Hierarchical control method, system and equipment based on MMC type multi-port power electronic transformer and medium

Abstract

The invention discloses a hierarchical control method, system and device based on an MMC type multi-port power electronic transformer and a medium, the system comprises an upper computer, a mainboard DSP, a mainboard FPGA, an FPGA of a bridge arm control board, a sub-module of the bridge arm control board and a power main loop, the upper computer is connected with the mainboard DSP, the mainboard DSP is connected with the power main loop and the mainboard FPGA, the sub-module of the bridge arm control board is connected with the power main loop, and the mainboard FPGA is connected with the sub-module of the bridge arm control board. The mainboard FPGA is connected with the FPGA of the bridge arm control board, the FPGA of the bridge arm control board is connected with the sub-module of the bridge arm control board, and the method, the system, the equipment and the medium can improve the real-time performance and the stability of the system and reduce the complexity of the system at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of AC / DC hybrid power distribution networks, and relates to a hierarchical control method, system, equipment and medium based on an MMC type multi-port power electronic transformer. Background Art

[0002] Against the backdrop of global energy restructuring and the rapid development of renewable energy, the power system is transforming from the traditional single AC power supply mode to an AC / DC hybrid distribution network. This transformation has triggered a higher demand for the flexibility, diversity and efficiency of the distribution network. However, due to its large size, heavy weight and slow response speed, traditional power frequency transformers have been unable to meet the needs of modern distribution networks for efficient, flexible and multifunctional power conversion equipment.

[0003] As a new type of transformer, power electronic transformer realizes energy conversion and voltage regulation through power electronic technology. It has the advantages of small size, light weight, fast response speed and high energy conversion efficiency, and will become a key device in the future AC / DC hybrid distribution network. In particular, power electronic transformers based on modular multilevel converters (MMC) have been widely studied and applied due to their modular structure, low harmonic distortion and good scalability. MMC power electronic transformers can realize AC / DC conversion, and connect power supplies and loads of different voltage levels and power levels through a multi-port structure, which has higher flexibility and reliability.

[0004] However, with the increasing complexity of the system, MMC multi-port power electronic transformers face a series of challenges in practical applications. First, the electrical characteristics and control requirements of each port under the multi-port structure are different, which makes the design of signal transmission and control strategy more complicated. When processing multi-port and multi-level signals, the traditional centralized control architecture is prone to control delays, unstable signal transmission and other problems, which in turn affects the real-time and stability of the system. In addition, while ensuring efficient energy conversion, how to reduce the complexity of the control system is also an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a hierarchical control method, system, device and medium based on MMC type multi-port power electronic transformer. The method, system, device and medium can improve the real-time performance and stability of the system while reducing the complexity of the system.

[0006] To achieve the above-mentioned purpose, the present invention discloses a hierarchical control system based on an MMC-type multi-port power electronic transformer, comprising a host computer, a mainboard DSP, a mainboard FPGA, an FPGA of a bridge arm control board, a submodule of the bridge arm control board and a main power circuit, wherein the host computer is connected to the mainboard DSP, the mainboard DSP is connected to the main power circuit and the mainboard FPGA, the mainboard FPGA is connected to the FPGA of the bridge arm control board, and the FPGA of the bridge arm control board is connected to the submodule of the bridge arm control board.

[0007] Furthermore, the host computer and the mainboard DSP communicate with each other in a serial communication manner.

[0008] Furthermore, the mainboard DSP and the mainboard FPGA are connected in a parallel communication manner.

[0009] Furthermore, the mainboard FPGA and the FPGA of the bridge arm control board communicate with each other using an optical fiber-based SPI communication method.

[0010] Furthermore, the FPGA of the bridge arm control board communicates with the submodules of the bridge arm control board using a serial peripheral interface communication method.

[0011] Furthermore, the host computer uses a human-machine interface display and control screen.

[0012] The present invention discloses a hierarchical control method based on an MMC type multi-port power electronic transformer, comprising the following steps:

[0013] The host computer transmits control instructions to the mainboard DSP, the mainboard DSP sends a relay drive signal to the power main circuit, and transmits a modulation signal to the mainboard FPGA, the mainboard FPGA transmits the modulation signal to the FPGA of each bridge arm control board respectively, and the FPGA of the bridge arm control board controls the switch devices on each sub-module of the bridge arm control board to turn on / off;

[0014] The sub-module of the bridge arm control board transmits the AD conversion data to the FPGA of the bridge arm control board. The FPGA of the bridge arm control board transmits the voltage and current status of the sub-module to the main board DSP via the main board FPGA. The main board DSP simultaneously receives the voltage and current status and fault signal sent from the main power circuit. The main board DSP transmits the received data to the host computer for display. The user issues control instructions based on the data displayed by the host computer.

[0015] Furthermore, the host computer and the mainboard DSP communicate with each other using serial communication;

[0016] The mainboard DSP and the mainboard FPGA are connected by parallel communication;

[0017] The main board FPGA and the bridge arm control board FPGA communicate with each other using the optical fiber-based SPI communication method;

[0018] The FPGA of the bridge arm control board communicates with the submodules of the bridge arm control board using a serial peripheral interface communication method.

[0019] The present invention discloses a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the hierarchical control method based on an MMC-type multi-port power electronic transformer are implemented.

[0020] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the hierarchical control method based on an MMC-type multi-port power electronic transformer are implemented.

[0021] The present invention has the following beneficial effects:

[0022] The hierarchical control system and method based on the MMC type multi-port power electronic transformer described in the present invention significantly improves the coordination and real-time performance of the system by dividing the control level and optimizing the communication mode during specific operation. Compared with the prior art, the present invention excels in improving the real-time performance and stability of the system, effectively reduces the delay in the signal transmission process, and enhances the rapid response capability of the system. At the same time, the independent control of each level simplifies the control structure of the system, so that the system can operate efficiently and stably under a complex multi-port configuration. The introduction of fiber-optic communication not only provides electrical isolation and avoids electromagnetic interference, but also ensures the stability of data transmission and the reliability of the system. The present invention is particularly suitable for the application of multi-port power electronic transformers in future smart distribution networks. While improving system performance, it provides a reliable solution for the efficient control of complex power electronic devices.

[0023] Furthermore, the present invention optimizes the signal transmission path, simplifies the system control structure, and significantly improves the overall coordination and operating efficiency of the system by dividing the control architecture into multiple levels and adopting different communication methods and protocols. It is suitable for the application of complex power electronic devices in AC / DC hybrid distribution networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 This is the overall spatial layout diagram of the MMC type multi-port power electronic transformer system;

[0026] Figure 2 This is the hierarchical control design scheme diagram of MMC type multi-port power electronic transformer;

[0027] Figure 3a This is the interface diagram of the switch command control of the host computer;

[0028] Figure 3b This is the status monitoring interface diagram of the host computer;

[0029] Figure 4 This is the parallel communication diagram between the mainboard DSP and FPGA;

[0030] Figure 5 It is a diagram of asynchronous serial communication based on optical fiber;

[0031] Figure 6 This is the communication diagram between the bridge arm control board and the submodule;

[0032] Figure 7 It is a flowchart of hierarchical control program;

[0033] Figure 8 This is a prototype diagram of an MMC type multi-port power electronic transformer;

[0034] Figure 9a It is the basic working waveform diagram of the port voltage and port current of the MMC type multi-port power electronic transformer;

[0035] Figure 9b This is the basic working waveform of the sub-module capacitor voltage of the MMC type multi-port power electronic transformer. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0037] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0038] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0039] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. 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 the present invention generally indicates that the associated objects are in an "or" relationship.

[0040] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0041] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0044] Embodiment 1

[0045] refer to Figure 1 The MMC type multi-port power electronic transformer includes devices and modules, which need to be effectively arranged in a limited space. The present invention adopts a modular design scheme suitable for this topology, based on a spatial layout scheme of vertical stacking and centralized distribution. Due to the huge amount of device data and complex signal transmission, in order to ensure the stability of data transmission and the reliability of the system, the hierarchical control system based on the MMC type multi-port power electronic transformer described in the present invention is as follows: Figure 2 As shown, the hierarchical control system based on the MMC type multi-port power electronic transformer includes a host computer, a mainboard DSP, a mainboard FPGA, an FPGA of a bridge arm control board, a submodule of the bridge arm control board and a power main circuit, wherein the host computer is connected to the mainboard DSP, the mainboard DSP is connected to the power main circuit and the mainboard FPGA, the mainboard FPGA is connected to the FPGA of the bridge arm control board, and the FPGA of the bridge arm control board and the submodule of the bridge arm control board are specifically connected as follows:

[0046] 1) Communication design between host computer and mainboard DSP

[0047] The host computer is the control system entrance of the device, which is used to send start and stop commands, and receive and monitor the operating status of the device. Specifically, the host computer monitors 24 signal data from 18 sub-modules, including capacitor voltage, medium-voltage DC side voltage and current, medium-voltage AC side voltage and current, and low-voltage DC side voltage and current. Since these data are mainly used for status monitoring, the real-time requirements are relatively low, and there is a spatial distance between the host computer and the mainboard, so the host computer and the mainboard DSP use serial communication (SCI) to communicate. The host computer uses a human-machine interface display and control screen. The display and control screen has two serial interfaces and supports RS232 / 485 / 422 communication methods. RS232 is selected as the serial data interface. RS232 has extremely strong stability and anti-interference ability in long-distance communication. At the same time, considering that the real-time requirements of the 24-channel signal data are not high, a transmission delay of 10ms is set. This design not only optimizes the system cost, but also ensures the stable transmission of the signal, laying a solid foundation for the stable operation of the entire control system. The switch command control interface of the host computer is as follows: Figure 3a , the status monitoring interface is as follows Figure 3b .

[0048] 2) Signal interaction and protection mechanism between mainboard DSP and power main circuit

[0049] The signal transmission between the mainboard DSP and the power main circuit is very critical, involving 13 signals from the main circuit and 4 relay signals, including the current signals of the upper and lower bridge arms of the three phases A, B, and C, the three phase AC voltage signals of A, B, and C, two DC side voltage signals, and two control disturbance signals. The above signals are directly transmitted to the AD port of the mainboard DSP through PCB wiring to ensure the reliability and anti-interference ability of signal transmission. In addition, the mainboard DSP is also responsible for sending on / off instructions to the current limiting resistor relay of the main circuit to trigger the soft start process, while controlling the three phase relay signals of A, B, and C, a total of 4 relay signals, and receiving fault signals from the main circuit to achieve real-time protection of the system. This direct signal transmission method not only reduces possible delays, but also greatly reduces the risk of interference during signal transmission. In addition, the mainboard DSP effectively triggers the soft start process by accurately controlling the switch state of the relay, and protects the stable operation of the system by real-time monitoring of fault signals.

[0050] 3) High-speed parallel communication design between mainboard DSP and mainboard FPGA

[0051] The mainboard DSP is responsible for generating the driving signals of 216 switching devices and transmitting them to the mainboard FPGA through parallel communication. That is, the mainboard DSP and the mainboard FPGA are connected by parallel communication. At the same time, the mainboard FPGA feeds back the voltage and current status signals of the submodules to the mainboard DSP. Since the transmission of the driving signal is time-sensitive, it is necessary to ensure that the delay is minimized. Therefore, the parallel communication method is selected. The parallel communication design can not only significantly improve the data transmission rate, but also reduce the delay, ensuring that the system can respond and adjust quickly, thereby improving the overall operation efficiency. Figure 4 shown.

[0052] 4) Innovative design of bridge arm control board and mainboard FPGA based on optical fiber SPI communication

[0053] Taking into account the control principle of carrier phase shift, the data signals of the sub-modules in the same bridge arm need to be transmitted synchronously. Therefore, a bridge arm control board equipped with FPGA and three sub-modules are selected for signal transmission to save device costs.

[0054] The communication between the main board FPGA and the FPGA of the six bridge arm control boards involves the transmission of the driving signals of the switch devices and the state feedback of the voltage and current of the submodules. The two communicate with each other using the SPI communication method based on optical fiber. Optical fiber communication not only provides high-speed data transmission, but also realizes electrical isolation, effectively avoiding the influence of electromagnetic interference on communication. This design choice is based on the need to maintain high stability and low latency in a complex electromagnetic environment, which greatly improves the reliability and anti-interference ability of the system. The asynchronous serial communication method based on optical fiber, such as Figure 5 shown.

[0055] 5) Precise control and feedback mechanism between the FPGA of the bridge arm control board and the sub-modules of the bridge arm control board

[0056] The FPGA of each bridge arm control board receives the driving signal sent by the main board FPGA, generates a PWM wave and passes it to the three sub-modules controlled by each, and then the sub-module transmits the generated PWM wave directly to the driver chip of the half-bridge module. At the same time, the sub-module needs to transmit 72 feedback signals such as DAB input voltage, DAB output voltage, DAB output current and disturbance injection signal to the FPGA of the bridge arm control board. The serial peripheral interface (SPI) communication method is used between the two to ensure fast and accurate data transmission under high bandwidth, reducing signal redundancy and system complexity caused by parallel communication. SPI communication provides excellent stability and low latency under such high-density signal transmission requirements, and is the key to ensuring rapid response of the system. Figure 6 shown.

[0057] In summary, if Figure 7 As shown, the hierarchical control method based on the MMC type multi-port power electronic transformer of the present invention includes the following steps: from top to bottom, the host computer conveys the control instruction to the main board DSP, the main board DSP sends the relay drive signal to the power main circuit, and transmits the modulation signal to the main board FPGA, the main board FPGA transmits the modulation signal to the FPGA of the 6 bridge arm control boards respectively, thereby the FPGA of the bridge arm control board controls the switch devices on each sub-module of the bridge arm control board to turn on / off.

[0058] From bottom to top, the submodule of the bridge arm control board transmits the AD conversion data to the FPGA of the bridge arm control board, and the FPGA of the bridge arm control board transmits the voltage and current status of the submodule to the main board DSP via the main board FPGA. The main board DSP also receives the voltage and current status of the power main circuit and the fault signal. The main board DSP transmits the received data to the host computer for display. The user issues control instructions based on the data displayed by the host computer, thus forming a closed loop. This hierarchical control design not only ensures the reliability of signal transmission, but also significantly improves the overall coordination performance of the system.

[0059] Confirmatory experiments

[0060] In order to verify the present invention, a scaled-down MMC multi-port power electronic transformer experimental prototype was built. Figure 8 The main parameters are shown in Table 1.

[0061] Table 1

[0062]

[0063] The basic steady-state waveform of a multi-port power electronic transformer under rated conditions is as follows: Figure 9a and Figure 9b As shown. The present invention realizes the stable operation of multi-port power electronic transformers under complex working conditions through reasonable hierarchical division and effective communication strategy. The experimental results show that both the MVAC side current and the LVDC side voltage remain stable, proving the effectiveness of MMC-level and DAB-level closed-loop control, and reflecting the good coordination between hierarchical control. Figure 9b The capacitor voltages in different phases, different bridge arms and different sub-modules are shown in the figure. The DC components of the capacitor voltages of all sub-modules are stable at 50V, which verifies the effectiveness of the bridge arm balance control and the sub-module capacitor voltage balance control, and also further verifies the effectiveness of the hierarchical control design scheme.

[0064] Through hierarchical control, the coordinated operation between modules is optimized, the reliability and real-time performance of signal transmission are significantly enhanced, and the overall performance of the system is greatly improved. The hierarchical control design not only ensures the stability and safety of the system, but also greatly simplifies the control structure, reduces the complexity of the system, and improves the response speed and operating efficiency of the system. This makes the present invention particularly suitable for the application of multi-port power electronic transformers in future smart distribution networks, and provides reliable guarantee and support for the efficient and stable operation of complex power electronic devices.

[0065] Embodiment 2

[0066] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the hierarchical control method based on the MMC type multi-port power electronic transformer are implemented. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus. The internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0067] Embodiment 3

[0068] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the hierarchical control method based on the MMC type multi-port power electronic transformer are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0069] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0070] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0073] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0074] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A hierarchical control system based on MMC type multi-port power electronic transformer, characterized in that: It includes a host computer, a mainboard DSP, a mainboard FPGA, an FPGA of a bridge arm control board, a sub-module of the bridge arm control board and a main power circuit, wherein the host computer is connected to the mainboard DSP, the mainboard DSP is connected to the main power circuit and the mainboard FPGA, the mainboard FPGA is connected to the FPGA of the bridge arm control board, and the FPGA of the bridge arm control board is connected to the sub-module of the bridge arm control board.

2. The hierarchical control system based on the MMC type multi-port power electronic transformer according to claim 1 is characterized in that: The host computer and the mainboard DSP communicate with each other via serial communication.

3. The hierarchical control system based on the MMC type multi-port power electronic transformer according to claim 1 is characterized in that: The mainboard DSP and the mainboard FPGA are connected in parallel communication.

4. The hierarchical control system based on MMC type multi-port power electronic transformer according to claim 1 is characterized in that: The main board FPGA and the bridge arm control board FPGA communicate with each other using the optical fiber-based SPI communication method.

5. The hierarchical control system based on MMC type multi-port power electronic transformer according to claim 1 is characterized in that: The FPGA of the bridge arm control board communicates with the submodules of the bridge arm control board using a serial peripheral interface communication method.

6. The hierarchical control system based on MMC type multi-port power electronic transformer according to claim 1 is characterized in that: The host computer uses a human-machine interface display and control screen.

7. A hierarchical control method based on MMC type multi-port power electronic transformer, characterized in that: The hierarchical control system based on the MMC type multi-port power electronic transformer according to claim 1 comprises the following steps: The host computer transmits control instructions to the mainboard DSP, the mainboard DSP sends a relay drive signal to the power main circuit, and transmits a modulation signal to the mainboard FPGA, the mainboard FPGA transmits the modulation signal to the FPGA of each bridge arm control board respectively, and the FPGA of the bridge arm control board controls the switch devices on each sub-module of the bridge arm control board to turn on / off; The sub-module of the bridge arm control board transmits the AD conversion data to the FPGA of the bridge arm control board. The FPGA of the bridge arm control board transmits the voltage and current status of the sub-module to the main board DSP via the main board FPGA. The main board DSP simultaneously receives the voltage and current status and fault signal sent from the main power circuit. The main board DSP transmits the received data to the host computer for display. The user issues control instructions based on the data displayed by the host computer.

8. The hierarchical control method based on MMC type multi-port power electronic transformer according to claim 7 is characterized in that: The host computer and the mainboard DSP communicate with each other using serial communication; The mainboard DSP and the mainboard FPGA are connected by parallel communication; The main board FPGA and the bridge arm control board FPGA communicate with each other using the optical fiber-based SPI communication method; The FPGA of the bridge arm control board communicates with the submodules of the bridge arm control board using a serial peripheral interface communication method.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the hierarchical control method based on the MMC multi-port power electronic transformer as described in any one of claims 7 to 8 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the hierarchical control method based on the MMC type multi-port power electronic transformer as described in any one of claims 7 to 8 are implemented.

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