Control actuator and method for Tokamak plasma vertical instability

Abstract

The invention discloses a control actuator and method for Tokamak plasma vertical instability, the control actuator comprises at least two groups of control structures, and each group of control structure comprises a vacuum switch, a voltage-regulating three-winding transformer, a rectifier, an H-bridge module and a load; a first H-bridge module and a second H-bridge module in the H-bridge modules are connected in series to form a series module, and the H-bridge modules in each group of control structures are connected in parallel and then connected with a load; the control actuator obtains external trigger information through an H-bridge module, and when plasma vertical displacement control needs to be enhanced, a first secondary side of a voltage-regulating three-winding transformer is connected to a high-voltage winding to provide high-voltage output for plasma control; when low-parameter plasma discharge debugging is matched, the second secondary side of the voltage-regulating three-winding transformer is connected to the low-voltage winding, and safe low-voltage output is provided for plasma control. According to the invention, the problems of slow response speed, limited ripple control capability and the like in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the field of plasma control technology, and in particular to a control actuator and method for vertical instability of tokamak plasma. Background Art

[0002] Stable plasma discharge is not only an indispensable prerequisite for conducting high-quality physical experiments, but also the key to promoting the development of cutting-edge fields such as fusion energy research. Therefore, as an important basis for ensuring the smooth progress of experiments, the importance of plasma control technology is self-evident. The elongated plasma configuration is considered to be one of the effective ways to obtain higher plasma currents because it can more effectively confine plasma and promote the increase of current. However, this elongated plasma shape is inherently unstable. In the absence of effective control, the vertical deviation of the plasma will rapidly increase, which will not only affect the accuracy of the experimental results, but may also pose a serious threat to the structural safety of the experimental device.

[0003] Traditional control methods, such as thyristor converters, are widely used in nuclear fusion tokamaks to generate strong magnetic fields in an attempt to maintain plasma stability. Although they meet the requirements of steady-state operation to a certain extent, their slow response speed and limited ripple control capabilities make it difficult to adapt to the control requirements of rapid changes in plasma vertical instability. In the application environment of large plasma current and large elongation ratio, the problem of vertical instability will become more and more obvious, and the existing technology has the problems of slow response speed and limited ripple control capability, and the accuracy and stability of the control system are not high.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The present invention aims to provide a control actuator and method for vertical instability of tokamak plasma, which can quickly respond to the vertical displacement of plasma, provide a large reverse voltage when the plasma is vertically unstable, avoid the large rupture caused by the disappearance of plasma hitting the wall to a large extent, and protect the safe operation of the tokamak device. The present invention uses advanced power electronic devices and precise control methods to achieve rapid and accurate control of the instability of elongated plasma in the vertical direction. It not only solves the problems of slow response speed and limited ripple control ability in the prior art, but also improves the accuracy and stability of the control system. At the same time, the modular structure can flexibly change the output voltage and current to adapt to different loads or different plasma control requirements. In addition, the actual output voltage frequency can be changed according to the phase shift control delay between modules. For occasions with high voltage change rate requirements, the voltage can be changed quickly by not shifting the phase. For occasions with high voltage flat-top frequency requirements, the voltage frequency can be increased by shifting the phase.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a control actuator for vertical instability of a tokamak plasma, the control actuator comprising at least two groups of control structures, each group of control structures comprising a vacuum switch, a voltage-regulating three-winding transformer, a rectifier, an H-bridge module and a load; the rectifier comprises a first rectifier and a second rectifier, and the H-bridge module comprises a first H-bridge module and a second H-bridge module;

[0008] One end of the vacuum switch is connected to the alternating current AC, and the other end is connected to the primary side of the voltage-regulating three-winding transformer. The first secondary side of the voltage-regulating three-winding transformer is connected to the first rectifier, and the first rectifier is connected to the first H-bridge module. The second secondary side of the voltage-regulating three-winding transformer is connected to the second rectifier and the second H-bridge module.

[0009] The first H-bridge module and the second H-bridge module in the H-bridge module are connected in series to form a series module, and the H-bridge modules in each group of control structures are connected in parallel and then connected to the load, so as to provide high voltage and high current to the load at the same time;

[0010] The control actuator obtains external trigger information through the H-bridge module. When it is necessary to strengthen the vertical displacement control of the plasma, the first secondary side of the voltage-regulating three-winding transformer is connected to the high-voltage winding to provide high-voltage output for plasma control. When cooperating with low-parameter plasma discharge debugging, the second secondary side of the voltage-regulating three-winding transformer is connected to the low-voltage winding to provide safe low-voltage output for plasma control.

[0011] Furthermore, each control structure group also includes a first voltage stabilizing capacitor and a second voltage stabilizing capacitor;

[0012] The first voltage-stabilizing capacitor is connected in parallel to both ends of the output of the first rectifier, and the second voltage-stabilizing capacitor is connected in parallel to both ends of the output of the second rectifier.

[0013] Furthermore, each group of control structures also includes a current sharing inductor, and the current sharing inductor includes a first current sharing inductor and a second current sharing inductor;

[0014] A first current-sharing inductor is connected in series to the output side of the first H-bridge module, and a second current-sharing inductor is connected in series to the output side of the second H-bridge module.

[0015] Furthermore, the H-bridge module adopts an IGBT-based full-bridge inverter bridge for converting DC voltage into AC voltage, and based on the fast switching characteristics of IGBT, a higher frequency output voltage can be provided.

[0016] Furthermore, the rectifier adopts a diode uncontrolled rectifier, which is used to convert the AC output of the voltage regulating three-winding transformer into DC and then provide a DC voltage to the H-bridge module.

[0017] Furthermore, the control actuator flexibly changes the output parameters by adjusting the number and mode of series and parallel connections in each group of control structures.

[0018] In a second aspect, the present invention further provides a method for controlling vertical instability of plasma in a tokamak, the control method comprising:

[0019] When the plasma control speed and accuracy in the tokamak device change, high voltage output or low voltage output is achieved by adjusting the number and mode of series and parallel connections in each group of control structures according to the external trigger information obtained from the H-bridge module; adjusting the number and mode of series and parallel connections in each group of control structures includes: increasing the number of series modules and / or changing the connection mode of the series modules;

[0020] A displacement sensor for measuring the vertical displacement of plasma is arranged in the vacuum chamber of the tokamak device. When the displacement sensor detects that the vertical displacement is offset from the center point, the external control system sends a command for reverse voltage output to the H-bridge module and generates a magnetic field in the opposite direction of the vertical displacement of the plasma inside the vacuum chamber to correct the vertical displacement of the plasma.

[0021] Further, the high voltage output or the low voltage output includes:

[0022] When it is necessary to strengthen the vertical displacement control of the plasma, the first secondary side of the voltage regulating three-winding transformer is connected to the high voltage winding to provide a high voltage output for plasma control;

[0023] When cooperating with low-parameter plasma discharge debugging, the second secondary side of the voltage-regulating three-winding transformer is connected to the low-voltage winding to provide a safe low-voltage output for plasma control.

[0024] Furthermore, the control method further includes:

[0025] When the vertical displacement of the plasma in the tokamak device is greater than the preset threshold (i.e., when rapid control is required), the trigger pulses of the IGBTs in each H-bridge module are set to output in the same phase, i.e., each H-bridge module is turned on or off at the same time, and the fastest response speed can reach 200μs;

[0026] When the vertical displacement offset of the plasma in the tokamak device is less than or equal to the preset threshold (that is, when low ripple output is required), the trigger pulse of the IGBT in each H-bridge module is set to a staggered phase output, that is, the first H-bridge module and the second H-bridge module inside the series module are phase-shifted by 100μs, and the two series modules are phase-shifted by 50μs, so as to achieve low ripple output and make plasma control smoother.

[0027] Furthermore, the preset threshold is related to the volume of the tokamak device and the plasma.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] 1. The present invention is a control actuator and method for vertical instability of tokamak plasma. The present invention uses advanced power electronic devices and precise control methods to achieve rapid and accurate control of the instability of elongated plasma in the vertical direction. It not only solves the problems of slow response speed and limited ripple control ability in the prior art, but also improves the accuracy and stability of the control system. At the same time, the modular structure can flexibly change the output voltage and current to adapt to different loads or different plasma control requirements. In addition, the actual output voltage frequency can be changed according to the phase shift control delay between modules. For occasions with high voltage change rate requirements, the voltage can be changed quickly by not shifting the phase. For occasions with high voltage flat-top frequency requirements, the voltage frequency can be increased by shifting the phase.

[0030] 2. The present invention can output large voltage and large current simultaneously and provide a response speed of 200 μs.

[0031] 3. The present invention can effectively control the vertical displacement of plasma within 1 cm.

[0032] 4. The present invention can ensure both the vertical displacement control of plasma and economic efficiency, and has a strong cost-effectiveness.

[0033] 5. The front stage of the present invention adopts a 12-pulse uncontrolled rectifier, which can reduce ripples and harmonics, provide a stable DC input for the back stage, and ensure the quality of power output.

[0034] 6. The present invention adopts a full-bridge inverter circuit structure, which can realize positive and negative voltage and current output. It adopts IGBT high-frequency switching devices, which can greatly improve the positive and negative voltage switching speed to meet the requirements of high voltage positive and negative switching for plasma vertical instability control.

[0035] 7. The present invention adopts multiple modules in series, and can increase or decrease modules according to different load requirements, change the output frequency, and has expandability.

[0036] 8. The present invention can change the output voltage level, response speed, and ripple size according to the control requirements of the plasma and the debugging requirements in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of the control actuator for vertical instability of Tokamak plasma used in the present invention.

[0039] Reference numerals and corresponding component names:

[0040] 1-vacuum switch, 2-voltage regulating three-winding transformer, 31-first rectifier, 32-first rectifier, 41-first voltage stabilizing capacitor, 42-second voltage stabilizing capacitor, 51-first H-bridge module, 52-first H-bridge module, 6-series module, 71-first current sharing inductor, 72-second current sharing inductor, 8-load. DETAILED DESCRIPTION

[0041] Hereinafter, the term "include" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present invention, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0042] In various embodiments of the present invention, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0043] The expressions (such as "first", "second", etc.) used in various embodiments of the present invention may modify the various constituent elements in various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing an element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0044] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0045] The terms used in various embodiments of the present invention are only used for the purpose of describing specific embodiments and are not intended to limit various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meaning generally understood by those of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in various embodiments of the present invention.

[0046] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0047] In the application environment of large plasma current and large elongation ratio, the problem of vertical instability will become more and more obvious, and thus the high speed and effectiveness of its control actuator will be more stringent. This requires the control system to be able to quickly and accurately adjust the plasma position in a very short time and provide sufficient voltage changes to actively control its vertical displacement.

[0048] Therefore, the present invention designs a control actuator and method for vertical instability of tokamak plasma. The DC / AC-AC / DC variation structure includes a voltage-regulating three-winding transformer, a rectifier, an H-bridge module, etc., and can flexibly change the output parameters by modifying the number and mode of series-parallel connection. In particular, this structure is applied to the field of plasma control. By cleverly designing the number and mode of series-parallel connection of transformers, rectifiers and H-bridge modules, and by changing its control method, the output frequency can be changed, and it can be adapted to a variety of applications. The present invention can flexibly adjust the key parameters such as the amplitude, frequency and phase of the output voltage and current. This flexibility enables the structure to adapt to the needs of plasma physics experiments of different scales and types, ensuring the accuracy and safety of the experimental results.

[0049] The present invention can be widely applied to other Tokamak devices, and can also be transformed into an actuator for coils with other functions (such as position control coils, longitudinal field coils, etc.) in the Tokamak device.

[0050] Example 1

[0051] like Figure 1 As shown, the present invention is a control actuator for controlling vertical instability of Tokamak plasma, and the control actuator includes at least two groups of control structures. In this embodiment, the control actuator includes two groups of control structures.

[0052] Each control structure includes a vacuum switch 1, a voltage regulating three-winding transformer 2, a rectifier, a voltage stabilizing capacitor, an H-bridge module, a current sharing inductor and a load 8; the rectifier includes a first rectifier 31 and a second rectifier 32, the voltage stabilizing capacitor includes a first voltage stabilizing capacitor 41 and a second voltage stabilizing capacitor 42, the H-bridge module includes a first H-bridge module 51 and a second H-bridge module 52, and the current sharing inductor includes a first current sharing inductor 71 and a second current sharing inductor 72;

[0053] One end of the vacuum switch 1 is connected to the alternating current AC, and the other end is connected to the primary side of the voltage-regulating three-winding transformer 2. The first secondary side of the voltage-regulating three-winding transformer 2 is connected to the first rectifier 31, and the first rectifier 31 is connected to the first H-bridge module 51; the second secondary side of the voltage-regulating three-winding transformer 2 is connected to the second rectifier 32 and the second H-bridge module 52; the first voltage-stabilizing capacitor 41 is connected in parallel to the output ends of the first rectifier 31, and the second voltage-stabilizing capacitor 42 is connected in parallel to the output ends of the second rectifier 32; the output side of the first H-bridge module 51 is connected in series with the first current-sharing inductor 71, and the output side of the second H-bridge module 52 is connected in series with the second current-sharing inductor 72;

[0054] Wherein: the secondary side of the voltage regulating three-winding transformer 2 can be voltage regulated, and its output voltage is adjusted according to the needs of the back-end users, and is divided into two gears, namely the first secondary side and the second secondary side;

[0055] The rectifier 3 is a three-phase diode uncontrolled rectifier, which is used to convert the AC output of the voltage regulating three-winding transformer 2 into DC, and then provide a stable DC voltage to the H-bridge module after voltage stabilization by a voltage stabilizing capacitor;

[0056] The H-bridge module uses an IGBT-based full-bridge inverter bridge to convert DC voltage into AC voltage. At the same time, based on the fast switching characteristics of IGBT, it can provide a higher frequency output voltage.

[0057] The first H-bridge module 51 and the second H-bridge module 52 in the H-bridge module are first connected in series to form a series module 6, and the H-bridge modules in the two control structures are then connected in parallel and then connected to the load 8, so as to provide high voltage and high current to the load 8 at the same time;

[0058] In the above technical scheme, the control actuator of the present invention obtains external trigger information through the H-bridge module. (1) When it is necessary to strengthen the vertical displacement control of the plasma, the first secondary side of the voltage-regulating three-winding transformer 2 is connected to the high-voltage winding to provide a high-voltage output for the plasma control; (2) When coordinating with the low-parameter plasma discharge debugging, the second secondary side of the voltage-regulating three-winding transformer 2 is connected to the low-voltage winding to provide a safe low-voltage output for the plasma control; in order to ensure the output current sharing effect and low ripple at the back end, the secondary side of the three-winding transformer adopts star connection and delta connection.

[0059] The present invention can output high voltage and high current at the same time, and provide a response speed of 200μs. The control actuator of the present invention adopts a 12-pulse uncontrolled rectifier in the front stage, which can reduce ripple and harmonics, provide stable DC input for the back stage, and ensure the quality of power output; the full-bridge inverter circuit structure is adopted to realize positive and negative voltage and current output, and the IGBT high-frequency switching device is adopted to greatly improve the positive and negative voltage switching speed to meet the requirements of high voltage positive and negative switching of plasma vertical instability control. The control actuator of the present invention flexibly changes the output parameters by adjusting the number and method of series and parallel connections in each group of control structures. Among them, multiple modules are connected in series, and modules can be added or reduced according to different load requirements, and the output frequency can be changed, which is expandable.

[0060] Example 2

[0061] The difference between this embodiment and embodiment 1 is that this embodiment provides a control method for vertical instability of plasma in a tokamak, and the control method is based on the control actuator for vertical instability of plasma in a tokamak in embodiment 1; the control method includes:

[0062] Application scenario 1: When the plasma control speed and accuracy in the tokamak device change, high voltage output or low voltage output is achieved by adjusting the number and method of series and parallel connections in each group of control structures according to the external trigger information obtained from the H-bridge module; for example, increasing the number of series modules 6, changing the connection method of the series modules 6, increasing the number of components, etc.

[0063] Specifically, high voltage output or low voltage output is achieved through hardware changes, including:

[0064] When it is necessary to strengthen the vertical displacement control of the plasma, the first secondary side of the voltage regulating three-winding transformer 2 is connected to the high-voltage winding to provide a high voltage output for plasma control;

[0065] When cooperating with low-parameter plasma discharge debugging, the second secondary side of the voltage-regulating three-winding transformer 2 is connected to the low-voltage winding to provide a safe low-voltage output for plasma control.

[0066] Application scenario 2: When the vertical displacement of the plasma in the tokamak device is greater than the preset threshold, that is, when rapid control is required, the trigger pulses of the IGBTs in the two H-bridge modules are set to output in the same phase, that is, the two H-bridge modules are turned on or off at the same time, and the fastest response speed can reach 200μs; wherein the preset threshold is related to the volume of the tokamak device and the plasma, for example, the preset threshold can be 50mm;

[0067] Application scenario 3: When the vertical displacement offset of the plasma in the tokamak device is less than or equal to the preset threshold, that is, when low ripple output is required, the trigger pulses of the IGBTs in the two H-bridge modules are set to staggered output, that is, the first H-bridge module 51 and the second H-bridge module 52 inside the series module 6 are phase-shifted by 100μs, and the two series modules 6 are phase-shifted by 50μs, so as to achieve low ripple output and make plasma control smoother.

[0068] In view of the above different application scenarios, a displacement sensor for measuring the vertical displacement of the plasma is arranged in the vacuum chamber of the tokamak device. When the displacement sensor detects that the vertical displacement is offset from the center point, the external control system sends a command for reverse voltage output to the H-bridge module and generates a magnetic field in the opposite direction of the vertical displacement of the plasma inside the vacuum chamber to correct the vertical displacement of the plasma.

[0069] The present invention can output high voltage and high current at the same time and provide a response speed of 200 μs; the present invention can effectively control the vertical displacement offset of plasma within 1 cm; the present invention can ensure both the vertical displacement control of plasma and economic efficiency, and has a strong cost-effectiveness; the present invention can also change the output voltage level, response speed, and ripple size according to the control requirements of plasma and the debugging requirements in different scenarios.

[0070] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control actuator for vertical instability of tokamak plasma, characterized in that: The control actuator comprises at least two groups of control structures, each group of control structures comprises a vacuum switch (1), a voltage regulating three-winding transformer (2), a rectifier, an H-bridge module and a load (8); the rectifier comprises a first rectifier (31) and a second rectifier (32), and the H-bridge module comprises a first H-bridge module (51) and a second H-bridge module (52); One end of the vacuum switch (1) is connected to an alternating current, and the other end is connected to the primary side of a voltage-regulating three-winding transformer (2); the first secondary side of the voltage-regulating three-winding transformer (2) is connected to a first rectifier (31), and the first rectifier (31) is connected to a first H-bridge module (51); the second secondary side of the voltage-regulating three-winding transformer (2) is connected to a second rectifier (32) and a second H-bridge module (52); The first H-bridge module (51) and the second H-bridge module (52) are connected in series to form a series module (6), and the H-bridge modules in each group of control structures are connected in parallel and then connected to a load (8); The control actuator obtains external trigger information through an H-bridge module, and when it is necessary to strengthen the vertical displacement control of the plasma, the first secondary side of the voltage-regulating three-winding transformer (2) is connected to the high-voltage winding to provide a high-voltage output for plasma control; when coordinating low-parameter plasma discharge debugging, the second secondary side of the voltage-regulating three-winding transformer (2) is connected to the low-voltage winding to provide a safe low-voltage output for plasma control.

2. The control actuator for vertical instability of Tokamak plasma according to claim 1, characterized in that: Each group of control structures also includes a first voltage stabilizing capacitor (41) and a second voltage stabilizing capacitor (42); The first voltage-stabilizing capacitor (41) is connected in parallel to both ends of the output of the first rectifier (31), and the second voltage-stabilizing capacitor (42) is connected in parallel to both ends of the output of the second rectifier (32).

3. The control actuator for vertical instability of Tokamak plasma according to claim 1 or 2, characterized in that: Each group of control structures also includes a current sharing inductor, wherein the current sharing inductor includes a first current sharing inductor (71) and a second current sharing inductor (72); A first current-sharing inductor (71) is connected in series to the output side of the first H-bridge module (51), and a second current-sharing inductor (72) is connected in series to the output side of the second H-bridge module (52).

4. The control actuator for vertical instability of Tokamak plasma according to claim 1, characterized in that: The H-bridge module adopts an IGBT-based full-bridge inverter bridge to convert a DC voltage into an AC voltage and provide a high-frequency output voltage based on the on-off characteristics of the IGBT.

5. The control actuator for vertical instability of Tokamak plasma according to claim 1, characterized in that: The rectifier (3) is a diode uncontrolled rectifier, which is used to convert the alternating current output by the voltage regulating three-winding transformer (2) into direct current, and then provide a direct current voltage to the H-bridge module.

6. The control actuator for vertical instability of Tokamak plasma according to claim 1, characterized in that: The control actuator changes the output parameters by adjusting the number and mode of series and parallel connections in each group of control structures.

7. The control method for controlling an actuator for controlling vertical instability of a Tokamak plasma according to any one of claims 1 to 6, characterized in that: The control method includes: When the plasma control speed and accuracy in the tokamak device change, high voltage output or low voltage output is achieved by adjusting the number and mode of series and parallel connections in each group of control structures according to external trigger information obtained from the H-bridge module; the adjusting the number and mode of series and parallel connections in each group of control structures includes: increasing the number of series modules (6), and / or changing the connection mode of the series modules (6); A displacement sensor for measuring the vertical displacement of plasma is arranged inside the tokamak device. When the displacement sensor detects that the vertical displacement is offset from the center point, the external control system sends a command for reverse voltage output to the H-bridge module and generates a magnetic field inside the vacuum chamber in the opposite direction to the vertical displacement of the plasma to correct the vertical displacement of the plasma.

8. The control method according to claim 7, characterized in that: The high voltage output or low voltage output includes: When it is necessary to strengthen the vertical displacement control of the plasma, the first secondary side of the voltage regulating three-winding transformer (2) is connected to the high-voltage winding to provide a high voltage output for plasma control; When cooperating with low-parameter plasma discharge debugging, the second secondary side of the voltage-regulating three-winding transformer (2) is connected to the low-voltage winding to provide a safe low-voltage output for plasma control.

9. The control method according to claim 7, characterized in that: The control method also includes: When the vertical displacement of the plasma in the tokamak device is greater than the preset threshold, the trigger pulses of the IGBTs in each H-bridge module are set to output in the same phase, that is, each H-bridge module is turned on or off at the same time, with the fastest response speed reaching 200μs; When the vertical displacement offset of the plasma in the tokamak device is less than or equal to a preset threshold, the trigger pulse of the IGBT in each H-bridge module is set to be phase-shifted output, that is, the first H-bridge module (51) and the second H-bridge module (52) inside the series module (6) are phase-shifted by 100 μs, and the two series modules (6) are phase-shifted by 50 μs, thereby achieving low ripple output and making plasma control smoother.

10. The control method according to claim 9, characterized in that: The preset threshold is related to the volume of the tokamak device and the plasma.

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