Mode switching control method, system and equipment of three-port converter and medium

Abstract

The invention belongs to the technical field of energy storage, and particularly relates to a mode switching control method, system and equipment for a three-port converter in a hybrid energy storage system and a medium, and the method comprises the steps: obtaining the power demand of a load and the charge state of an electric energy storage device in the hybrid energy storage system, determining the energy flow direction among the load, the electric energy storage device and the hydrogen energy storage device according to the power relationship between the load and the hydrogen energy storage device and the charge state interval of the electric energy storage device, and controlling the three-port converter to switch among three working modes, namely a single-input double-output mode, a double-input single-output mode and a single-input single-output mode. According to the invention, the flexibility and reliability of the three-port converter are effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of energy storage technology, specifically relating to a mode switching control method, system, device and medium for a three-port converter in a hybrid energy storage system. Background Technology

[0002] To reduce dependence on traditional fossil fuels, there is an urgent need to explore new energy fuels, and hydrogen energy, as a clean, pollution-free, and widely available new energy source, is receiving increasing attention. Fuel cells (FCs), due to their high energy density and clean operation, have become the main form of hydrogen energy application and have attracted much attention. However, because fuel cells have poor dynamic response and cannot meet instantaneous power demands alone, hybrid energy storage systems (HESS) that combine fuel cells with electrical energy storage devices have emerged. Hybrid energy storage systems can be applied to transportation vehicles and / or renewable energy systems. Transportation vehicles include, but are not limited to, passenger cars, trucks, buses, ships, and aircraft; renewable energy systems include, but are not limited to, power grids and microgrids; and hybrid energy storage systems include at least electrical energy storage devices and fuel cells. Electrical energy storage devices include, but are not limited to, supercapacitors, lithium-ion batteries, and sodium-ion batteries; and fuel cells include, but are not limited to, proton exchange membrane fuel cells, alkaline fuel cells, phosphoric acid fuel cells, solid oxide fuel cells, and molten carbonate fuel cells.

[0003] To manage the energy flow between fuel cells, energy storage devices, and loads simultaneously, three-port converters are often used. Three-port converters generally have three operating modes: Single input dual output (SIDO), Dual input single output (DISO), and Single input single output (SISO). The switching between these modes is divided into active and passive modes. However, a more complete active control scheme has not yet been designed for the various complex operating conditions of hybrid energy storage systems. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to propose an active control scheme for a three-port converter in a hybrid energy storage system, which can effectively improve the flexibility and reliability of the three-port converter for various complex operating conditions of the hybrid energy storage system.

[0005] To achieve the above and other related objectives, the present invention provides a mode switching control method for a three-port converter in a hybrid energy storage system, comprising: acquiring the current power demand of the load; acquiring the current state of charge (SOC) of the electrical energy storage device in the hybrid energy storage system; and controlling the three-port converter to switch between three operating modes, SIDO, DISO, and SISO, based on the current power demand of the load and the current SOC of the electrical energy storage device in the hybrid energy storage system.

[0006] According to a specific embodiment of the present invention, the step of controlling a three-port converter to switch between three operating modes—SIDO, DISO, and SISO—based on the current power demand of the load and the current state of charge (SOC) of the energy storage device in the hybrid energy storage system includes: when the current SOC of the energy storage device is higher than a preset maximum value, controlling the three-port converter to switch to DISO or SISO operating mode based on the current power demand of the load; when the current SOC of the energy storage device is within a preset desired range, controlling the three-port converter to switch between SIDO, DISO, and SISO operating modes based on the current power demand of the load; and when the current SOC of the energy storage device is lower than a preset minimum value, controlling the three-port converter to switch to SISO or SIDO operating mode based on the current power demand of the load.

[0007] According to a specific embodiment of the present invention, when the current SOC of the electric energy storage device is higher than a preset maximum value, the step of controlling the three-port converter to switch to DISO or SISO operating mode according to the current power demand of the load includes: if the current power demand of the load is lower than the minimum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to SISO operating mode; if the current power demand of the load is higher than the maximum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to DISO operating mode.

[0008] According to a specific embodiment of the present invention, when the current SOC of the electric energy storage device is higher than a preset maximum value, the three-port converter is controlled to switch to DISO working mode or SISO working mode according to the current power demand of the load. The method further includes: if the current power demand of the load is between the minimum and maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to maintain the current working mode.

[0009] According to a specific embodiment of the present invention, when the current State of Charge (SOC) of the energy storage device is within a preset desired range, the step of controlling the three-port converter to switch between three operating modes—SIDO, DISO, and SISO—based on the current power demand of the load includes: if the current power demand of the load is lower than the minimum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to SIDO operating mode; if the current power demand of the load is between the minimum and maximum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to SISO operating mode; if the current power demand of the load is higher than the maximum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to DISO operating mode.

[0010] According to a specific embodiment of the present invention, when the current SOC of the electric energy storage device is lower than a preset minimum value, the step of controlling the three-port converter to switch to SISO or SIDO operating mode according to the current power demand of the load includes: if the current power demand of the load is lower than the minimum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to SIDO operating mode; if the current power demand of the load is higher than the maximum output power of the hydrogen energy storage device in the hybrid energy storage system, then the three-port converter is controlled to switch to SISO operating mode.

[0011] According to a specific embodiment of the present invention, when the current SOC of the electric energy storage device is lower than a preset minimum value, the three-port converter is controlled to switch to SISO working mode or SIDO working mode according to the current power demand of the load. The method further includes: if the current power demand of the load is between the minimum and maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to maintain the current working mode.

[0012] A control system for a three-port converter in a hybrid energy storage system includes: a power input module for acquiring the current power demand of the load; a state of charge input module for acquiring the current state of charge (SOC) of the energy storage device in the hybrid energy storage system; and a mode switching module for controlling the three-port converter to switch between three operating modes—SIDO, DISO, and SISO—based on the current power demand of the load and the current SOC of the energy storage device in the hybrid energy storage system.

[0013] An electronic device includes a processor coupled to a memory storing program instructions that, when executed by the processor, implement the method described above.

[0014] A computer-readable storage medium includes a program that, when run on a computer, causes the computer to perform the method described above.

[0015] This invention provides a mode switching control method for a three-port converter in a hybrid energy storage system. The method uses the real-time change of the State of Charge (SOC) of the electrical energy storage device in the hybrid energy storage system as the first reference standard, and whether the output power of the hydrogen energy storage device in the hybrid energy storage system can meet the real-time power demand changes of the load as the second reference standard. This allows the three-port converter to switch rapidly between three operating modes: SIDO, SISO, and DISO, thereby achieving active control of the three-port converter, adapting to scenario requirements, and effectively improving the flexibility and reliability of the three-port converter. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a specific embodiment of a mode switching control method for a three-port converter in a hybrid energy storage system provided by the present invention.

[0017] Figure 2 This is a structural schematic diagram of a specific embodiment of a mode switching control system for a three-port converter in a hybrid energy storage system provided by the present invention;

[0018] Figure 3 This is a structural block diagram of a specific embodiment of an electronic device provided by the present invention. Detailed Implementation

[0019] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, publicly known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] Example 1

[0023] See Figure 1 The method for mode switching control of a three-port converter in a hybrid energy storage system, as shown, includes:

[0024] Step S110: Obtain the current power demand of the load.

[0025] Step S120: Obtain the current SOC of the electrical energy storage device in the hybrid energy storage system.

[0026] Step S200: Based on the current power demand of the load and the current SOC of the electric energy storage device in the hybrid energy storage system, control the three-port converter to switch between three operating modes: SIDO, DISO, and SISO.

[0027] First, it should be noted that the hybrid energy storage system mentioned in this embodiment is mainly composed of a combination of electrical energy storage devices and hydrogen energy storage devices. This hybrid energy storage system can be applied to electrified transportation vehicles or renewable energy systems. For electrified transportation vehicles, it includes, but is not limited to, passenger cars, trucks, buses, ships, and airplanes. For renewable energy systems, it includes, but is not limited to, power grids and microgrids.

[0028] It is understandable that both hydrogen and electrical energy storage devices can supply power, with hydrogen storage typically being the primary supplier. Electrical energy storage serves as an energy buffer, meaning it can recharge the hydrogen storage device when the load's power demand is low, and it works in conjunction with the hydrogen storage device to power the load when the demand is high. Furthermore, it is understandable that when the hydrogen storage device can independently meet the load's needs, there is no need for the electrical storage device to discharge. Based on this, a three-port converter can well meet the requirements of this application scenario, thus it can be used as a DC-DC converter in a hybrid energy storage system to manage the energy flow between the hydrogen storage device, the electrical storage device, and the load.

[0029] It should be noted that the three-port converter has three operating modes: SIDO, DISO, and SISO. Based on the application scenarios described above, when the three-port converter is in SIDO mode, the hydrogen energy storage device powers both the electrical energy storage device and the load; when the three-port converter is in DISO mode, both the hydrogen and electrical energy storage devices power the load; and when the three-port converter is in SISO mode, only the hydrogen energy storage device powers the load.

[0030] It should also be noted that in this embodiment, the hydrogen energy storage device that can supply energy is specifically taken as a fuel cell, while the electric energy storage device is taken as a supercapacitor. Accordingly, the energy storage system is composed of a fuel cell and a supercapacitor. This is not a limitation. Modifications and refinements made by those skilled in the art to the embodiments of the present invention without departing from the spirit of the present invention still fall within the scope of the invention application patent of the present invention.

[0031] Based on the above, in order to maintain the SOC of the supercapacitor within the normal range as much as possible while meeting the load power requirements, charging is no longer allowed when the SOC of the supercapacitor is higher than the preset maximum value, and discharging is no longer allowed when the SOC of the supercapacitor is lower than the preset minimum value.

[0032] In response, three states are defined for the SOC of supercapacitors: SOC > SOC max Defined as SOC high; SOC ∈ [65, 85] is defined as SOC normal; SOC <SOC min Defined as SOC low.

[0033] Among them, SOC max and SOC min These are the preset maximum and minimum values, used to limit the upper and lower limits of the supercapacitor's SOC to prevent it from becoming saturated or depleted. The range [65, 85] represents a relatively stable range of supercapacitor SOC expected to be maintained in this embodiment, i.e., the desired range. This is for reference only and is not intended to limit the range; the range can be customized.

[0034] Therefore, the three-port converter can be controlled to switch between SIDO, DISO, and SISO operating modes based on the real-time SOC state of the supercapacitor and changes in the load's power requirements. Correspondingly, this requires real-time monitoring of changes in the load's power demand and fluctuations in the supercapacitor's SOC during the hybrid energy storage system's power supply to the load.

[0035] Specifically, when the supercapacitor's SOC exceeds a preset maximum value, it enters the SOC high state. Understandably, since the supercapacitor's SOC has reached its upper limit, to prevent overvoltage, further charging is unnecessary. This also means the three-port converter doesn't need to switch to SIDO operating mode to allow the fuel cell to charge the supercapacitor. At this point, if the current power demand of the load is lower than the minimum output power of the fuel cell, i.e., the load power P... o Minimum output power P of fuel cell FC,min Since the fuel cell can meet the load's power demand, the three-port converter can be switched to SISO operating mode. This can be understood as the supercapacitor entering SOC high mode, indicating that the three-port converter was in SIDO operating mode before switching to SISO mode. This allows the fuel cell to simultaneously supply power to the load and charge the supercapacitor. Therefore, in this operating condition, the three-port converter switches from SIDO to SISO mode. If the current power demand of the load exceeds the maximum output power of the fuel cell, i.e., the load power P... o The maximum output power P of the fuel cell FC,max Since the fuel cell alone cannot meet the load's power demand, and the supercapacitor's state of charge (SOC) is sufficiently high, the three-port converter can be switched to DISO operating mode. It's important to understand that the three-port converter can operate in either SIDO or SISO mode before switching to DISO. Therefore, under this condition, the three-port converter can switch from SIDO to DISO mode or vice versa; there are no restrictions on this.

[0036] Furthermore, if the current power demand of the load is between the minimum and maximum output power of the fuel cell, i.e., the load power P... o ∈[P FC,min , P FC,max The three-port converter can be controlled to maintain its current operating mode. Normally, because the power demand of the load must be prioritized, the supercapacitor cannot be powered, and the three-port converter will be in SISO operating mode.

[0037] When the supercapacitor's State of Charge (SOC) is within the preset desired range, it enters the SOC normal state. This means that since the supercapacitor's SOC has neither reached its upper nor lower limit, it can both charge for energy storage and discharge for energy supply. At this point, if the current power demand of the load is lower than the minimum output power of the fuel cell, i.e., the load power P... o Minimum output power P of fuel cell FC,minSince the fuel cell can meet the load's power demand, and the supercapacitor's SOC has not reached its upper limit, the three-port converter can be switched to SIDO mode to allow the fuel cell to simultaneously power both the load and the supercapacitor. It can be understood that the three-port converter can be in either DISO or SISO mode before switching to SIDO mode. If the load's current power demand is between the minimum and maximum output power of the fuel cell, i.e., the load power P... o ∈[P FC,min , P FC,max Alternatively, the current power demand of the load should match the actual output power of the fuel cell, i.e., the load power P. o = Output power P of fuel cell FC Since priority must be given to meeting the load's power demand, and power cannot be supplied to the supercapacitor, the three-port converter can be switched to SISO operating mode. Similarly, before switching to SISO operating mode, the three-port converter can be in either DISO or SIDO operating mode. If the current power demand of the load exceeds the maximum output power of the fuel cell, i.e., the load power P... o The maximum output power P of the fuel cell FC,max The corresponding controllable three-port converter can switch to DISO operating mode so that the supercapacitor and fuel cell can power the load together. Similarly, the three-port converter can be in either SISO or SIDO operating mode before switching to DISO operating mode.

[0038] When the SOC of the supercapacitor falls below a preset minimum value, it enters the SOC low state. Understandably, since the supercapacitor's SOC has reached its lower limit, it cannot further discharge to supply energy to prevent undervoltage. This also explains why the three-port converter does not need to consider switching to DISO operating mode. At this time, if the current power demand of the load is lower than the minimum output power of the fuel cell, i.e., the load power P... o Minimum output power P of fuel cell FC,min The corresponding controllable three-port converter switches to SIDO operating mode, allowing the fuel cell to simultaneously power both the load and the supercapacitor, gradually increasing the supercapacitor's SOC while meeting the load's power demand. This can be understood as the supercapacitor entering a low SOC state indicating that the three-port converter may have been in DISO operating mode before switching to SIDO, thus lowering the supercapacitor's SOC to its lower limit. However, the three-port converter can also operate in SISO mode to fully meet the load's demand. If the load's current power demand exceeds the fuel cell's maximum output power, i.e., the load power P... oThe maximum output power P of the fuel cell FC,max Although the fuel cell power supply can no longer meet the complex demands, to avoid over-discharge of the supercapacitor, the three-port converter must be switched to SISO operating mode to meet the load's power requirements as much as possible. This means that since the supercapacitor has reached its low SOC, the three-port converter was in DISO operating mode before switching to SISO, which is why the supercapacitor's SOC dropped to the lower limit, rather than being in SIDO operating mode. If the three-port converter were in SIDO operating mode, the supercapacitor's SOC would only gradually increase, not decrease to the lower limit. Therefore, under this operating condition, the three-port converter can switch from DISO to SISO operating mode.

[0039] Furthermore, if the current power demand of the load is between the minimum and maximum output power of the fuel cell, i.e., the load power P... o ∈[P FC,min , P FC,max The three-port converter can be controlled to maintain its current operating mode. Normally, because it needs to meet the power requirements of the load and the supercapacitor cannot discharge to provide energy, the three-port converter will only operate in SISO mode.

[0040] It should be noted that the steps of the various methods described above are only for clarity. In practice, they can be combined into one step or some steps can be split into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this application. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, but without changing the core design of the algorithm and process, are also within the scope of protection of this application.

[0041] Example 2

[0042] See Figure 2 As shown, this embodiment also provides a mode switching control system for a three-port converter in a hybrid energy storage system, including:

[0043] The power input module 10 is used to obtain the current power demand of the load.

[0044] The State of Charge (SOC) input module 20 is used to obtain the current SOC of the electrical energy storage device in the hybrid energy storage system.

[0045] The mode switching module 30 is used to control the three-port converter to switch between three working modes, SIDO, DISO and SISO, according to the current power demand of the load and the current SOC of the electric energy storage device in the hybrid energy storage system.

[0046] It should be noted that the mode switching control system for the three-port converter in the hybrid energy storage system provided in the above embodiments belongs to the same concept as the mode switching control method for the three-port converter in the hybrid energy storage system provided in Embodiment 1 above. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the mode switching control method for the three-port converter in the hybrid energy storage system provided in Embodiment 1 above can be used to allocate the above functions to different functional modules as needed, that is, to divide the internal structure of the device into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0047] Example 3

[0048] See Figure 3 As shown, embodiments of this application also provide an electronic device, including a memory 2, a processor 1, and a program stored in the memory and executable on the processor, wherein the processor executes the steps of any of the methods described above.

[0049] The memory includes at least one type of readable storage medium, such as flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory can be an internal storage unit of an electronic device, such as a portable hard drive. In other embodiments, the memory can be an external storage device of the electronic device, such as a plug-in portable hard drive, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, etc. Furthermore, the memory can include both internal and external storage units of the electronic device. The memory can be used not only to store application software and various types of data installed on the electronic device, but also to temporarily store data that has been output or will be output.

[0050] In some embodiments, the processor may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits packaged with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor is the control unit of the electronic device, connecting various components of the entire electronic device through various interfaces and lines. It executes programs or modules stored in the memory and calls data stored in the memory to perform various functions and process data of the electronic device. The processor executes the operating system and various installed application programs of the electronic device. The processor executes the application programs to implement the steps in the above method embodiments.

[0051] For example, the program may be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of program instruction segments capable of performing a specific function, which describe the execution process of the program in the electronic device.

[0052] The integrated unit implemented as a software functional module described above can be stored in a computer-readable storage medium. This software functional module, stored in a storage medium, includes several instructions to cause a computer device (which may be a personal computer, computer equipment, or network device, etc.) or processor to execute some of the functions of the various embodiments of the present invention.

[0053] In summary, this invention provides a mode switching control method for a three-port converter in a hybrid energy storage system. It uses the real-time change in the State of Charge (SOC) of the electrical energy storage device in the hybrid energy storage system as the first reference standard, and whether the output power of the hydrogen energy storage device in the hybrid energy storage system can meet the real-time power demand changes of the load as the second reference standard. This allows the three-port converter to quickly switch between three operating modes: SIDO, SISO, and DISO, achieving active control of the three-port converter, adapting to scenario requirements, and effectively improving the flexibility and reliability of the three-port converter's operation.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A mode switching control method for a three-port converter in a hybrid energy storage system, characterized in that, include: Get the current power requirement of the load; Obtain the current state of charge of the electrical energy storage device in the hybrid energy storage system; Based on the current power demand of the load and the current state of charge of the electric energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch between three operating modes: single-input dual-output, dual-input single-output, and single-input single-output.

2. The mode switching control method for a three-port converter in a hybrid energy storage system according to claim 1, characterized in that, Based on the current power demand of the load and the current state of charge of the electrical energy storage devices in the hybrid energy storage system, the steps for controlling the three-port converter to switch between three operating modes—single-input dual-output, dual-input single-output, and single-input single-output—include the following: When the current state of charge of the energy storage device is higher than the preset maximum value, the three-port converter is controlled to switch to dual-input single-output working mode or single-input single-output working mode according to the current power demand of the load. When the current state of charge of the energy storage device is within the preset desired range, the three-port converter is controlled to switch between three working modes: single input dual output, dual input single output, and single input single output, according to the current power demand of the load. When the current state of charge of the energy storage device is lower than the preset minimum value, the three-port converter is controlled to switch to single-input single-output working mode or single-input dual-output working mode according to the current power demand of the load.

3. The mode switching control method for a three-port converter in a hybrid energy storage system according to claim 2, characterized in that, When the current state of charge of the energy storage device is higher than the preset maximum value, the steps of controlling the three-port converter to switch to dual-input single-output or single-input single-output operating mode according to the current power demand of the load include: If the current power demand of the load is lower than the minimum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to single-input single-output working mode. If the current power demand of the load is higher than the maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to dual-input single-output operating mode.

4. The mode switching control method for a three-port converter in a hybrid energy storage system according to claim 2, characterized in that, When the current state of charge of the energy storage device is higher than a preset maximum value, the three-port converter is controlled to switch to a dual-input single-output operating mode or a single-input single-output operating mode according to the current power demand of the load, and the following is also included: If the current power demand of the load is between the minimum and maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to maintain the current operating mode.

5. The mode switching control method for a three-port converter in a hybrid energy storage system according to claim 2, characterized in that, When the current state of charge of the energy storage device is within a preset desired range, the steps of controlling the three-port converter to switch between three operating modes—single-input dual-output, dual-input single-output, and single-input single-output—based on the current power demand of the load include: If the current power demand of the load is lower than the minimum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to single-input dual-output working mode. If the current power demand of the load is between the minimum and maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to single-input single-output working mode. If the current power demand of the load is higher than the maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to dual-input single-output operating mode.

6. The mode switching control method for a three-port converter in a hybrid energy storage system according to claim 2, characterized in that, When the current state of charge of the energy storage device is lower than a preset minimum value, the steps of controlling the three-port converter to switch to single-input single-output or single-input dual-output operating mode according to the current power demand of the load include: If the current power demand of the load is lower than the minimum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to single-input dual-output working mode. If the current power demand of the load is higher than the maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to switch to single-input single-output operating mode.

7. The mode switching control method for a three-port converter in a hybrid energy storage system according to claim 2, characterized in that, When the current state of charge of the energy storage device is lower than a preset minimum value, the three-port converter is controlled to switch to a single-input single-output working mode or a single-input dual-output working mode according to the current power demand of the load, and the following is also included: If the current power demand of the load is between the minimum and maximum output power of the hydrogen energy storage device in the hybrid energy storage system, the three-port converter is controlled to maintain the current operating mode.

8. A mode switching control system for a three-port converter in a hybrid energy storage system, characterized in that, include: The power input module is used to obtain the current power demand of the load; The state of charge input module is used to obtain the current state of charge of the electrical energy storage device in the hybrid energy storage system; The mode switching module is used to control the three-port converter to switch between three working modes: single-input dual-output, dual-input single-output, and single-input single-output, based on the current power demand of the load and the current state of charge of the electric energy storage device in the hybrid energy storage system.

9. An electronic device, characterized in that, The method includes a processor coupled to a memory storing program instructions, which, when executed by the processor, implement the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Includes a program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1 to 7.

Images