Direct-current power optimization control method of multi-port energy converter and related device

Abstract

The invention discloses a direct-current power optimization control method of a multi-port energy converter and a related device, and belongs to the technical field of converters. According to the method, partition control is carried out according to the load power range, the most suitable power supply mode is automatically matched in different load power intervals, the system can dynamically adapt to different power demand scenes, resource configuration is optimized, and efficient and stable power supply under various working conditions is ensured. Meanwhile, an improved droop control method is adopted, current distribution between parallel power supplies / modules is balanced, a droop coefficient is dynamically adjusted by considering a temperature influence factor, the problem of uneven thermal stress distribution is effectively relieved, the service life of equipment is prolonged, and meanwhile the overall energy efficiency and thermal management performance are improved. The overall conversion efficiency of the multi-power-supply / module parallel system in different load intervals is improved, and the reliability of the whole power supply system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of converters, and in particular relates to a DC power optimization control method and related devices of a multi-port energy converter. Background Art

[0002] In multi-port energy converters, it is a common configuration to connect multiple power supplies or modules in parallel to supply power to the same load, which is mainly used to improve the reliability and / or power capacity of the power supply system. Compared with a single power supply, multiple power supplies / modules connected in parallel to supply power to the same load have the advantages of high reliability, redundancy, and easy expansion. In parallel power supplies / modules, an effective load current distribution method must be adopted to ensure the uniform distribution of current stress between power supplies / modules to prevent one or more power supplies / modules from operating in the current limit state, triggering the protection mechanism and affecting the normal operation of the power supply system.

[0003] In DC power supplies / modules, commonly used load current distribution methods include droop control, master / slave control, average current control, etc. Existing technologies (droop control, master / slave control, average current control, etc.) only consider the equal distribution of current stress, and do not consider the differences in thermal characteristics between power supplies / modules due to factors such as different usage time, different batches, and differences in power devices used, which is not conducive to temperature control of each power supply / module, resulting in an increase in the failure rate of the power supply / module and a decrease in power supply reliability. Summary of the invention

[0004] In view of this, the present invention aims to provide a DC power optimization control method and related devices for a multi-port energy converter, which balances the thermal stress between power supplies / modules by introducing a temperature influencing factor in the droop control, and adopts partition control to achieve an improvement in the overall conversion efficiency of a multi-power supply / module parallel system in different load ranges, thereby improving the power supply reliability of the multi-power supply / module parallel system.

[0005] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, the present invention provides a DC power optimization control method for a multi-port energy converter, comprising the following steps:

[0007] According to the correspondence between the load power range and the power supply mode, the power supply mode corresponding to the current load power range is determined. The load power range includes several adjacent load power intervals. The power supply mode specifies the power supply state configuration of the power supply / module when the load power demand in the corresponding power interval is met;

[0008] Power is supplied in the determined power supply mode, and the power supply / module in the power supply state is controlled by an improved droop control method to balance the thermal stress between each power supply / module. The improved droop control method introduces a temperature influence factor into the droop coefficient term of the droop control method to reflect the influence of temperature change on droop control.

[0009] Furthermore, the load power range is composed of several load power intervals that maximize the conversion efficiency of the power supply / module. In each load power interval, the conversion efficiency of the power supply / module in the power supply state in the corresponding power supply mode meets the maximum requirement.

[0010] Furthermore, let the load rate when the conversion efficiency of the power supply / module is the maximum be λ, then the load power range includes:

[0011] The first load power range , the second load power range and the third load power interval ,in, is the power supply / module rated power, is the load power, and N is the number of power supplies / modules.

[0012] Furthermore, the corresponding power supply modes include:

[0013] A first power supply mode, in which only one power supply / module is in a power supply state;

[0014] The second power supply mode, in which M power supplies / modules are in power supply state, , where Represents the ceiling operator;

[0015] In the third power supply mode, all power supplies / modules are in power supply state.

[0016] Furthermore, the first power supply mode and the second power supply mode also include a power supply / module in hot standby state.

[0017] Furthermore, the load factor is set to 30%.

[0018] Furthermore, the improved droop control method is controlled according to the following formula:

[0019]

[0020] In the formula, is the output voltage of a single power supply / module, is the open circuit output voltage of the power supply / module, is the droop coefficient of the droop coefficient term, is the output current of the power supply / module, is the power supply / module internal temperature, is the initial internal temperature when the power supply / module is turned on. is the temperature regulation coefficient, is regarded as the temperature influencing factor.

[0021] In a second aspect, the present invention provides a DC power optimization control device for a multi-port energy converter, comprising:

[0022] A selection module is used to select a power supply mode corresponding to the current load power range according to the corresponding relationship between the load power range and the power supply mode. The load power range includes several adjacent load power intervals. The power supply mode specifies the power supply state configuration of the power supply / module when the load power demand in the corresponding power interval is met;

[0023] The control module is used to supply power in the selected power supply mode, and adopts an improved droop control method to control the power supply / module in the power supply state to balance the thermal stress between each power supply / module. The improved droop control method introduces a temperature influence factor into the droop coefficient term on the basis of traditional droop control to reflect the influence of temperature change on droop control.

[0024] Accordingly, the present invention also provides a computer device, the device comprising a processor and a memory:

[0025] The memory is used to store the computer program and send the instructions of the computer program to the processor;

[0026] The processor executes a DC power optimization control method for a multi-port energy converter according to the instructions of the computer program as described in the first aspect.

[0027] Correspondingly, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, a DC power optimization control method for a multi-port energy converter as described in the first aspect is implemented.

[0028] In summary, the present invention provides a DC power optimization control method and related devices for a multi-port energy converter. The method automatically matches the most suitable power supply mode in different load power intervals by performing partition control according to the load power range. The system can dynamically adapt to different power demand scenarios, optimize resource allocation, and ensure efficient and stable power supply under various working conditions. At the same time, the method also adopts an improved droop control method, which not only balances the current distribution between parallel power supplies / modules, but also dynamically adjusts the droop coefficient by considering the temperature influencing factor, effectively alleviating the problem of uneven thermal stress distribution, extending the life of the equipment, and improving the overall energy efficiency and thermal management performance. The overall conversion efficiency of the multi-power supply / module parallel system in different load intervals is improved, and the reliability of the entire power supply system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A flow chart of a DC power optimization control method for a multi-port energy converter provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of an improved droop control method provided by an embodiment of the present invention;

[0032] Figure 3 A structural diagram of a DC power optimization control device for a multi-port energy converter provided by an embodiment of the present invention;

[0033] Figure 4 A structural diagram of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 This embodiment provides a DC power optimization control method for a multi-port energy converter, comprising the following steps:

[0036] S1: Determine the power supply mode corresponding to the current load power range according to the correspondence between the load power range and the power supply mode. The load power range includes several adjacent load power intervals. The power supply mode specifies the power supply state configuration of the power supply / module when the load power demand within the corresponding power interval is met.

[0037] It should be noted that in this step, the possible load power requirements are first divided into several adjacent power intervals. This is done to more finely match the optimal power supply strategy under different power requirements and ensure that the system can operate efficiently under various load conditions.

[0038] At the same time, a specific power supply mode is defined for each power range, which specifies how to configure the power supply status of the power supply / module (such as whether it is powered, whether it is hot standby, operating frequency, opening time, etc.) within the power range to most efficiently meet the load demand. This helps to optimize energy efficiency and reduce system burden.

[0039] S2: Power is supplied in the determined power supply mode, and the power supply / module in the power supply state is controlled by an improved droop control method to balance the thermal stress between each power supply / module. The improved droop control method is to introduce a temperature influence factor into the droop coefficient term of the droop control method to reflect the influence of temperature change on droop control.

[0040] It should be noted that in this step, according to the power supply mode determined in the previous step, the system adjusts the working state of the power supply / module to adapt to the current load power demand. This dynamic adjustment improves the response speed and adaptability of the system.

[0041] In addition, droop control is a common method for current distribution between parallel power supplies or modules, which balances the current by adjusting the output voltage. The improvement in this embodiment is that, in addition to the traditional current dependence, a temperature influence factor is introduced into the droop coefficient (usually expressed as the difference between the temperature and a certain reference temperature multiplied by an adjustment coefficient). This means that as the temperature inside the power supply / module changes, the droop coefficient will be adjusted accordingly, thereby dynamically adjusting the output voltage to ensure that the current distribution remains balanced under different temperature conditions, while reducing thermal stress, avoiding local overheating, and improving system reliability.

[0042] This embodiment provides a DC power optimization control method for a multi-port energy converter. This method achieves refined control of the multi-port energy converter by subdividing the load power interval and customizing the power supply mode for each interval, thereby improving the adaptability to various load conditions. The improved droop control that introduces the temperature influence factor is an innovation for thermal management. It not only optimizes the current distribution, but also takes into account the impact of temperature on system performance, so that the system can maintain efficient and stable operation under different working conditions, extend the service life of the equipment, and reduce maintenance costs. The overall conversion efficiency of the multi-power supply / module parallel system in different load intervals is improved, and the reliability of the entire power supply system is improved.

[0043] In a preferred embodiment of the present invention, the load power range is composed of a plurality of load power intervals that maximize the conversion efficiency of the power supply / module. In each load power interval, the conversion efficiency of the power supply / module in the power supply state under the corresponding power supply mode meets the maximum requirement.

[0044] The purpose of this embodiment is to improve the conversion efficiency of the power supply / module by optimizing the load distribution and power supply strategy, so as to achieve the purpose of energy conservation and emission reduction and improve the overall performance of the system. Specifically, first, the possible load demand range is divided into multiple subdivided intervals. These intervals are carefully designed based on the performance characteristics of the power supply / module, with the aim of ensuring that the system can operate in the most efficient manner at each specific power demand level. The design purpose of each load power interval is to maximize the conversion efficiency of the power supply / module. Conversion efficiency generally refers to the ratio of input electrical energy converted into useful output electrical energy. The higher the efficiency, the less energy loss and the better the system performance. For each determined load power interval, there is a corresponding power supply mode, which is a preset operating strategy, including but not limited to parameter settings such as the switching frequency, operating voltage, and current control of the power supply. This mode ensures that the conversion efficiency of the power supply / module working in this interval can meet the maximum requirement.

[0045] The design of the load power range in this embodiment ensures that the system can operate at the highest efficiency under various load conditions, thereby reducing energy waste.

[0046] In a preferred embodiment of the present invention, the load rate when the conversion efficiency of the power supply / module is maximized is λ, the parallel DC power supply system includes N power supplies / modules with a rated power of P, and the load power range is 0~N·P, then the load power range includes:

[0047] The first load power range , the second load power range and the third load power interval ,in, is the power supply / module rated power, is the load power, and N is the number of power supplies / modules.

[0048] The load rate at which the conversion efficiency is maximized in this embodiment refers to the energy conversion efficiency of the power supply / module reaching the highest value at a certain load rate. Conversion efficiency generally involves the ratio of input power to output power, and high efficiency means more adequate energy utilization and less loss. The first load power interval divided corresponds to a light load state, that is, λ is low, close to the starting point where the conversion efficiency of the power supply / module begins to improve. At this time, by properly controlling the load, the inefficiency caused by too light a load can be avoided. The second load power interval is the area where the conversion efficiency reaches the peak, that is, λ is at an ideal value, the power supply / module works in the best state, and the conversion efficiency is the highest. The third load power interval is an overload prevention interval. Although the load power here has not exceeded the total rated power NP of all modules, it has exceeded the total power of all modules in the state of maximum efficiency. In this interval, although the system can still provide the necessary power, the conversion efficiency of the power supply / module may have begun to decline, and it is necessary to increase heat dissipation, dynamically adjust power allocation, etc. to avoid overheating and further reduction in efficiency.

[0049] According to the load power range design proposed in this embodiment, the working state of the power supply / module can be dynamically adjusted according to the actual load conditions. For example, through a load balancing strategy, it is ensured that the load of each module is as close to λ as possible, thereby maintaining efficient operation at the entire system level.

[0050] In a preferred embodiment of the present invention, the power supply modes corresponding to the three load power intervals proposed in the above embodiment include:

[0051] The first power supply mode, in which only one power supply / module is in a power supply state.

[0052] In this mode, only one power supply / module is enabled to meet the current load demand. This is usually suitable for light load or low power consumption situations, which can reduce energy consumption and system complexity, and may help extend the life of other unused power supplies / modules.

[0053] The second power supply mode, in which M power supplies / modules are in power supply state, , where Represents the ceiling operator.

[0054] In this mode, M power supplies / modules are activated to supply power together. Here, the value of M is obtained by dividing the current load power by the rated power maximum conversion efficiency of a single power supply / module and rounding up to ensure sufficient power supply. The rounding up operation ensures that even if the load slightly exceeds the processing capacity of a power supply / module, an additional power supply / module can be added to meet the demand to avoid overloading a single module.

[0055] In the third power supply mode, all power supplies / modules are in power supply state.

[0056] In this mode, all available power supplies / modules will be activated to provide the maximum possible power supply capacity. This mode ensures that the system can maintain stable operation when facing extreme or peak loads, but may sacrifice some energy efficiency because not all modules are operating at their most efficient operating point.

[0057] This embodiment achieves dynamic response to different load conditions by flexibly adjusting the power supply mode, which can not only meet the energy-saving requirements under light load, but also cope with the power supply challenges under high load. By selecting a reasonable power supply mode, the system can find the best balance between efficiency, stability and life.

[0058] In a preferred embodiment of the present invention, the first power supply mode and the second power supply mode further include a power supply / module in hot standby state.

[0059] In a preferred embodiment of the present invention, the load rate is set to 30%. Based on this, the three load power intervals and corresponding power supply modes are as follows:

[0060] R1: , a single power supply / module is used for power supply, and other power supplies / modules are used for hot standby;

[0061] In the R1 range, the power supply / module adopts the power control method of formula (2), and the coefficient , ; Other power supplies / modules are in hot standby mode, that is, their internal parallel switches are disconnected, and the power supplies / modules continue to work, using the power control method in the improved droop control, and the coefficient , ;in, , Preset values ​​for the droop factor and the temperature adjustment factor respectively.

[0062] R2: , M power supplies / modules are used for power supply, and other power supplies / modules are used for hot standby;

[0063] In the R2 section, the number of power supplies / modules is M. , where “.” is the round-up operator. The power supply / module adopts the power control method of formula (2), and the coefficients are all , ; Other power supplies / modules are in hot standby mode, that is, their internal parallel switches are disconnected, and the power supplies / modules continue to work, using the power control method in the improved droop control, and the coefficient , .

[0064] R3: , so the power supply / module is powered.

[0065] R3 range, so the power supply / module adopts the power control method of formula (2), and the coefficients are all , .

[0066] R3 range, so the power supply / module adopts the power control method in the improved droop control, and the coefficients are all , .

[0067] In a preferred embodiment of the present invention, an improved calculation formula of the droop control method is proposed. The traditional droop control is shown in formula (1):

[0068]

[0069] in, is the output voltage of a single power supply / module, is the open circuit output voltage of the power supply / module, is the droop coefficient, is the output current of the power supply / module.

[0070] The temperature influence factor is introduced into the droop control, and the improved droop control is shown in formula (2):

[0071]

[0072] in, is the output voltage of a single power supply / module, is the open circuit output voltage of the power supply / module, is the droop coefficient, is the output current of the power supply / module, is the power supply / module internal heat sink temperature, is the initial temperature of the internal heat sink when the power supply / module is turned on. is the temperature adjustment coefficient.

[0073] The schematic diagram of the improved droop control method is shown in Figure 2 As shown, the blue solid line and the red solid line are the power control (output characteristic) curves of power supply / module 1 and power supply / module 2 when they are turned on. As the temperature of the internal heat sinks of the two power supplies / modules increases, the power control curves of power supply / module 1 and power supply / module 2 become blue dotted lines and red dotted lines respectively. Due to the different loads of the two power supplies / modules and other factors that affect the temperature rise, the changes in the slopes of the power control curves of the two power supplies / modules are different, and the slope of power supply / module 1 is greater than that of power supply / module 2. From the deviation of the output current, it can be seen that the output current of power supply / module 1 and power supply / module 2 is , becomes , , the output current difference between the two power supplies / modules becomes smaller.

[0074] This embodiment introduces a temperature influence factor into the droop control, adjusts the droop slope of the power supply / module at different radiator temperatures, and thus balances the thermal stress between the power supplies / modules. Compared with the traditional droop control method, the temperature influence factor is introduced to adjust the droop slope of the power supply / module at different radiator temperatures, thereby balancing the thermal stress between the power supplies / modules. This method takes into account the impact of temperature on the reliability of the power supply / module, thereby improving the stability of the entire parallel system.

[0075] Based on the same inventive concept, the embodiment of the present application also provides a DC power optimization control device for a multi-port energy converter for implementing the DC power optimization control method for the multi-port energy converter involved above. The implementation scheme for solving the problem provided by the system is similar to the implementation scheme recorded in the above method, so the specific limitations in the DC power optimization control device embodiment of the multi-port energy converter provided below can be referred to the limitations of the DC power optimization control method for the multi-port energy converter above, and will not be repeated here.

[0076] See also Figure 3 This embodiment provides a DC power optimization control device for a multi-port energy converter, comprising:

[0077] A selection module is used to select a power supply mode corresponding to the current load power range according to the corresponding relationship between the load power range and the power supply mode. The load power range includes several adjacent load power intervals. The power supply mode specifies the power supply state configuration of the power supply / module when the load power demand in the corresponding power interval is met;

[0078] The control module is used to supply power in the selected power supply mode, and adopts an improved droop control method to control the power supply / module in the power supply state to balance the thermal stress between each power supply / module. The improved droop control method is to introduce a temperature influence factor into the droop coefficient term of the droop control method to reflect the influence of temperature change on droop control.

[0079] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0080] Reference Figure 4 The embodiment of the present invention further provides a computer device 40, comprising: a memory 402 and a processor 401 and a computer program 403 stored in the memory 402. When the computer program 403 is executed on the processor 401, a DC power optimization control method for a multi-port energy converter as described in any one of the above methods is implemented.

[0081] The computer device 40 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The computer device 40 may include, but is not limited to, a processor 401 and a memory 402. Those skilled in the art will appreciate that Figure 4 This is merely an example of the computer device 40 and does not constitute a limitation on the computer device 40 . The computer device 40 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, etc.

[0082] The processor 401 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0083] In some embodiments, the memory 402 may be an internal storage unit of the computer device 40, such as a hard disk or memory of the computer device 40. In other embodiments, the memory 402 may also be an external storage device of the computer device 40, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device 40. Further, the memory 402 may also include both an internal storage unit of the computer device 40 and an external storage device. The memory 402 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program, etc. The memory 402 may also be used to temporarily store data that has been output or is to be output.

[0084] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for optimizing direct current power control of a multi-port energy converter as described in any one of the above methods is implemented.

[0085] In this embodiment, if the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, USB flash drive, mobile hard disk, disk or optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0088] In the embodiments disclosed in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A DC power optimization control method for a multi-port energy converter, characterized in that: The steps include: Determine the power supply mode corresponding to the current load power range according to the corresponding relationship between the load power range and the power supply mode, wherein the load power range includes a plurality of adjacent load power intervals, and the power supply mode specifies the power supply state configuration of the power supply / module when the load power demand within the corresponding power interval is met; Power is supplied in the determined power supply mode, and the power supply / module in the power supply state is controlled by an improved droop control method to balance the thermal stress between each power supply / module. The improved droop control method introduces a temperature influence factor into the droop coefficient term of the droop control method to reflect the influence of temperature change on droop control.

2. The DC power optimization control method of a multi-port energy converter according to claim 1, characterized in that: The load power range is composed of several load power intervals that maximize the conversion efficiency of the power supply / module. In each of the load power intervals, the conversion efficiency of the power supply / module in the power supply state in the corresponding power supply mode meets the maximum requirement.

3. The DC power optimization control method of a multi-port energy converter according to claim 1, characterized in that: The load rate when the conversion efficiency of the power supply / module is maximized is λ, and the load power range includes: The first load power range , the second load power range and the third load power interval ,in, is the power supply / module rated power, is the load power, and N is the number of power supplies / modules.

4. The DC power optimization control method of a multi-port energy converter according to claim 3, characterized in that: The corresponding power supply modes include: A first power supply mode, in which only one power supply / module is in a power supply state; The second power supply mode, in which M power supplies / modules are in power supply state, , where Represents the ceiling operator; In the third power supply mode, all power supplies / modules are in power supply state.

5. The DC power optimization control method of a multi-port energy converter according to claim 4, characterized in that: The first power supply mode and the second power supply mode also include a power supply / module in hot standby state.

6. The DC power optimization control method of a multi-port energy converter according to claim 3, characterized in that: The load rate is set to 30%.

7. The DC power optimization control method of a multi-port energy converter according to claim 1, characterized in that: The improved droop control method is controlled according to the following formula: In the formula, is the output voltage of a single power supply / module, is the open circuit output voltage of the power supply / module, is the droop coefficient in the droop coefficient term, is the output current of the power supply / module, is the power supply / module internal temperature, is the initial internal temperature when the power supply / module is turned on. is the temperature regulation coefficient, is regarded as the temperature influencing factor.

8. A DC power optimization control device for a multi-port energy converter, characterized in that: include: A selection module, configured to select a power supply mode corresponding to a current load power range according to a correspondence between a load power range and a power supply mode, wherein the load power range includes a plurality of adjacent load power intervals, and the power supply mode specifies a power supply state configuration of a power source / module when a load power requirement within a corresponding power interval is met; The control module is used to supply power in the selected power supply mode, and adopt an improved droop control method to control the power supply / module in the power supply state to balance the thermal stress between each power supply / module. The improved droop control method introduces a temperature influence factor into the droop coefficient term on the basis of traditional droop control to reflect the influence of temperature change on droop control.

9. A computer device, characterized in that: The device comprises a processor and a memory: The memory is used to store a computer program and send instructions of the computer program to the processor; The processor executes a DC power optimization control method for a multi-port energy converter according to any one of claims 1-7 according to the instructions of the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a DC power optimization control method for a multi-port energy converter according to any one of claims 1 to 7 is implemented.

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