Power supply system control method, power supply system and server

Abstract

A power supply system control method, a power supply system and a server belong to the technical field of frequency converters. By arranging an adjustable capacitor group between a first-stage converter and a second-stage converter, bus voltage fluctuations caused by load changes can be effectively smoothed. By real-time acquisition of operating parameters and calculation of the load change rate, combined with the load demand in the next operating cycle calculated by the server, a first cycle of the operation of the first-stage converter and a second cycle of the operation of the second-stage converter are dynamically adjusted, so that the power supply system can adapt to the load changes in time, so as to solve the problems of voltage fluctuations, low resource utilization and poor reliability in a power supply system including a first-stage converter and a second-stage converter cascaded front and back in a dynamic load scenario.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular, relates to a power supply system control method, a power supply system and a server. Background Art

[0002] In modern power supply systems, the two-stage converter cascade architecture is widely used for load power supply. Its working mode is usually to generate the intermediate bus voltage through the first-stage converter, and then the second-stage converter converts the intermediate bus voltage into the low-voltage output required by the load. In order to achieve power decoupling between the front and rear converters, capacitors are usually set on the intermediate bus to absorb the power difference between the two-stage converters and reduce the intermediate bus voltage fluctuation, thereby providing a stable input voltage for the second-stage converter. However, since the load's demand for power supply changes over time and the second-stage converter is composed of multiple parallel sub-modules, the decoupling method through fixed capacitors cannot eliminate the problem of voltage fluctuations. Especially in dynamic load scenarios, once the allocation strategy for multiple sub-modules is incorrect, it will lead to low resource utilization and reduce the reliability of the power supply system. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a power supply system control method, a power supply system and a server, which aim to solve the problems of voltage fluctuation, low resource utilization and poor reliability in dynamic load scenarios in the traditional technical solution, in which the power supply system including a first-stage converter and a second-stage converter cascaded in series has voltage fluctuations.

[0004] A first aspect of an embodiment of the present application provides a power system control method, which is applicable to a power system including a first-stage converter and a second-stage converter cascaded in series, wherein an adjustable capacitor group is provided between the first-stage converter and the second-stage converter, the second-stage converter includes a plurality of sub-modules connected in parallel, the first-stage converter operates in a first cycle, and the second-stage converter operates in a second cycle; the power system control method includes:

[0005] Collect the operating parameters of the current operating cycle of the power supply system, calculate the load change rate based on the operating parameters and send the operating parameters to the server;

[0006] According to the load change rate, the capacitance value of the adjustable capacitor bank is adjusted to smooth the fluctuation of the bus voltage;

[0007] receiving a load demand in a next operation cycle predicted by the server based on the operation parameters;

[0008] According to the load change rate and load demand, the first cycle and the second cycle are dynamically adjusted to match the load demand.

[0009] In one embodiment, the operating parameters of the power supply system include: a first operating state of the first-stage converter, a capacitance state of the adjustable capacitor group, a second operating state of the second-stage converter, and a load state.

[0010] In one embodiment, the load state includes a load power value, and calculating the load change rate based on the operating parameters includes:

[0011] Based on the load power values ​​collected during the current operation cycle, the average change rate of the load power during the current operation cycle is calculated.

[0012] In one embodiment, adjusting the capacitance value of the adjustable capacitor group according to the load change rate includes:

[0013] When the load change rate is greater than a preset first change rate threshold, a first capacity of the capacitor to be increased is calculated according to the load change rate, and a capacitance value of the adjustable capacitor group is increased based on the first capacity;

[0014] When the load change rate is less than a preset second change rate threshold, the second capacity of the capacitor to be reduced is calculated according to the load change rate, and the capacitance value of the adjustable capacitor group is reduced based on the second capacity.

[0015] In one embodiment, dynamically adjusting the first period and the second period according to the load change rate and the load demand includes:

[0016] When the load change rate is greater than a preset first change rate threshold, and / or the power required by the load is greater than a preset power value, shortening the first period;

[0017] When the load change rate is less than a preset second change rate threshold, and / or the power required by the load is less than a preset power value, the second period is increased.

[0018] In one embodiment, the adjustment amounts of the first cycle and the second cycle are proportional to the load change rate and the load required power.

[0019] In one embodiment, each submodule of the second-stage converter is independently connected to the output end of the adjustable capacitor group and connected to the load through the power conversion unit inside each submodule; the second operating state includes the working state of each submodule, and the power control method further includes:

[0020] Based on the load demand and the working status of each submodule, the working mode of each submodule is dynamically switched.

[0021] In one embodiment, the working status of the submodule includes: whether it is enabled and the output power size.

[0022] A second aspect of the present application provides a power supply system, comprising a first-stage converter and a second-stage converter cascaded in series, an adjustable capacitor group being arranged between the first-stage converter and the second-stage converter, the second-stage converter comprising a plurality of sub-modules connected in parallel, the first-stage converter operating in a first cycle, and the second-stage converter operating in a second cycle;

[0023] The power supply system further includes: a control module, the control module being used to: collect operating parameters of the current operating cycle of the power supply system, calculate the load change rate based on the operating parameters and send the operating parameters to the server;

[0024] According to the load change rate, the capacitance value of the adjustable capacitor bank is adjusted to smooth the fluctuation of the bus voltage;

[0025] receiving a load demand in a next operation cycle predicted by the server based on the operation parameters;

[0026] According to the load change rate and the load demand, the first cycle and the second cycle are dynamically adjusted to match the load demand.

[0027] The third aspect of the present application provides a server, which is communicatively connected to the power supply system described in the second aspect of the present application, and is used to receive operating parameters transmitted by the power supply system, predict the load demand in the next operating cycle based on the operating parameters, and send the load demand to the power supply system, so that the power supply system can dynamically adjust the first cycle of operation of the first-stage converter and the second cycle of operation of the second converter according to the load change rate and load demand, wherein the operating parameters include the operating parameters of the current operating cycle collected by the power supply system, and the load change rate is calculated by the power supply system based on the operating parameters.

[0028] The beneficial effects of the embodiments of the present application are as follows: by setting an adjustable capacitor group between the first-stage converter and the second-stage converter, the bus voltage fluctuation caused by load changes can be effectively smoothed, and by real-time collection of operating parameters and calculation of the load change rate, combined with the load demand in the next operating cycle calculated by the server, the first cycle of the operation of the first-stage converter and the second cycle of the operation of the second-stage converter are dynamically adjusted, so that the power supply system can adapt to the load changes in time, so as to solve the problems of voltage fluctuation, low resource utilization and poor reliability in the power supply system including the first-stage converter and the second-stage converter cascaded in a dynamic load scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic diagram of the structure of a power supply system provided in one embodiment of the present application;

[0031] Figure 2 A flowchart of a power system control method provided in one embodiment of the present application;

[0032] Figure 3 A schematic diagram of the structure of a second-stage converter provided in one embodiment of the present application;

[0033] Figure 4 A flowchart of a power system control method provided in another embodiment of the present application. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multi-frame" refers to more than two (including two).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] The present application embodiment provides a power system control method, which is applicable to a power system including a first-stage converter and a second-stage converter cascaded in series. For example, Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a power supply system provided in one embodiment of the present application. Figure 1 It can be seen that the power supply system provided in the embodiment of the present application includes a first-stage converter 100, a second-stage converter 101, an adjustable capacitor group 102 and a control module 103. Among them, an adjustable capacitor group 102 is arranged between the first-stage converter 100 and the second-stage converter 101, the second-stage converter 101 includes a plurality of parallel submodules 1011, the first-stage converter 100 operates in a first cycle, and the second-stage converter 101 operates in a second cycle. The control module 103 is used to collect the operating parameters of the current operating cycle of the power supply system, calculate the load change rate based on the operating parameters and send the operating parameters to the server; according to the load change rate, adjust the capacitance value of the adjustable capacitor group to smooth the fluctuation of the bus voltage; receive the load demand in the next operating cycle predicted by the server based on the operating parameters; according to the load change rate and the load demand, dynamically adjust the first cycle and the second cycle to match the load demand.

[0042] From the above analysis, it can be known that the power supply system provided in the embodiment of the present application includes a first-stage converter and a second-stage converter cascaded front and back. By setting an adjustable capacitor group between the first-stage converter and the second-stage converter, the bus voltage fluctuation caused by load changes can be effectively smoothed, and the operating parameters are collected in real time and the load change rate is calculated. In combination with the load demand in the next operating cycle calculated by the server, the first cycle of the operation of the first-stage converter and the second cycle of the operation of the second-stage converter are dynamically adjusted, so that the power supply system can adapt to the load changes in time, so as to solve the problems of voltage fluctuation, low resource utilization and poor reliability in the power supply system including the first-stage converter and the second-stage converter cascaded front and back in dynamic load scenarios.

[0043] Specifically, Figure 2 As shown, Figure 2 A schematic diagram of a flow chart of a power system control method provided in an embodiment of the present application. Figure 2 It can be seen that the power system control method provided in the embodiment of the present application includes:

[0044] S201: Collect operating parameters of the current operating cycle of the power supply system, calculate the load change rate based on the operating parameters, and send the operating parameters to the server.

[0045] In one embodiment, the operating parameters of the power supply system include: a first operating state of the first-stage converter, a capacitance state of the adjustable capacitor group, a second operating state of the second-stage converter, and a load state.

[0046] Among them, the first-stage converter mainly performs preliminary adjustments on the input power supply to ensure the compatibility and stability of the power input, and the second-stage converter optimizes and adapts the power at the load end to provide high-quality power supply services. The first operating state includes input voltage, input current, output voltage and the first cycle; the capacitor state includes the current capacitance value and the terminal voltage of the capacitor group; the second operating state includes the enabling state of each submodule, the power output of each submodule and the second cycle; the load state includes the load power value. By sending the above-mentioned operating parameters to the server, the server can perform load requirements in the next operating cycle based on the operating parameters. Specifically, the server can analyze each operating parameter based on a pre-trained machine learning model to obtain the load demand in the next operating cycle. The embodiment of the present application does not specifically limit the server prediction process.

[0047] In one embodiment, the load state includes a load power value, and calculating the load change rate based on the operating parameters includes: calculating an average change rate of the load power in the current operating cycle based on each of the load power values ​​collected in the current operating cycle.

[0048] Specifically, the average rate of change of load power during the current operation cycle can be calculated by the following formula:

[0049]

[0050] in, is the sampling time interval, N-1 is the total number of changes, Indicates i The power change rate of the subsample.

[0051] The average rate of change of load power can reflect the dynamic characteristics of the load within a cycle. A large value indicates that the load power fluctuates violently, requiring the power system to have a fast response capability. The smaller the value, the more stable the load power is, and the submodules of the second-stage converter can be optimized to improve the efficiency.

[0052] S202: According to the load change rate, adjust the capacitance value of the adjustable capacitor group to smooth the fluctuation of the bus voltage.

[0053] In one embodiment, the capacitance value of the adjustable capacitor group is adjusted according to the load change rate, including: when the load change rate is greater than a preset first change rate threshold, a first capacity of the capacitor required to be increased is calculated according to the load change rate, and the capacitance value of the adjustable capacitor group is increased based on the first capacity; when the load change rate is less than a preset second change rate threshold, a second capacity of the capacitor required to be reduced is calculated according to the load change rate, and the capacitance value of the adjustable capacitor group is reduced based on the second capacity.

[0054] Specifically, the first capacity of the capacitor required to be increased is calculated according to the load change rate, which can be expressed as:

[0055]

[0056] in, It is the adjustment coefficient, which determines the sensitivity of increasing the capacitor. It is mainly used to enhance the transient response capability of the power supply system and provide sufficient energy storage buffer during rapid load fluctuations. is the current load change rate.

[0057] The second capacity of the capacitor that needs to be reduced is calculated based on the load change rate and can be expressed as:

[0058]

[0059] in, It is the adjustment coefficient, which determines the sensitivity of reducing the capacitor. It is mainly used to optimize the energy utilization efficiency of the system and avoid losses caused by excessive energy storage.

[0060] In practical applications, ， It needs to be designed based on the system response time and load fluctuation characteristics. The values ​​of the two need to quickly suppress bus voltage fluctuations, meet the stability requirements of the power supply system, reduce unnecessary energy storage losses, and improve the operating efficiency of the power supply system.

[0061] For example, The initial value of can be expressed as: , The initial value of can be expressed as: ;in, represents the maximum permissible capacitance increment, Indicates the minimum permissible capacitance reduction, and are the maximum and minimum values ​​of the load change rate respectively. It should be noted that according to the load fluctuation of the power system, and The value of is adaptively adjusted to ensure that the power system stability requirements are met.

[0062] S203: Receive the load demand in the next operation cycle predicted by the server based on the operation parameters.

[0063] Specifically, the server can analyze the operating parameters and predict the load demand in the next operating cycle based on the analysis results. The server performs load demand prediction to improve the prediction efficiency and the response speed of the power supply system. The embodiment of the present application does not specifically limit the process of the server predicting the load demand in the next operating cycle based on the operating parameters.

[0064] S204: Dynamically adjust the first cycle and the second cycle according to the load change rate and the load demand to match the load demand.

[0065] In one embodiment, the first period and the second period are dynamically adjusted according to the load change rate and the load demand, including: when the load change rate is greater than a preset first change rate threshold, and / or the power required by the load is greater than a preset power value, shortening the first period; when the load change rate is less than a preset second change rate threshold, and / or the power required by the load is less than the preset power value, increasing the second period.

[0066] In one embodiment, the adjustment amounts of the first cycle and the second cycle are proportional to the load change rate and the load required power.

[0067] Exemplarily, the shortened first cycle can be expressed as:

[0068]

[0069] in, represents the first cycle after shortening, Indicates the current first cycle, ,

[0070] They are adjustment coefficients, which are used to control the magnitude of shortening the first cycle. Indicates the load change rate, represents the first change rate threshold, Indicates the power required by the load, Indicates the preset power value.

[0071] The increase in the second cycle after the increase can be expressed as:

[0072]

[0073] in, represents the second cycle after the increase, Indicates the current second cycle, , They are adjustment coefficients, which are used to control the amplitude of the increase in the second cycle. Indicates the second rate of change threshold.

[0074] By dynamically adjusting the first cycle and the second cycle, the system performance can be optimized to meet the load requirements while improving the stability and efficiency of the power supply system.

[0075] In one embodiment, if Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a power supply system provided by another embodiment of the present application. Figure 3 It can be seen that each submodule 1011 of the second-stage converter 101 is independently connected to the output end of the adjustable capacitor group 102, and is connected to the load through its own internal power conversion unit 1012. The design of each submodule being independently connected can improve the reliability and flexibility of the system, and the electric energy provided by the adjustable capacitor group can be independently allocated according to the needs of each submodule, avoiding the competition for resources in the energy allocation process.

[0076] In one embodiment, the second operating state includes the working state of each submodule. Through the working state of each submodule, the working mode of each submodule can be dynamically switched.

[0077] like Figure 4 As shown, Figure 4 A schematic diagram of a flow chart of a power control method provided in another embodiment of the present application. Figure 2 Compared with the power control method provided in the embodiment, the specific implementation process of S401 to S404 is the same as that of S201 to S204, except that S405 is further included after S404, which is described in detail as follows:

[0078] S401: Collect operating parameters of the current operating cycle of the power supply system, calculate the load change rate based on the operating parameters, and send the operating parameters to the server.

[0079] S402: According to the load change rate, adjust the capacitance value of the adjustable capacitor group to smooth the fluctuation of the bus voltage.

[0080] S403: Receive the load demand in the next operation cycle predicted by the server based on the operation parameters.

[0081] S404: Dynamically adjust the first cycle and the second cycle according to the load change rate and the load demand to match the load demand.

[0082] S405: Dynamically switch the working mode of each submodule based on the load demand and the working status of each submodule.

[0083] According to the load demand and the working state of each submodule, the working mode of each submodule can be dynamically switched to optimize the efficiency and stability of the power supply system. In one embodiment, the working state of the submodule includes: whether it is enabled and the output power size.

[0084] The working modes include: buck mode, boost mode, standby mode, PWM control mode or rectification mode, etc. By determining the working mode of each submodule based on the load demand and the working status of each submodule, the efficiency, response speed and stability of the system can be significantly improved.

[0085] From the above analysis, it can be seen that the embodiment of the present application provides a power supply system, which can effectively smooth the bus voltage fluctuations caused by load changes by setting an adjustable capacitor group between the first-stage converter and the second-stage converter, and dynamically adjust the first cycle of the first-stage converter and the second cycle of the second-stage converter by collecting operating parameters in real time and calculating the load change rate, combined with the load demand in the next operating cycle calculated by the server, so that the power supply system can adapt to load changes in time to solve the problems of voltage fluctuations, low resource utilization and poor reliability in the power supply system including the first-stage converter and the second-stage converter cascaded front and back in dynamic load scenarios.

[0086] In addition, an embodiment of the present application also provides a server, which is communicatively connected to the power supply system provided in the above embodiment, and is used to receive operating parameters transmitted by the power supply system, predict the load demand in the next operating cycle based on the operating parameters, and send the load demand to the power supply system, so that the power supply system can dynamically adjust the first cycle of operation of the first-stage converter and the second cycle of operation of the second converter according to the load change rate and load demand, wherein the operating parameters include the operating parameters of the current operating cycle collected by the power supply system, and the load change rate is calculated by the power supply system based on the operating parameters.

[0087] Specifically, the power supply system provided in the present application is communicatively connected to a server, and the operating parameters in a current operating cycle are analyzed by the server. The load demand in the next operating cycle is predicted based on the analysis of the operating parameters in the current operating cycle, and then the first cycle of the operation of the first-stage converter and the second cycle of the operation of the second-stage converter are dynamically adjusted to improve the ability of the power supply to adapt to load changes.

[0088] The beneficial effects of the embodiments of the present application are as follows: by setting an adjustable capacitor group between the first-stage converter and the second-stage converter, the bus voltage fluctuation caused by load changes can be effectively smoothed, and by real-time collection of operating parameters and calculation of the load change rate, combined with the load demand in the next operating cycle calculated by the server, the first cycle of the operation of the first-stage converter and the second cycle of the operation of the second-stage converter are dynamically adjusted, so that the power supply system can adapt to the load changes in time, so as to solve the problems of voltage fluctuation, low resource utilization and poor reliability in the power supply system including the first-stage converter and the second-stage converter cascaded in a dynamic load scenario.

[0089] 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 actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device 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 embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. 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.

[0090] 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.

[0091] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 application, and should all be included in the protection scope of the present application.

Claims

1. A power system control method, applicable to a power system including a first-stage converter and a second-stage converter cascaded in series, characterized in that: An adjustable capacitor group is provided between the first-stage converter and the second-stage converter, the second-stage converter includes a plurality of submodules connected in parallel, the first-stage converter operates in a first cycle, and the second-stage converter operates in a second cycle; the control method includes: Collecting operating parameters of the current operating cycle of the power supply system, calculating the load change rate based on the operating parameters and sending the operating parameters to the server; According to the load change rate, adjusting the capacitance value of the adjustable capacitor group to smooth the fluctuation of the bus voltage; receiving a load demand of the server in a next operation cycle predicted based on the operation parameters; According to the load change rate and the load demand, the first period and the second period are dynamically adjusted to match the load demand.

2. The power system control method according to claim 1, characterized in that: The operating parameters of the power supply system include: a first operating state of the first-stage converter, a capacitance state of the adjustable capacitor group, a second operating state of the second-stage converter, and a load state.

3. The power system control method according to claim 2, characterized in that: The load state includes a load power value, and the calculating the load change rate based on the operating parameters includes: Based on the load power values ​​in the current operation cycle, an average change rate of the load power in the current operation cycle is calculated.

4. The power system control method according to claim 3, characterized in that: The adjusting the capacitance value of the adjustable capacitor group according to the load change rate includes: When the load change rate is greater than a preset first change rate threshold, calculating a first capacity of the capacitor to be increased according to the load change rate, and increasing the capacitance value of the adjustable capacitor group based on the first capacity; When the load change rate is less than a preset second change rate threshold, a second capacity of the capacitor to be reduced is calculated according to the load change rate, and the capacitance value of the adjustable capacitor group is reduced based on the second capacity.

5. The power system control method according to claim 1, characterized in that: The dynamically adjusting the first period and the second period according to the load change rate and the load demand includes: When the load change rate is greater than a preset first change rate threshold, and / or the power required by the load is greater than a preset power value, shortening the first period; When the load change rate is less than a preset second change rate threshold, and / or the power required by the load is less than a preset power value, the second period is increased.

6. The power system control method according to claim 5, characterized in that: The adjustment amounts of the first cycle and the second cycle are respectively proportional to the load change rate and the power required by the load.

7. The power system control method according to claim 2, characterized in that: Each of the submodules of the second-stage converter is independently connected to the output end of the adjustable capacitor group and connected to the load through the power conversion unit inside each of them; the second operating state includes the working state of each of the submodules, and the control method further includes: Based on the load demand and the working state of each submodule, the working mode of each submodule is dynamically switched.

8. The power system control method according to claim 7, characterized in that: The working status of the submodule includes: whether it is enabled and the output power size.

9. A power supply system, comprising a first-stage converter and a second-stage converter connected in cascade, characterized in that: An adjustable capacitor group is provided between the first-stage converter and the second-stage converter, the second-stage converter includes a plurality of submodules connected in parallel, the first-stage converter operates in a first cycle, and the second-stage converter operates in a second cycle; The power supply system further includes: a control module, wherein the control module is used to: Collecting operating parameters of the current operating cycle of the power supply system, calculating the load change rate based on the operating parameters and sending the operating parameters to the server; According to the load change rate, adjusting the capacitance value of the adjustable capacitor group to smooth the fluctuation of the bus voltage; receiving a load demand of the server in a next operation cycle predicted based on the operation parameters; According to the load change rate and the load demand, the first period and the second period are dynamically adjusted to match the load demand.

10. A server, characterized in that: The server is communicatively connected to the power supply system described in claim 9, and is used to receive operating parameters transmitted by the power supply system, predict load demand in the next operating cycle based on the operating parameters, and send the load demand to the power supply system so that the power supply system can dynamically adjust the first cycle of operation of the first-stage converter and the second cycle of operation of the second-stage converter according to the load change rate and the load demand, wherein the operating parameters include the operating parameters of the current operating cycle collected by the power supply system, and the load change rate is calculated by the power supply system based on the operating parameters.

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