Photovoltaic grid-connected system and control method thereof
By optimizing the control method of the photovoltaic grid-connected system, the problem of overlapping peak periods between peak-shaving units and photovoltaic power generation has been solved, achieving efficient consumption of photovoltaic power and improving the economic benefits of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUANENG NANJING GAS TURBINE POWER GENERATION CO LTD
- Filing Date
- 2026-01-05
- Publication Date
- 2026-04-21
AI Technical Summary
Peak-shaving units and photovoltaic power generation overlap during peak periods, resulting in low contribution of photovoltaic power to the purchased power of peak-shaving units, and the economic benefits of photovoltaic power generation systems are not fully realized.
Design a photovoltaic grid-connected access system that controls the switching of multiple photovoltaic grid-connected lines and peak-shaving units through a control unit, optimizes the distribution of photovoltaic power, and ensures that photovoltaic power directly offsets the external power consumption during the start-up phase of the peak-shaving units.
This has increased the utilization rate of photovoltaic power and improved the economic benefits of photovoltaic power generation systems.
Smart Images
Figure CN121906609A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic grid connection technology, and in particular to a photovoltaic grid connection system and its control method. Background Technology
[0002] In related technologies, as the proportion of renewable energy power generation gradually increases, the frequency of start-up and shutdown of peak-shaving units also gradually increases. Peak-shaving units are mostly started during peak grid electricity consumption periods, overlapping with peak photovoltaic power generation periods. Furthermore, photovoltaic power contributes little to the purchased electricity of peak-shaving units, and the economic benefits of photovoltaic power generation systems are not fully realized. Summary of the Invention
[0003] This application aims to at least partially address one of the technical problems in the related art.
[0004] In a first aspect, this application proposes a photovoltaic grid-connected access system, comprising: a first photovoltaic grid-connected line, a second photovoltaic grid-connected line, a third photovoltaic grid-connected line, a first peak-shaving unit, a second peak-shaving unit, and a control unit; wherein, the first photovoltaic grid-connected line is connected to a first load interface, and is connected to the first peak-shaving unit via a first switch, and to the second peak-shaving unit via a second switch; the second photovoltaic grid-connected line is connected to a second load interface, and is connected to the first peak-shaving unit via a third switch, and to the second peak-shaving unit via a fourth switch; the third photovoltaic grid-connected line is connected to the first peak-shaving unit via a fifth switch and to the second peak-shaving unit via a sixth switch; the control unit is used to control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the operating status of the second peak-shaving unit.
[0005] In one implementation, the control unit is specifically configured to: in response to the first peak-shaving unit operating and the second peak-shaving unit not operating, control the first switch, the third switch, and the fifth switch to be turned on, and control the second switch, the fourth switch, and the sixth switch to be turned off.
[0006] In one implementation, the control unit is specifically configured to: in response to the first peak-shaving unit operating and the second peak-shaving unit not operating, control the second switch, the fourth switch, and the sixth switch to be turned on, and control the first switch, the third switch, and the fifth switch to be turned off.
[0007] In one implementation, in response to the simultaneous peak shaving of the first peak shaving unit and the second peak shaving unit, the grid connection time interval between the first peak shaving unit and the second peak shaving unit is obtained; in response to the grid connection time interval being less than or equal to a preset duration threshold, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are controlled to be turned on; or, in response to the grid connection time interval being greater than the preset duration threshold, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are controlled to enable the first photovoltaic grid-connected line, the second photovoltaic grid-connected line, and the third photovoltaic grid-connected line to be connected to the peak shaving unit with the earlier grid connection time among the first peak shaving unit and the second peak shaving unit.
[0008] Secondly, this application proposes a control method for a photovoltaic grid-connected system, the method being applied to the system described in the first aspect, the method comprising: controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the operating status of the second peak-shaving unit.
[0009] In one implementation, controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the second peak-shaving unit includes: in response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, controlling the first switch, the third switch, and the fifth switch to be turned on, and controlling the second switch, the fourth switch, and the sixth switch to be turned off.
[0010] In one implementation, controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the second peak-shaving unit includes: in response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, controlling the second switch, the fourth switch, and the sixth switch to be turned on, and controlling the first switch, the third switch, and the fifth switch to be turned off.
[0011] In one implementation, controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating states of the first peak-shaving unit and the second peak-shaving unit includes: in response to the first peak-shaving unit and the second peak-shaving unit simultaneously performing peak shaving, obtaining the grid connection time interval between the first peak-shaving unit and the second peak-shaving unit; in response to the grid connection time interval being less than or equal to a preset duration threshold, controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch to conduct; or, in response to the grid connection time interval being greater than the preset duration threshold, controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch to conduct the first photovoltaic grid-connected line, the second photovoltaic grid-connected line, and the third photovoltaic grid-connected line with the peak-shaving unit among the first peak-shaving unit and the second peak-shaving unit whose grid connection time is earlier.
[0012] Thirdly, this application provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method as described in the second aspect.
[0013] Fourthly, this application proposes a storage medium storing instructions that, when executed on an electronic device, cause the electronic device to perform the method described in the second aspect.
[0014] Fifthly, this application proposes a program product comprising at least one of a program and instructions, wherein when the program or instructions are executed by an electronic device, they implement the steps of the method described in the second aspect.
[0015] The photovoltaic grid-connected system and its control method provided in this application can achieve a photovoltaic power consumption rate.
[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of a photovoltaic grid-connected system provided in an embodiment of this application; Figure 2This is a flowchart illustrating a photovoltaic grid-connected system control method provided in an embodiment of this application; Figure 3 This is a schematic diagram of another photovoltaic grid-connected system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation
[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0019] The photovoltaic grid connection method and apparatus of this application are described below with reference to the accompanying drawings.
[0020] Figure 1 This is a schematic diagram of a photovoltaic grid-connected system method provided in an embodiment of this application. Figure 1 As shown, the system includes: a first photovoltaic grid-connected line 101, a second photovoltaic grid-connected line 102, a third photovoltaic grid-connected line 103, a first peak-shaving unit 104, a second peak-shaving unit 105, and a control unit 106.
[0021] The first photovoltaic grid-connected line 101 is connected to the first load interface 107, and is connected to the first peak-shaving unit 104 via the first switch 108, and to the second peak-shaving unit 105 via the second switch 109; the second photovoltaic grid-connected line 102 is connected to the second load interface 110, and is connected to the first peak-shaving unit 104 via the third switch 111, and to the second peak-shaving unit 105 via the fourth switch 112; the third photovoltaic grid-connected line 103 is connected to the first peak-shaving unit 104 via the fifth switch 113, and to the second peak-shaving unit 105 via the sixth switch 114; the control unit 106 is used to control the first switch 108, the second switch 109, the third switch 111, the fourth switch 112, the fifth switch 113, and the sixth switch 114 based on the operating status of the first peak-shaving unit 104 and the second peak-shaving unit 105.
[0022] It should be noted that the first photovoltaic grid-connected line 101, the second photovoltaic grid-connected line 102, and the third photovoltaic grid-connected line 103 are respectively connected to the corresponding photovoltaic generator sets.
[0023] It should be noted that the first load interface 107 and the second load interface 110 can be connected to the corresponding electrical loads respectively.
[0024] In one implementation, the control unit 106 is specifically configured to: in response to the first peak-shaving unit 104 operating and the second peak-shaving unit 105 not operating, control the first switch 108, the third switch 111 and the fifth switch 113 to be turned on, and control the second switch 109, the fourth switch 112 and the sixth switch 114 to be turned off.
[0025] For example, if only the first peak-shaving unit 104 operates for peak shaving, the first switch 108, the third switch 111, and the fifth switch 113 are turned on at a preset time before the first peak-shaving unit 104 is connected to the grid (e.g., two hours before grid connection), and the second switch 109, the fourth switch 112, and the sixth switch 114 are turned off. The photovoltaic grid-connected lines will then connect to the first peak-shaving unit 104, and the photovoltaic power will directly offset the large amount of external power consumed during the startup phase of the first peak-shaving unit 104.
[0026] In one implementation, the control unit 106 is specifically configured to: in response to the first peak-shaving unit 104 operating and the second peak-shaving unit 105 not operating, control the second switch 109, the fourth switch 112 and the sixth switch 114 to be turned on, and control the first switch 108, the third switch 111 and the fifth switch 113 to be turned off.
[0027] For example, if only the second peak-shaving unit 105 operates for peak shaving, the second switch 109, the fourth switch 112 and the sixth switch 114 are turned on at a preset time before the second peak-shaving unit 105 is connected to the grid (for example, two hours before grid connection), and the first switch 108, the third switch 111 and the fifth switch 113 are turned off. The photovoltaic grid-connected lines will be connected to the second peak-shaving unit 105, and the photovoltaic power will directly offset the large amount of external power consumed during the startup phase of the second peak-shaving unit 105.
[0028] In one implementation, the control unit 106 is specifically configured to: in response to the simultaneous peak shaving of the first peak shaving unit 104 and the second peak shaving unit 105, obtain the grid connection time interval between the first peak shaving unit 104 and the second peak shaving unit 105; in response to the grid connection time interval being less than or equal to a preset duration threshold, control the first switch 108, the second switch 109, the third switch 111, the fourth switch 112, the fifth switch 113, and the sixth switch 114 to conduct; or, in response to the grid connection time interval being greater than the preset duration threshold, control the first switch 108, the second switch 109, the third switch 111, the fourth switch 112, the fifth switch 113, and the sixth switch 114 to connect the first photovoltaic grid-connected line 101, the second photovoltaic grid-connected line 102, and the third photovoltaic grid-connected line 103 to the peak shaving unit among the first peak shaving unit 104 and the second peak shaving unit 105 that has an earlier grid connection time.
[0029] As an example, if the first peak-shaving unit 104 and the second peak-shaving unit 105 operate simultaneously for peak shaving, and the grid connection time interval between the first peak-shaving unit 104 and the second peak-shaving unit 105 is less than or equal to a preset time threshold (e.g., 1 hour), then the first switch 108, the second switch 109, the third switch 111, the fourth switch 112, the fifth switch 113, and the sixth switch 114 are turned on. At this time, the first peak-shaving unit 104 and the second peak-shaving unit 105 will be connected simultaneously from each photovoltaic grid connection line, and the photovoltaic power will directly offset the large amount of external power consumed during the start-up phase of the first peak-shaving unit 104 and the second peak-shaving unit 105.
[0030] As another example, if the first peak-shaving unit 104 and the second peak-shaving unit 105 operate simultaneously for peak shaving, and the grid connection time interval between the first peak-shaving unit 104 and the second peak-shaving unit 105 is less than or equal to a preset time threshold, and the first peak-shaving unit 104 is connected to the grid earlier than the second peak-shaving unit 105, then the control unit 106 controls the first switch 108, the third switch 111 and the fifth switch 113 to be turned on, and controls the second switch 109, the fourth switch 112 and the sixth switch 114 to be turned off. The photovoltaic grid connection lines will be connected to the first peak-shaving unit 104, and the photovoltaic power will directly offset the large amount of external power consumed during the start-up phase of the first peak-shaving unit 104.
[0031] As another example, if the first peak-shaving unit 104 and the second peak-shaving unit 105 operate simultaneously for peak shaving, and the grid connection time interval between the first peak-shaving unit 104 and the second peak-shaving unit 105 is less than or equal to a preset time threshold, and the second peak-shaving unit 105 is connected to the grid earlier than the first peak-shaving unit 104, then the control unit 106 controls the second switch 109, the fourth switch 112 and the sixth switch 114 to be turned on, and controls the first switch 108, the third switch 111 and the fifth switch 113 to be turned off. The photovoltaic grid connection lines will then connect to the second peak-shaving unit 105, and the photovoltaic power will directly offset the large amount of external power consumed during the startup phase of the second peak-shaving unit 105.
[0032] The system implemented in this application embodiment can improve the photovoltaic power consumption rate.
[0033] Please see Figure 2 , Figure 2 This is a flowchart illustrating a photovoltaic grid-connected system control method provided in an embodiment of this application. Figure 2 As shown, the method may include, but is not limited to, the following steps: S201: Control the first switch, second switch, third switch, fourth switch, fifth switch, and sixth switch based on the operating status of the first peak-shaving unit and the second peak-shaving unit.
[0034] In one implementation, the control of the first switch, second switch, third switch, fourth switch, fifth switch, and sixth switch based on the operating states of the first and second peak-shaving units includes: In response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, the first, third, and fifth switches are turned on, and the second, fourth, and sixth switches are turned off.
[0035] In one implementation, the control of the first switch, second switch, third switch, fourth switch, fifth switch, and sixth switch based on the operating states of the first and second peak-shaving units includes: In response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, the second, fourth, and sixth switches are turned on, and the first, third, and fifth switches are turned off.
[0036] The control method described in this application embodiment can improve the photovoltaic power consumption rate.
[0037] It should be noted that the foregoing explanation of the photovoltaic grid-connected access system embodiment also applies to the control method of the photovoltaic grid-connected access system in this embodiment, and will not be repeated here.
[0038] The photovoltaic grid-connected access system and its control method provided in this application are further described below with specific examples: As an example, please see Figure 3 , Figure 3 This is a schematic diagram of another photovoltaic grid-connected system provided in an embodiment of this application. For example... Figure 3 As shown, #4 grid-connected cabinet is equivalent to the aforementioned first photovoltaic grid-connected line, #5 grid-connected cabinet is equivalent to the aforementioned second photovoltaic grid-connected line, #6 grid-connected cabinet is equivalent to the aforementioned third photovoltaic grid-connected line, building A section is equivalent to the electrical load connected to the aforementioned first load interface, building B section is equivalent to the electrical load connected to the aforementioned second load interface, #1 unit is equivalent to the aforementioned first peak-shaving unit, and #2 unit is equivalent to the aforementioned second peak-shaving unit.
[0039] If Unit #1 operates under peak shaving, the #4, #5, #6 photovoltaic switches and the building photovoltaic bus switch will be automatically switched to the left by remote control two hours before grid connection. At this time, the #4, #5, and #6 photovoltaic grid-connected cabinets will be connected to the #1 unit's power system, and the photovoltaic power will directly offset the large amount of purchased power consumed by Unit #1 during the start-up phase.
[0040] If Unit #2 operates under peak shaving, the remote control line automatic switching system will be used to switch the #4, #5, #6 photovoltaic switches and the building photovoltaic bus switch to the right 2 hours before grid connection. At this time, the #4, #5, and #6 photovoltaic grid-connected cabinets will be connected to the #2 unit's plant power system, and the photovoltaic power will directly offset the large amount of purchased power consumed during the start-up phase of Unit #2.
[0041] If Units #1 and #2 are operating in a dual-unit peak-shaving mode, the timing of photovoltaic line switching will be determined based on the specific start-up time. If the grid connection time interval between the two units is less than one hour, photovoltaic line switching will not be performed. If the grid connection time interval between the two units is more than one hour, the photovoltaic line will be switched to the power supply of the unit that was connected to the grid first, so as to offset the purchased power during the high-energy-consuming phase of unit startup as much as possible.
[0042] The system implemented in this application embodiment can improve the photovoltaic power consumption rate.
[0043] It should be noted that the foregoing explanation of the photovoltaic grid-connected access system embodiment also applies to the control method of the photovoltaic grid-connected access system in this embodiment, and will not be repeated here.
[0044] To implement the above embodiments, this application also proposes an electronic device. Please see [link to relevant documentation]. Figure 4 , Figure 4 This is a schematic diagram of the structure of the electronic device provided in an embodiment of this application. For example... Figure 4As shown, the electronic device 400 includes: a processor 401, and a memory 402 communicatively connected to the processor 401; the memory 402 stores computer execution instructions; the processor 401 executes the computer execution instructions stored in the memory to implement the method provided in the foregoing embodiments.
[0045] To implement the above embodiments, this application also proposes a storage medium storing instructions that, when executed on an electronic device, cause the electronic device to perform the methods provided in the foregoing embodiments.
[0046] To implement the above embodiments, this application also proposes a program product, including at least one of a program and instructions, wherein when the program and instructions are executed by an electronic device, they implement the steps of the method provided in the foregoing embodiments.
[0047] It should be noted that the acquisition, transmission, storage, use, and processing of data in this application comply with the relevant provisions of national laws and regulations and do not violate public order and good morals.
[0048] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, data stored, data displayed, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.
[0049] It is worth noting that in the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, they do not mean that the applicant has used or necessarily used the solution.
[0050] In the description of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.
[0051] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0053] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.
[0054] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0055] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0056] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.
[0057] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0058] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. A photovoltaic grid-connected system, characterized in that, The system includes: a first photovoltaic grid-connected line, a second photovoltaic grid-connected line, a third photovoltaic grid-connected line, a first peak-shaving unit, a second peak-shaving unit, and a control unit; wherein, The first photovoltaic grid-connected line is connected to the first load interface, and is connected to the first peak-shaving unit through the first switch, and is connected to the second peak-shaving unit through the second switch; The second photovoltaic grid-connected line is connected to the second load interface, and is connected to the first peak-shaving unit through the third switch, and is connected to the second peak-shaving unit through the fourth switch; The third photovoltaic grid-connected line is connected to the first peak-shaving unit via the fifth switch and to the second peak-shaving unit via the sixth switch; The control unit is used to control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the second peak-shaving unit.
2. The system according to claim 1, characterized in that, The control unit is specifically used for: In response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, the first switch, the third switch, and the fifth switch are controlled to be turned on, and the second switch, the fourth switch, and the sixth switch are controlled to be turned off.
3. The system according to claim 1, characterized in that, The control unit is specifically used for: In response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, the second switch, the fourth switch, and the sixth switch are controlled to be turned on, and the first switch, the third switch, and the fifth switch are controlled to be turned off.
4. The system according to claim 1, characterized in that, The control unit is specifically used for: In response to the simultaneous peak shaving by the first peak shaving unit and the second peak shaving unit, the grid connection time interval between the first peak shaving unit and the second peak shaving unit is obtained; In response to the grid connection time interval being less than or equal to a preset duration threshold, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are controlled to be turned on; or, In response to the grid connection time interval being greater than the preset duration threshold, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are controlled to enable the first photovoltaic grid connection line, the second photovoltaic grid connection line, and the third photovoltaic grid connection line to be connected to the peak shaving unit among the first peak shaving unit and the second peak shaving unit with the earlier grid connection time.
5. A control method for a photovoltaic grid-connected system, characterized in that, The method is applied to the system as described in any one of claims 1-4, and the method comprises: The first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are controlled based on the operating status of the first peak-shaving unit and the second peak-shaving unit.
6. The method according to claim 5, characterized in that, The control of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the second peak-shaving unit includes: In response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, the first switch, the third switch, and the fifth switch are controlled to be turned on, and the second switch, the fourth switch, and the sixth switch are controlled to be turned off.
7. The method according to claim 5, characterized in that, The control of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch based on the operating status of the first peak-shaving unit and the second peak-shaving unit includes: In response to the first peak-shaving unit being in operation and the second peak-shaving unit not being in operation, the second switch, the fourth switch, and the sixth switch are controlled to be turned on, and the first switch, the third switch, and the fifth switch are controlled to be turned off.
8. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method performed by the control unit as described in any one of claims 5-7.
9. A storage medium storing instructions, characterized in that, When the instructions are executed on the electronic device, the electronic device causes the electronic device to perform the method performed by the control unit as described in any one of claims 5-7.
10. A program product comprising at least one of a program and instructions, characterized in that, When at least one of the programs or instructions is executed by an electronic device, it implements the method executed by the control unit in any one of claims 5-7.