A dual-direct-current-bus-based optical storage and charging system and switching control method

Abstract

The application relates to a dual-DC-bus-based light storage and charging system and a switch switching control method. The switch switching control system of the dual-DC-bus-based light storage and charging system comprises an energy management unit, a photovoltaic and energy storage unit, a first DC / DC charging pile, a second DC / DC charging pile, a first energy storage converter and a second energy storage converter. The energy management unit is used for sending a control instruction to the energy storage unit corresponding switch and / or the photovoltaic unit corresponding switch, and the control instruction is used for controlling the energy storage unit corresponding switch and / or the photovoltaic unit corresponding switch to selectively cut into the first DC bus or the second DC bus. Therefore, the dual-bus architecture is established, the independent switch is controlled by the energy management unit, the energy storage unit and / or at least one photovoltaic unit are selectively accessed to different DC buses, and the system reliability is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to a photovoltaic energy storage and charging system based on dual DC buses and a switching control method. Background Technology

[0002] With the rapid development of distributed photovoltaic, electric vehicle charging, and energy storage technologies, integrated photovoltaic-energy storage-charging systems have become an important carrier for comprehensive energy utilization and are widely used in communities, industrial parks, charging stations, and other locations. Currently, most existing photovoltaic-energy storage-charging systems adopt a single DC bus or pure AC bus architecture, which has many technical defects. For example, in a single bus architecture, all photovoltaic units, energy storage units, and charging equipment are connected to the same bus. Once the bus fails, the entire system will be paralyzed, resulting in extremely low reliability. Summary of the Invention

[0003] This application provides a photovoltaic-storage-charging system based on dual DC buses and a switching control method. The system establishes a dual-bus architecture. The energy management unit sends control commands to the corresponding switching switches of the energy storage unit and / or the corresponding switching switches of the photovoltaic unit, respectively, to control the independent switching switches to selectively connect the energy storage unit and / or at least one photovoltaic unit to different first DC buses or second DC buses, so as to form two parallel subsystems that can operate independently, which is beneficial to improving system reliability.

[0004] In a first aspect, embodiments of this application provide a photovoltaic-energy storage-charging system based on dual DC buses. The photovoltaic-energy storage-charging system includes: an energy management unit, a photovoltaic and energy storage unit, a first DC / DC charging pile, a second DC / DC charging pile, a first energy storage converter, and a second energy storage converter. The photovoltaic and energy storage unit includes an energy storage unit and multiple photovoltaic units. The output terminal of the energy storage unit and the output terminal of each photovoltaic unit are independently connected to a switching switch. The switching switch is used to switch the corresponding energy storage unit or photovoltaic unit to the first DC bus to connect to the first terminal of the first energy storage converter and / or the input terminal of the first DC / DC charging pile. Alternatively, the switching switch is used to switch the corresponding energy storage unit or photovoltaic unit to the second DC bus to connect to the first terminal of the second energy storage converter and / or the input terminal of the second DC / DC charging pile. The energy management unit establishes communication connections with the photovoltaic and energy storage units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, and the second energy storage converter, respectively, and is used to send control commands to the corresponding switching switches of the energy storage units and / or the corresponding switching switches of the photovoltaic units. The control commands are used to control the corresponding switching switches of the energy storage units and / or the corresponding switching switches of the photovoltaic units to selectively switch to the first DC bus or the second DC bus.

[0005] In one possible example, the photovoltaic energy storage and charging system further includes: a first DC / DC charging pile and a second DC / DC charging pile; wherein the first DC / DC charging pile is paired with the first energy storage converter and connected to the first DC bus; and the second DC / DC charging pile is paired with the second energy storage converter and connected to the second DC bus.

[0006] In one possible example, the control command includes a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus, and the second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

[0007] In one possible example, the energy management unit is also used for: If a fault is detected in the first DC bus, the first energy storage converter, or the first DC / DC charging pile, the second control command is sent to the switching switch corresponding to the energy storage unit connected to the first DC bus and / or the switching switch corresponding to the photovoltaic unit. If a fault is detected in the second DC bus, the second energy storage converter, or the second DC / DC charging pile, the first control command is sent to the switching switch corresponding to the energy storage unit connected to the second DC bus and / or the switching switch corresponding to the photovoltaic unit.

[0008] In one possible example, the photovoltaic energy storage and charging system further includes: a power grid; the second terminals of the first energy storage converter and the second energy storage converter are respectively electrically connected to the power grid.

[0009] Secondly, embodiments of this application provide a switching control method for a photovoltaic-storage-charging system based on a dual DC bus, applied to the energy management unit of the aforementioned photovoltaic-storage-charging system based on a dual DC bus; the method includes: Obtain the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus respectively; A power allocation strategy is determined based on the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively. According to the power allocation strategy, control commands are sent to the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit, wherein the control commands are used to control the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

[0010] In one possible example, the control command includes a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus, and the second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

[0011] In one possible example, sending control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit according to the power allocation strategy includes: If the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile both meet the first charging power demand, then the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile are compared. If the charging power requirement of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then a first minimum number of photovoltaic units is determined to meet the charging power requirement of the first DC / DC charging pile; at least one first photovoltaic unit that meets the first minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a first control command is sent to the corresponding switch of each first photovoltaic unit, the first control command being used to control the corresponding switch of the first photovoltaic unit to switch onto the first DC bus; and a second control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the first photovoltaic unit, the second control command being used to control the corresponding switches of the other photovoltaic units to switch onto the second DC bus; and a second control command is sent to the corresponding switch of the energy storage unit, the second control command being used to control the corresponding switch of the energy storage unit to switch onto the second DC bus. If the charging power demand of the first DC / DC charging pile is greater than the charging power demand of the second DC / DC charging pile, then a second minimum number of photovoltaic units is determined to meet the charging power demand of the second DC / DC charging pile; at least one second photovoltaic unit that meets the second minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a second control command is sent to the corresponding switch of each second photovoltaic unit, the second control command being used to control the corresponding switch of the second photovoltaic unit to switch onto the second DC bus; and a first control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the second photovoltaic unit, the first control command being used to control the corresponding switches of the other photovoltaic units to switch onto the first DC bus; and a first control command is sent to the corresponding switch of the energy storage unit, the first control command being used to control the corresponding switch of the energy storage unit to switch onto the first DC bus.

[0012] Thirdly, embodiments of this application provide a switching control device for a photovoltaic-storage-charging system based on a dual DC bus, applied to the energy management unit of the aforementioned photovoltaic-storage-charging system based on a dual DC bus, the device comprising: The acquisition unit is used to acquire the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively. The determining unit is used to determine a power allocation strategy based on the operating parameters corresponding to the energy storage unit, each of the photovoltaic units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively. The transmitting unit is configured to send control commands to the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit according to the power allocation strategy, wherein the control commands are used to control the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

[0013] Fourthly, embodiments of this application provide an electronic device applied to an energy management unit, including a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor; when the processor executes the one or more programs stored in the memory, the processor performs some or all of the steps described in any method of the second aspect of embodiments of this application.

[0014] Fifthly, embodiments of this application provide a computer-readable storage medium storing a computer program, which is executed by a processor of some or all of the steps described in any method of the second aspect of embodiments of this application.

[0015] Implementing the embodiments of this application has the following beneficial effects: As can be seen, this application discloses a photovoltaic-energy storage-charging system and a switching control method based on a dual DC bus. The system includes an energy management unit, a photovoltaic and energy storage unit, a first DC / DC charging pile, a second DC / DC charging pile, a first energy storage converter, and a second energy storage converter. The photovoltaic and energy storage unit includes an energy storage unit and multiple photovoltaic units. The output terminal of the energy storage unit and the output terminal of each photovoltaic unit are independently connected to a switching switch. The switching switch is used to switch the corresponding energy storage unit or photovoltaic unit into the first DC bus to connect to the first terminal of the first energy storage converter and / or the input terminal of the first DC / DC charging pile. Alternatively, a switching switch is used to connect the corresponding energy storage unit or photovoltaic unit to the second DC bus to connect to the first terminal of the second energy storage converter and / or the input terminal of the second DC / DC charging pile. The energy management unit establishes communication connections with the photovoltaic and energy storage units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, and the second energy storage converter, respectively. It sends control commands to the switching switches corresponding to the energy storage units and / or the photovoltaic units, respectively, to control the switching switches to selectively connect to the first DC bus or the second DC bus. Therefore, by establishing a dual-bus architecture, and by sending control commands from the energy management unit to the switching switches corresponding to the energy storage units and / or the photovoltaic units, the independent switching switches can selectively connect the energy storage units and / or at least one photovoltaic unit to different first DC buses or second DC buses, forming two parallel, independently operating subsystems, which improves system reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1A An architecture diagram of a photovoltaic energy storage and charging system based on dual DC buses is provided for an embodiment of this application; Figure 1B Another architecture diagram of a photovoltaic energy storage and charging system based on dual DC buses provided in this application embodiment; Figure 1CThis application provides an embodiment of another photovoltaic energy storage and charging system architecture based on dual DC buses. Figure 2 This is a flowchart of a switching control method for a photovoltaic energy storage and charging system based on dual DC buses, provided in an embodiment of this application. Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application; Figure 4 This is a block diagram of the functional modules of a switching control device for a photovoltaic energy storage and charging system based on a dual DC bus, provided in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0020] The terms "one embodiment" or "some embodiments" used in this application mean that one or more embodiments of this application include the specific features, structures, or characteristics described in that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this application do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. Furthermore, the terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0021] In the embodiments of this application, "at least one item" or its similar expression refers to any combination of these items, including any combination of a single item or a plurality of items. "One or more" means one or more, while "multiple" means two or more. For example, "at least one item" of a, b, or c can represent the following seven cases: a, b, c; a and b; a and c; b and c; a, b, and c. Each of a, b, and c can be an element or a set containing one or more elements.

[0022] In this application, the term "connection" refers to various connection methods, such as direct connection or indirect connection, to achieve communication between devices. This application does not impose any limitations on this.

[0023] To facilitate understanding of the technical solution of this application, the relevant technologies involved in this application will be introduced first.

[0024] Please see Figure 1A , Figure 1A This is an architecture diagram of a photovoltaic, energy storage and charging system based on a dual DC bus provided in an embodiment of this application. The photovoltaic, energy storage and charging system 100 based on a dual DC bus includes: an energy management unit 110, a photovoltaic and energy storage unit 120, a first DC / DC charging pile 1301, a second DC / DC charging pile 1302, a first energy storage converter 1401 and a second energy storage converter 1402.

[0025] The photovoltaic and energy storage unit 120 includes an energy storage unit 1201 and multiple photovoltaic units 1202. The output terminals of the energy storage unit 1201 and each of the photovoltaic units 1202 are independently connected to a switching switch. The switching switch is used to connect the corresponding energy storage unit 1201 or photovoltaic unit 1202 to the first DC bus to connect to the first terminal of the first energy storage converter 1401 and / or the input terminal of the first DC / DC charging pile 1301. Alternatively, the switching switch is used to connect the corresponding energy storage unit 1201 or photovoltaic unit 1202 to the second DC bus to connect to the first terminal of the second energy storage converter 1402 and / or the input terminal of the second DC / DC charging pile 1302. The energy management unit 110 establishes communication connections with the photovoltaic and energy storage unit 120, the first DC / DC charging pile 1301, the second DC / DC charging pile 1302, the first energy storage converter 1401, and the second energy storage converter 1402, respectively, and sends control commands to the corresponding switching switch of the energy storage unit 1201 and / or the corresponding switching switch of the photovoltaic unit 1202. The control commands are used to control the corresponding switching switch of the energy storage unit 1201 and / or the corresponding switching switch of the photovoltaic unit 1202 to selectively switch to the first DC bus or the second DC bus.

[0026] The energy management unit 110 establishes communication connections with the energy storage unit 1201 and its corresponding switch, each photovoltaic unit 1202 and its corresponding switch, the first DC / DC charging pile 1301, the second DC / DC charging pile 1302, the first energy storage converter 1401, and the second energy storage converter 1402, respectively (e.g., Figure 1A (Drawn with dashed lines in the middle), enabling interactive transmission of control commands. It is also used to collect the operating parameters of the above-mentioned devices or units in real time, and can determine the optimal operating mode of the current system in combination with preset system optimization goals (high reliability, high energy utilization, operating mode adaptability, etc.), and determine the DC bus (first DC bus or second DC bus) that each photovoltaic unit 1202 and / or energy storage unit 1201 should be connected to.

[0027] The above-mentioned operating modes may include at least one of the following: photovoltaic priority charging energy storage mode, energy storage supplement / photovoltaic power supply mode, power mutual assistance operation mode, energy storage supplement / energy storage converter power supply mode, and redundant backup operation mode, which are not limited here.

[0028] The photovoltaic and energy storage unit 120 includes an energy storage unit 1201 and a multi-photovoltaic unit 1202 (e.g., ...). Figure 1A Only a portion is shown in the figure. The ellipsis in the figure is used to indicate at least one other photovoltaic unit 1202 and the corresponding switching switch of the photovoltaic unit 1202. The specific number is not limited here. The system is equipped with an independent switching switch for each photovoltaic unit 1202 and energy storage unit 1201. It can receive control commands sent by the energy management unit 110 to control its corresponding switching switch to switch to different DC buses (first DC bus or second DC bus).

[0029] The energy management unit 110 can independently control the voltage and power of the two DC buses. For example, when at least one photovoltaic unit 1202 generates a large amount of electricity, it can be flexibly allocated to the first DC bus and / or the second DC bus; or it can prioritize supplying the load (the first DC / DC charging pile 1301 and / or the second DC / DC charging pile 1302), and store the excess electricity in the energy storage unit 1201.

[0030] The first energy storage converter 1401 and / or the second energy storage converter 1402 and / or the first DC / DC charging pile 1301 and / or the second DC / DC charging pile 1302 and / or the photovoltaic unit 1202 and / or the energy storage unit 1201 are used to respond to the scheduling instructions corresponding to the power allocation strategy sent by the energy management unit 110 and complete the coordinated operation under different charging power requirements.

[0031] The first end of the first energy storage converter 1401 is connected to the output end of the energy storage unit 1201 and the output end of the multi-channel photovoltaic unit 1202, and the first end of the second energy storage converter 1402 is connected to the output end of the energy storage unit 1201 and the output end of the multi-channel photovoltaic unit 1202.

[0032] The energy storage unit, including an energy storage battery, is used to discharge to the first DC bus or the second DC bus under different charging demand scenarios.

[0033] The first DC / DC charging pile 1301 and / or the second DC / DC charging pile 1302 are used to provide charging services for charging equipment such as electric vehicles.

[0034] It should be noted that the above-described photovoltaic-storage-charging system based on dual DC buses is suitable for modular capacity expansion; if it is necessary to add photovoltaic unit 1202 and / or energy storage unit 1201, it can be done as follows: Figure 1A Based on the aforementioned photovoltaic energy storage and charging system with dual DC buses, it can be directly connected in parallel to an idle DC bus or a new DC bus branch can be added. The specific system design is not limited here.

[0035] As can be seen, the photovoltaic-energy storage-charging system based on a dual DC bus described in this application includes: an energy management unit 110, a photovoltaic and energy storage unit 120, a first DC / DC charging pile 1301, a second DC / DC charging pile 1302, a first energy storage converter 1401, and a second energy storage converter 1402; the photovoltaic and energy storage unit 120 includes an energy storage unit 1201 and multiple photovoltaic units 1202, and the output terminal of the energy storage unit 1201 and the output terminal of each photovoltaic unit 1202 are independently connected to a switching switch; the switching switch is used to switch the corresponding energy storage unit 1201 or photovoltaic unit 1202 into the first DC bus to connect to the first terminal of the first energy storage converter 1401 and / or the input terminal of the first DC / DC charging pile 1301, or ... into the first DC bus to connect to the first terminal of the first energy storage converter 1401 and / or the input terminal of the first DC / DC charging pile 1301, or the switching switch is used to switch the corresponding energy storage unit 1202 into the first DC bus to connect to the first terminal of the first energy storage converter 1401 and / or the input terminal of the first DC / DC charging pile 1301, or the switching switch is used to switch the corresponding energy storage unit 1202 into the first DC bus to connect to the first terminal of the first energy storage converter 1401 and / or the input terminal of the first DC / DC charging pile 1301, or the switching switch is used to switch the corresponding energy storage unit 1202 into the first DC bus to connect to the first terminal of the first DC / DC charging The energy unit 1201 or photovoltaic unit 1202 is connected to the second DC bus to connect to the first terminal of the second energy storage converter 1402 and / or the input terminal of the second DC / DC charging pile 1302; the energy management unit 110 establishes communication connections with the photovoltaic and energy storage unit 120, the first DC / DC charging pile 1301, the second DC / DC charging pile 1302, the first energy storage converter 1401 and the second energy storage converter 1402, respectively, and sends control commands to the corresponding switching switch of the energy storage unit 1201 and / or the corresponding switching switch of the photovoltaic unit 1202. The control commands are used to control the corresponding switching switch of the energy storage unit 1201 and / or the corresponding switching switch of the photovoltaic unit 1202 to selectively connect to the first DC bus or the second DC bus. Therefore, a dual-bus architecture can be established. The energy management unit 110 sends control commands to the corresponding switching switches of the energy storage unit 1201 and / or the photovoltaic unit 1202, respectively, to control the independent switching switches to selectively connect the energy storage unit 1201 and / or at least one photovoltaic unit 1202 to different first DC buses or second DC buses, so as to form two parallel subsystems that can operate independently, which is beneficial to improving system reliability.

[0036] In one possible example, the first DC / DC charging pile 1301 is paired with the first energy storage converter 1401 and connected to the first DC bus; the second DC / DC charging pile 1302 is paired with the second energy storage converter 1402 and connected to the second DC bus.

[0037] Among them, such as Figure 1A As shown, the energy storage battery can be directly connected to the first DC bus or the second DC bus, and is connected to the same node of the first DC bus or the second DC bus along with the first terminal of the energy storage converter and the input terminal of the first DC / DC charging pile 1301. No additional DC / DC conversion stage is required, which simplifies the architecture of the DC microgrid system and reduces energy conversion losses.

[0038] In one possible example, the control command includes a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit 1201 or the switching switch corresponding to the photovoltaic unit 1202 to switch to the first DC bus. The second control command is used to control the switching switch corresponding to the energy storage unit 1201 or the switching switch corresponding to the photovoltaic unit 1202 to switch to the second DC bus.

[0039] The system divides control commands into first control commands and second control commands to distinguish their different uses, namely connecting to the first DC bus or connecting to the second DC bus. This enables precise differentiation and independent control of different DC bus connection operations, improving the system's control accuracy, operational clarity, and operational reliability, while simplifying the control logic and facilitating system management and maintenance.

[0040] In one possible example, the energy management unit 110 is further configured to: if a fault is detected in the first DC bus, the first energy storage converter 1401, or the first DC / DC charging pile 1301, then send the second control command to the switching switch corresponding to the energy storage unit 1201 and / or the switching switch corresponding to the photovoltaic unit 1202 that is connected to the first DC bus. If a fault is detected in the second DC bus, the second energy storage converter 1402, or the second DC / DC charging pile 1302, the first control command is sent to the switching switch corresponding to the energy storage unit 1201 and / or the switching switch corresponding to the photovoltaic unit 1202 connected to the second DC bus.

[0041] Specifically, when any device, unit, or DC bus fails, the system sends a control command to the corresponding switching switch and / or photovoltaic unit 1202 connected to the DC bus on the faulty side via a first control command or a second control command. This command switches the energy storage unit 1201 and / or photovoltaic unit 1202 associated with the DC bus on that side to the normally operating DC bus. The system also controls the energy storage converter and / or charging pile on the faulty side to shut down.

[0042] For example, if a fault is detected in the second DC bus, the switching switch of the energy storage unit 1201 connected to the second DC bus and / or the switching switch of the photovoltaic unit 1202 will be switched to the first DC bus, and the second energy storage converter 1402 and / or the second DC / DC charging pile 1302 will be shut down.

[0043] This example corresponds to the redundant backup operating mode in the operating modes.

[0044] As can be seen, this example implements an automatic fault switching and redundancy protection mechanism for the system. When a fault is detected in any DC bus or its corresponding energy storage converter or DC / DC charging pile, the energy management unit can intelligently switch the energy storage unit and photovoltaic unit to the other DC bus that is operating normally. This enables automatic switching when a fault occurs, avoiding complete system failure and improving system reliability. Furthermore, the dual-bus redundant backup design ensures uninterrupted charging service and guarantees power supply continuity.

[0045] Optionally, in the dual-bus architecture, the energy storage unit 1201 or at least one photovoltaic unit 1202 can be switched to different DC buses (first DC bus or second DC bus) through the corresponding switching switch of the energy storage unit 1201 and the corresponding switching switch of each photovoltaic unit 1202, so as to split the entire system into two parallel subsystems that serve as backups for each other, namely the first subsystem and the second subsystem; the photovoltaic unit 1202 or the energy storage unit 1201 exists in either subsystem.

[0046] For example, such as Figure 1B The diagram shows another architecture of a photovoltaic-storage-charging system based on dual DC buses. The first subsystem includes a first energy storage converter 1401, a first DC / DC charging pile 1301, a photovoltaic unit 1202 and its corresponding switch, and an energy storage unit 1201. The second subsystem includes a second energy storage converter 1402, a second DC / DC charging pile 1302, two photovoltaic units 1202 and their corresponding switches. The specific splitting method is not limited here.

[0047] It should be noted that, Figure 1B Only the key equipment or units are shown. Figure 1B The energy management unit 110 (not shown) and its connection to other devices or units are as follows: Figure 1A The same applies here, so I will not elaborate further.

[0048] Specifically, when the energy management unit 110 detects a fault in any device in the first subsystem (the first DC bus, the first energy storage converter 1401, or the first DC / DC charging pile 1301), it can control all photovoltaic units 1202 and / or energy storage units 1201 in the first subsystem to quickly switch to the second subsystem, i.e., switch to the second DC bus in the second subsystem. Conversely, when the energy management unit 110 detects a fault in any device in the second subsystem (the second DC bus, the second energy storage converter 1402, or the second DC / DC charging pile 1302), it can control all photovoltaic units 1202 and / or energy storage units 1201 to quickly switch to the first subsystem, i.e., switch to the first DC bus in the first subsystem. This gives the entire system reconfigurability to avoid system-wide failure, forming mutually backup subsystems, which is beneficial to improving system operational reliability and continuity, and to improving system operational fault tolerance.

[0049] In one possible example, the photovoltaic energy storage and charging system further includes: a power grid 150; the second terminal of the first energy storage converter 1401 and the second terminal of the second energy storage converter 1402 are respectively electrically connected to the power grid.

[0050] Among them, such as Figure 1C The diagram shown is an architecture diagram of another photovoltaic-storage-charging system based on dual DC buses, and... Figure 1A Similarly, the photovoltaic energy storage and charging system 100 based on dual DC buses also includes a power grid 150, wherein the second end of the first energy storage converter 1401 is bidirectionally electrically connected to the power grid 150, and the second end of the second energy storage converter 1402 is bidirectionally electrically connected to the power grid 150.

[0051] It should be noted that the above Figure 1A The dual DC bus photovoltaic-storage-charging system shown is an off-grid mode. The system relies on multiple internal photovoltaic units 1202 to generate electricity and energy storage units 1201 to discharge, or to maintain the operation of the system through internal energy exchange via the first DC / DC charging pile 1301 or the second DC / DC charging pile 1302. Figure 1C The photovoltaic-storage-charging system with dual DC buses shown is in grid-connected mode, which can achieve... Figure 1A In addition to the functions related to the Chinese system, Figure 1C The first energy storage converter 1401 and the second energy storage converter 1402 are both bidirectionally connected to the power grid, indicating that the photovoltaic energy storage and charging system with dual DC bus can also exchange energy with the external power grid. For example, the system can obtain power from the grid through the first energy storage converter 1401 or the second energy storage converter 1402 to supply energy, or it can send the excess photovoltaic power obtained by multiple photovoltaic units 1202 to the power grid through the first energy storage converter 1401 or the second energy storage converter 1402 to achieve energy exchange.

[0052] Of course, the above Figure 1A and / or Figure 1C In the photovoltaic-storage-charging system based on dual DC buses shown, when the photovoltaic power obtained by the multiple photovoltaic units 1202 is sufficient, after charging the first DC / DC charging pile 1301 or the second DC / DC charging pile 1302, the remaining photovoltaic power can also be used to charge the energy storage unit 1201.

[0053] For example, in one implementation, such as Figure 1C The photovoltaic-storage-charging system based on dual DC buses shown is in grid-connected mode. When the grid 150 suddenly loses power, the energy management unit 110 will control the system or the system itself will automatically and quickly disconnect from the grid 150 to enter a state of emergency. Figure 1A In the off-grid mode shown, the energy storage unit 1201 continues to support the voltage of the first DC bus and the second DC bus, ensuring that the first DC / DC charging pile 1301 and / or the second DC / DC charging pile 1302 and other loads are uninterrupted.

[0054] The first energy storage converter 1401 is used to convert the AC power from the grid 150 into DC power in rectification mode, and to supply power to the first DC / DC charging pile 1301 or charge the energy storage unit 1201 through the first DC bus; in inverter mode, it converts the DC power output from the energy storage unit 1201 into AC power and feeds it back to the grid 150 to adapt to the power demand under different power consumption periods and different charging demand scenarios.

[0055] The second energy storage converter 1402 is used to convert the AC power from the grid 150 into DC power in rectification mode, and to supply power to the second DC / DC charging pile 1302 or charge the energy storage unit 1201 through the second DC bus; in inverter mode, it converts the DC power output from the energy storage unit 1201 into AC power and feeds it back to the grid 150 to adapt to the power demand under different power consumption periods and different charging demand scenarios.

[0056] Please see Figure 2 , Figure 2 This is a flowchart illustrating a switching control method for a photovoltaic-storage-charging system based on a dual DC bus, as provided in an embodiment of this application. It is applied to systems such as... Figure 1A and / or Figure 1C The energy management unit 110 in the photovoltaic energy storage and charging system 100 based on dual DC buses shown includes the following steps in its method: Step S201: Obtain the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively.

[0057] Step S202: Determine the power allocation strategy based on the operating parameters corresponding to the energy storage unit, each of the photovoltaic units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively.

[0058] Step S203: According to the power allocation strategy, send control commands to the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit, wherein the control commands are used to control the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

[0059] The power allocation strategy is used to schedule the energy storage unit and each photovoltaic unit to the first DC bus or the second DC bus in different operating modes to achieve optimal energy allocation; and / or to schedule the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, and the second energy storage converter to complete the coordinated operation under different charging power requirements.

[0060] The above-mentioned operating modes may include at least one of the following: photovoltaic priority charging energy storage mode, energy storage supplement / photovoltaic power supply mode, power mutual assistance operation mode, energy storage supplement / energy storage converter power supply mode, and redundant backup operation mode, which are not limited here.

[0061] The operating parameters of the energy storage unit include at least one of the following: remaining power and charging / discharging power; the operating parameters of the photovoltaic unit include real-time output power; the operating parameters of the first DC / DC charging pile or the second DC / DC charging pile include real-time load; the operating parameters of the first DC bus or the second DC bus include voltage; the operating parameters of the first energy storage converter include first output power, and the operating parameters of the second energy storage converter include second output power.

[0062] For example, the real-time output power of the photovoltaic unit ranges from 0 to 60 kW / channel; the first and second output powers of the first and second energy storage converters, respectively, range from 0 to 120 kW; the real-time load range of the first and second DC / DC charging piles is 0 to 480 kW / unit; the voltage of the first and second DC buses is stable at around 750V, and the operating parameters of the first or second DC bus also include current and power status; when the system includes the power grid, the voltage, frequency, and other parameters of the grid side corresponding to the first and second energy storage converters can also be collected.

[0063] For example, such as Figure 1A or Figure 1CThe photovoltaic energy storage and charging system shown is based on dual DC buses. When one DC bus (such as the first DC bus) is overloaded, for example, the first DC / DC charging pile 1301 has a large charging power requirement, while the other DC bus (such as the second DC bus) is under lighter load, for example, the second DC / DC charging pile 1302 has a smaller charging power requirement, the system can balance the power demand on both sides through the energy storage converter and the switching control method for the switching switch described in this application to prevent unilateral overload.

[0064] As can be seen, the switching control method for a photovoltaic-storage-charging system based on a dual DC bus described in this application embodiment obtains the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively; determines a power allocation strategy based on the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively; and sends control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit, respectively, according to the power allocation strategy. The control commands are used to control the switching switches corresponding to the energy storage unit and / or the photovoltaic unit to selectively switch to the first DC bus or the second DC bus. Therefore, by monitoring the operating parameters of energy storage units, photovoltaic units, DC / DC charging piles, energy storage converters, and DC buses in real time, the resource allocation can be dynamically adjusted according to changes in operating parameters, and the switching operation of the switching switch can be dynamically controlled. This allows the system to adapt to charging needs under different operating modes and intelligently formulate optimal power allocation strategies for precise power allocation, which is beneficial to improving the overall energy efficiency of the system.

[0065] In one possible example, the control command includes a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus, and the second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

[0066] For relevant descriptions in this example, please refer to: Figures 1A-1C The specific implementation details are not elaborated here.

[0067] In one possible example, sending control commands to the corresponding switching switch of the energy storage unit and / or the corresponding switching switch of the photovoltaic unit according to the power allocation strategy includes the following steps: if the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile both meet the first charging power demand, then compare the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile. If the charging power requirement of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then a first minimum number of photovoltaic units is determined to meet the charging power requirement of the first DC / DC charging pile; at least one first photovoltaic unit that meets the first minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a first control command is sent to the corresponding switch of each first photovoltaic unit, the first control command being used to control the corresponding switch of the first photovoltaic unit to switch onto the first DC bus; and a second control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the first photovoltaic unit, the second control command being used to control the corresponding switches of the other photovoltaic units to switch onto the second DC bus; and a second control command is sent to the corresponding switch of the energy storage unit, the second control command being used to control the corresponding switch of the energy storage unit to switch onto the second DC bus. If the charging power demand of the first DC / DC charging pile is greater than the charging power demand of the second DC / DC charging pile, then a second minimum number of photovoltaic units is determined to meet the charging power demand of the second DC / DC charging pile; at least one second photovoltaic unit that meets the second minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a second control command is sent to the corresponding switch of each second photovoltaic unit, the second control command being used to control the corresponding switch of the second photovoltaic unit to switch onto the second DC bus; and a first control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the second photovoltaic unit, the first control command being used to control the corresponding switches of the other photovoltaic units to switch onto the first DC bus; and a first control command is sent to the corresponding switch of the energy storage unit, the first control command being used to control the corresponding switch of the energy storage unit to switch onto the first DC bus.

[0068] In this example, when photovoltaic power generation is sufficient, the energy management unit can obtain the operating parameters corresponding to the first DC / DC charging pile and the second DC / DC charging pile, such as real-time load, and determine the charging demand of the first DC / DC charging pile and the second DC / DC charging pile corresponding to the first DC bus and the second DC bus, respectively.

[0069] Specifically, when the energy management unit determines that the total photovoltaic output is greater than or equal to the first preset photovoltaic parameter (e.g., it can be set to 180kW), that is, when photovoltaic power generation is sufficient, and the total load of the first DC / DC charging pile or the second DC / DC charging pile is small, for example, less than or equal to the first preset load parameter (e.g., it can be set to 150kW), it determines that the charging power demand of the first DC / DC charging pile meets the first charging power demand, or the charging power demand of the second DC / DC charging pile meets the first charging power demand. At this time, the photovoltaic priority charging energy storage mode described in this example can be selected as the optimal operating mode, and the power allocation strategy corresponding to the photovoltaic priority charging energy storage mode can be obtained. The switching on or off of the corresponding switching switches of the photovoltaic unit and / or energy storage unit can be adjusted according to the power allocation strategy.

[0070] In this example, if the system includes a power grid, for any of the above situations, after meeting the charging power demand of the DC / DC charging piles in the corresponding DC bus, the remaining power of other photovoltaic units can be used to charge the energy storage unit, and finally the excess photovoltaic power can be generated back to the power grid through the corresponding energy storage converter.

[0071] For example, if the charging power demand of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then Table 1 below shows the status operation table of each unit or device in a photovoltaic energy storage and charging system based on dual DC buses. As shown in Table 1 below, if the photovoltaic and energy storage unit includes 6 photovoltaic units and one energy storage unit; the energy management unit can select one first photovoltaic unit (such as photovoltaic unit A in Table 1) from the 6 photovoltaic units, with a first minimum number of photovoltaic units of 1, and send a first control command to the corresponding switch of the first photovoltaic unit. The first control command is used to control the corresponding switch of the first photovoltaic unit to switch to the first DC bus; and send a second control command to the corresponding switches of the other photovoltaic units (such as photovoltaic units B, C, D, E and F in Table 1) in the 6 photovoltaic units, except for photovoltaic unit A. The second control command is used to control the corresponding switches of photovoltaic units B, C, D, E and F to switch to the second DC bus; and send a second control command to the corresponding switch of the energy storage unit. The second control command is used to control the corresponding switch of the energy storage unit to switch to the second DC bus.

[0072] Where α represents the photovoltaic unit or energy storage unit connected to the first DC bus, and β represents the photovoltaic unit and energy storage unit connected to the second DC bus; the numerical value represents the connected power; when the power value of the energy storage unit is positive, it is in the charging state, and when it is negative, it is in the discharging state. When the power value of the first or second energy storage converter is positive, it is in inverter mode; conversely, when it is negative, it is in rectification mode.

[0073] For example, if photovoltaic unit A in Table 1 corresponds to α40, it means that photovoltaic unit A is connected to the first DC bus and is in a charging state with a charging power of 40kW.

[0074] Table 1 Status and Operation Table of Each Unit or Device in the Photovoltaic-Storage-Charging System Based on Dual DC Bus

[0075] It should be noted that the data in Table 1 above are only examples, and the specific values ​​can be determined according to the actual situation, and are not limited here; for the case where the charging power requirement of the first DC / DC charging pile is greater than that of the second DC / DC charging pile, the specific implementation method is the same as that in the above embodiment, and will not be repeated here.

[0076] As can be seen, in this example, under the dual DC bus architecture and the photovoltaic-priority charging and energy storage mode, the energy management unit dynamically allocates the access strategies of photovoltaic units and energy storage units by comparing the power demands of the two charging piles. Thus, prioritizing the use of photovoltaic power generation to meet the charging pile demands maximizes photovoltaic utilization. Furthermore, precise configuration based on the minimum number of photovoltaic units avoids resource waste. After meeting the charging demand, the remaining photovoltaic power can be used to charge the energy storage units, further improving energy utilization efficiency. Finally, the "photovoltaic priority" strategy helps reduce grid dependence, lower operating costs, and enhances the power supply guarantee capability and operational economy of the photovoltaic-energy storage-charging system under various operating conditions.

[0077] In one possible example, sending control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit according to the power allocation strategy includes the following steps: If the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile both meet the second charging power demand, then the power is evenly distributed among multiple photovoltaic units to obtain at least one first photovoltaic unit and at least one second photovoltaic unit; a first control command is sent to the corresponding switch of each first photovoltaic unit, the first control command being used to control the corresponding switch of the first photovoltaic unit to switch to the first DC bus; and a second control command is sent to the corresponding switch of each second photovoltaic unit, the second control command being used to control the corresponding switch of the second photovoltaic unit to switch to the second DC bus. Compare the charging power requirements of the first DC / DC charging pile with the charging power requirements of the second DC / DC charging pile; If the charging power demand of the first DC / DC charging pile is greater than the charging power demand of the second DC / DC charging pile, a first control command is sent to the corresponding switching switch of the energy storage unit. The first control command is used to control the switching switch of the energy storage unit to switch to the first DC bus and adjust the charging and discharging state of the energy storage unit to the discharging state. If the charging power demand of the first DC / DC charging pile is less than that of the second DC / DC charging pile, a second control command is sent to the corresponding switching switch of the energy storage unit. The second control command is used to control the switching switch of the energy storage unit to switch to the second DC bus and adjust the charging and discharging state of the energy storage unit to the discharging state.

[0078] The number of photovoltaic units in the first minimum and / or second minimum photovoltaic units can be set by the system or the unit itself, and is not limited here.

[0079] In this example, when photovoltaic power generation is insufficient, the energy management unit can obtain the operating parameters corresponding to the first DC / DC charging pile and the second DC / DC charging pile, such as real-time load, and determine the charging demand of the first DC / DC charging pile and the second DC / DC charging pile corresponding to the first DC bus and the second DC bus, respectively.

[0080] Specifically, when the energy management unit determines that the total photovoltaic output is less than or equal to the second preset photovoltaic parameter (e.g., it can be set to 120kW), i.e., the photovoltaic power generation is insufficient, and the total load of the first DC / DC charging pile or the second DC / DC charging pile is large, for example, greater than the second preset load parameter (e.g., it can be set to 300kW), it determines that the charging power demand of the first DC / DC charging pile meets the second charging power demand, or the charging power demand of the second DC / DC charging pile meets the second charging power demand. At this time, the energy storage supplement / photovoltaic power supply mode described in this example is selected as the optimal operating mode, and the power allocation strategy corresponding to the energy storage supplement / photovoltaic power supply mode is obtained. The switching on or off of the corresponding switching switches of the photovoltaic unit and / or energy storage unit are adjusted according to the power allocation strategy.

[0081] The second preset photovoltaic parameter differs from the first preset photovoltaic parameter, and the first preset photovoltaic parameter can be set to be greater than the second preset photovoltaic parameter. Similarly, the first preset load parameter differs from the second preset load parameter, and the second preset load parameter can be set to be greater than the first preset load parameter.

[0082] For example, in this case, as shown in Table 2 below, is a status operation table of each unit or device in a photovoltaic energy storage and charging system based on dual DC buses. As shown in Table 2 below, if the photovoltaic and energy storage unit includes 6 photovoltaic units and one energy storage unit; the energy management unit divides multiple photovoltaic units equally according to the number of DC buses, so that the number of photovoltaic units in each DC bus is the same. Obviously, this embodiment includes two DC buses, a first DC bus and a second DC bus. Therefore, these 6 photovoltaic units can be evenly divided into two categories, resulting in 3 first photovoltaic units (such as photovoltaic unit A, photovoltaic unit B and photovoltaic unit C in Table 2) and 3 second photovoltaic units (such as photovoltaic unit D, photovoltaic unit E and photovoltaic unit F in Table 2); a first control command is sent to the switching switches corresponding to photovoltaic unit A, photovoltaic unit B and photovoltaic unit C respectively, the first control command being used to control the corresponding switching switches to switch to the first DC bus; and a second control command is sent to the switching switches corresponding to photovoltaic unit D, photovoltaic unit E and photovoltaic unit F respectively, the second control command being used to control the corresponding switching switches to switch to the second DC bus.

[0083] Since the charging power demand of the first DC / DC charging pile is less than that of the second DC / DC charging pile, a second control command is sent to the corresponding switch of the energy storage unit to control the corresponding switch to switch to the second DC bus and adjust the charging and discharging state of the energy storage unit to the discharging state to supplement the power supply demand.

[0084] It should be noted that when the number of photovoltaic units is odd, it is impossible to distribute the photovoltaic units equally. In this case, an even number of photovoltaic units can be selected from the multi-channel photovoltaic units and the above-mentioned equal distribution operation can be performed to equip each DC bus with the same number of photovoltaic units.

[0085] For example, if the system includes a power grid, and if the energy storage unit and photovoltaic unit cannot meet the charging needs of the DC / DC charging pile, the remaining charging needs can also be met by rectifying and supplying power from the power grid through their respective corresponding energy storage converters.

[0086] Wherein, α represents the photovoltaic unit or energy storage unit connected to the first DC bus, and β represents the photovoltaic unit and energy storage unit connected to the second DC bus; the numerical value represents the connected power; when the power value of the energy storage unit is positive, it is in charging state, and when it is negative, it is in discharging state; when the power value of the first energy storage converter or the second energy storage converter is positive, it is in inverter mode, and when it is negative, it is in rectification mode.

[0087] For example, the energy storage unit shown in Table 2 corresponds to -β120, which means that the energy storage unit is connected to the second DC bus and is in a discharge state with a discharge power of 120kW.

[0088] Table 2 Status and Operation Table of Each Unit or Device in the Photovoltaic Storage and Charging System Based on Dual DC Bus

[0089] It should be noted that the data in Table 2 above are only examples, and the specific values ​​can be determined according to the actual situation, and are not limited here; for the case where the charging power requirement of the first DC / DC charging pile is greater than that of the second DC / DC charging pile, the specific implementation method is the same as that in the above embodiment, and will not be repeated here.

[0090] As can be seen in this example, under the dual DC bus architecture, when photovoltaic output is insufficient and load demand is high, the energy management unit optimizes resource allocation through an "energy storage supplement / photovoltaic power supply mode," dynamically allocating the access strategies of photovoltaic units and energy storage units, thus achieving intelligent power supply in cases of insufficient photovoltaic power generation. Furthermore, it supplements the photovoltaic shortfall by discharging the energy storage units, ensuring the normal operation of the charging piles. Establishing a three-tiered power supply system from photovoltaic to energy storage to the grid helps guarantee that charging needs are met; and it improves the power supply guarantee capability and operational economy of the photovoltaic-energy storage-charging system under various operating conditions.

[0091] In one possible example, sending control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit according to the power allocation strategy includes the following steps: If the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile or the charging power demand of the second DC / DC charging pile meets the third charging power demand, then the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile are compared. If the charging power requirement of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then a third minimum number of photovoltaic units is determined to meet the charging power requirement of the first DC / DC charging pile; a third photovoltaic unit with the third minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a first control command is sent to the corresponding switch of the third photovoltaic unit, the first control command being used to control the corresponding switch of the third photovoltaic unit to switch to the first DC bus; and a second control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the third photovoltaic unit, the second control command being used to control the corresponding switches of the other photovoltaic units to switch to the second DC bus; and a second control command is sent to the corresponding switch of the energy storage unit, the second control command being used to control the corresponding switch of the energy storage unit to switch to the second DC bus. If the charging power demand of the first DC / DC charging pile is greater than that of the second DC / DC charging pile, then a fourth minimum number of photovoltaic units is determined to meet the charging power demand of the second DC / DC charging pile; a fourth photovoltaic unit of the fourth minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a second control command is sent to the corresponding switch of the fourth photovoltaic unit, the second control command being used to control the corresponding switch of the fourth photovoltaic unit to switch onto the second DC bus; and a first control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the fourth photovoltaic unit, the first control command being used to control the corresponding switches of the other photovoltaic units to switch onto the first DC bus; and a first control command is sent to the corresponding switch of the energy storage unit, the first control command being used to control the corresponding switch of the energy storage unit to switch onto the first DC bus.

[0092] Specifically, when the energy management unit determines that there is a high-power charging demand among the charging power demands of the first DC / DC charging piles corresponding to the first DC bus and the second DC bus, respectively, and the charging demand of the DC / DC charging piles on the other DC bus is relatively small, it determines that the charging power demand of the first DC / DC charging pile or the charging power demand of the second DC / DC charging pile at this time meets the third charging power demand. The power mutual assistance operation mode described in this example can be selected as the optimal operation mode, and the power allocation strategy corresponding to the power mutual assistance operation mode can be obtained. The switching on or off of the switching switches corresponding to the photovoltaic unit and / or energy storage unit can be adjusted according to the power allocation strategy.

[0093] The number of photovoltaic units in the third and fourth minimum photovoltaic units mentioned above can be preset by the system or unit, and are not limited here.

[0094] For example, if the system includes a power grid, the charging and discharging state of the energy storage unit is adjusted to the discharging state. If the energy storage unit and the photovoltaic unit cannot meet the charging demand of the DC / DC charging pile, the remaining charging demand can also be obtained from the power grid through rectification by their respective corresponding energy storage converters.

[0095] As can be seen in this example, under the dual DC bus architecture, when the charging piles on one DC bus have a high power charging demand while the demand on the other bus is lower, the energy management unit can intelligently schedule the charging through the "power mutual assistance operation mode" to concentrate most of the photovoltaic units and energy storage units to supply the charging piles with high demand, ensuring that important charging tasks are completed first; through the power complementarity between the two buses, the optimal utilization of the overall system resources is achieved, which is conducive to improving the system's coordination capabilities.

[0096] In one possible example, sending control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit according to the power allocation strategy includes the following steps: if the power allocation strategy indicates insufficient photovoltaic power or if it is nighttime operation, comparing the loads corresponding to the first DC bus and the second DC bus respectively; if the load corresponding to the first DC bus is larger, sending a first control command to the switching switch corresponding to the energy storage unit, the first control command being used to control the switching switch corresponding to the energy storage unit to switch to the first DC bus; if the load corresponding to the second DC bus is larger, sending a second control command to the switching switch corresponding to the energy storage unit, the second control command being used to control the switching switch corresponding to the energy storage unit to switch to the second DC bus; and adjusting the charging and discharging state of the energy storage unit to a high-power discharge state.

[0097] If the power allocation strategy indicates insufficient photovoltaic power or if the operation is at night, the energy storage supplement / energy storage converter power supply mode described in this example is selected as the optimal operating mode, and the corresponding power allocation strategy is obtained. The switching switches corresponding to the photovoltaic unit and / or energy storage unit are adjusted to be switched on or off according to the power allocation strategy.

[0098] If the system includes a power grid, and the energy storage unit and photovoltaic unit cannot meet the charging needs of the DC / DC charging pile, the remaining charging needs can also be obtained from the power grid through rectification by their respective corresponding energy storage converters.

[0099] As can be seen in this example, when photovoltaic power is insufficient or during nighttime operation, the system ensures continuous power supply through the "energy storage supplement / energy storage converter power supply mode", realizing intelligent energy storage power supply and load priority guarantee mechanism under conditions without photovoltaic power; intelligently identifying DC bus with large load and prioritizing the allocation of energy storage resources to high-demand areas helps to avoid resource waste and improve system reliability.

[0100] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application, applied to the energy management unit of a photovoltaic energy storage and charging system based on dual DC buses; such as Figure 3 As shown, the electronic device includes a processor, a memory, a communication interface, and one or more programs, which are stored in the memory and configured to be executed by the processor. When the processor executes the one or more programs stored in the memory, the processor executes instructions for the following steps: Obtain the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus respectively; A power allocation strategy is determined based on the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively. According to the power allocation strategy, control commands are sent to the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit, wherein the control commands are used to control the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

[0101] As can be seen, the electronic device described in the embodiments of this application can acquire the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively; determine a power allocation strategy based on the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively; and send control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit, respectively, according to the power allocation strategy. The control commands are used to control the switching switches corresponding to the energy storage unit and / or the photovoltaic unit to selectively switch to the first DC bus or the second DC bus. Therefore, by monitoring the operating parameters of energy storage units, photovoltaic units, DC / DC charging piles, energy storage converters, and DC buses in real time, the resource allocation can be dynamically adjusted according to changes in operating parameters, and the switching operation of the switching switch can be dynamically controlled. This allows the system to adapt to charging needs under different operating modes and intelligently formulate optimal power allocation strategies for precise power allocation, which is beneficial to improving the overall energy efficiency of the system.

[0102] In one possible example, the control command includes a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus, and the second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

[0103] In one possible example, according to the power allocation strategy, the processor sends control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit, and executes the following instructions: If the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile both meet the first charging power demand, then the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile are compared. If the charging power requirement of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then a first minimum number of photovoltaic units is determined to meet the charging power requirement of the first DC / DC charging pile; at least one first photovoltaic unit that meets the first minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a first control command is sent to the corresponding switch of each first photovoltaic unit, the first control command being used to control the corresponding switch of the first photovoltaic unit to switch onto the first DC bus; and a second control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the first photovoltaic unit, the second control command being used to control the corresponding switches of the other photovoltaic units to switch onto the second DC bus; and a second control command is sent to the corresponding switch of the energy storage unit, the second control command being used to control the corresponding switch of the energy storage unit to switch onto the second DC bus. If the charging power demand of the first DC / DC charging pile is greater than the charging power demand of the second DC / DC charging pile, then a second minimum number of photovoltaic units is determined to meet the charging power demand of the second DC / DC charging pile; at least one second photovoltaic unit that meets the second minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a second control command is sent to the corresponding switch of each second photovoltaic unit, the second control command being used to control the corresponding switch of the second photovoltaic unit to switch onto the second DC bus; and a first control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the second photovoltaic unit, the first control command being used to control the corresponding switches of the other photovoltaic units to switch onto the first DC bus; and a first control command is sent to the corresponding switch of the energy storage unit, the first control command being used to control the corresponding switch of the energy storage unit to switch onto the first DC bus.

[0104] It should be noted that all relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0105] The electronic device provided in this embodiment is used to execute the above-described switching control method for a photovoltaic energy storage and charging system based on dual DC buses, and thus can achieve the same effect as the above implementation method.

[0106] When using integrated units, the electronic device may include a processing module, a storage module, and a communication module. The processing module can be used to control and manage the actions of the electronic device; for example, it can support the electronic device in executing the steps performed by the aforementioned functional units. The storage module can support the electronic device in executing stored program code and data. The communication module can support communication between the electronic device and other devices.

[0107] The processing module can be a processor or a controller. It can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module can be a memory. The communication module can specifically be a radio frequency circuit, a Bluetooth chip, a Wi-Fi chip, or other devices that interact with other electronic devices.

[0108] When dividing each function into modules according to its corresponding function. Figure 4 This is a functional block diagram of a switching control device for a photovoltaic energy storage and charging system based on a dual DC bus, provided in an embodiment of this application. This switching control device is applied to the energy management unit of the photovoltaic energy storage and charging system based on a dual DC bus. The switching control device 400 for the photovoltaic energy storage and charging system based on a dual DC bus includes: The acquisition unit 401 is used to acquire the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus respectively; The determining unit 402 is used to determine a power allocation strategy based on the operating parameters corresponding to the energy storage unit, each of the photovoltaic units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively. The transmitting unit 403 is configured to send control commands to the switching switch corresponding to the energy storage unit and / or the switching switch corresponding to the photovoltaic unit according to the power allocation strategy, wherein the control commands are used to control the switching switch corresponding to the energy storage unit and / or the switching switch corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

[0109] As can be seen, the switching control device for a photovoltaic-storage-charging system based on a dual DC bus described in this application embodiment can acquire the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively; determine a power allocation strategy based on the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively; and send control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit, respectively, according to the power allocation strategy. The control commands are used to control the switching switches corresponding to the energy storage unit and / or the photovoltaic unit to selectively switch to the first DC bus or the second DC bus. Therefore, by monitoring the operating parameters of energy storage units, photovoltaic units, DC / DC charging piles, energy storage converters, and DC buses in real time, the resource allocation can be dynamically adjusted according to changes in operating parameters, and the switching operation of the switching switch can be dynamically controlled. This allows the system to adapt to charging needs under different operating modes and intelligently formulate optimal power allocation strategies for precise power allocation, which is beneficial to improving the overall energy efficiency of the system.

[0110] In one possible example, the control command includes a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus, and the second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

[0111] In one possible example, regarding the step of sending control commands to the switching switches corresponding to the energy storage unit and / or the photovoltaic unit according to the power allocation strategy, the sending unit 403 is specifically used for: If the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile both meet the first charging power demand, then the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile are compared. If the charging power requirement of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then a first minimum number of photovoltaic units is determined to meet the charging power requirement of the first DC / DC charging pile; at least one first photovoltaic unit that meets the first minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a first control command is sent to the corresponding switch of each first photovoltaic unit, the first control command being used to control the corresponding switch of the first photovoltaic unit to switch onto the first DC bus; and a second control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the first photovoltaic unit, the second control command being used to control the corresponding switches of the other photovoltaic units to switch onto the second DC bus; and a second control command is sent to the corresponding switch of the energy storage unit, the second control command being used to control the corresponding switch of the energy storage unit to switch onto the second DC bus. If the charging power demand of the first DC / DC charging pile is greater than the charging power demand of the second DC / DC charging pile, then a second minimum number of photovoltaic units is determined to meet the charging power demand of the second DC / DC charging pile; at least one second photovoltaic unit that meets the second minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a second control command is sent to the corresponding switch of each second photovoltaic unit, the second control command being used to control the corresponding switch of the second photovoltaic unit to switch onto the second DC bus; and a first control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the second photovoltaic unit, the first control command being used to control the corresponding switches of the other photovoltaic units to switch onto the first DC bus; and a first control command is sent to the corresponding switch of the energy storage unit, the first control command being used to control the corresponding switch of the energy storage unit to switch onto the first DC bus.

[0112] This application also provides a computer storage medium storing a computer program for electronic data interchange, which causes a computer to perform some or all of the steps of any of the methods described in the above method embodiments, wherein the computer includes an electronic device.

[0113] This application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods described in the above method embodiments. The computer program product may be a software installation package, and the computer includes a control platform.

[0114] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0115] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0117] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0118] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0119] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0120] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage device, which may include: a flash drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk, etc.

[0121] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A photovoltaic energy storage and charging system based on dual DC buses, characterized in that, The photovoltaic-energy storage-charging system includes: an energy management unit, a photovoltaic and energy storage unit, a first DC / DC charging pile, a second DC / DC charging pile, a first energy storage converter, and a second energy storage converter; wherein... The photovoltaic and energy storage unit includes an energy storage unit and multiple photovoltaic units. The output terminal of the energy storage unit and the output terminal of each photovoltaic unit are independently connected to a switching switch. The switching switch is used to switch the corresponding energy storage unit or photovoltaic unit to the first DC bus to connect to the first terminal of the first energy storage converter and / or the input terminal of the first DC / DC charging pile. Alternatively, the switching switch is used to switch the corresponding energy storage unit or photovoltaic unit to the second DC bus to connect to the first terminal of the second energy storage converter and / or the input terminal of the second DC / DC charging pile. The energy management unit establishes communication connections with the photovoltaic and energy storage units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, and the second energy storage converter, respectively, and is used to send control commands to the corresponding switching switches of the energy storage units and / or the corresponding switching switches of the photovoltaic units. The control commands are used to control the corresponding switching switches of the energy storage units and / or the corresponding switching switches of the photovoltaic units to selectively switch to the first DC bus or the second DC bus. The control commands include a first control command and a second control command. The energy management unit is further configured to: if a fault is detected in the first DC bus, the first energy storage converter, or the first DC / DC charging pile, send the second control command to the corresponding switching switch of the energy storage unit connected to the first DC bus and / or the corresponding switching switch of the photovoltaic unit; if a fault is detected in the second DC bus, the second energy storage converter, or the second DC / DC charging pile, send the first control command to the corresponding switching switch of the energy storage unit connected to the second DC bus and / or the corresponding switching switch of the photovoltaic unit.

2. The system according to claim 1, characterized in that, The first DC / DC charging pile is paired with the first energy storage converter and connected to the first DC bus; the second DC / DC charging pile is paired with the second energy storage converter and connected to the second DC bus.

3. The system according to claim 1 or 2, characterized in that, The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus, and the second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

4. The system according to claim 1 or 2, characterized in that, The photovoltaic energy storage and charging system further includes: a power grid; the second end of the first energy storage converter and the second end of the second energy storage converter are respectively electrically connected to the power grid.

5. A switching control method for a photovoltaic-storage-charging system based on dual DC buses, characterized in that, The method, applied to an energy management unit in a photovoltaic energy storage and charging system based on a dual DC bus as described in any one of claims 1-4, comprises: Obtain the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus respectively; A power allocation strategy is determined based on the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus, and / or the second DC bus, respectively. According to the power allocation strategy, control commands are sent to the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit, wherein the control commands are used to control the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

6. The method according to claim 5, characterized in that, The control commands include a first control command and a second control command. The first control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the first DC bus. The second control command is used to control the switching switch corresponding to the energy storage unit or the switching switch corresponding to the photovoltaic unit to switch to the second DC bus.

7. The method according to claim 6, characterized in that, The step of sending control commands to the corresponding switching switches of the energy storage unit and / or the photovoltaic unit according to the power allocation strategy includes: If the power allocation strategy indicates that the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile both meet the first charging power demand, then the charging power demand of the first DC / DC charging pile and the charging power demand of the second DC / DC charging pile are compared. If the charging power requirement of the first DC / DC charging pile is less than that of the second DC / DC charging pile, then a first minimum number of photovoltaic units is determined to meet the charging power requirement of the first DC / DC charging pile; at least one first photovoltaic unit that meets the first minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a first control command is sent to the corresponding switch of each first photovoltaic unit, the first control command being used to control the corresponding switch of the first photovoltaic unit to switch onto the first DC bus; and a second control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the first photovoltaic unit, the second control command being used to control the corresponding switches of the other photovoltaic units to switch onto the second DC bus; and a second control command is sent to the corresponding switch of the energy storage unit, the second control command being used to control the corresponding switch of the energy storage unit to switch onto the second DC bus. If the charging power demand of the first DC / DC charging pile is greater than the charging power demand of the second DC / DC charging pile, then a second minimum number of photovoltaic units is determined to meet the charging power demand of the second DC / DC charging pile; at least one second photovoltaic unit that meets the second minimum number of photovoltaic units is selected from the multiple photovoltaic units, and a second control command is sent to the corresponding switch of each second photovoltaic unit, the second control command being used to control the corresponding switch of the second photovoltaic unit to switch onto the second DC bus; and a first control command is sent to the corresponding switches of other photovoltaic units in the multiple photovoltaic units besides the second photovoltaic unit, the first control command being used to control the corresponding switches of the other photovoltaic units to switch onto the first DC bus; and a first control command is sent to the corresponding switch of the energy storage unit, the first control command being used to control the corresponding switch of the energy storage unit to switch onto the first DC bus.

8. A switching control device for a photovoltaic-storage-charging system based on a dual DC bus, characterized in that, An energy management unit applied in a photovoltaic energy storage and charging system based on a dual DC bus as described in any one of claims 1-4, the device comprising: The acquisition unit is used to acquire the operating parameters corresponding to the energy storage unit, each photovoltaic unit, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively. The determining unit is used to determine a power allocation strategy based on the operating parameters corresponding to the energy storage unit, each of the photovoltaic units, the first DC / DC charging pile, the second DC / DC charging pile, the first energy storage converter, the second energy storage converter, the first DC bus and / or the second DC bus, respectively. The transmitting unit is configured to send control commands to the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit according to the power allocation strategy, wherein the control commands are used to control the switching switches corresponding to the energy storage unit and / or the switching switches corresponding to the photovoltaic unit to selectively switch to the first DC bus or the second DC bus.

9. An electronic device, used as an energy management unit in a photovoltaic energy storage and charging system based on dual DC buses, characterized in that, It includes a processor, memory, a communication interface, and one or more programs, which are stored in the memory and configured to be executed by the processor; When the processor executes the one or more programs stored in the memory, the processor performs the method as described in any one of claims 5 to 7.

Images