10 to supply 200 W of power to the power system 30 and charge the energy storage system 20 with 100 W.
[0042] When the power generation of the photovoltaic power generation system 10 is greater than the working power of the power consumption system 30, the second control unit 22 sends a control instruction to the photovoltaic power generation system 10, and the photovoltaic power generation system 10 directly supplies power to the power consumption system 30 through the first power generation (the working power of the power consumption system 30) based on the control instruction, thereby improving the photoelectric utilization rate. Moreover, the photovoltaic power generation system 10 charges the energy storage battery 21 that has not reached the upper limit threshold of the power supply through the second power generation (the remaining power generation after the current power generation is subtracted from the first power generation) based on the control instruction, which can avoid the waste of power and efficiently utilize the power generated by the photovoltaic power generation system 10.
[0043] In some embodiments of the present invention, the second control unit 22 can also control the photovoltaic power generation system 10 to supply power to the power system 30 through the current power generation power according to the received control instruction that the power system 30 is in the demand working state and the working power of the power system 30 is higher than the power generation power of the photovoltaic power generation system 10, and control the energy storage system 20 to supply power to the power system 30 through the difference power. The difference power is the power of the difference between the working power and the current power generation power.
[0044] For example, the working power of the power system 30 is 200 W, and the current power generation power of the photovoltaic power generation system 1010 is 120 W. The second control unit 22 controls the photovoltaic power generation system 10100 to supply 120 W of power to the power system 30, and the energy storage system 2020 to supply 80 W of power to the power system 30.
[0045] When the power generation of the photovoltaic power generation system 10 is less than the working power of the power consumption system 30, the current power generation of the photovoltaic power generation system 10 is added to the difference power (the power of the difference between the working power and the current power generation) of the energy storage system 20 to supply power to the power consumption system 30. In this way, the working requirements of the power consumption system 30 can be met to the greatest extent, and the working stability of the power consumption system 30 can be increased.
[0046] In some embodiments of the present invention, the second control unit 22 can also obtain the ambient temperature. The second control unit 22 controls the photovoltaic power generation system 10 to charge the energy storage battery 21 according to the ambient temperature being within the predetermined charging temperature range. The second control unit 22 controls the photovoltaic power generation system 10 to stop charging the energy storage battery 21 according to the ambient temperature not being within the predetermined charging temperature range.
[0047] The ambient temperature has a great influence on the energy storage system 20. The second control unit 22 controls the photovoltaic power generation system 10 to charge the energy storage battery 21 within a predetermined charging temperature range according to the ambient temperature.
[0048] For example, the predetermined charging temperature range is -20 degrees to 60 degrees, that is, the safe temperature range of the energy storage system 20 is -20 degrees to 60 degrees. When the ambient temperature is within the predetermined charging temperature range of -20 degrees to 60 degrees, the photovoltaic power generation system 10 charges the energy storage battery 21. When the ambient temperature is not within the predetermined charging temperature range of -20 degrees to 60 degrees, the photovoltaic power generation system 10 stops charging the energy storage battery 21.
[0049] In this way, it is possible to avoid the situation where the photovoltaic power generation system 10 charges the energy storage battery 21 in an overly high temperature environment or an overly low temperature environment, thereby damaging the energy storage battery 21 , thereby improving the service life of the energy storage battery 21 and increasing the safety of the energy storage battery 21 .
[0050] It should be noted that the above charging temperature range is only an optional example, and the predetermined charging temperature range may also be -30 degrees to 50 degrees, etc., which should be understood to be within the scope of the present invention.
[0051] Further, the second control unit 22 controls the photovoltaic power generation system 10 to charge the energy storage battery 21 through the full voltage range according to the ambient temperature being in the first temperature range. The second control unit 22 controls the photovoltaic power generation system 10 to charge the energy storage battery 21 through the partial voltage range according to the ambient temperature being in the second temperature range. The partial voltage range is a low voltage range in the front part of the full voltage range, the first temperature range and the second temperature range, and the lowest value of the first temperature range is greater than the highest value of the second temperature range.
[0052] For example, the first temperature range is 0 degrees to 60 degrees (excluding 0 degrees), and the corresponding full voltage range is 2.1V to 3.95V; the second temperature range is -20 degrees to 0 degrees (including 0 degrees), and the corresponding partial voltage range is 2.1V to 3.6V. High-voltage charging in a low-temperature environment will cause significant damage to the energy storage battery 21, which may cause a short circuit in the energy storage battery 21 and affect the service life of the energy storage system 20.
[0053] In the first temperature range, the state of the energy storage battery 21 is relatively good, and there are not too many restrictions on the charging voltage (the photovoltaic power generation system 10 can use the full voltage range for charging). The photovoltaic power generation system 10 can charge the energy storage battery 21 with high voltage, and can charge the energy storage battery 21 faster, thereby improving the charging efficiency. In the second temperature range, the maximum value of the charging voltage is limited (the photovoltaic power generation system 10 can only use a partial voltage range for charging), so as to better protect the energy storage battery 21 and reduce safety risks. It should be noted that there is no limitation on the first temperature range, the second temperature range, the full voltage range and the partial voltage range, which can be determined according to the specific characteristics of the energy storage battery 21.
[0054] In some embodiments of the present invention, the second control unit 22 controls the energy storage battery 21 to stop supplying power to the power system 30 according to the fact that the ambient temperature is not within the predetermined discharge temperature range.
[0055] For example, the predetermined discharge temperature range is -40 degrees to 60 degrees. When the ambient temperature is not within this temperature range, the energy storage battery 21 stops supplying power to the power system 30. In this way, the energy storage battery 21 can be better protected, and damage caused by the energy storage battery 21 supplying power in an overly high temperature environment or an overly low temperature environment can be avoided, thereby increasing the service life of the energy storage battery 21.
[0056] It should be noted that the above discharge temperature range is only an optional example, and the predetermined discharge temperature range may also be -50 degrees to 50 degrees, etc., which should be understood to be within the scope of the present invention.
[0057] In some embodiments of the present invention, the photovoltaic power generation system 10 includes a first port 13, the power consumption system 30 includes a fourth port 33, and the energy storage system 20 includes a second port 23 and a third port 24. The first port 13 is connected to the second port 23 through a first connecting line, the first port 13 is connected to the fourth port 33 through a second connecting line, and the third port 24 is connected to the fourth port 33 through a third connecting line.
[0058] like Figure 2 As shown, the first port 13 of the photovoltaic power generation system 10 is electrically connected to the second port 23 of the energy storage system 20 through a first connection line, the first port 13 of the photovoltaic power generation system 10 is electrically connected to the power system 30 through a second connection line, and the energy storage system 20 is electrically connected to the power system 30 through a third connection line. In this way, the photovoltaic power generation system 10, the energy storage system 20 and the power system 30 can be connected stably.
[0059] In some embodiments of the present invention, the second control unit 22 includes a second monitoring device 221, a signal receiving unit 222, a central processing unit 223 and a second execution device 224. The second control unit 22 obtains the power information through the second monitoring device 221. The signal receiving unit 222 is electrically connected to the second monitoring device 221 to receive the power information. The signal receiving unit 222 is also connected to the first port 13 through the second port 23 and the second connecting line to receive the power generation status information from the photovoltaic power generation system 10. The signal receiving unit 222 is also connected to the fourth port through the third port and the second connecting line to receive the working information of the power system. The central processing unit 223 is electrically connected to the signal receiving unit 222. The central processing unit 223 is used to receive the power information, power generation status information and working information from the signal receiving unit 222, and process them to generate a second control instruction for controlling the photovoltaic power generation system 10 and a second control instruction for controlling the energy storage battery. The central processing unit 223 is also electrically connected to the first port 13 through the second port and the second connecting line to send the second control instruction to the photovoltaic power generation system. The second execution device 224 is electrically connected to the central processing unit 223 , and is used for receiving the second control instruction from the central processing unit 223 and executing the second control instruction.
[0060] like Figure 6 As shown, the second monitoring device 221 monitors the power status of the energy storage battery 21, obtains power information, and sends the power information to the signal receiving unit 222. The signal receiving unit 222 also receives power generation status information from the photovoltaic power generation system 10 and receives working information from the power consumption system 30.
[0061] like Figure 6 As shown, the central processing unit 223 processes the power information from the energy storage battery 21, the power generation status information from the photovoltaic power generation system 10, and the working information of the power consumption system 30, so as to generate a first control instruction for controlling the photovoltaic power generation system 10 and a second control instruction for controlling the energy storage battery 21, and sends the first control instruction to the photovoltaic power generation system 10, and the second execution device 224 executes the second control instruction, so that the central processing unit 223 can easily control the energy storage battery 21 and the photovoltaic power generation system 10.
[0062] In some embodiments of the present invention, the first control unit 12 includes a first monitoring device 121 and a first execution device 122. The first control unit 12 obtains power generation status information through the first monitoring device 121, and the photovoltaic power generation system 10 is connected to the signal receiving unit 222 through the first monitoring device 121 to send the power generation status information to the signal receiving unit 222. The first execution device 122 is electrically connected to the first monitoring device 121, and the photovoltaic power generation system 10 is electrically connected to the central processing unit 223 through the first execution device 122. The first execution device 122 receives and executes the first control instruction like Figure 4 As shown, the second monitoring device 221 monitors the state of the power generation device 11, obtains the power generation state information that the power generation state is normal, and sends the power generation state information to the signal receiving unit 222. The signal receiving unit 222 receives the power information of the energy storage battery 21 (the current power is lower than the upper power limit threshold), and the central processing unit 223 integrates the power generation state information and the power information to send a first control instruction to charge the energy storage battery 21 to the second execution device 224. The second execution device 224 executes this first control instruction to control the photovoltaic power generation system 10 to charge the energy storage battery 21. In this way, it is possible to easily realize that the photovoltaic power generation system 10 charges the energy storage battery 21 in a timely manner, and it is possible to easily realize that the photovoltaic power generation system 10 supplies power to the power consumption system 30.
[0063] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. An off-grid photovoltaic energy system, characterized in that: The off-grid photovoltaic energy system comprises: A photovoltaic power generation system (10), the photovoltaic power generation system (10) comprising a power generation device (11) and a first control unit (12) electrically connected to each other, the first control unit (12) being capable of monitoring the power generation state of the power generation device (11) of the photovoltaic power generation system (10) to obtain power generation state information, and sending the power generation state information, the power generation state information comprising a normal power generation state and an abnormal power generation state; An energy storage system (20), the energy storage system (20) being connected to the photovoltaic power generation system (10), the energy storage system (20) comprising an energy storage battery (21) and a second control unit (22) which are electrically connected to each other, the second control unit (22) monitoring the power of the energy storage battery (21) to obtain power information, and the second control unit (22) being capable of receiving the power generation status information from the photovoltaic power generation system (10), The second control unit (22) can control the photovoltaic power generation system (10) to charge the energy storage battery (21) based on the received information that the photovoltaic power generation system (10) is in a normal power generation state and the power level of the energy storage battery (21) has not reached an upper power level threshold, and can control the photovoltaic power generation system (10) to stop charging the energy storage battery (21) based on the received information that the power level of the energy storage battery (21) has reached an upper power level threshold.
2. The off-grid photovoltaic energy system according to claim 1, characterized in that: The off-grid photovoltaic energy system also includes: An electric power system (30), the electric power system (30) being connected to the photovoltaic power generation system (10) and the energy storage system (20), the electric power system (30) comprising an electric power device (31) and a third control unit (32) electrically connected to each other, the electric power system (30) being capable of monitoring the operation of the electric power device (31) and sending operation information, the operation information comprising an operation state and an operation power, the operation state comprising a required operation state and a stopped operation state; The second control unit (22) is also capable of receiving the working information, and based on the received information that the power consumption system (30) is in a demand working state and the working power of the power consumption system (30) is lower than the power generation power of the photovoltaic power generation system (10), controls the photovoltaic power generation system (10) to supply power to the power consumption system (30) through the first power generation, and controls the photovoltaic power generation system (10) to supply power to the energy storage battery (21) through the second power generation. The first power generation of the photovoltaic power generation system (10) is the working power of the power consumption system (30), and the second power generation is the remaining power generation after deducting the first power generation from the current power generation.
3. The off-grid photovoltaic energy system according to claim 2, characterized in that: The second control unit (22) can also control the photovoltaic power generation system (10) to supply power to the power system (30) using the current power generation power, and control the energy storage system (20) to supply power to the power system (30) using the difference power, based on the received information that the power system (30) is in a demand working state and the working power of the power system (30) is higher than the power generation power of the photovoltaic power generation system (10). The differential power is the power obtained by subtracting the current power generation from the working power.
4. The off-grid photovoltaic energy system according to claim 3, characterized in that: The second control unit (22) is also capable of acquiring the ambient temperature. The second control unit (22) controls the photovoltaic power generation system (10) to charge the energy storage battery (21) according to the ambient temperature being within a predetermined charging temperature range; The second control unit (22) controls the photovoltaic power generation system (10) to stop charging the energy storage battery (21) according to the ambient temperature not being within the predetermined charging temperature range.
5. The off-grid photovoltaic energy system according to claim 4, characterized in that: The second control unit (22) controls the photovoltaic power generation system (10) to charge the energy storage battery (21) through a full voltage range according to the ambient temperature being within a first temperature range; The second control unit (22) controls the photovoltaic power generation system (10) to charge the energy storage battery (21) through a partial voltage interval according to the ambient temperature being within a second temperature range. The partial voltage interval is a low voltage interval at the front of the full voltage interval, a first temperature range and a second temperature range, and the lowest value of the first temperature range is greater than the highest value of the second temperature range.
6. The off-grid photovoltaic energy system according to claim 5, characterized in that: The second control unit (22) controls the energy storage battery (21) to stop supplying power to the power consumption system (30) based on the fact that the ambient temperature is not within the predetermined discharge temperature range.
7. The off-grid photovoltaic energy system according to claim 3, characterized in that: The photovoltaic power generation system (10) comprises a first port (13), the power consumption system (30) comprises a fourth port (33), and the energy storage system (20) comprises a second port (23) and a third port (24). The first port (13) is connected to the second port (23) via a first connecting line, the first port (13) is connected to the fourth port (33) via a second connecting line, and the third port (24) is connected to the fourth port (33) via a third connecting line.
8. The off-grid photovoltaic energy system according to claim 7, characterized in that: The second control unit (22) comprises: a second monitoring device (221), wherein the second control unit (22) obtains the power information through the second monitoring device (221); a signal receiving unit (222), the signal receiving unit (222) being electrically connected to the second monitoring device (221) to receive the power quantity information, the signal receiving unit (222) being further connected to the first port (13) via a second port (23) and a second connecting line to receive power generation status information from the photovoltaic power generation system (10), the signal receiving unit (222) being further connected to the fourth port (33) via a third port (24) and the second connecting line to receive the operating information of the power consumption system (30); a central processing unit (223), the central processing unit (223) being electrically connected to the signal receiving unit (222), the central processing unit (223) being used to receive the power information, the power generation state information and the working information from the signal receiving unit (222), and to process the information, thereby generating a second control instruction for controlling the photovoltaic power generation system (10) and a second control instruction for controlling the energy storage battery (21), the central processing unit (223) being also electrically connected to the first port (13) via a second port (23) and a second connecting line, so as to send the second control instruction to the photovoltaic power generation system (10); A second execution device (224), the second execution device (224) is electrically connected to the central processing unit (223), and the second execution device (224) is used to receive a second control instruction from the central processing unit (223) and execute the second control instruction.
9. The off-grid photovoltaic energy system according to claim 8, characterized in that: The first control unit (12) comprises: a first monitoring device (121), wherein the first control unit (12) obtains the power generation status information through the first monitoring device (121), and the photovoltaic power generation system (10) is connected to the signal receiving unit (222) through the first monitoring device (121) to send the power generation status information to the signal receiving unit (222); A first execution device (122), the first execution device (122) is electrically connected to the first monitoring device (121), the photovoltaic power generation system (10) is electrically connected to the central processing unit (223) via the first execution device (122), and the first execution device (122) receives and executes a first control instruction from the central processing unit (223).
10. The off-grid photovoltaic energy system according to claim 2, characterized in that: The power consumption system (30) comprises one or more of a data center, a monitoring device, and a lighting device.