Carrier phase shift dynamic distribution method and system of modular multilevel converter

Abstract

The invention provides a carrier phase shift dynamic allocation method and system of a modular multilevel converter, which can identify the number and position of fault modules, calculate the phase shift stepping value of symmetrical carrier phase shift in real time, and reconstruct the mapping relation between sub-modules and carriers, so that a controller realizes dynamic carrier allocation, and the dynamic allocation efficiency of the carrier phase shift of the modular multilevel converter is improved. Even in a redundant mode, symmetry of carrier waves can be realized, and switching frequency is equivalently improved, so that current and voltage ripples are reduced, the problems of non-uniform carrier wave distribution and disappearance of frequency equivalent multiplication effect caused by bypass of a fault module of an existing modular multilevel converter are solved, the overall performance and electric energy quality of a power system are improved, and the service life of the power system is prolonged. Dynamic changes of health states of the modules can be adapted in real time, synchronization among the modules is kept, the efficiency of a power system is improved, harmonic distortion is reduced, and the reliability and adaptability of the modular multilevel converter and the overall performance of the power system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power systems and relates to a carrier allocation method and system for a modular multilevel converter. Background Art

[0002] Modular multilevel converters are widely used in complex power system fields such as high-voltage DC power transmission, ship integrated power systems, and new energy grid connection due to their modular topologies and flexible expandability. By cascading multiple power modules, modular multilevel converters achieve power conversion at high voltage and current levels, significantly improving the power density and reliability of the system. In addition, the modular design enables the complex power systems in which they are applied to have good redundancy and maintainability, and can continue to operate stably when some modules fail, meeting the high-reliability requirements of complex power systems.

[0003] With the development of power electronics technology, the application scope of modular multilevel converters is continuously expanding, and the requirements for carrier allocation strategies are also getting higher and higher. In modern power systems, modular converters not only need to have efficient energy conversion capabilities, but also need to have fast response and high flexibility to adapt to complex and changing load and grid environments. However, with the increase in the number of modules and the improvement of system complexity, modular multilevel converters face many challenges in practical applications. First, when a converter module fails and is bypassed, the asymmetry of carrier allocation in traditional carrier allocation methods may cause the disappearance of the switching frequency equivalent doubling effect. This frequency equivalent doubling effect helps to disperse switching noise and reduce electromagnetic interference during normal operation. The disappearance of the frequency equivalent doubling effect will cause a significant increase in the fundamental frequency components of the output voltage and current ripples, thereby affecting the overall performance and power quality of the power system. Second, existing carrier allocation control strategies are usually based on static configurations and are difficult to adapt to the dynamic changes in the health status of modules in real time. When the number of redundant modules in the system changes, or the working states of modules change frequently, traditional carrier allocation methods are difficult to maintain synchronization between modules, resulting in a decrease in power system efficiency and an increase in harmonic distortion. Summary of the Invention

[0004] To solve the problems that the traditional carrier allocation method of modular multilevel converters described in the background art affects the overall performance and power quality of the power system and leads to a decrease in power system efficiency and an increase in harmonic distortion, the present invention provides a carrier phase-shifting dynamic allocation method and system for modular multilevel converters.

[0005] The method of the present invention includes: Detect the module status of each sub-module in the modular multilevel converter system, and judge the healthy modules and bypassed modules; Based on the judgment results of the modules in the healthy state and the bypassed modules, count the number of modules that are currently in the healthy state and not bypassed as the number of healthy modules, and calculate the phase-shifting step value of the healthy modules; Based on the judgment results of the modules in the healthy state and the bypassed modules, cut off the faulty modules or insert redundant modules, and reassign phase-shifting numbers to all healthy modules to be inserted at the next moment. According to the phase-shifting step value of the healthy modules and in accordance with the reassigned healthy module numbers, assign carrier phase-shifting step values to each healthy module, and ensure that the output voltage and current ripples are maintained within an acceptable range.

[0006] Furthermore, the modular multilevel converter system is responsible for judging the module state, calculating the phase-shifting step value, and assigning the carrier phase-shifting step value through a central controller.

[0007] Furthermore, each sub-module in the modular multilevel converter system includes a power module and a bottom-layer controller. The bottom-layer controller is responsible for sampling the branch electrical quantities of the sub-module in real time and generating PWM pulse signals to obtain the health state information of each sub-module; The central controller is connected to the bottom-layer controllers of each sub-module through a bidirectional high-speed communication interface; the central controller receives the health state information of each sub-module obtained by the bottom-layer controller and judges the modules in the healthy state and the bypassed modules.

[0008] Furthermore, the central controller traverses each sub-module in the modular multilevel converter system, checks the PWM enable state and bypass state of each sub-module, and counts the number of modules that are currently in the healthy state and not bypassed as the number of healthy modules.

[0009] Furthermore, the calculation method of the phase-shifting step value of the healthy modules is as follows: If the number of healthy modules = 1, then the phase-shifting step value = 0; If the number of healthy modules > 1, then the phase-shifting step value = the maximum carrier count value in the bottom-layer controller / the number of healthy modules.

[0010] Furthermore, the central controller traverses each sub-module in the modular multilevel converter system. Based on the judgment results of the modules in the healthy state and the bypassed modules, cut off the faulty modules or insert redundant modules, and reassign phase-shifting numbers to all healthy modules to be inserted at the next moment. The central controller assigns carrier phase-shifting step values to each healthy module according to the reassigned phase-shifting number sequence and the phase-shifting step value of the healthy modules, and ensures that the output voltage and current ripples are maintained within an acceptable range. The healthy modules execute the assigned carrier phase-shifting step values through the bottom-layer controller.

[0011] Further, the method for allocating the carrier phase-shift step value is as follows: taking the carrier of the first healthy module as the reference carrier, its phase-shift step value is 0, and the starting value of the carrier of the subsequent healthy modules = the maximum carrier count value in the underlying controller - the number of modules × the phase-shift step value.

[0012] Based on the above method, the present invention proposes a carrier phase-shift dynamic allocation system for a modular multilevel converter, including a state detection and judgment module, a phase-shift step value calculation module, and a carrier phase-shift step value allocation module.

[0013] The state detection and judgment module is used to detect the module state of each sub-module in the modular multilevel converter system, and judge the modules in the healthy state and the bypassed modules.

[0014] The phase-shift step value calculation module is used to count the number of currently healthy and non-bypassed modules as the number of healthy modules according to the judgment results of the healthy and bypassed modules, and calculate the phase-shift step value of the healthy modules.

[0015] The carrier phase-shift step value allocation module is used to remove the faulty modules or insert the redundant modules according to the judgment results of the healthy and bypassed modules, reassign the phase-shift numbers to all the healthy modules to be inserted at the next moment, allocate the carrier phase-shift step values to each healthy module according to the phase-shift step values of the healthy modules and the reassigned healthy module numbers, and ensure that the output voltage and current ripples are maintained within an acceptable range.

[0016] The present invention also proposes an electronic device, including: a memory and a processor, which are communicatively connected to each other, the memory stores computer instructions, and the processor realizes a carrier phase-shift dynamic allocation method for a modular multilevel converter as described above by executing the computer instructions.

[0017] The present invention also proposes a computer-readable storage medium, which stores a computer program, and the computer program realizes a carrier phase-shift dynamic allocation method for a modular multilevel converter as described above when executed by a processor.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) By adopting dynamic calculation of the phase-shift step value, it is possible to count the currently inserted healthy modules in the modular multilevel converter system in each control cycle, and effectively classify and identify the healthy modules, faulty modules, and redundant modules; (2) In the step of dynamically calculating the phase-shifting step value, by allocating the carrier phase-shifting step value to each healthy module re-assigned with a phase-shifting number, the mapping relationship between the sub-module and the carrier is reconstructed, so as to achieve the averaging of carrier phase-shifting regardless of which sub-module is removed due to a fault or redundant modules are added. (3) The program is easy to maintain and can be extended to any branch. For modular multilevel converter engineering projects with different branches, the present invention can be used to achieve dynamic equal distribution of carriers.

[0019] In summary, after the faulty module in the modular multilevel converter system is bypassed, the present invention can identify the number and location of the faulty modules, calculate the phase-shifting step value of symmetric carrier phase-shifting in real time, and reconstruct the mapping relationship between the sub-module and the carrier, enabling the controller to achieve dynamic carrier allocation. Even in the redundant mode, the symmetry of the carrier can be achieved, equivalently increasing the switching frequency, thereby reducing the current and voltage ripples. The problem of uneven carrier distribution and the disappearance of the frequency equivalent doubling effect caused by bypassing the faulty module in the existing modular multilevel converter is solved, improving the overall performance and power quality of the power system. It can adapt to the dynamic changes of the module health state in real time, maintain the synchronization between modules, improve the power system efficiency, reduce the harmonic distortion, and is very beneficial to improving the reliability, adaptability of the modular multilevel converter and the overall performance of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the flowchart of the method of the present invention.

[0021] Figure 2 It is the topology structure of the modular multilevel converter of the present invention.

[0022] Figure 3 It is the hierarchical implementation architecture diagram of the central controller and the underlying controller.

[0023] Figure 4 It is the flowchart of the dynamic calculation of the phase-shifting step value.

[0024] Figure 5 It is the implementation flowchart of the allocation of the carrier phase-shifting step value.

[0025] Figure 6 It is the schematic diagram of the re-allocation of the carrier phase-shifting step value for module fault bypass.

[0026] Figure 7 It is the system architecture diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0028] Embodiment 1

[0029] A carrier phase-shift dynamic allocation method for a modular multilevel converter, the flow chart is as Figure 1 shown, and is specifically described as follows.

[0030] First, perform module state detection on each sub-module in the modular multilevel converter system, and judge the modules in the healthy state and the bypassed modules.

[0031] The topology of the modular multilevel converter is as Figure 2 shown. The modular multilevel converter system consists of N sub-modules, and each sub-module includes a power module and a bottom controller. The bottom controller can use an FPGA chip. The bottom controller is responsible for sampling the branch electrical quantities of the sub-module in real time and generating PWM pulse signals to obtain the health state information of each sub-module. The modular multilevel converter system is provided with a central controller, which can use a DSP chip. The central controller is connected to each bottom controller through a bidirectional high-speed communication interface to ensure the timely transmission of instructions and the accurate acquisition of feedback data. The central controller is responsible for the calculation of the global control strategy and the distribution of instructions. Specifically, the central controller is responsible for the judgment of the module state and the subsequent calculation of the phase-shift step value and the distribution of the carrier phase-shift step value.

[0032] Specifically, the hierarchical implementation architecture diagram of the central controller and the bottom controller is as Figure 3 shown. The central controller receives the health state information of each sub-module obtained by the bottom controller, and judges the modules in the healthy state and the bypassed modules.

[0033] Then, according to the judgment results of the modules in the healthy state and the bypassed modules, count the number of modules that are currently in the healthy state and not bypassed as the number of healthy modules, and calculate the phase-shift step value of the healthy modules.

[0034] Specifically, the central controller traverses each sub-module in the modular multilevel converter system, checks the PWM enable state and bypass state of each sub-module, and counts the number of modules that are currently in the healthy state and not bypassed as the number of healthy modules.

[0035] Specifically, the calculation method of the phase-shift step value of the healthy modules is as follows: If the number of healthy modules = 1, then the phase-shift step value = 0; If the number of healthy modules > 1, then the phase-shifting step value = the maximum carrier count value in the underlying controller / the number of healthy modules.

[0036] More specifically, as Figure 4 shown, the central controller traverses all sub-modules, counts the number of modules that are currently in a healthy state and not bypassed. First, initialize the module number i to 0 and the healthy sub-module count value N to 0. Then, the module number i = i + 1. If, when the module number i is greater than the total number of modules during operation, exit the flowchart; otherwise, enter the judgment to determine whether the current sub-module is enabled and not bypassed. If not satisfied, continue to retrieve the next module, and the module number i = i + 1; if satisfied, then the healthy module count value N is incremented by 1. After all modules are traversed, if the number of healthy modules N is equal to 1, the phase-shifting step value is set to 0; if N is not 1, then the phase-shifting step value is the maximum carrier count value in the underlying controller divided by the number of healthy modules N, ensuring that the phase-shifting angle is evenly distributed among the healthy modules and achieving symmetric distribution of the carriers.

[0037] This calculation ensures the uniform distribution of the phase-shifting step values among the healthy modules to be put into operation at the next moment, achieving symmetric distribution of the carriers.

[0038] Finally, based on the judgment results of the modules in a healthy state and the bypassed modules, cut off the faulty modules or insert redundant modules, and reassign phase-shifting numbers to all healthy modules to be put into operation at the next moment. According to the phase-shifting step values of the healthy modules and in accordance with the reassigned healthy module numbers, assign carrier phase-shifting step values to each healthy module, and ensure that the output voltage and current ripple are maintained within an acceptable range.

[0039] Specifically, the central controller traverses each sub-module in the modular multilevel converter system, cuts off the faulty modules or inserts redundant modules based on the judgment results of the modules in a healthy state and the bypassed modules, and reassigns phase-shifting numbers to all healthy modules to be put into operation at the next moment. The central controller assigns carrier phase-shifting step values to each healthy module according to the reassigned phase-shifting number order and the phase-shifting step values of the healthy modules, and ensures that the output voltage and current ripple are maintained within an acceptable range. The healthy modules execute the assigned carrier phase-shifting step values through the underlying controller. Ensure that even in the fault redundancy mode, the carriers can be evenly distributed, avoiding the disappearance of the equivalent multiple frequency caused by uneven carrier distribution and resulting in a large amount of fundamental wave components in the ripple of the output current.

[0040] Specifically, the method for assigning the carrier phase-shifting step value is: taking the carrier of the first healthy module as the reference carrier, with its phase-shifting step value being 0, and the starting value of the carrier of the subsequent healthy modules = the maximum carrier count value in the underlying controller - the number of the module × the phase-shifting step value.

[0041] More specifically, asFigure 5 As shown, the central controller traverses all sub - modules. According to the status of the current module, it cuts off the faulty module or inserts the redundant module, and re - assigns numbers to all healthy modules to be inserted at the next moment, ensuring that the numbers only include the modules to be inserted at the next moment. First, the module number i is initialized to 0, and the phase - shift number is initialized to 1. Then, the module number i = i + 1. If, when the module number i is greater than the total number N of healthy modules during operation, the flowchart exits; otherwise, it enters a judgment to determine whether the current sub - module is enabled and not bypassed. If not satisfied, it continues to search for the next module, and the module number i = i + 1. If satisfied, it determines whether the phase - shift number is 0. If satisfied, the carrier start value of the current module is 0. If not satisfied, the current module carrier start value is equal to the maximum carrier count value - the number of modules × the phase - shift step value. Finally, the phase - shift number = the phase - shift number + 1. The central processor assigns the carrier start value to the sub - modules to be inserted at the next moment, realizing the symmetric distribution of carrier phase - shift.

[0042] This step ensures that even in the fault - redundancy mode, the carriers can still be evenly distributed, avoiding the disappearance of the equivalent multiple frequency caused by uneven carrier distribution and making the ripple of the output current contain a large amount of fundamental wave components.

[0043] The modular multilevel converter system operates continuously using the above - mentioned method. The central controller periodically executes the above - mentioned method steps, adapts to the changes in the module status in real - time, and ensures that the output voltage and current ripple are maintained within an acceptable range. In each control cycle, the central controller actively performs the above operations, enabling the modular multilevel converter system to maintain the symmetric distribution of carriers online after a module fails and is bypassed or when a redundant module is inserted, improving the reliability of the modular multilevel converter system and ensuring the stable operation of the power system.

[0044] Suppose that during the normal operation of the modular multilevel converter system, there are a total of 5 sub - modules, namely module 1, module 2, module 3, module 4, and module 5. During operation, module 4 fails and is bypassed. At this time, the underlying controller detects the fault status of module 4 and marks its status as bypassed. The central controller receives the status information of the faulty module, counts the current number of healthy modules as 4, and recalculates the phase - shift step value. For example, if the carrier count value is 500, 500 divided by 4 gives a phase - shift step value of 125. Subsequently, the central controller re - assigns the carrier start values of the 4 healthy modules according to the new phase - shift step value to ensure the symmetric distribution of carriers. Finally, the central controller sends the new phase - shift step value instruction to each underlying controller. After receiving the instruction, the underlying controller adjusts the trigger order of the PWM pulses to achieve the new carrier phase - shift distribution. Through the above steps, even in the redundancy mode, the modular multilevel converter system can maintain the symmetric distribution of carriers, ensuring the stability of the power system and the power quality. The schematic diagram of the re - distribution of the carrier phase - shift step value is asFigure 6 as shown

[0045] Embodiment 2

[0046] A carrier phase-shifting dynamic allocation system for a modular multilevel converter, the architecture diagram of which is as Figure 7 shown, and it is composed of a state detection and judgment module, a phase-shifting step value calculation module, and a carrier phase-shifting step value allocation module.

[0047] The state detection and judgment module is used to detect the module state of each sub-module in the modular multilevel converter system, and judge the modules in the healthy state and the bypassed modules.

[0048] The phase-shifting step value calculation module is used to count the number of modules in the healthy state and not bypassed as the number of healthy modules according to the judgment results of the modules in the healthy state and the bypassed modules, and calculate the phase-shifting step value of the healthy modules.

[0049] The carrier phase-shifting step value allocation module is used to cut off the faulty modules or put into redundant modules and reassign the phase-shifting numbers to all healthy modules to be put into the next moment according to the judgment results of the modules in the healthy state and the bypassed modules, and allocate the carrier phase-shifting step values to each healthy module according to the phase-shifting step values of the healthy modules and the reassigned healthy module numbers, and ensure that the output voltage and current ripples are maintained within an acceptable range.

[0050] The specific implementation manners of each module in this system are the same as those described in Embodiment 1, and will not be elaborated here.

[0051] Embodiment 3

[0052] An electronic device includes: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor realizes a carrier phase-shifting dynamic allocation method for a modular multilevel converter as described in Embodiment 1 above, and a carrier phase-shifting dynamic allocation system for a modular multilevel converter as described in Embodiment 2 by executing the computer instructions.

[0053] Embodiment 4

[0054] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it realizes a carrier phase-shifting dynamic allocation method for a modular multilevel converter as described in Embodiment 1 above, and a carrier phase-shifting dynamic allocation system for a modular multilevel converter as described in Embodiment 2.

[0055] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages. For example, object-oriented programming languages such as Java, C++, Python, and interpreted scripting languages such as JavaScript, etc.

[0056] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0057] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0059] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0060] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these changes and modifications.

Claims

1. A carrier phase-shifted dynamic allocation method for a modular multilevel converter, characterized in that Comprising: Detecting the module state of each sub-module in the modular multilevel converter system, and judging the modules in a healthy state and the bypassed modules; According to the judgment results of the modules in a healthy state and the bypassed modules, counting the number of modules that are currently in a healthy state and not bypassed as the number of healthy modules, and calculating the phase-shift step value of the healthy modules; According to the judgment results of the modules in a healthy state and the bypassed modules, removing the faulty modules or inserting redundant modules and re-assigning phase-shift numbers to all healthy modules to be inserted at the next moment, and according to the phase-shift step value of the healthy modules and in accordance with the re-assigned healthy module numbers, evenly distributing the carrier phase-shift step values to each healthy module.

2. A carrier phase-shifted dynamic allocation method for a modular multilevel converter according to claim 1, characterized in that: The modular multilevel converter system is responsible for judging the module state, calculating the phase-shift step value, and distributing the carrier phase-shift step value through a central controller.

3. A carrier phase-shifted dynamic allocation method for a modular multilevel converter according to claim 2, characterized in that: Each sub-module in the modular multilevel converter system includes a power module and a bottom-layer controller, and the bottom-layer controller is responsible for sampling the branch electrical quantities of the sub-module in real time and generating PWM pulse signals to obtain the health state information of each sub-module; The central controller is connected to the bottom-layer controllers of each sub-module through a bidirectional high-speed communication interface; the central controller receives the health state information of each sub-module obtained by the bottom-layer controller and judges the modules in a healthy state and the bypassed modules.

4. A carrier phase-shifted dynamic allocation method for a modular multilevel converter according to claim 3, characterized in that: The central controller traverses each sub-module in the modular multilevel converter system, checks the PWM enable state and bypass state of each sub-module, and counts the number of modules that are currently in a healthy state and not bypassed as the number of healthy modules.

5. A carrier phase shift dynamic allocation method for a modular multilevel converter according to claim 4, characterized in that: The calculation method of the phase-shift step value of the healthy modules is as follows: If the number of healthy modules = 1, then the phase-shift step value = 0; If the number of healthy modules > 1, then the phase-shift step value = the maximum carrier count value in the bottom-layer controller / the number of healthy modules.

6. A carrier phase-shifted dynamic allocation method for a modular multilevel converter according to claim 5, characterized in that: The central controller traverses each sub-module in the modular multilevel converter system, removes the faulty modules or inserts redundant modules according to the judgment results of the modules in a healthy state and the bypassed modules, and re-assigns phase-shift numbers to all healthy modules to be inserted at the next moment. The central controller distributes the carrier phase-shift step values to each healthy module according to the phase-shift step value of the healthy modules in the order of the re-assigned phase-shift numbers, and ensures that the output voltage and current ripple are maintained within an acceptable range. The healthy modules execute the distributed carrier phase-shift step values through the bottom-layer controller.

7. A carrier phase-shifted dynamic allocation method for a modular multilevel converter according to claim 6, characterized in that: The distribution method of the carrier phase-shift step values is: taking the carrier of the first healthy module as the reference carrier, its phase-shift step value is 0, and the starting value of the carrier of the subsequent healthy modules = the maximum carrier count value in the bottom-layer controller - the number of the serial number × the phase-shift step value.

8. A carrier phase-shift dynamic allocation system of a modular multilevel converter for implementing the method according to any one of claims 1 to 7, characterized in that: Including a state detection and judgment module, a phase-shift step value calculation module, and a carrier phase-shift step value distribution module; The state detection and judgment module is used for detecting the module state of each sub-module in the modular multilevel converter system and judging the modules in a healthy state and the bypassed modules; The phase-shifting step value calculation module is configured to, according to the judgment results of the modules in the healthy state and the bypassed modules, count the number of modules that are currently in the healthy state and not bypassed as the number of healthy modules, and calculate the phase-shifting step value of the healthy modules; The carrier phase-shifting step value allocation module is configured to, according to the judgment results of the modules in the healthy state and the bypassed modules, remove the faulty modules or insert the redundant modules and re-assign the phase-shifting numbers to all the healthy modules to be inserted in the next moment. According to the phase-shifting step value of the healthy modules and in accordance with the re-assigned numbers of the healthy modules, allocate the carrier phase-shifting step values to each healthy module, and ensure that the output voltage and current ripple are maintained within an acceptable range.

9. An electronic device, characterized in that, Comprising: A memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor realizes a carrier phase-shifting dynamic allocation method for a modular multilevel converter as described in any one of claims 1-7 by executing the computer instructions.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, it realizes a carrier phase-shifting dynamic allocation method for a modular multilevel converter as described in any one of claims 1-7.

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