Driver adjustable energy supply method and system for IGCT-MMC flexible DC submodule

Abstract

The invention belongs to the field of flexible direct current power transmission, and discloses a driver adjustable energy supply method and system for an IGCT-MMC flexible direct current submodule, and the method comprises the steps: calculating the turn-off current of an IGCT device through collecting the port current and a switching mode, and determining the needed energy supply power according to the function relation between the turn-off current and the needed energy supply power of a driver. By monitoring the states of the sub-modules in real time, the number of standardized modules of the energy supply module parallel system is dynamically adjusted so as to achieve distribution of energy supply power according to needs. The turn-off current of the IGCT device is in direct proportion to the required power, so that the number of modules is configured by accurately calculating the turn-off current, the power waste can be effectively avoided, and the energy supply efficiency is improved. By adopting the method, the flexible adjustment of the energy supply of the driver is realized, the reliability of the system is improved through the module redundancy design, the design requirements of compactness, light weight and low loss of the IGCT-MMC power sub-module are met, and efficient production and high-reliability operation are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible DC power transmission, and particularly relates to a method and system for adjustable energy supply of a driver for an IGCT-MMC flexible DC sub-module. Background Art

[0002] The accommodation and transmission of new energy have given rise to a huge demand for a new type of power system. As a new type of power transmission method, flexible DC power transmission technology has the advantages of flexible control, small occupied area of converter stations, and applicability to various power grid structures, providing strong technical support for the grid connection and transmission of new energy. However, in most of the currently put into operation or under construction flexible DC power transmission projects, IGBTs are mostly used as switching devices. Although IGBT devices perform well in some aspects, their production and manufacturing processes are complex and the technical barriers are high, resulting in a small proportion of domestic IGBT devices. In contrast, IGCT devices have the advantages of large current, high blocking voltage, high reliability, compact structure, and low conduction loss, and also have low cost and high yield, and can achieve nationalized design at the same time. Therefore, IGCT devices have broad application prospects in the field of flexible DC power transmission.

[0003] However, there are significant differences in the driving methods between IGCT devices and IGBT devices. IGCT devices are current-source controlled devices, and their turn-off needs to be executed by a driver and consumes a large amount of power. And the turn-off current is proportional to the required power, which poses high requirements for the energy supply of the driver. With the trend of sub-module design towards compactness, lightness, and low loss, how to provide a driver adjustable energy supply method with high reliability and low loss for IGCT-MMC flexible DC sub-modules has become an urgent problem to be solved. Most of the existing technologies focus on aspects such as fault handling and dynamic characteristic testing of IGCT-MMC power sub-modules, and do not involve the improvement of the driver energy supply method.

[0004] It can be seen that currently there is a lack of an adjustment scheme for the driver energy supply of IGCT-MMC power sub-modules, resulting in the inability to achieve power distribution on demand, efficient production, and high-reliability operation. Summary of the Invention

[0005] The present invention provides a method and system for adjustable energy supply of a driver for an IGCT-MMC flexible DC sub-module to solve the technical problem that due to the lack of test measures capable of simulating the operating conditions of bypass switches in a flexible DC power transmission system, the reliability of bypass switches in frequent on-off tests under load cannot be effectively verified.

[0006] To achieve the above object, the present invention adopts the following technical content: In a first aspect, the present invention provides an adjustable energy supply method for a driver of an IGCT-MMC flexible DC sub-module, including: collecting the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module; obtaining the IGCT device turn-off current based on the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module; calculating the required energy supply power of the driver based on the functional relationship between the IGCT device turn-off current and the required energy supply power of the driver and the IGCT device turn-off current; dynamically configuring the number of standardized modules of the parallel energy supply module system according to the required energy supply power of the driver; the parallel energy supply module system is composed of multiple standardized modules connected in parallel, and each standardized module is redundant with each other.

[0007] In a second aspect, the present invention provides an adjustable energy supply system for a driver of an IGCT-MMC flexible DC sub-module, including a sampled current processing module, a parallel energy supply module system, and a control system; the sampled current processing module is used to transmit the collected port current of the IGCT-MMC flexible DC sub-module to the control system for data conversion, and transmit the port current of the IGCT-MMC flexible DC sub-module after data conversion to the control system; The control system includes: a first calculation module, which is used to obtain the IGCT device turn-off current based on the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module; a second calculation module, which is used to calculate the required energy supply power of the driver based on the functional relationship between the IGCT device turn-off current and the required energy supply power of the driver and the switching mode of the IGCT-MMC flexible DC sub-module; a power configuration module, which is used to dynamically configure the number of standardized modules in the parallel energy supply module system according to the required energy supply power of the driver; the parallel energy supply module system is composed of multiple standardized modules connected in parallel, and each standardized module is redundant with each other; the parallel energy supply module system is used to supply energy to the driver of the IGCT device.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an adjustable energy supply method for the driver of an IGCT-MMC flexible DC sub-module. In this method, the turn-off current of the IGCT device is calculated by collecting the port current and the switching mode, and then the required energy supply power is determined according to the functional relationship between the turn-off current and the energy supply power required by the driver. By real-time monitoring the state of the sub-module, the number of standardized modules in the parallel system of the energy supply module is dynamically adjusted to achieve the on-demand distribution of the energy supply power. Since the turn-off current of the IGCT device is proportional to the required power, accurately calculating the turn-off current to configure the number of modules can effectively avoid power waste and improve the energy supply efficiency. Using this method not only realizes the flexible adjustment of the driver energy supply, but also improves the reliability of the system through the redundant design of the modules, meets the design requirements of compactness, light weight, and low loss of the IGCT-MMC power sub-module, and achieves efficient production and high-reliability operation.

[0009] The present invention also provides an adjustable energy supply system for the driver of an IGCT-MMC flexible DC sub-module, including a sampling current processing module, a parallel system of energy supply modules, and a control system. This system collects and transmits the port current to the control system through the sampling current processing module. The first calculation module in the control system calculates the turn-off current of the IGCT device in combination with the switching mode, and the second calculation module then calculates the required energy supply power according to the functional relationship between the turn-off current and the energy supply power required by the driver. The power configuration module dynamically configures the number of modules in the parallel system of the energy supply modules accordingly. The parallel system of energy supply modules consists of multiple mutually redundant standardized modules. This system accurately calculates the turn-off current and the required power, realizes the on-demand configuration of the energy supply modules, improves the flexibility and reliability of the energy supply, meets the high requirements of the IGCT-MMC flexible DC sub-module for the driver energy supply, and achieves the efficient distribution of power and the reliable operation of the system. Description of the Drawings

[0010] Figure 1 Schematic diagram of the topology structure of the IGCT-MMC flexible DC sub-module provided by the embodiment of the present invention; Figure 2 Curve graph of the turn-off current of a certain 6500V / 4000A IGCT device and the energy supply power required by the driver provided by the embodiment of the present invention; Figure 3 Schematic diagram of the switching mode of the IGCT-MMC flexible DC sub-module provided by the embodiment of the present invention; among them, (a) is the input mode and the port current is greater than 0; (b) is the cut-out mode and the port current is greater than 0; (c) is the input mode and the port current is less than 0; (d) is the cut-out mode and the port current is less than 0; Figure 4 Schematic diagram of the connection of the adjustable energy supply system provided by the embodiment of the present invention; Figure 5It is the principle block diagram of the adjustable power supply system for the driver provided by the embodiment of the present invention; Figure 6 It is the flow chart of a method for adjustable power supply of the driver for the IGCT-MMC flexible DC sub-module provided by the embodiment of the present invention; Figure 7 It is the structural schematic diagram of an adjustable power supply system for the driver for the IGCT-MMC flexible DC sub-module provided by the embodiment of the present invention. Specific embodiments

[0011] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0012] To make the objectives, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0013] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0014] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0015] In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0016] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] The technical terms involved in the present invention are now explained: The IGCT-MMC power sub-module is the basic component unit in a Modular Multilevel Converter (MMC for short), which combines the Integrated Gate Commutated Thyristor (IGCT for short) technology and is used to achieve efficient electric energy conversion and control.

[0018] The full name of IGBT is Insulated Gate Bipolar Transistor, and its Chinese name is insulated gate bipolar transistor. It is a composite fully controlled voltage-driven power semiconductor device that combines the characteristics of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and a Bipolar Junction Transistor (BJT).

[0019] Combined with what is mentioned in the background technology, currently there is a lack of an adjustment scheme for the power supply of the driver for the IGCT-MMC power sub-module, resulting in the inability to achieve power distribution on demand, efficient production, and high-reliability operation.

[0020] To solve the above problems, the present invention provides a method for adjustable power supply of the driver for the flexible DC sub-module of IGCT-MMC. This method matches the power supply of the driver in real time by detecting the working current of the IGCT power device in the sub-module. The power supply of the driver adopts a parallel controllable power supply, that is, a power supply module parallel system. The power supply module parallel system is composed of multiple standardized modules. During use, the corresponding number of standardized modules is put into operation according to the power demand situation. When the flexible DC sub-module of IGCT-MMC operates with a small current, only some standardized modules are started in the power supply module parallel system, improving the output efficiency. At the same time, when a single standardized module fails, it can be actively switched to the standby standardized module, further improving the operation reliability. Moreover, the use of standardized modules can further reduce the production and manufacturing costs and improve the configuration flexibility, which is beneficial to the batch consistency and configuration diversity of products.

[0021] The present invention will be further explained below in conjunction with the drawings and embodiments: Exemplarily, as Figure 1 shown, this embodiment provides a topological structure of a flexible DC sub-module of IGCT-MMC: The flexible DC sub-module of IGCT-MMC includes fully controlled switching devices S1, S2; diodes D1, D2, DC capacitor C, bypass switch K, anode reactance Li, clamping diode D CL , clamping resistor R CL , clamping capacitor C CL; where S1 and D1 are connected in parallel, S2 and D2 are connected in parallel, and the bypass switch K is connected in parallel across S2 and D2.

[0022] When the IGCT device in the IGCT-MMC flexible DC sub-module is turned off, its driver needs to provide energy. As Figure 2 shown, Figure 2 shows the relationship between the turn-off current of the IGCT device and the power required to be supplied by the driver ( Figure 2 simply referred to as the driver power in ); that is, the historical turn-off current historical data of the IGCT device and the historical data of the power required to be supplied by the driver. By plotting the obtained Figure 2 curve and then fitting the curve, the function between the turn-off current of the IGCT device and the power required to be supplied by the driver can be obtained: In the formula, represents the power required to be supplied by the driver; represents the turn-off current of the IGCT device.

[0023] As Figure 3 shown, specifically as shown in (a), (b), (c), and (d) in Figure 3 , there are mainly two switching modes of the IGCT-MMC flexible DC sub-module in the system, namely the input mode and the cut-out mode. Let S represent the switching mode of the IGCT-MMC flexible DC sub-module. When S = 1, it means that the IGCT-MMC flexible DC sub-module is operating in the input mode. When S = 0, it means that the IGCT-MMC flexible DC sub-module is operating in the cut-out mode. And under different switching modes, the direction of the port current determines the operating state of the internal devices of the IGCT-MMC flexible DC sub-module.

[0024] When the IGCT-MMC flexible DC sub-module is in the input mode, when the port current is [condition 1], all the current flows through D1. When the port current is [condition 2], all the current flows through S1. When the IGCT-MMC flexible DC sub-module is in the cut-out mode, when the port current is [condition 3], all the current flows through S2. When the port current is [condition 4], all the current flows through D2. Therefore, the power required to be supplied by the driver of the IGCT device can be pre-configured by combining the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module.

[0025] As Figure 4As shown in the figure, in the IGCT-MMC flexible DC sub-module, the adjustable power supply system of the driver obtains energy from the DC capacitor. After internal conversion, it outputs to the upper IGCT drive (the first driver) and the lower IGCT drive (the second driver).

[0026] On the one hand, a current acquisition device is configured at the port of the IGCT-MMC flexible DC sub-module. The current acquisition device can use a Hall sensor or a Rogowski coil. The current acquisition device inputs the collected information (the port current of the IGCT-MMC flexible DC sub-module) to the adjustable power supply system of the driver. On the other hand, the main control board of the IGCT-MMC flexible DC sub-module transmits the switching mode situation to the adjustable power supply system of the driver through optical fiber.

[0027] As Figure 5 shown, the adjustable power supply system of the driver consists of a sampled current processing module, a parallel system of power supply modules, and a control system.

[0028] In this embodiment, the parallel system of power supply modules includes a first power supply subsystem and a second power supply subsystem; both the first power supply subsystem and the second power supply subsystem are composed of multiple standardized modules in parallel; the first power supply subsystem supplies power to the first driver, and the second power supply subsystem supplies power to the second driver.

[0029] Exemplarily, the parallel system of power supply modules can also be configured as: including at least two power supply subsystems; each power supply subsystem corresponds to supplying power to the driver of an IGCT device; each power supply subsystem is composed of multiple standardized modules in parallel, and the standardized modules are redundant with each other; the power supply subsystems are redundant with each other; when a certain power supply subsystem fails, the remaining power supply subsystems can be used as backup subsystems, improving the reliability and fault tolerance of the system and ensuring stable power supply for the driver under various working conditions.

[0030] Based on the design idea of the above-mentioned adjustable power supply method for the driver of the IGCT-MMC flexible DC sub-module, as Figure 6 shown, this embodiment provides an adjustable power supply method for the driver of the IGCT-MMC flexible DC sub-module, and the steps are as follows: Collect the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module; Obtain the IGCT device turn-off current based on the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module; Calculate the required power supply power of the driver based on the functional relationship between the IGCT device turn-off current and the required power supply power of the driver and the IGCT device turn-off current; Dynamically configure the number of standardized modules in the energy supply module parallel system according to the required energy supply power of the driver; the energy supply module parallel system is composed of multiple standardized modules in parallel, and each standardized module is redundant with each other.

[0031] Exemplarily, the more detailed steps of the adjustable energy supply method for the driver are as follows: First step: Collect the port current of the IGCT-MMC flexible DC sub-module through the current acquisition device configured at the port of the IGCT-MMC flexible DC sub-module.

[0032] Second step: Obtain the switching mode of the IGCT-MMC flexible DC sub-module through the main control board of the IGCT-MMC flexible DC sub-module.

[0033] Third step: Calculate the turn-off current of the IGCT device by calculating the port current of the IGCT-MMC flexible DC sub-module and the switching mode of the IGCT-MMC flexible DC sub-module. The specific formula is as follows: In the formula, represents the turn-off current of the first IGCT device; represents the turn-off current of the second IGCT device; represents the port current of the IGCT-MMC flexible DC sub-module; S takes a value of 0 or 1; represents the switching mode of the IGCT-MMC flexible DC sub-module. Among them, when the switching mode of the IGCT-MMC flexible DC sub-module is the input mode, then S = 1; when the switching mode of the IGCT-MMC flexible DC sub-module is the cut-out mode, then S = 0.

[0034] Fourth step: Input the turn-off current of the IGCT device into the functional relationship between the turn-off current of the IGCT device and the required energy supply power of the driver, and calculate the required energy supply power of the driver. The specific calculation formula is as follows: In the formula, represents the required energy supply power of the first driver; represents the turn-off current of the first IGCT device; represents the required energy supply power of the second driver; represents the turn-off current of the second IGCT device; Fifth step: Calculate the number of standardized modules in the energy supply module parallel system according to the required energy supply power of the driver. The specific calculation formula is as follows: In the formula, represents the number of standardized modules configured in the first energy supply subsystem; represents the number of standardized modules configured in the second energy supply subsystem; Represents the output power of a single standardized module; Represents the power required for the first driver; Represents the power required for the second driver; Among them, the power supply module parallel system includes a first power supply subsystem and a second power supply subsystem; both the first power supply subsystem and the second power supply subsystem are composed of multiple standardized modules in parallel; the first power supply subsystem supplies power to the first driver, and the second power supply subsystem supplies power to the second driver.

[0035] Thus, through the above-mentioned driver adjustable power supply method, the number of standardized modules in the first power supply subsystem and the number of standardized modules in the second power supply subsystem are dynamically adjusted. Here, it should be noted that; the number of standardized modules finally adjusted by this method is the number of standardized modules to be put into use; rather than the total number of standardized modules.

[0036] Exemplarily, in the above steps, the order of the first step and the second step can be interchanged or carried out simultaneously.

[0037] Based on the above design idea of the driver adjustable power supply system for IGCT-MMC flexible sub-modules, as Figure 7 shown, this embodiment provides a driver adjustable power supply system for IGCT-MMC flexible sub-modules, which specifically includes: a sampling current processing module, a power supply module parallel system, and a control system; Among them, as combined with Figure 5 shown, the sampling current processing module converts the port current sent by the current acquisition device at the port of the IGCT-MMC flexible sub-module, and transmits the port current after data conversion to the control system.

[0038] Also as Figure 5 shown, in this embodiment, the power supply module parallel system in the driver adjustable power supply system includes two power supply subsystems, namely a first power supply subsystem and a second power supply subsystem; each power supply subsystem is composed of N standardized modules in parallel, the first power supply subsystem supplies power to the first driver, and the second power supply subsystem supplies power to the second driver; the output power of a single standardized module is , that is, the maximum output power of the entire power supply subsystem is , and each standardized module is redundant with each other. The output power can be adjusted through the control system, and the adjustment step value is .

[0039] In this embodiment, the first calculation module obtains the IGCT device turn-off current according to the port current of the IGCT-MMC flexible sub-module and the switching mode of the IGCT-MMC flexible sub-module: In the formula, represents the turn-off current of the first IGCT device; represents the turn-off current of the second IGCT device; represents the port current of the IGCT-MMC flexible DC sub-module; S takes the value of 0 or 1; represents the switching mode of the IGCT-MMC flexible DC sub-module. Among them, when the switching mode of the IGCT-MMC flexible DC sub-module is the input mode, then S = 1; when the switching mode of the IGCT-MMC flexible DC sub-module is the cut-out mode, then S = 0.

[0040] The second calculation module calculates the energy supply power required by the driver according to the functional relationship between the turn-off current of the IGCT device and the energy supply power required by the driver, and the switching mode of the IGCT-MMC flexible DC sub-module: In the formula, represents the energy supply power required by the first driver; represents the turn-off current of the first IGCT device; represents the energy supply power required by the second driver; represents the turn-off current of the second IGCT device; Among them, the functional relationship between the turn-off current of the IGCT device and the energy supply power required by the driver is obtained by fitting the historical turn-off current of the IGCT device and the historical energy supply power required by the driver; The power configuration module dynamically configures the number of standardized modules in the energy supply module parallel system according to the energy supply power required by the driver; specifically: dynamically configures the number of standardized modules in the first energy supply subsystem, and dynamically configures the number of standardized modules in the second energy supply subsystem, that is, after obtaining the energy supply power required by the driver, controls the energy supply module parallel system, that is, configures the number of standardized modules to be input this time , the specific formula is: In the formula, represents the number of standardized modules configured in the first energy supply subsystem; represents the number of standardized modules configured in the second energy supply subsystem; represents the output power of a single standardized module; represents the energy supply power required by the first driver; represents the energy supply power required by the second driver; Among them, the energy supply module parallel system includes a first energy supply subsystem and a second energy supply subsystem; both the first energy supply subsystem and the second energy supply subsystem are composed of multiple standardized modules connected in parallel; the first energy supply subsystem supplies energy to the first driver, and the second energy supply subsystem supplies energy to the second driver.

[0041] Exemplarily, taking the first IGCT device (upper tube IGCT device) as an example, the energy supply component of its corresponding first driver is the first energy supply subsystem; now, calculate the number of standardized modules in the first energy supply subsystem. If the output power of a single standardized module is , the total number of standardized modules N = 7, and the port current of the IGCT-MMC flexible DC sub-module collected is ; then the number of standardized modules that need to be invested in the first energy supply subsystem is: It can be seen that when the switching mode of the IGCT-MMC flexible DC sub-module is the input mode, the number of standardized modules that need to be invested is 5. When the switching mode of the IGCT-MMC flexible DC sub-module is the cut-out mode, the number of standardized modules that need to be invested is 2; the adjustable energy supply method for the driver of the second IGCT device (lower tube IGCT device) is the same and will not be elaborated here.

[0042] In summary, the present invention provides an adjustable energy supply method and system for the driver of the IGCT-MMC flexible DC sub-module, which has the following advantages: With the increasing maturity of the application of flexible DC transmission technology, the short-cycle execution and high-reliability operation of the project have become the focus of attention. The flexible DC converter valve based on IGCT devices has broad application prospects in scenarios such as long-distance onshore DC power transmission, back-to-back networking, new energy access, and DC distribution networks. Different from IGBT devices, the IGCT device requires a relatively large driver energy supply for turning off. By configuring the energy supply power according to the current that needs to be turned off by the detection device, some modules can be in a light load state, greatly improving the operation efficiency. At the same time, each module is redundant with each other, reducing the probability of failure of the IGCT-MMC flexible DC sub-module caused by abnormal driver energy supply. In addition, since the modules in the energy supply module parallel system are all designed in a standardized manner, it is beneficial to the batch production efficiency and can adapt to different power requirements by increasing or decreasing the modules. The adjustable energy supply method for the driver of the IGCT-MMC flexible DC sub-module can achieve power distribution on demand, high-efficiency production, and high-reliability operation, and is particularly suitable for scenarios with high requirements for the project execution cycle and operation reliability.

[0043] The above embodiments are only one of the implementation manners that can realize the technical solution of the present invention. The scope of protection required by the present invention is not only limited by this embodiment, but also includes any changes, substitutions, and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A driver adjustable energy supply method for IGCT-MMC flexible direct submodule, characterized in that: include: Collect the port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule; The IGCT device turn-off current is obtained based on the port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule; Based on the functional relationship between the IGCT device turn-off current and the driver's required energy supply power and the IGCT device turn-off current, the driver's required energy supply power is calculated; According to the energy supply power required by the driver, the number of standardized modules of the energy supply module parallel system is dynamically configured; the energy supply module parallel system is composed of multiple standardized modules in parallel, and each standardized module is redundant to each other.

2. A driver adjustable energy supply method for an IGCT-MMC flexible direct submodule according to claim 1, characterized in that: The collecting of the port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule includes: The port current of the IGCT-MMC flexible direct current submodule is collected by a current collection device configured at the port of the IGCT-MMC flexible direct current submodule; the current collection device adopts a Hall sensor or a Rogowski coil; The switching mode of the IGCT-MMC flexible direct current submodule is obtained by uploading it through the IGCT-MMC flexible direct current submodule main control board.

3. A driver adjustable energy supply method for an IGCT-MMC flexible direct current submodule according to claim 1, characterized in that: The method of obtaining the IGCT device turn-off current based on the port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule includes: The port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule are calculated to obtain the IGCT device turn-off current. The specific formula is as follows: In the formula, Indicates the turn-off current of the first IGCT device; Indicates the turn-off current of the second IGCT device; It represents the port current of the IGCT-MMC flexible direct current submodule; S takes the value of 0 or 1; it represents the switching mode of the IGCT-MMC flexible direct current submodule, where when the switching mode of the IGCT-MMC flexible direct current submodule is the switching mode, S=1; when the switching mode of the IGCT-MMC flexible direct current submodule is the switching mode, S=0.

4. The method for adjustable energy supply of a driver for an IGCT-MMC flexible direct current submodule according to claim 1, characterized in that: The calculation of the required power supply of the driver based on the functional relationship between the IGCT device turn-off current and the required power supply of the driver and the IGCT device turn-off current includes: The IGCT device turn-off current is input into the functional relationship between the IGCT device turn-off current and the required power supply of the driver to calculate the required power supply of the driver. The specific calculation formula is as follows: In the formula, Indicates the power required by the first driver; Indicates the turn-off current of the first IGCT device; Indicates the energy supply power required by the second drive; Indicates the turn-off current of the second IGCT device; The functional relationship between the turn-off current of the IGCT device and the energy supply power required by the driver is obtained by fitting the historical data of the turn-off current of the IGCT device and the historical data of the energy supply power required by the driver.

5. The method for adjustable energy supply of a driver for an IGCT-MMC flexible direct current submodule according to claim 1, characterized in that: The method of dynamically configuring the number of standardized modules of the energy supply module parallel system according to the energy supply power required by the driver includes: According to the energy supply power required by the driver, the number of standardized modules in the energy supply module parallel system is calculated. The specific calculation formula is as follows: In the formula, Indicates the number of standardized modules configured in the first energy supply subsystem; Indicates the number of standardized modules configured in the second energy supply subsystem; Indicates the output power of a single standardized module; Indicates the power required by the first driver; Indicates the energy supply power required by the second drive; Among them, the energy supply module parallel system includes a first energy supply subsystem and a second energy supply subsystem; the first energy supply subsystem and the second energy supply subsystem are both composed of multiple standardized modules in parallel; the first energy supply subsystem supplies energy to the first driver, and the second energy supply subsystem supplies energy to the second driver.

6. A driver adjustable energy supply system for IGCT-MMC flexible direct submodule, characterized in that: include: Sampling current processing module, energy supply module parallel system and control system; The sampling current processing module is used to transmit the collected port current of the IGCT-MMC flexible direct current submodule to the control system for data conversion, and transmit the port current of the IGCT-MMC flexible direct current submodule after data conversion to the control system; The control system comprises: A first calculation module is used to obtain the IGCT device turn-off current based on the port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule; The second calculation module is used to calculate the energy supply power required by the driver based on the functional relationship between the IGCT device turn-off current and the energy supply power required by the driver and the switching mode of the IGCT-MMC flexible direct current submodule; A power configuration module, used to dynamically configure the number of standardized modules in the energy supply module parallel system according to the energy supply power required by the driver; the energy supply module parallel system is composed of multiple standardized modules in parallel, and each standardized module is redundant with each other; The energy supply module parallel system is used to supply energy to the driver of the IGCT device.

7. A driver adjustable energy supply system for IGCT-MMC flexible direct submodule according to claim 6, characterized in that: The sampling current processing module is used to perform data conversion on the collected port current system of the IGCT-MMC flexible direct current submodule, and transmit the port current of the IGCT-MMC flexible direct current submodule after data conversion to the control system; The sampling current processing module is connected to a current acquisition device configured at a port of the IGCT-MMC flexible direct current submodule; The current collection device adopts a Hall sensor or a Rogowski coil.

8. The driver adjustable energy supply system for IGCT-MMC flexible direct submodule according to claim 6, characterized in that: The switching mode of the IGCT-MMC flexible direct current submodule is transmitted to the control system by the IGCT-MMC flexible direct current submodule main control board.

9. The driver adjustable energy supply system for IGCT-MMC flexible direct submodule according to claim 6, characterized in that: The method of obtaining the IGCT device turn-off current based on the port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule includes: The port current of the IGCT-MMC flexible direct current submodule and the switching mode of the IGCT-MMC flexible direct current submodule are calculated to obtain the IGCT device turn-off current. The specific formula is as follows: In the formula, Indicates the turn-off current of the first IGCT device; Indicates the turn-off current of the second IGCT device; Indicates the port current of the IGCT-MMC flexible direct current submodule; S takes the value of 0 or 1; indicates the switching mode of the IGCT-MMC flexible direct current submodule, wherein, when the switching mode of the IGCT-MMC flexible direct current submodule is the switching mode, S=1; when the switching mode of the IGCT-MMC flexible direct current submodule is the switching mode, S=0; The calculation of the required power supply of the driver based on the functional relationship between the IGCT device turn-off current and the required power supply of the driver and the IGCT device turn-off current includes: The IGCT device turn-off current is input into the functional relationship between the IGCT device turn-off current and the required power supply of the driver to calculate the required power supply of the driver. The specific calculation formula is as follows: In the formula, Indicates the power required by the first driver; Indicates the turn-off current of the first IGCT device; Indicates the energy supply power required by the second drive; Indicates the turn-off current of the second IGCT device; The functional relationship between the IGCT device turn-off current and the driver required energy supply power is obtained by fitting the historical IGCT device turn-off current and the historical driver required energy supply power; The method of dynamically configuring the number of standardized modules of the energy supply module parallel system according to the energy supply power required by the driver includes: According to the energy supply power required by the driver, the number of standardized modules in the energy supply module parallel system is calculated. The specific calculation formula is as follows: In the formula, Indicates the number of standardized modules configured in the first energy supply subsystem; Indicates the number of standardized modules configured in the second energy supply subsystem; Indicates the output power of a single standardized module; Indicates the power required by the first driver; Indicates the energy supply power required by the second drive; Among them, the energy supply module parallel system includes a first energy supply subsystem and a second energy supply subsystem; the first energy supply subsystem and the second energy supply subsystem are both composed of multiple standardized modules in parallel; the first energy supply subsystem supplies energy to the first driver, and the second energy supply subsystem supplies energy to the second driver.

10. The driver adjustable energy supply system for IGCT-MMC flexible direct submodule according to claim 6, characterized in that: The energy supply module parallel system includes at least two energy supply subsystems; each energy supply subsystem supplies energy to a driver of an IGCT device; each energy supply subsystem is composed of multiple standardized modules in parallel, and the standardized modules are redundant with each other; the energy supply subsystems are redundant with each other.

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