WO2022061927A1 - Submodule of modular multilevel converter, and control system, method and apparatus for modular multilevel converter - Google Patents

Abstract

A submodule of a modular multilevel converter (MMC), and a control system, method and apparatus for the modular multilevel converter. The submodule (70) of the modular multilevel converter comprises: a sensor module (50), which is adapted to detect parameters of the submodule (70); a wireless communication module (61), which is adapted to establish a first wireless communication connection with a control system; and a processor (71), which is adapted to send a first notification message, which contains the parameters, to the control system on the basis of the first wireless communication connection, and/or receive a first control instruction from the control system on the basis of the first wireless communication connection. The sub-module (70) with the wireless communication capability is realized, and the cost can be reduced. Moreover, distributed control is also realized, such that the security problem of centralized control can be solved.

Description

Submodule, control system, method and apparatus for modular multilevel converter technical field

The present application relates to the field of modular multilevel converters (Modular Multilevel Converter, MMC), and in particular, to a sub-module, control system, method and device of an MMC.

Background technique

MMC is a new type of voltage conversion circuit. It can superimpose and output high voltage by cascading multiple submodules. It also has the characteristics of less output harmonics and high modularity. Therefore, it is widely used in power systems. has broad application prospects. Common sub-module topologies include half-bridge sub-modules and full-bridge sub-modules, and so on. Among them, the half-bridge sub-module is the most common application in the current project, but it does not have the ability to ride through the DC fault, and needs to rely on the AC circuit breaker to remove the fault current. The full-bridge sub-module has DC fault ride-through capability, but due to large investment and operating losses, there is no large-scale engineering application at present.

In the prior art, a unified central control unit centrally controls the sending of control commands to sub-modules via optical fibers. However, there are cost issues with fiber-optic communications, and fiber is prone to become a bottleneck for failures.

In addition, the centralized control method has security problems. For example, when the central control unit fails, all sub-modules cannot work. Moreover, concentrating the control functions of all sub-modules to a unified central control unit may also reduce the real-time performance of the MMC.

SUMMARY OF THE INVENTION

In view of this, the main purpose of the embodiments of the present invention is to provide an MMC sub-module, control system, method and apparatus.

The technical solution of the embodiment of the present invention is realized as follows:

A sub-module of MMC, including:

a sensor module adapted to detect parameters of the submodule;

a wireless communication module adapted to establish a first wireless communication connection with the control system;

a processor adapted to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or to receive a first notification message from the control system based on the first wireless communication connection Control instruction.

It can be seen that the embodiment of the present invention realizes a sub-module with wireless communication capability, which does not need to use optical fibers to communicate with the outside world, can reduce hardware costs, and overcome the fault bottleneck defect of optical fibers.

In one embodiment, it also includes:

a commutation module, which is adapted for commutation;

a processor further adapted to receive, based on the first wireless communication connection, a second notification message from the control system including a target electrical property value for the MMC;

a wireless communication module, which is also adapted to establish a second wireless communication connection with other submodules in the MMC;

The processor is further adapted to receive, based on the second wireless communication connection, a third notification message from the other sub-modules including parameters of the other sub-modules, based on the target electrical property value and the relationship between the other sub-modules The parameter determines a second control command for controlling the converter module.

It can be seen that the sub-module in the embodiment of the present invention can also generate a second control instruction for controlling the converter module in itself based on the target electrical property value and the parameters of other sub-modules. Therefore, the sub-module has a control function, which overcomes the defect that the control function is concentrated in the central control unit and is prone to failure, and also improves the real-time performance of the MMC.

In one embodiment, the converter module includes a half-bridge type sub-module circuit structure or a full-bridge type sub-module circuit structure.

Therefore, the converter module has various circuit structures.

In one embodiment, the wireless communication module includes at least one of the following:

WI-FI module; Zigbee module; Bluetooth module; second generation mobile communication module; third generation mobile communication module; fourth generation mobile communication module; fifth generation mobile communication module; and/or

The sensor module includes at least one of the following: a current sensor; a voltage sensor; a temperature sensor.

It can be seen that the wireless communication module and the sensor module have various implementations and have a wide range of applications.

An MMC, comprising the submodule as described in any of the above.

Therefore, an MMC is proposed that includes sub-modules with wireless communication capabilities.

A control system of an MMC, the MMC includes N sub-modules, N is a positive integer at least 2, and each sub-module includes a respective wireless communication module; the control system includes:

a user terminal adapted to receive from each submodule a notification message containing the parameters of the respective submodule based on the wireless communication connection with the wireless communication module of each submodule;

A terminal is configured, which is adapted to send control instructions to each sub-module respectively based on the wireless communication connection with the wireless communication module of each sub-module.

Therefore, the embodiment of the present invention realizes a control system based on wireless communication, which not only saves the hardware cost, but also overcomes the fault bottleneck defect of the optical fiber.

In one embodiment, the wireless communication module is a Zigbee module;

The N Zigbee modules of the N sub-modules are networked in a star topology, a tree topology or a mesh topology.

Therefore, Zigbee modules can be networked in various ways.

A control method of MMC, the modular multilevel converter includes N sub-modules, each sub-module includes a respective wireless communication module, wherein N is a positive integer greater than or equal to 2, the method includes:

enabling each of the N submodules to detect the parameters of the respective submodules;

enabling each of the N submodules to establish a first wireless communication connection with the control system;

enabling each of the N submodules to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or from all submodules based on the first wireless communication connection The control system receives the first control command.

Therefore, the embodiment of the present invention realizes an MMC control method based on wireless communication, which not only saves the hardware cost, but also overcomes the fault bottleneck defect of the optical fiber.

In one embodiment, the method further includes:

enabling each of the N submodules to receive, from the control system, a second notification message containing a target electrical property value of the modular multilevel converter based on the first wireless communication connection;

enabling each of the N sub-modules to establish a second wireless communication connection with other sub-modules in the modular multilevel converter;

enabling each of the N submodules to receive, based on the second wireless communication connection, a third notification message containing parameters of the other submodules from the other submodules;

Each of the N sub-modules is enabled to determine a second control instruction for controlling the converter module in the respective sub-module based on the target electrical property value and the parameters of the other sub-modules.

It can be seen that the sub-module in the embodiment of the present invention can also generate a second control instruction for controlling the converter module in itself based on the target electrical property value and the parameters of other sub-modules. Therefore, the sub-module has a control function, which overcomes the defect that the control function is concentrated in the central control unit and is prone to failure, and also improves the real-time performance of the MMC.

An MMC control device, the MMC includes N sub-modules, each sub-module includes a respective wireless communication module, wherein N is a positive integer greater than or equal to 2, the device includes:

a first enabling module adapted to enable each of the N submodules to detect the parameters of the respective submodule;

a second enabling module adapted to enable each of the N sub-modules to establish a first wireless communication connection with the control system;

a third enabling module adapted to enable each of the N sub-modules to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or A first control instruction is received from the control system based on the first wireless communication connection.

Therefore, the embodiment of the present invention realizes an MMC control device based on wireless communication, which not only saves the hardware cost, but also overcomes the fault bottleneck defect of the optical fiber.

In one embodiment, it also includes:

A fourth enabling module adapted to enable each of the N sub-modules to receive, based on the first wireless communication connection, a second data containing the target electrical property value of the MMC from the control system notification message;

a fifth enabling module, adapted to enable each of the N sub-modules to establish a second wireless communication connection with other sub-modules in the MMC;

a sixth enabling module adapted to enable each of the N sub-modules to receive a third notification message containing parameters of the other sub-modules from the other sub-modules based on the second wireless communication connection ;

A seventh enabling module adapted to enable each of the N sub-modules to determine, based on the target electrical property value and parameters of the other sub-modules, for controlling the The second control command of the converter module.

It can be seen that the sub-module in the embodiment of the present invention can also generate a second control instruction for controlling the converter module in itself based on the target electrical property value and the parameters of other sub-modules. Therefore, the sub-module has a control function, which overcomes the defect that the control function is concentrated in the central control unit and is prone to failure, and also improves the real-time performance of the MMC.

A control device of an MMC, comprising a processor and a memory;

An application program executable by the processor is stored in the memory for causing the processor to execute the MMC control method as described above.

It can be seen that the proposed MMC control device with processor-memory architecture does not need to use optical fibers to communicate with the outside world, which can reduce hardware costs and overcome the fault bottleneck defect of optical fibers.

A computer-readable storage medium storing computer-readable instructions for executing the above-mentioned control method of the MMC.

It can be seen that the computer-readable storage medium containing computer-readable instructions is proposed, which does not need to use optical fibers to communicate with the outside world, can reduce hardware costs, and overcome the failure bottleneck defect of optical fibers.

Description of drawings

FIG. 1 is an exemplary block diagram of sub-modules of an MMC according to an embodiment of the present invention.

FIG. 2 is a first exemplary structural diagram of a control system of an MMC according to an embodiment of the present invention.

FIG. 3 is a second exemplary structural diagram of a control system of an MMC according to an embodiment of the present invention.

FIG. 4 is a flowchart of a control method of an MMC according to an embodiment of the present invention.

FIG. 5 is a structural diagram of a control device of an MMC according to an embodiment of the present invention.

FIG. 6 is a structural diagram of a control device of an MMC having a processor-memory architecture according to an embodiment of the present invention.

FIG. 7 is an exemplary structural diagram of an MMC according to an embodiment of the present invention.

Among them, the reference numerals are as follows:

label	meaning
70	submodule
40	Converter module
50	sensor module
60	Communication module
71	processor
51	current sensor
52	Voltage sensor

53	Temperature Sensor
61	wireless communication module
62	processor interface
41	Drive protection circuit
42	Converter module
100	Control System of Modular Multilevel Converter
80	MMC
10	Zigbee Gateway
11	Communications network
12	User terminal
13	Configure Terminal
70a	Zigbee module as coordinator
200	MMC control system
90	MMC
400	Control method of MMC
401～407	step
500	Controls for MMC
501	first enable module
502	Second enable module
503	The third enabling module
504	Fourth enable module
505	Fifth enabling module
506	The sixth enabling module
507	Seventh enable module
600	Controls for MMC
601	processor
602	memory
20	MMC
31	A-phase circuit
32	B-phase circuit
33	C-phase circuit
311	first half bridge circuit
312	second half bridge circuit
313, 314	Current sharing inductor

detailed description

In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present invention, and are not used to limit the protection scope of the present invention.

For the sake of brevity and intuition in description, the solution of the present invention is explained below by describing several representative embodiments. Numerous details in the embodiments are provided only to aid in understanding the aspects of the invention. However, it is obvious that the technical solutions of the present invention may not be limited to these details during implementation. In order to avoid unnecessarily obscuring aspects of the present invention, some embodiments are not described in detail, but merely framed. Hereinafter, "including" means "including but not limited to", and "according to..." means "at least in accordance with, but not limited to, only in accordance with...". Due to Chinese language habits, when the number of a component is not specified below, it means that the component may be one or more, or it may be understood as at least one.

The embodiments of the present invention provide a sub-module with wireless communication capability, which does not need to use optical fibers to communicate with the outside world, can reduce hardware costs, and overcome the fault bottleneck defect of optical fibers.

FIG. 1 is an exemplary block diagram of sub-modules of an MMC according to an embodiment of the present invention.

As shown in FIG. 1, the sub-module 70 includes:

a sensor module 50 adapted to detect parameters of the sub-module 70;

A wireless communication module 61, which is adapted to establish a first wireless communication connection with the control system;

A processor 71 adapted to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or to receive a first notification message from the control system based on the first wireless communication connection a control command.

In one embodiment, the wireless communication module 61 includes at least one of the following: a WI-FI module; a Zigbee module; a Bluetooth module; a second-generation mobile communication module; a third-generation mobile communication module; a fourth-generation mobile communication module; Five generations of mobile communication modules; and so on.

In one embodiment, the sensor module 50 includes at least one of the following: a current sensor; a voltage sensor; a temperature sensor, and the like. When the sensor module 50 includes the current sensor 51, the current sensor 51 detects the current of the sub-module 70; when the sensor module 50 includes the voltage sensor 52, the voltage sensor 52 detects the voltage of the sub-module 70; when the sensor module 50 includes the temperature sensor 53, The temperature sensor 53 detects the temperature of the submodule 70 .

Submodule 70 also includes processor interface 62 . Wireless communication module 61 is coupled to processor 71 via processor interface 62 . After receiving the first control command from the control system based on the first wireless communication connection, the wireless communication module 61 sends the first control command to the processor 71 via the processor interface 62, so that the processor 71 executes the first control command. The processor 71 generates a first notification message including parameters based on the detection value of the sensor module 50, and sends the first notification message to the wireless communication module 61 via the processor interface 62, so that the wireless communication module 61 sends the information to the wireless communication module 61 based on the first wireless communication connection. The control system sends the first notification message. The processor interface 62 and the wireless communication module 61 may be integrated into the communication module 60 .

The above exemplarily describes typical examples of the sensor module 50 and the wireless communication module 61, and those skilled in the art can realize that this description is only exemplary, and is not intended to limit the protection scope of the embodiments of the present invention.

In one embodiment, the sub-module 70 further comprises: a commutation module 40 adapted to commutate; a processor 71 further adapted to receive from the control system based on the first wireless communication connection The second notification message of the target electrical property value of the MMC; the wireless communication module 61, which is further adapted to establish a second wireless communication connection with other sub-modules in the MMC; the processor 71, which is further adapted to establish a second wireless communication connection based on the a second wireless communication connection, receiving a third notification message including parameters of the other submodules from the other submodules, and determining, based on the target electrical property value and the parameters of the other submodules, a third notification message for controlling the converter module 40 the second control command.

For example: when the target electrical property value in the second notification message is a positive voltage of 50KV, that is, the control system sends a second notification message expecting the MMC to output a positive voltage of 50KV, and the processor 71 sums the values provided by other sub-modules. For the output voltage, when it is determined that the current MMC does not reach a positive voltage of 50KV (for example, only 40KV), an instruction for controlling the switching module 40 to be switched on or switched off is generated. For example, if the current sub-module is located in the upper arm, the converter module 40 is switched on to increase the output positive voltage; if the current sub-module is located in the lower arm, the converter module 40 is switched out to reduce the output negative voltage.

It can be seen that the sub-module in the embodiment of the present invention can also generate a second control instruction for controlling the converter module in itself based on the target electrical property value and the parameters of other sub-modules. Therefore, the sub-module has a control function, which overcomes the defect that the control function is concentrated in the central control unit and is prone to failure, and also improves the real-time performance of the MMC.

Preferably, the sub-module 70 can be implemented as a half-bridge type sub-module or a full-bridge type sub-module, and so on.

Based on the above description, an embodiment of the present invention further proposes an MMC. The MMC includes submodules 70 as described above.

A typical structure of the MMC of the embodiment of the present invention is described below. FIG. 7 is an exemplary structural diagram of an MMC according to an embodiment of the present invention.

As shown in Figure 7, MMC20 includes:

The A-phase circuit 31 is connected to the DC power supply U _dc ;

The B-phase circuit 32 is connected to the DC power supply U _dc ;

The C-phase circuit 33 is connected to the DC power supply U _dc ;

The A-phase circuit 31 , the B-phase circuit 32 and the C-phase circuit 33 have the same first circuit topology; the first circuit topology includes: a first half-bridge circuit 311 ; a second half-bridge circuit 312 ; two current-sharing inductors 313, 314, connected in series between the first half-bridge circuit 311 and the second half-bridge circuit 312; wherein the first half-bridge circuit 311 and the second half-bridge circuit 312 have the same second circuit topology; the second circuit topology Contains a number of sub-modules 70 as described above.

In FIG. 7 , the number of sub-modules 70 in the first half-bridge circuit 311 can be conveniently increased to increase the output voltage of the MMC 20 , and the number of sub-modules 70 in the second half-bridge circuit 312 can be conveniently decreased to reduce the MMC 20 the output voltage.

The above exemplarily describes the typical structure of the MMC 20 including the sub-module 70, and those skilled in the art can realize that this description is only exemplary, and is not intended to limit the protection scope of the embodiments of the present invention.

Based on the above description, the embodiment of the present invention also proposes a control system of the MMC. The MMC may include N sub-modules 70 as shown in FIG. 1 , where N is a positive integer of at least 2, and each sub-module 70 includes a respective wireless communication module 61 . Specifically, the control system includes: a user terminal adapted to receive a notification message from each submodule 70 containing the parameters of the respective submodule based on the wireless communication connection with the wireless communication module 61 of each submodule 70; the configuration terminal , which is adapted to send control instructions to each sub-module 70 respectively based on the wireless communication connection with the wireless communication module 61 of each sub-module.

Preferably, the wireless communication module 61 is implemented as a Zigbee module. As a wireless network technology with short distance, low power consumption and low data transmission rate, Zigbee is a technical solution between wireless tag technology and Bluetooth. It is widely used in sensor networks and other fields, thanks to its powerful It can form Zigbee networks such as star, tree and mesh. Correspondingly, the N Zigbee modules of the N sub-modules in the MMC can be networked in a star topology, a tree topology or a mesh topology.

FIG. 2 is a first exemplary structural diagram of a control system of an MMC according to an embodiment of the present invention.

In FIG. 2, N Zigbee modules of N sub-modules 70 in the MMC 80 are networked in a star topology. Among them, the sub-module 70 a including the Zigbee module as a coordinator is connected to the Zigbee gateway 10 . The user terminal 12 and the configuration terminal 13 are connected to the Zigbee gateway 10 via the communication network 11, respectively.

Each of the N sub-modules 70 serving as a Zigbee node realizes information forwarding with the outside of the MMC 80 via the sub-module 70a. For example, a notification message including the parameters of each sub-module 70 can be sent to the user terminal 12 , and a control instruction about each sub-module 70 can also be received from the configuration terminal 13 . Preferably, it further includes an integrated sub-module control function on the sub-module 70a of the Zigbee module as the coordinator. The sub-module 70a determines whether the sub-module is switched in or the sub-module is switched out according to the state of the MMC 80 .

For example: when the sub-module 70a receives a notification message containing the target electrical property value (positive voltage of 50KV) from the user terminal 12, the control system sends a notification message to the sub-module 70a that the MMC 80 is expected to output a positive voltage of 50KV. The sub-module 70a receives electrical property values (eg, output voltage) of each sub-module 70 in the MMC 80 except for the sub-module 70a. The processor 71 in the sub-module 70a sums the output voltages provided by the various sub-modules 70, determines that the MMC 80 is not equal to the positive voltage of 50KV (for example, only 30KV or 60KV), and then generates an output voltage for controlling the MMC 80 except for the sub-module 70a. Each sub-module 70 of the sub-module 70 puts in or cuts out the instruction, so as to ensure that the MMC 80 achieves the target electrical property value. For example, when the current output voltage of MMC80 is less than the target electrical property value, increase the input number of sub-modules of the upper arm to increase the positive output voltage of MMC80; when the current output voltage of MMC80 is greater than the target electrical property value, increase the number of sub-modules of the lower arm The number of input modules to reduce the output positive voltage of MMC80.

FIG. 3 is a second exemplary structural diagram of a control system of a modular multilevel converter according to an embodiment of the present invention.

In FIG. 3, the N Zigbee modules of the N sub-modules 70 in the MMC 90 are in a mesh topology. Among them, the sub-module 70 a including the Zigbee module as the coordinator is connected to the Zigbee gateway 10 . The user terminal 12 and the configuration terminal 13 are connected to the Zigbee gateway 10 via the communication network 11, respectively.

The submodules closer to the submodule 70a realize information forwarding outside the MMC 90 via the submodule 70a, for example, a notification message containing the parameters of the respective submodules can be sent to the user terminal 12, and a control instruction can also be received from the configuration terminal 13. The submodules that are far away from the submodules 70a are connected to the submodules 70a via the routing function of the submodules that are nearby as routers, so as to realize the sending of the notification message containing the parameters of the respective submodules to the user terminal 12, or from the configuration terminal 13. Receive control commands. Preferably, the integrated sub-module control function on the sub-module 70a of the Zigbee module as the coordinator is further included. The sub-module 70a determines whether the sub-module is switched in or the sub-module is switched out according to the state of the MMC 90 .

For example, when the sub-module 70a receives a notification message containing the target electrical property value (positive voltage of 80KV) from the user terminal 12, the control system sends a notification message to the sub-module 70a that the MMC 90 is expected to output a positive voltage of 80KV. The sub-module 70a receives electrical property values (eg, output voltage) of each sub-module 70 in the MMC 90 except the sub-module 70a. The processor 71 in the sub-module 70a sums the output voltages provided by the various sub-modules 70, determines that the MMC 90 is not equal to a positive voltage of 80KV (for example, only 50KV or 100KV), and then generates a voltage for controlling the MMC 90 except for the sub-module 70a. Each sub-module 70 of the sub-module 70 puts in or cuts out the instruction, so as to ensure that the MMC 90 achieves the target electrical property value. For example, when the current output voltage of MMC90 is less than the target electrical property value, the input number of sub-modules of the upper arm is increased to increase the output positive voltage of MMC90; when the current output voltage of MMC90 is greater than the target electrical property value, the lower arm is increased The input number of sub-modules can reduce the output positive voltage of MMC90.

Based on the above description, an embodiment of the present invention also proposes a control method for the MMC.

FIG. 4 is a flowchart of a control method of an MMC according to an embodiment of the present invention. For example, the MMC may include N sub-modules 70 as shown in FIG. 1 , each sub-module 70 includes a respective wireless communication module 61 , where N is a positive integer greater than or equal to 2.

As shown in Figure 4, the method 400 includes:

Step 401: Enable each of the N sub-modules to detect the parameters of the respective sub-modules.

Step 402: Enable each of the N sub-modules to establish a first wireless communication connection with the control system.

Step 403: Enable each of the N sub-modules to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or based on the first wireless communication A connection receives a first control command from the control system.

In one embodiment, the method 400 further includes:

Step 404: Enable each of the N sub-modules to receive a second notification message from the control system including the target electrical property value of the MMC based on the first wireless communication connection.

Step 405: Enable each of the N sub-modules to establish a second wireless communication connection with other sub-modules in the MMC.

Step 406: Enable each of the N sub-modules to receive a third notification message including parameters of other sub-modules from the other sub-modules 70 based on the second wireless communication connection.

Step 407: Enable each of the N sub-modules to determine a second control for controlling the converter modules in the respective sub-modules based on the target electrical property value and the parameters of the other sub-modules instruction.

Based on the above description, an embodiment of the present invention also proposes an MMC control apparatus.

FIG. 5 is a block diagram of a control device for MMC according to an embodiment of the present invention. For example, the MMC may include N sub-modules 70 as shown in FIG. 1 , each sub-module 70 includes a respective wireless communication module 61 , where N is a positive integer greater than or equal to 2.

As shown in FIG. 5 , the apparatus 500 includes: a first enabling module 501 adapted to enable each of the N sub-modules to detect parameters of the respective sub-modules; a second enabling module 502 , which is adapted to enable each of the N sub-modules to establish a first wireless communication connection with the control system; a third enabling module 503 is adapted to enable each of the N sub-modules The module sends a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or receives a first control instruction from the control system based on the first wireless communication connection.

In one embodiment, the apparatus 500 further comprises: a fourth enabling module 504 adapted to enable each of the N sub-modules to connect from the control system based on the first wireless communication connection receiving a second notification message containing the target electrical property value of the modular multilevel converter; a fifth enabling module 505 adapted to enable each of the N submodules to communicate with the other submodules in the modular multilevel converter establish a second wireless communication connection; a sixth enabling module 506 adapted to enable each of the N submodules based on the second wireless a communication connection, receiving a third notification message containing parameters of the other submodules from the other submodules; a seventh enabling module 507 adapted to enable each of the N submodules based on the target The electrical property value and the parameters of the other sub-modules determine a second control command for controlling the converter modules in the respective sub-modules.

Based on the above description, an embodiment of the present invention further provides an MMC control apparatus.

FIG. 6 is a block diagram of a control device of an MMC according to an embodiment of the present invention.

As shown in FIG. 6 , the control apparatus includes a processor 601 and a memory 602; the memory 602 stores an application program executable by the processor 601, so as to make the processor 601 execute any one of the MMC control methods above.

An embodiment of the present invention further provides a computer-readable storage medium, in which computer-readable instructions are stored, and the computer-readable instructions are used to execute the control method for a modular multilevel converter as described in any one of the above.

It should be noted that not all steps and modules in the above-mentioned processes and structural diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution order of each step is not fixed and can be adjusted as required. The division of each module is only to facilitate the description of the functional division used. In actual implementation, a module can be implemented by multiple modules, and the functions of multiple modules can also be implemented by the same module. These modules can be located in the same device. , or in a different device.

The hardware modules in various embodiments may be implemented mechanically or electronically. For example, a hardware module may include specially designed permanent circuits or logic devices (eg, special purpose processors, such as FPGAs or ASICs) for performing specific operations. Hardware modules may also include programmable logic devices or circuits (eg, including general-purpose processors or other programmable processors) temporarily configured by software for performing particular operations. As for the specific use of a mechanical method, or a dedicated permanent circuit, or a temporarily configured circuit (for example, configured by software) to realize the hardware module, it can be decided according to cost and time considerations.

The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, it is possible to provide a system or device equipped with a storage medium on which software program codes for realizing the functions of any one of the above-described embodiments are stored, and make the computer (or CPU or MPU of the system or device) ) to read and execute the program code stored in the storage medium. In addition, a part or all of the actual operation can also be completed by an operating system or the like operating on the computer based on the instructions of the program code. The program code read from the storage medium can also be written into the memory provided in the expansion board inserted into the computer or into the memory provided in the expansion unit connected to the computer, and then the instructions based on the program code make the device installed in the computer. The CPU on the expansion board or the expansion unit or the like performs part and all of the actual operations, so as to realize the functions of any one of the above-mentioned embodiments. Embodiments of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (eg, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), Magnetic tapes, non-volatile memory cards and ROMs. Alternatively, the program code may be downloaded from a server computer over a communications network.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. A submodule (70) of a modular multilevel converter, characterized in that it comprises:

   a sensor module (50) adapted to detect parameters of said sub-module (70);

   a wireless communication module (61) adapted to establish a first wireless communication connection with the control system;

   a processor (71) adapted to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or from the control system based on the first wireless communication connection A first control command is received.
2. The submodule (70) of a modular multilevel converter according to claim 1, characterized in that, further comprising:

   a commutation module (40) adapted for commutation;

   wherein the processor (71) is further adapted to receive a second notification message from the control system based on the first wireless communication connection comprising a target electrical property value of the modular multilevel converter;

   the wireless communication module (61), which is further adapted to establish a second wireless communication connection with other sub-modules in the modular multilevel converter;

   The processor (71) is further adapted to receive, based on the second wireless communication connection, a third notification message containing parameters of the other submodules from the other submodules, based on the target electrical property value and the The parameters of the other sub-modules determine the second control command for controlling the converter module (40).
3. The sub-module (70) of a modular multi-level converter according to claim 1, wherein the converter module (40) comprises a half-bridge type sub-module circuit structure or a full-bridge type sub-module circuit structure .
4. The submodule (70) of a modular multilevel converter according to claim 1, characterized in that,

   The wireless communication module (61) includes at least one of the following: WI-FI module; Zigbee module; Bluetooth module; second-generation mobile communication module; third-generation mobile communication module; fourth-generation mobile communication module; fifth-generation mobile communication module mobile communication module; and/or

   The sensor module (50) includes at least one of the following: a current sensor (51); a voltage sensor (52); a temperature sensor (53).
5. A modular multilevel converter, characterized by comprising the submodule (70) according to any one of claims 1-4.
6. A control system (100, 200) for a modularized multilevel converter, characterized in that the modularized multilevel converter includes N submodules (70), where N is a positive integer at least 2, Each sub-module (70) includes a respective wireless communication module (61); the control system (100, 200) includes:

   A user terminal (12) adapted to receive from each sub-module (70) respectively a data containing the parameters of the respective sub-module (70) based on the wireless communication connection with the wireless communication module (61) of each sub-module (70) notification message;

   A terminal (13) is configured, which is adapted to send control instructions to each submodule (70) individually based on the wireless communication connection with the wireless communication module (61) of each submodule (70).
7. The control system (100, 200) for a modular multilevel converter according to claim 6, wherein the wireless communication module (61) is a Zigbee module;

   The N Zigbee modules of the N sub-modules (70) are networked in a star topology, a tree topology or a mesh topology.
8. A control method (400) for a modularized multilevel converter, characterized in that the modularized multilevel converter includes N sub-modules, and each sub-module includes a respective wireless communication module, wherein N is greater than or a positive integer equal to 2, the method (400) includes:

   enabling each of the N sub-modules to detect the parameters of the respective sub-modules (401);

   enabling each of the N sub-modules to establish a first wireless communication connection with the control system (402);

   enabling each of the N submodules to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or from all submodules based on the first wireless communication connection The control system receives the first control instruction (403).
9. The control method (400) of a modular multilevel converter according to claim 8, wherein the method (400) further comprises:

   enabling each of the N sub-modules to receive a second notification message from the control system containing the target electrical property value of the modular multilevel converter based on the first wireless communication connection ( 404);

   enabling each of the N sub-modules to establish a second wireless communication connection with other sub-modules in the modular multilevel converter (405);

   enabling each of the N sub-modules to receive, from the other sub-modules, a third notification message containing parameters of the other sub-modules based on the second wireless communication connection (406);

   Enabling each of the N sub-modules to determine a second control instruction for controlling the commutation modules in the respective sub-modules based on the target electrical property value and the parameters of the other sub-modules (407 ).
10. A control device (500) for a modularized multilevel converter, characterized in that the modularized multilevel converter includes N sub-modules, and each sub-module includes a respective wireless communication module, wherein N is greater than or a positive integer equal to 2, the apparatus (500) includes:

    a first enabling module (501) adapted to enable each of the N sub-modules to detect parameters of the respective sub-module;

    a second enabling module (502) adapted to enable each of the N sub-modules to establish a first wireless communication connection with the control system;

    a third enabling module (503) adapted to enable each of the N sub-modules to send a first notification message containing the parameter to the control system based on the first wireless communication connection, and/or receiving a first control instruction from the control system based on the first wireless communication connection.
11. The control device (500) for a modular multilevel converter according to claim 10, characterized in that, further comprising:

    A fourth enabling module (504) adapted to enable each of the N sub-modules to receive, based on the first wireless communication connection, from the control system a module comprising the modular multi-level switch a second notification message of the target electrical property value of the streamer;

    a fifth enabling module (505) adapted to enable each of the N sub-modules to establish a second wireless communication connection with other sub-modules in the modular multilevel converter;

    A sixth enabling module (506) adapted to enable each of the N sub-modules to receive, from the other sub-modules, a first sub-module including parameters of the other sub-modules based on the second wireless communication connection. three notification messages;

    A seventh enabling module (507) adapted to enable each of the N sub-modules to determine, based on the target electrical property value and the parameters of the other sub-modules, for controlling the respective sub-modules The second control command of the converter module in the module.
12. A control device (600) for a modularized multilevel converter, characterized in that it comprises a processor (601) and a memory (602);

    An application program executable by the processor (601) is stored in the memory (602) for causing the processor (601) to execute the modular multilevel commutation according to claim 8 or 9 The control method (400) of the device.
13. A computer-readable storage medium, wherein computer-readable instructions are stored therein, and the computer-readable instructions are used to execute the control method (400) of the modular multilevel converter as claimed in claim 8 or 9. ).

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