A driver adjustable energy supply method and system for IGCT-MMC flexible direct current submodule

Abstract

This invention belongs to the field of flexible DC transmission and discloses a method and system for adjustable power supply of the driver for IGCT-MMC flexible DC submodules. This method calculates the IGCT device turn-off current by collecting port current and switching modes, and then determines the required power supply based on the functional relationship between the turn-off current and the required power supply of the driver. By monitoring the submodule status in real time, the number of standardized modules in the parallel power supply module system is dynamically adjusted to achieve on-demand power allocation. Since the IGCT device turn-off current is proportional to the required power, configuring the number of modules by accurately calculating the turn-off current can effectively avoid power waste and improve power supply efficiency. This method not only achieves flexible adjustment of the driver's power supply but also improves system reliability through module redundancy design, meeting the design requirements of compactness, lightweight design, and low loss of IGCT-MMC power submodules, and achieving efficient production and highly reliable operation.

Description

Technical Field

[0001] This invention belongs to the field of flexible DC transmission technology, specifically relating to an adjustable power supply method and system for a driver used in IGCT-MMC flexible DC submodules. Background Technology

[0002] The consumption and transmission of new energy sources have spurred a huge demand for new power systems. Flexible DC transmission technology, as a novel transmission method, offers advantages such as flexible control, small converter station footprint, and applicability to various power grid structures, providing strong technical support for the grid connection and transmission of new energy sources. However, most of the flexible DC transmission projects currently in operation or under construction use IGBTs as switching devices. Although IGBT devices perform well in certain aspects, their manufacturing process is complex and has high technical barriers, resulting in a relatively low proportion of domestically produced IGBT devices. In contrast, IGCT devices offer advantages such as high current capacity, high blocking voltage, high reliability, compact structure, and low conduction loss, while also being low-cost, having a high yield rate, and enabling fully domestically produced designs. Therefore, IGCT devices have broad application prospects in the field of flexible DC transmission.

[0003] However, IGCT devices and IGBT devices differ significantly in their driving methods. IGCT devices are current-source controlled devices, and their turn-off requires a driver, consuming considerable power. Furthermore, the turn-off current is directly proportional to the required power, placing high demands on the driver's power supply. As submodule designs become increasingly compact, lightweight, and low-loss-prone, providing a highly reliable and low-loss adjustable driver power supply method for IGCT-MMC flexible DC submodules has become a pressing issue. Existing technologies largely focus on fault handling and dynamic characteristic testing of IGCT-MMC power submodules, without addressing improvements in driver power supply methods.

[0004] It is evident that there is currently a lack of a power supply regulation scheme for the driver of the IGCT-MMC power submodule, which makes it impossible to achieve on-demand power allocation, efficient production, and high-reliability operation. Summary of the Invention

[0005] This invention provides an adjustable power supply method and system for a driver of an IGCT-MMC flexible DC submodule, in order to solve the technical problem that the reliability of the bypass switch in the frequent closing test under load cannot be effectively verified due to the lack of test measures that can simulate the operating conditions of the bypass switch in the flexible DC transmission system.

[0006] To achieve the above objectives, the present invention employs the following technical content:

[0007] In a first aspect, the present invention provides an adjustable power supply method for a driver of an IGCT-MMC flexible straight submodule, comprising: acquiring the port current and switching mode of the IGCT-MMC flexible straight submodule; obtaining the IGCT device turn-off current based on the port current and switching mode of the IGCT-MMC flexible straight submodule; calculating the required power supply for the driver based on the functional relationship between the IGCT device turn-off current and the required power supply for the driver, and the IGCT device turn-off current; dynamically configuring the number of standardized modules in the parallel power supply module system according to the required power supply for the driver; wherein the parallel power supply module system consists of multiple standardized modules connected in parallel, and each standardized module is redundant with the others.

[0008] Secondly, the present invention provides an adjustable power supply system for a driver of an IGCT-MMC flexible straight submodule, including a sampling current processing module, a power supply module parallel system, and a control system; the sampling current processing module is used to transmit the port current of the IGCT-MMC flexible straight submodule to the control system for data conversion, and transmit the port current of the IGCT-MMC flexible straight submodule after data conversion to the control system.

[0009] The control system includes: a first calculation module for obtaining the IGCT device turn-off current based on the port current of the IGCT-MMC flexible straightener submodule and the switching mode of the IGCT-MMC flexible straightener submodule; a second calculation module for calculating the power required by the driver based on the functional relationship between the IGCT device turn-off current and the power required by the driver, and the switching mode of the IGCT-MMC flexible straightener submodule; and a power configuration module for dynamically configuring the number of standardized modules in the parallel power supply module system according to the power required by the driver; the parallel power supply module system consists of multiple standardized modules connected in parallel, with redundancy between each standardized module; and the parallel power supply module system is used to power the driver of the IGCT device.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This invention provides an adjustable power supply method for the driver of an IGCT-MMC flexible DC submodule. This method calculates the IGCT device turn-off current by collecting port current and switching modes, and then determines the required power supply based on the functional relationship between the turn-off current and the driver's required power. By monitoring the submodule status in real time, the number of standardized modules in the parallel power supply system is dynamically adjusted to achieve on-demand power allocation. Since the IGCT device turn-off current is proportional to the required power, configuring the number of modules by accurately calculating the turn-off current can effectively avoid power waste and improve power supply efficiency. This method not only achieves flexible adjustment of the driver's power supply but also improves system reliability through module redundancy design, meeting the design requirements of compactness, lightweight design, and low loss for IGCT-MMC power submodules, and achieving efficient production and highly reliable operation.

[0012] This invention also provides an adjustable power supply system for the driver of an IGCT-MMC flexible straightener submodule, including a sampling current processing module, a parallel power supply module system, and a control system. The system collects and transmits port current to the control system via the sampling current processing module. A first calculation module within the control system calculates the IGCT device turn-off current based on the switching mode. A second calculation module then calculates the required power supply based on the functional relationship between the turn-off current and the driver's required power. The power configuration module dynamically configures the number of modules in the parallel power supply module system accordingly. The parallel power supply module system consists of multiple redundant standardized modules. By accurately calculating the turn-off current and required power, this system enables on-demand configuration of the power supply modules, improving the flexibility and reliability of power supply, meeting the high power requirements of the IGCT-MMC flexible straightener submodule, and achieving efficient power distribution and reliable system operation. Attached Figure Description

[0013] Figure 1 A schematic diagram of the topology of the IGCT-MMC flexible straight submodule provided in an embodiment of the present invention;

[0014] Figure 2 A curve showing the turn-off current of a 6500V / 4000A IGCT device versus the power required by the driver, provided for an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the switching modes of the IGCT-MMC flexible straight submodule provided in an embodiment of the present invention; wherein, (a) is the input mode and the port current is greater than 0; (b) is the output 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 output mode and the port current is less than 0.

[0016] Figure 4 This is a connection diagram of the driver adjustable power supply system provided in an embodiment of the present invention;

[0017] Figure 5 A schematic block diagram of the driver adjustable power supply system provided in an embodiment of the present invention;

[0018] Figure 6 A flowchart illustrating an adjustable power supply method for a driver in an IGCT-MMC flexible straight submodule, provided as an embodiment of the present invention;

[0019] Figure 7 This is a schematic diagram of a driver adjustable power supply system for an IGCT-MMC flexible straight submodule provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The technical terms used in this invention are now explained:

[0027] The IGCT-MMC power submodule is a basic building block in the Modular Multilevel Converter (MMC). It incorporates Integrated Gate Commutated Thyristor (IGCT) technology to achieve efficient power conversion and control.

[0028] IGBT stands for Insulated Gate Bipolar Transistor. It is a composite, fully controllable, voltage-driven power semiconductor device that combines the characteristics of a metal-oxide-semiconductor field-effect transistor (MOSFET) and a bipolar junction transistor (BJT).

[0029] As mentioned in the background section, there is currently a lack of a power regulation scheme for the driver power supply of IGCT-MMC power submodules, which makes it impossible to achieve on-demand power allocation, efficient production, and high-reliability operation.

[0030] To address the aforementioned issues, this invention provides an adjustable power supply method for the driver of an IGCT-MMC flexible straightener submodule. This method matches the driver's power supply in real-time by detecting the operating current of the IGCT power devices within the submodule. The driver is powered using a parallel controllable power supply, i.e., a parallel power supply module system. This system consists of multiple standardized modules. During operation, a corresponding number of standardized modules are activated based on power demand. When the IGCT-MMC flexible straightener submodule operates at low current, the parallel power supply module system only activates a portion of the standardized modules, improving output efficiency. Furthermore, in the event of a single standardized module failure, the system can proactively switch to a backup standardized module, further enhancing operational reliability. Moreover, using standardized modules also reduces manufacturing costs, increases configuration flexibility, and facilitates batch consistency and configuration diversity in products.

[0031] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0032] For example, such as Figure 1 As shown, this embodiment provides a topology for an IGCT-MMC flexible straight submodule:

[0033] The IGCT-MMC flexible DC module includes fully controllable switching devices S1 and S2; diodes D1 and D2; DC capacitor C; bypass switch K; anode reactance Li; and clamping diode D. CL Clamping resistor R CL Clamping capacitor C CL 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.

[0034] The IGCT devices in the IGCT-MMC flexible straight submodule require power from their drivers when turned off, such as Figure 2 As shown, Figure 2 This demonstrates the turn-off current of the IGCT device and the power required by the driver. Figure 2 The relationship between (hereinafter referred to as driver power);

[0035] That is, by plotting historical data of IGCT device turn-off current and historical data of driver power requirements, the following graph is obtained. Figure 2 By fitting the curve in the figure, we can obtain the function relating the turn-off current of the IGCT device to the power required by the driver:

[0036]

[0037] In the formula, Indicates the power required by the driver; This indicates the turn-off current of the IGCT device.

[0038] like Figure 3 As shown, specifically as follows Figure 3 As shown in (a), (b), (c), and (d), the IGCT-MMC flexible DC submodule has two main switching modes in the system: input mode and output mode. Let S represent the switching mode of the IGCT-MMC flexible DC submodule. When S=1, it indicates that the IGCT-MMC flexible DC submodule is operating in input mode; when S=0, it indicates that the IGCT-MMC flexible DC submodule is operating in output mode. The port current varies under different switching modes. The orientation determines the operating state of the internal components of the IGCT-MMC flexible straight submodule.

[0039] When the IGCT-MMC flexible straightener module is in the input mode, when the port current... At that time, all current flows through D1, and when the port current... At this time, all current flows through S1; the IGCT-MMC flexible DC submodule is in cut-out mode, when the port current... At that time, all current flows through S2, and when the port current... At this time, all current flows through D2. Therefore, the required power supply for the IGCT device driver can be pre-configured by combining the port current of the IGCT-MMC flexible straightener submodule and the switching mode of the IGCT-MMC flexible straightener submodule.

[0040] like Figure 4 As shown, in the IGCT-MMC flexible DC submodule, the driver adjustable power supply system obtains energy from the DC capacitor, and after internal conversion, outputs it to the upper IGCT driver (first driver) and the lower IGCT driver (second driver).

[0041] On one hand, the IGCT-MMC flexible straightener submodule port is equipped with a current acquisition device, which can be a Hall sensor or a Rogowski coil. The current acquisition device inputs the acquired information (the port current of the IGCT-MMC flexible straightener submodule) to the driver's adjustable power supply system. On the other hand, the IGCT-MMC flexible straightener submodule main control board transmits the switching mode status to the driver's adjustable power supply system via optical fiber.

[0042] like Figure 5 As shown, the driver's adjustable power supply system consists of a sampling current processing module, a parallel power supply module system, and a control system.

[0043] In this embodiment, the parallel power supply module 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 connected 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.

[0044] For example, the parallel power supply module system can also be configured to include at least two power supply subsystems; each power supply subsystem corresponds to powering the driver of an IGCT device; each power supply subsystem consists of multiple standardized modules connected in parallel, with redundancy between the standardized modules; each power supply subsystem is redundant with each other; when a power supply subsystem fails, the remaining power supply subsystems can serve as backup subsystems, improving the reliability and fault tolerance of the system and ensuring stable power supply to the driver under various operating conditions.

[0045] Based on the design concept of the adjustable power supply method for the driver of the IGCT-MMC flexible straight submodule, such as Figure 6 As shown, this embodiment provides an adjustable power supply method for a driver in an IGCT-MMC flexible straight submodule, the steps of which are as follows:

[0046] The port current and switching mode of the IGCT-MMC flexible straightening submodule are collected.

[0047] The IGCT device turn-off current is obtained based on the port current of the IGCT-MMC flexible straight submodule and the switching mode of the IGCT-MMC flexible straight submodule.

[0048] Based on the functional relationship between the turn-off current of the IGCT device and the power required by the driver, and the turn-off current of the IGCT device, the power required by the driver is calculated.

[0049] The number of standardized modules in the parallel power supply system is dynamically configured according to the power required by the driver; the parallel power supply system consists of multiple standardized modules connected in parallel, and each standardized module is redundant with the others.

[0050] For example, the adjustable power supply method for the driver has the following more detailed steps:

[0051] The first step is to acquire the port current of the IGCT-MMC flexible straightener module by using a current acquisition device configured at the port of the IGCT-MMC flexible straightener module.

[0052] The second step is to upload the switching mode of the IGCT-MMC flexible straight submodule through the main control board of the IGCT-MMC flexible straight submodule.

[0053] The third step is to calculate the port current of the IGCT-MMC flexible straightener submodule and the switching mode of the IGCT-MMC flexible straightener submodule to obtain the IGCT device turn-off current. The specific formula is as follows:

[0054]

[0055] In the formula, This indicates the turn-off current of the first IGCT device; This indicates the turn-off current of the second IGCT device; This represents the port current of the IGCT-MMC flexible straightener submodule; S takes the value 0 or 1; it represents the switching mode of the IGCT-MMC flexible straightener submodule, where S=1 when the switching mode of the IGCT-MMC flexible straightener submodule is the input mode; and S=0 when the switching mode of the IGCT-MMC flexible straightener submodule is the output mode.

[0056] Step 4: Input the IGCT device turn-off current into the functional relationship between the IGCT device turn-off current and the power required by the driver, and calculate the power required by the driver. The specific calculation formula is as follows:

[0057]

[0058] In the formula, Indicates the power required by the first driver; This indicates the turn-off current of the first IGCT device; Indicates the power required by the second driver; This indicates the turn-off current of the second IGCT device;

[0059] Step 5: Based on the power required by the driver, calculate the number of standardized modules in the parallel power supply system. The specific calculation formula is as follows:

[0060]

[0061] In the formula, This indicates the number of standardized modules configured in the first power supply subsystem; This indicates the number of standardized modules configured in the second power supply subsystem; This indicates the output power of a single standardized module; Indicates the power required by the first driver; Indicates the power required by the second driver;

[0062] The parallel power supply module system includes a first power supply subsystem and a second power supply subsystem; both the first and second power supply subsystems are composed of multiple standardized modules connected 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.

[0063] Thus, through the aforementioned 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 have been dynamically adjusted. It should be noted here that the number of standardized modules ultimately adjusted by this method is the number of standardized modules to be put into use, and not the total number of standardized modules.

[0064] For example, in the above steps, the order of the first and second steps can be interchanged, or they can be performed simultaneously.

[0065] Based on the above design concept of the adjustable power supply system for the driver of the IGCT-MMC flexible straight submodule, such as Figure 7 As shown, this embodiment provides an adjustable power supply system for the driver of the IGCT-MMC flexible straight submodule, specifically including: a sampling current processing module, a power supply module parallel system, and a control system;

[0066] Among them, combined Figure 5 As shown, the sampling current processing module converts the port current sent by the current acquisition device of the IGCT-MMC flexible straight sub-module port into data, and transmits the converted port current to the control system.

[0067] Another example Figure 5 As shown, in this embodiment, the parallel power supply module system in the driver adjustable power supply system includes two power supply subsystems: a first power supply subsystem and a second power supply subsystem. Each power supply subsystem consists of N standardized modules connected in parallel. The first power supply subsystem powers the first driver, and the second power supply subsystem powers 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 Each standardized module is redundant. Output power can be adjusted via the control system, with adjustment steps of [value missing]. .

[0068] In this embodiment, the first calculation module obtains the IGCT device turn-off current based on the port current of the IGCT-MMC flexible straightening submodule and the switching mode of the IGCT-MMC flexible straightening submodule:

[0069]

[0070] In the formula, This indicates the turn-off current of the first IGCT device; This indicates the turn-off current of the second IGCT device; This represents the port current of the IGCT-MMC flexible straightener submodule; S takes the value 0 or 1; it represents the switching mode of the IGCT-MMC flexible straightener submodule, where S=1 when the switching mode of the IGCT-MMC flexible straightener submodule is the input mode; and S=0 when the switching mode of the IGCT-MMC flexible straightener submodule is the output mode.

[0071] The second calculation module calculates the power required by the driver based on the functional relationship between the IGCT device turn-off current and the power required by the driver, as well as the switching mode of the IGCT-MMC flexible DC submodule.

[0072]

[0073] In the formula, Indicates the power required by the first driver; This indicates the turn-off current of the first IGCT device; Indicates the power required by the second driver; This indicates the turn-off current of the second IGCT device;

[0074] The functional relationship between the turn-off current of the IGCT device and the power required by the driver is obtained by fitting the historical turn-off current of the IGCT device and the historical power required by the driver.

[0075] The power configuration module dynamically configures the number of standardized modules in the parallel power supply module system based on the power required by the driver. Specifically, it dynamically configures the number of standardized modules in the first power supply subsystem and the number of standardized modules in the second power supply subsystem. In other words, after obtaining the power required by the driver, it controls the parallel power supply module system, which means configuring the number of standardized modules to be deployed in this operation. The specific formula is as follows:

[0076]

[0077] In the formula, This indicates the number of standardized modules configured in the first power supply subsystem; This indicates the number of standardized modules configured in the second power supply subsystem; This indicates the output power of a single standardized module; Indicates the power required by the first driver; Indicates the power required by the second driver;

[0078] The parallel power supply module system includes a first power supply subsystem and a second power supply subsystem; both the first and second power supply subsystems are composed of multiple standardized modules connected 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.

[0079] For example, taking the first IGCT device (upper-tube IGCT device) as an example, the power supply component of its corresponding first driver is the first power supply subsystem; now, the number of standardized modules in the first power supply subsystem is calculated, if the output power of a single standardized module is... The total number of standardized modules is N=7, and the port current of the IGCT-MMC flexible straight submodule is collected. The number of standardized modules required for the first power supply subsystem is:

[0080]

[0081] As can be seen, when the switching mode of the IGCT-MMC flexible straight submodule is the input mode, the number of standardized modules required is 5. When the switching mode of the IGCT-MMC flexible straight submodule is the output mode, the number of standardized modules required is 2. The same applies to the adjustable power supply method of the driver for the second IGCT device (lower IGCT device), which will not be elaborated here.

[0082] In summary, this invention provides an adjustable power supply method and system for the driver of an IGCT-MMC flexible straight submodule, which has the following advantages:

[0083] With the increasing maturity of flexible DC transmission technology, short-cycle execution and high-reliability operation have become key concerns. Flexible DC converter valves based on IGCT devices have broad application prospects in scenarios such as long-distance onshore DC power transmission, back-to-back grid interconnection, renewable energy access, and DC distribution networks. Unlike IGBT devices, IGCT devices require a larger driver power supply for turn-off. By configuring the power supply based on the current required for turn-off by the detection device, some modules can operate under light load, significantly improving operating efficiency. Simultaneously, redundancy between modules reduces the probability of IGCT-MMC flexible DC submodule failure due to driver power supply anomalies. Furthermore, the standardized design of modules in the parallel power supply system facilitates mass production efficiency and allows for adaptation to different power requirements by adding or removing modules. The adjustable driver power supply method of the IGCT-MMC flexible DC submodule enables on-demand power allocation, efficient production, and high-reliability operation, making it particularly suitable for scenarios with high requirements for project execution cycles and operational reliability.

[0084] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. An adjustable power supply method for a driver in an IGCT-MMC flexible straight submodule, characterized in that, include: The port current and switching mode of the IGCT-MMC flexible straightening submodule are collected. The IGCT device turn-off current is obtained based on the port current of the IGCT-MMC flexible straight submodule and the switching mode of the IGCT-MMC flexible straight submodule. Based on the functional relationship between the turn-off current of the IGCT device and the power required by the driver, and the turn-off current of the IGCT device, the power required by the driver is calculated. The number of standardized modules in the parallel power supply system is dynamically configured according to the power required by the driver; the parallel power supply system consists of multiple standardized modules connected in parallel, and each standardized module is redundant with the others. 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, including: The IGCT device turn-off current is obtained by calculating the port current of the IGCT-MMC flexible straightener submodule and the switching mode of the IGCT-MMC flexible straightener submodule. The specific formula is as follows: In the formula, I off(S1) Indicates the turn-off current of the first IGCT device; I off(S2) Indicates the turn-off current of the second IGCT device; I b This represents the port current of the IGCT-MMC flexible DC module; S takes the value 0 or 1; it represents the switching mode of the IGCT-MMC flexible DC module, where S=1 when the switching mode of the IGCT-MMC flexible DC module is the input mode; and S=0 when the switching mode of the IGCT-MMC flexible DC module is the output mode. The calculation of the driver's required power supply based on the functional relationship between the IGCT device's turn-off current and the driver's required power supply, and the IGCT device's 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 power required by the driver. The power required by the driver is calculated using the following formula: In the formula, P driver（S1） Indicates the power required by the first driver; I off(S1) P represents the turn-off current of the first IGCT device; driver（S2） Indicates the power required by the second driver; I off(S2) This indicates the turn-off current of the second IGCT device; The functional relationship between the turn-off current of the IGCT device and the power required by the driver is obtained by fitting historical data of the turn-off current of the IGCT device and historical data of the power required by the driver.

2. The adjustable power supply method for a driver in an IGCT-MMC flexible straight submodule according to claim 1, characterized in that, The acquisition of the port current and switching mode of the IGCT-MMC flexible DC submodule includes: The port current of the IGCT-MMC flexible straight submodule is acquired by a current acquisition device configured at the port of the IGCT-MMC flexible straight submodule; the current acquisition device adopts a Hall sensor or a Rogowski coil. The switching mode of the IGCT-MMC flexible straight submodule is obtained by uploading data from the main control board of the IGCT-MMC flexible straight submodule.

3. The adjustable power supply method for a driver in an IGCT-MMC flexible straight submodule according to claim 1, characterized in that, The method of dynamically configuring the number of standardized modules in the parallel power supply module system according to the power required by the driver includes: Based on the power required by the driver, the number of standardized modules in the parallel power supply module system is calculated. The specific calculation formula is as follows: In the formula, This indicates the number of standardized modules configured in the first power supply subsystem; This indicates the number of standardized modules configured in the second power supply subsystem; P represents the output power of a single standardized module. driver（S1） P represents the power required by the first driver. driver（S2） Indicates the power required by the second driver; The parallel power supply module system includes a first power supply subsystem and a second power supply subsystem; both the first and second power supply subsystems are composed of multiple standardized modules connected 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.

4. An adjustable power supply system for a driver in an IGCT-MMC flexible linear submodule, characterized in that, include: Current sampling processing module, power supply module parallel system and control system; The sampling current processing module is used to transmit the port current of the collected IGCT-MMC flexible straight submodule to the control system for data conversion, and to transmit the port current of the IGCT-MMC flexible straight submodule after data conversion to the control system. The control system includes: The first calculation module is used to obtain the IGCT device turn-off current based on the port current of the IGCT-MMC flexible straight submodule and the switching mode of the IGCT-MMC flexible straight submodule. The second calculation module is used to calculate the power required by the driver based on the functional relationship between the turn-off current of the IGCT device and the power required by the driver, as well as the switching mode of the IGCT-MMC flexible sub-module. The power configuration module is used to dynamically configure the number of standardized modules in the parallel power supply module system according to the power required by the driver; the parallel power supply module system is composed of multiple standardized modules connected in parallel, and each standardized module is redundant with the others. The parallel power supply module system is used to power the driver of the IGCT device; The IGCT device turn-off current is obtained by calculating the port current of the IGCT-MMC flexible straightener submodule and the switching mode of the IGCT-MMC flexible straightener submodule. The specific formula is as follows: In the formula, I off(S1) Indicates the turn-off current of the first IGCT device; I off(S2) Indicates the turn-off current of the second IGCT device; I b This represents the port current of the IGCT-MMC flexible DC module; S takes the value 0 or 1; it represents the switching mode of the IGCT-MMC flexible DC module, where S=1 when the switching mode of the IGCT-MMC flexible DC module is the input mode; and S=0 when the switching mode of the IGCT-MMC flexible DC module is the output mode. The calculation of the driver's required power supply based on the functional relationship between the IGCT device's turn-off current and the driver's required power supply, and the IGCT device's 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 power required by the driver. The power required by the driver is calculated using the following formula: In the formula, P driver（S1） Indicates the power required by the first driver; I off(S1) P represents the turn-off current of the first IGCT device; driver（S2） Indicates the power required by the second driver; I off(S2) This indicates the turn-off current of the second IGCT device; The functional relationship between the IGCT device turn-off current and the power required by the driver is obtained by fitting historical IGCT device turn-off current and historical driver power required.

5. The driver adjustable power supply system for an IGCT-MMC flexible straight submodule according to claim 4, characterized in that, The sampling current processing module is used to convert the port current system of the IGCT-MMC flexible straight submodule into data, and transmit the converted port current of the IGCT-MMC flexible straight submodule to the control system. The sampling current processing module is connected to a current acquisition device configured at the port of the IGCT-MMC flexible straight sub-module. The current acquisition device uses a Hall sensor or a Rogowski coil.

6. The driver adjustable power supply system for an IGCT-MMC flexible straight submodule according to claim 4, characterized in that, The switching mode of the IGCT-MMC flexible straightening submodule is transmitted to the control system by the IGCT-MMC flexible straightening submodule main control board.

7. The driver adjustable power supply system for an IGCT-MMC flexible straight submodule according to claim 4, characterized in that, 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, including: The method of dynamically configuring the number of standardized modules in the parallel power supply module system according to the power required by the driver includes: Based on the power required by the driver, the number of standardized modules in the parallel power supply module system is calculated. The specific calculation formula is as follows: In the formula, This indicates the number of standardized modules configured in the first power supply subsystem; This indicates the number of standardized modules configured in the second power supply subsystem; P represents the output power of a single standardized module. driver（S1） P represents the power required by the first driver. driver（S2） Indicates the power required by the second driver; The parallel power supply module system includes a first power supply subsystem and a second power supply subsystem; both the first and second power supply subsystems are composed of multiple standardized modules connected 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.

8. The driver adjustable power supply system for an IGCT-MMC flexible straight submodule according to claim 4, characterized in that, The parallel power supply module system includes at least two power supply subsystems; each power supply subsystem corresponds to the driver of an IGCT device; each power supply subsystem is composed of multiple standardized modules connected in parallel, and the standardized modules are redundant with each other; the power supply subsystems are redundant with each other.

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