Anti-countercurrent photovoltaic energy storage system
By controlling the switch with an anti-reverse current mechanism, the problem of reverse current between the battery and the grid in the photovoltaic energy storage system is solved, and the system can operate stably under load fluctuations.
Patent Information
- Application Number
- CN202423207743.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing photovoltaic energy storage systems are prone to reverse current between the battery and the grid when the load power fluctuates, causing the system to be unable to carry the load normally.
An anti-reverse current mechanism is used to control the first and second switches, respectively blocking the connection between the battery and the inverter mechanism and the connection between the power grid and the inverter mechanism. Real-time data is obtained through the main control module and the acquisition module, and strategies are formulated to control the opening and closing of the switches to prevent current backflow.
It effectively prevents reverse current flow between the battery and the power grid under various conditions, ensuring the system operates normally under all operating conditions.
Smart Images
Figure CN223729458U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of photovoltaic energy storage, in particular to a reverse current prevention photovoltaic energy storage system. BACKGROUND
[0002] The photovoltaic energy storage system is a power generation system composed of photovoltaic, inverter device and energy storage equipment. In the case of grid connection of the photovoltaic energy storage system, if the required power of the load is greater than the maximum power of the photovoltaic and the battery, the photovoltaic, the battery and the power grid jointly bear the load, if the required power of the load is less than the maximum power of the photovoltaic, the photovoltaic bears the load, and the remaining power of the photovoltaic is used for charging the battery and / or supplying the power grid.
[0003] In the prior art, a reverse current prevention device is arranged to limit the excess power of the photovoltaic to feed the power grid, but when the power of the load suddenly fluctuates greatly, the battery is also prone to reverse current phenomenon, and the actual charge / discharge condition is opposite to the preset, which easily leads to the failure of the photovoltaic energy storage system to normally bear the load. CONTENT OF THE UTILITY MODEL
[0004] The application provides a reverse current prevention photovoltaic energy storage system for preventing the reverse current of the battery and the power grid.
[0005] The reverse current prevention photovoltaic energy storage system provided by the application adopts the following technical scheme:
[0006] The reverse current prevention photovoltaic energy storage system comprises a photovoltaic mechanism, an inverter mechanism, a reverse current prevention mechanism, a battery, a load and a power grid. The output end of the photovoltaic mechanism is connected to the direct current input end of the inverter mechanism, the energy storage end of the inverter mechanism is connected to the battery through a first switch, the alternating current end is connected to the power grid through a second switch, the load end is connected to the load, and the communication end is connected to the reverse current prevention mechanism. The reverse current prevention mechanism is connected to the first switch and the second switch and is used for controlling the first switch and the second switch.
[0007] Preferably, the inverter mechanism comprises a main control module, a direct current conversion module, a battery measurement module, a first inverter module and a second inverter module. The main control module is connected to the reverse current prevention mechanism and is connected to the direct current conversion module, the battery measurement module, the first inverter module and the second inverter module. The direct current conversion module is connected to the photovoltaic mechanism. The battery measurement module is connected to the battery and is in communication connection with the reverse current prevention mechanism. The first inverter module is connected to the load. The second inverter module is connected to the power grid through the second switch.
[0008] Preferably, the master module comprises a first output end, a second output end, a third output end and a fourth output end, the first output end is connected to the direct current conversion module, the second output end is connected to the battery, the third output end is connected to the first inverter module, and the fourth output end is connected to the second inverter module.
[0009] Preferably, the anti-reverse flow mechanism comprises a collection module, a data processing module, a first control module and a second control module; the collection module is connected to the output end of the photovoltaic mechanism, the input end of the load and the input end of the power grid, the output end of the collection module is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the first control module and the second control module, the output end of the first control module is connected to the first switch and the second switch, and the output end of the second control module is connected to the inverter mechanism.
[0010] Preferably, the collection module comprises a first input end, a second input end, a third input end and a fourth input end, the first input end is connected to the photovoltaic mechanism for acquiring current, voltage and power data of the photovoltaic mechanism, the second input end is connected to the battery measurement module for acquiring current, current direction, voltage, power and power data of the battery through the battery measurement module, the third input end is connected to the load for acquiring current, voltage and power data of the load, and the fourth input end is connected to the power grid for acquiring current, current direction, voltage and power data of the power grid.
[0011] Preferably, the first switch is a first relay, and the second switch is a second relay.
[0012] In summary, the present application has at least one of the following beneficial technical effects:
[0013] The anti-reverse flow photovoltaic energy storage system of the present application controls the first switch and the second switch through the anti-reverse flow mechanism, thereby blocking the connection structure between the battery and the inverter mechanism and the connection structure between the power grid and the inverter mechanism, and effectively preventing the current reverse flow phenomenon of the battery and the power grid under various conditions. BRIEF DESCRIPTION OF DRAWINGS
[0014] Fig. 1 is a schematic diagram of the overall structure of the preferred embodiment of the present application.
[0015] Fig. 2 is a schematic diagram of the structure of the inverter mechanism in the preferred embodiment of the present application.
[0016] Fig. 3is a structural schematic diagram of the anti-backflow mechanism in the preferred embodiment of the present application.
[0017] BRIEF DESCRIPTION OF DRAWINGS: 1, photovoltaic mechanism; 2, inverter mechanism; 21, main control module; 211, first output end; 212, second output end; 213, third output end; 214, fourth output end; 22, direct current conversion module; 23, battery measurement module; 24, first inverter module; 25, second inverter module; 3, anti-backflow mechanism; 31, acquisition module; 311, first input end; 312, second input end; 313, third input end; 314, fourth input end; 32, data processing module; 33, first control module; 34, second control module; 4, battery; 5, load; 6, power grid; 7, first switch; 8, second switch. DETAILED DESCRIPTION
[0018] The present application is further described in detail below with reference to the accompanying drawings.
[0019] The present application provides an anti-backflow photovoltaic energy storage system, such as Figs. 1 to 3 including photovoltaic mechanism 1, inverter mechanism 2, anti-backflow mechanism 3, battery 4, load 5 and power grid 6; the output end of photovoltaic mechanism 1 is connected to the direct current input end of inverter mechanism 2, the energy storage end of inverter mechanism 2 is connected to battery 4 through first switch 7, the alternating current end is connected to power grid 6 through second switch 8, the load 5 end is connected to load 5, the communication end is connected to anti-backflow mechanism 3, and anti-backflow mechanism 3 is connected to first switch 7 and second switch 8 for controlling first switch 7 and second switch 8.
[0020] In the specific working process of the anti-backflow photovoltaic energy storage system of the present application, when the power of load 5 is less than the maximum power of photovoltaic, the photovoltaic is loaded, anti-backflow mechanism 3 connects first switch 7, so that the remaining power of photovoltaic charges battery 4, and when the current at the input end of power grid 6 reaches the preset limit, it indicates that the current of photovoltaic appears reverse flow phenomenon, anti-backflow mechanism 3 controls second switch 8 to disconnect second switch 8 to prevent current reverse flow, when the power of load 5 suddenly increases to be greater than the sum of the maximum power of photovoltaic and battery 4, and battery 4 is still in charging mode, anti-backflow mechanism 3 disconnects first switch 7 and connects second switch 8, to prevent photovoltaic from continuing to charge battery 4 in the process of loading, and to make photovoltaic and power grid 6 load at the same time, when it is detected that the charging mode of battery 4 changes to the expected discharging mode, first switch 7 is opened, so that the priority of photovoltaic is the first, the priority of battery 4 is the second, and the priority of power grid 6 is the last, compared with the prior art, the anti-backflow photovoltaic energy storage system of the present application controls first switch 7 and second switch 8 by setting anti-backflow mechanism 3, effectively preventing the current reverse flow phenomenon of battery 4 and power grid 6 under various conditions.
[0021] As Fig. 2As shown, the inverter 2 includes a master module 21, a direct current conversion module 22, a battery measurement module 23, a first inverter module 24 and a second inverter module 25, the master module 21 is connected with the anti-backflow mechanism 3 and connected on the direct current conversion module 22, the battery measurement module 23, the first inverter module 24 and the second inverter module 25, the direct current conversion module 22 is connected with the photovoltaic mechanism 1, the battery measurement module 23 is connected with the battery 4 and connected in communication with the anti-backflow mechanism 3, the first inverter module 24 is connected on the load 5, the second inverter module 25 is connected with the power grid 6 through the second switch 8; the master module 21 includes a first output end 211, a second output end 212, a third output end 213 and a fourth output end 214, the first output end 211 is connected on the direct current conversion module 22, the second output end 212 is connected on the battery 4, the third output end 213 is connected on the first inverter module 24, and the fourth output end 214 is connected on the second inverter module 25; the first switch 7 is a first relay, and the second switch 8 is a second relay.
[0022] The photovoltaic mechanism 1 is used for converting solar energy into electric energy, the electric energy is sent to the direct current conversion module 22 in the form of current, and the direct current conversion module 22 outputs direct current with a specified voltage, the master module 21 is used for controlling the conversion power of the direct current conversion module 22 through the first output end 211, the battery measurement module 23 measures the basic parameters of the battery 4, including voltage, current, temperature, power, electric quantity and the like, so as to prevent the battery 4 from overcharging and overdischarging, prolong the service life of the battery 4, and obtain the relevant data of voltage, current, temperature, power and electric quantity and send them to the anti-backflow mechanism 3, the master module 21 is used for adjusting the working mode and output / input power of the battery 4 through the second output end 212, the first inverter module 24 is used for outputting the direct current as alternating current with a preset voltage to supply the load 5 through the third output end 213, the second inverter module 25 is used for outputting the direct current as alternating current with a preset voltage to the power grid 6 through the fourth output end 214, or outputting the alternating current from the power grid 6 as direct current with a preset voltage, the master module 21 is a control mainboard, the direct current conversion module 22 is a DC / DC converter, the battery measurement module 23 is a BMS protection board, the first inverter module 24 is a first DC / AC converter, the second inverter module 25 is a second bidirectional DC / AC converter, and the photovoltaic mechanism 1 is a photovoltaic array.
[0023] As Fig. 3As shown, the anti-reverse flow mechanism 3 includes a collection module 31, a data processing module 32, a first control module 33 and a second control module 34; the collection module 31 is connected to the output end of the photovoltaic mechanism 1, the input end of the load 5 and the input end of the power grid 6, the output end of the collection module 31 is connected to the input end of the data processing module 32, the output end of the data processing module 32 is connected to the input end of the first control module 33 and the second control module 34, the output end of the first control module 33 is connected to the first switch 7 and the second switch 8, the output end of the second control module 34 is connected to the inverter mechanism 2, the collection module 31 includes a first input end 311, a second input end 312, a third input end 313 and a fourth input end 314, the first input end 311 is connected to the photovoltaic mechanism 1, for obtaining the current, voltage and power data of the photovoltaic mechanism 1, the second input end 312 is connected to the battery measurement module 23, for obtaining the current, current direction, voltage, power and power data of the battery 4 through the battery measurement module 23, the third input end 313 is connected to the load 5, for obtaining the current, voltage and power data of the load 5, the fourth input end 314 is connected to the power grid 6, for obtaining the current, current direction, voltage and power data of the power grid 6, the relevant data of the photovoltaic mechanism 1, the battery 4, the load 5 and the power grid 6 are transmitted to the data processing module 32 through the first input end 311, the second input end 312, the third input end 313 and the fourth input end 314 respectively, the data processing module 32 formulates relevant strategies according to the obtained data, and transmits the strategy instructions to the first control module 33 and the second control module 34, the first control module 33 opens or closes the first switch 7 and opens or closes the second switch 8 according to the instructions, the second control module 34 is connected to the direct current conversion module 22, the battery 4, the first inverter module 24 and the second inverter module 25, and controls the direct current conversion module 22, the battery 4, the first inverter module 24 and the second inverter module 25 according to the instructions, so as to achieve the purpose of preventing the battery 4 and the power grid 6 from flowing in reverse, the collection module 31 is a collection mainboard, the data processing module 32 is a data processing mainboard, the first control module 33 is a first control board, and the second control module 34 is a second control board.
[0024] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A reverse flow prevention photovoltaic energy storage system, characterized in that: comprising a photovoltaic mechanism (1), an inverter mechanism (2), a reverse flow prevention mechanism (3), a battery (4), a load (5) and a power grid (6); the output end of the photovoltaic mechanism (1) is connected to the DC input end of the inverter mechanism (2), the energy storage end of the inverter mechanism (2) is connected to the battery (4) through the first switch (7), the AC end is connected to the power grid (6) through the second switch (8), the load end is connected to the load (5), and the communication end is connected to the reverse flow prevention mechanism (3); the reverse flow prevention mechanism (3) is connected to the first switch (7) and the second switch (8) and is used for controlling the first switch (7) and the second switch (8). The inverter mechanism (2) comprises a main control module (21), a DC conversion module (22), a battery measurement module (23), a first inverter module (24) and a second inverter module (25); the main control module (21) is connected to the reverse flow prevention mechanism (3) and is connected to the DC conversion module (22), the battery measurement module (23), the first inverter module (24) and the second inverter module (25); the DC conversion module (22) is connected to the photovoltaic mechanism (1); the battery measurement module (23) is connected to the battery (4) and is in communication connection with the reverse flow prevention mechanism (3); the first inverter module (24) is connected to the load (5); and the second inverter module (25) is connected to the power grid (6) through the second switch (8).
3. The reverse flow prevention photovoltaic energy storage system according to claim 2, characterized in that: the main control module (21) comprises a first output end (211), a second output end (212), a third output end (213) and a fourth output end (214); the first output end (211) is connected to the DC conversion module (22); the second output end (212) is connected to the battery (4); the third output end (213) is connected to the first inverter module (24); and the fourth output end (214) is connected to the second inverter module (25).
2. A reverse current protection photovoltaic energy storage system according to claim 1, wherein: The reverse flow prevention mechanism (3) comprises an acquisition module (31), a data processing module (32), a first control module (33) and a second control module (34); the acquisition module (31) is connected to the output end of the photovoltaic mechanism (1), the input end of the load (5) and the input end of the power grid (6); the output end of the acquisition module (31) is connected to the input end of the data processing module (32); the output end of the data processing module (32) is connected to the input end of the first control module (33) and the second control module (34); the output end of the first control module (33) is connected to the first switch (7) and the second switch (8); and the output end of the second control module (34) is connected to the inverter mechanism (2).
5. The reverse flow prevention photovoltaic energy storage system according to claim 4, characterized in that: 4. The anti-inversion photovoltaic energy storage system of claim 2, wherein: The acquisition module (31) comprises a first input end (311), a second input end (312), a third input end (313) and a fourth input end (314), the first input end (311) is connected to the photovoltaic mechanism (1) for acquiring current, voltage and power data of the photovoltaic mechanism (1), the second input end (312) is connected to the battery measurement module (23) for acquiring current, current direction, voltage, power and electric quantity data of the battery (4) through the battery measurement module (23), the third input end (313) is connected to the load (5) for acquiring current, voltage and power data of the load (5), and the fourth input end (314) is connected to the power grid (6) for acquiring current, current direction, voltage and power data of the power grid (6).
6. The anti-reverse flow photovoltaic energy storage system according to claim 1, characterized in that: The first switch (7) is a first relay, and the second switch (8) is a second relay.