Auxiliary energy taking test loop circuit for converter valve, control method and control device

Abstract

The invention provides an auxiliary energy taking test loop circuit for a converter valve, a control method and a control device, and relates to the technical field of high-voltage direct-current transmission converter valve test loops. The test loop circuit comprises a high-voltage loop, a first output end of the high-voltage loop is connected with a high-voltage end of the converter valve, a second output end of the high-voltage loop is connected with a low-voltage end of the converter valve, and the high-voltage loop is used for applying voltage to the converter valve; the first output end of the large-current loop is connected with the high-voltage end of the converter valve, the second output end of the large-current loop is connected with the low-voltage end of the converter valve, and the large-current loop is used for applying current to the converter valve; the high-voltage end of the auxiliary starting energy-taking loop is connected with the high-voltage end of the converter valve, the low-voltage end of the auxiliary starting energy-taking loop is connected with the low-voltage end of the converter valve, and the auxiliary starting energy-taking loop is used for being put into operation in the starting stage of the test loop circuit so as to provide stable energy-taking voltage for the converter valve and quitting operation after energy taking of the converter valve is finished. The problem that an existing synthesis loop cannot meet the requirement that a novel converter valve cannot be normally started is solved.

Description

Technical Field

[0001] The present application relates to the technical field of a high-voltage direct current transmission converter valve test circuit, and in particular to a test circuit circuit, a control method and a control device for auxiliary energy extraction of a converter valve. Background Art

[0002] According to relevant standards, the type test of thyristor converter valve components includes insulation test and operation test, among which the operation test is usually carried out using a synthetic test circuit. The converter valve synthetic test circuit is a test system used to study and test the performance of high-power thyristor converter valves in modern power systems. It is generally composed of multiple sub-units such as voltage source, current source, impulse voltage source, fault current source, isolation valve, auxiliary valve, etc. The synthetic test circuit requires the participation of the test valve when starting. For the converter valve with a traditional thyristor control unit that uses a ready-to-use energy supply method, the drive can take full energy and complete the normal triggering of the thyristor within one power frequency cycle of power-on, and the synthetic circuit can start smoothly.

[0003] However, this method is inconsistent with the actual operation on site, where the converter valve first withstands voltage for a period of time and then unlocks the operation, and cannot more realistically simulate the actual operation conditions on site. In addition, with the application requirements of intelligent and digital converter valves, digital drive converter valves have emerged. Due to the existence of internal digital chips, digital drives require a stable and reliable working power supply. The start-up of the drive requires a higher voltage and a longer energy acquisition time. The synthetic loop cannot complete the energy acquisition start of the digital drive within one power frequency cycle. On the other hand, in order to solve the problem of inverter-side commutation failure, the new type of reverse resistance IGCT converter valve has gradually become a research focus. The drive of IGCT devices requires greater power, and the drive operation requires higher voltage and longer energy acquisition time. The original synthetic loop cannot meet the test requirements of the new converter valve.

[0004] Therefore, it is necessary to propose a test circuit, control method and control device for auxiliary energy extraction of the converter valve to solve the problem that the current synthetic circuit cannot meet the problem that the new converter valve cannot start normally, and at the same time make the test conditions of the converter valve closer to the actual operating conditions. Summary of the invention

[0005] In order to solve at least one of the above problems, the present application proposes a test loop circuit, a control method and a control device for auxiliary energy extraction of a converter valve.

[0006] According to the first aspect of the present application, at least one embodiment of the present application provides a test loop circuit for auxiliary energy extraction of a converter valve, comprising: a high voltage loop, wherein a first output end of the high voltage loop is connected to a high voltage end of the converter valve, and a second output end is connected to a low voltage end of the converter valve, for applying voltage to the converter valve; a high current loop, wherein a first output end of the high current loop is connected to a high voltage end of the converter valve, and a second output end is connected to a low voltage end of the converter valve, for applying current to the converter valve; an auxiliary starting energy extraction loop, wherein a high voltage end of the auxiliary starting energy extraction loop is connected to a high voltage end of the converter valve, and a low voltage end is connected to a low voltage end of the converter valve, for being put into operation during the starting phase of the test loop circuit to provide a stable energy extraction voltage to the converter valve, and exiting operation after the converter valve has finished absorbing energy.

[0007] For example, in some embodiments of the present application, the auxiliary starting energy supply circuit includes: a current measuring unit, one end of which is connected to the high-voltage end of the converter valve; a starting valve, the anode end of which is connected to the other end of the current measuring unit; an isolating switch, one end of which is connected to the cathode end of the starting valve, and the other end is connected to the low-voltage end of the converter valve, for reducing the number of series-connected devices of the converter valve; a voltage measuring unit, one end of which is connected to the high-voltage end of the converter valve, and the other end is connected to the low-voltage end of the converter valve.

[0008] For example, in some embodiments of the present application, the starting valve is a first converter valve, which includes at least one thyristor, IGBT, IGCT, GTO, MOSFET, IEGT connected in series and / or in parallel.

[0009] For example, in some embodiments of the present application, the converter valve is an IGCT converter valve requiring pre-energy extraction and / or a digitally driven thyristor converter valve.

[0010] According to the second aspect of the present application, at least one embodiment of the present application provides a control method for a test loop circuit for auxiliary energy extraction of a converter valve, which is used to control the test loop circuit for auxiliary energy extraction of a converter valve as described in any one of the first aspects, including: setting the voltage output value of the high voltage loop and the current output value of the high current loop; executing the auxiliary energy extraction start-up process of the converter valve; judging whether the auxiliary energy extraction start-up process of the converter valve is completed; when the auxiliary energy extraction start-up process of the converter valve is completed, unlocking the high current loop, and controlling the triggering timing of the high voltage loop and the high current loop, so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

[0011] For example, in some embodiments of the present application, the execution of the auxiliary energy starting process of the converter valve includes: closing the isolating switch of the auxiliary starting energy taking circuit; unlocking the starting valves of the high voltage circuit and the auxiliary starting energy taking circuit, and locking the converter valve; detecting whether the voltage across the converter valve is greater than a preset converter valve starting voltage threshold value, and detecting whether the state feedback signal of the converter valve is normal; when the voltage across the converter valve is greater than the converter valve starting voltage threshold value and the state feedback signal of the converter valve is normal, unlocking the converter valve and locking the starting valve; detecting the branch current of the starting valve; and disconnecting the isolating switch when the branch current of the starting valve is less than the exit current threshold value of the auxiliary starting energy taking circuit.

[0012] For example, in some embodiments of the present application, determining whether the auxiliary energy extraction startup process of the converter valve is completed includes: detecting whether the status feedback signal of the converter valve is normal; determining whether the converter valve is unlocked; determining whether the start valve is locked; and determining whether the isolation switch is disconnected.

[0013] For example, in some embodiments of the present application, when the auxiliary energy extraction startup process of the converter valve is completed, the high current circuit is unlocked, and the trigger timing of the high voltage circuit and the high current circuit is controlled so that the voltage at both ends of the converter valve and the current passing through the converter valve reach the set target values, including: when the state feedback signal of the converter valve is normal, the converter valve is unlocked, the start valve is locked, and the isolation switch is disconnected, the high current circuit is unlocked, and the trigger timing of the high voltage circuit and the high current circuit is controlled so that the voltage at both ends of the converter valve and the current passing through the converter valve reach the set target values.

[0014] According to the third aspect of the present application, at least one embodiment of the present application provides a control device for a test loop circuit for auxiliary energy extraction of a converter valve, which is used to execute the control method for the test loop circuit for auxiliary energy extraction of a converter valve as described in any one of the second aspects, including: a voltage / current setting module, used to set the voltage output value of the high voltage loop and the current output value of the large current loop; an execution module, used to execute the auxiliary energy extraction start-up process of the converter valve; a judgment module, used to judge whether the auxiliary energy extraction start-up process of the converter valve is completed, and the execution module is also used to unlock the large current loop when the auxiliary energy extraction start-up process of the converter valve is completed, and control the trigger timing of the high voltage loop and the large current loop, so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

[0015] For example, in some embodiments of the present application, it also includes: a power supply module, which is used to provide power to the voltage / current setting module, the execution module and the judgment module.

[0016] Through the above-mentioned example embodiments, the present application provides a test loop circuit, control method and control device for auxiliary energy extraction of a converter valve. By connecting auxiliary starting energy extraction circuits in parallel on both sides of the converter valve, the problem that the current synthetic loop cannot meet the problem that the new converter valve cannot start normally is solved, and at the same time, the test working condition of the converter valve can be closer to the actual operating condition; and the isolating switch connected in series in the auxiliary starting energy extraction circuit can further reduce the withstand voltage value of the starting valve, reduce the number of series-connected starting valve devices, and save costs.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By describing in detail exemplary embodiments thereof with reference to the accompanying drawings, the above and other objects, features and advantages of the present application will become more apparent. The accompanying drawings described below are only some embodiments of the present application, and are not intended to limit the present application.

[0019] Figure 1 A circuit diagram of a test loop for auxiliary energy extraction of a converter valve according to an exemplary embodiment is shown;

[0020] Figure 2 A flow chart showing a control method of a test loop circuit for auxiliary energy extraction of a converter valve according to an exemplary embodiment;

[0021] Figure 3 A flow chart showing an auxiliary energy extraction start-up process for a converter valve according to an exemplary embodiment;

[0022] Figure 4 A timing diagram showing a control method of a test loop circuit for auxiliary energy extraction of a converter valve according to an exemplary embodiment;

[0023] Figure 5 A schematic diagram of a control device of a test loop circuit for auxiliary energy extraction of a converter valve according to an exemplary embodiment is shown. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0025] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices, etc. may be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0026] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0027] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0028] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0029] Figure 1 A circuit diagram of a test loop for auxiliary energy extraction of a converter valve according to an exemplary embodiment is shown.

[0030] like Figure 1 As shown, the test circuit for auxiliary energy extraction of the converter valve includes: a high voltage circuit 101, a high current circuit 102 and an auxiliary starting energy extraction circuit 103.

[0031] According to an exemplary embodiment, the converter valve 10 is an IGCT converter valve requiring pre-energy extraction and / or a digitally driven thyristor converter valve.

[0032] The first output end of the high voltage circuit 101 is connected to the high voltage end of the converter valve 10 , and the second output end is connected to the low voltage end of the converter valve 10 , so as to apply voltage to the converter valve 10 .

[0033] A first output end of the high current loop 102 is connected to a high voltage end of the converter valve 10 , and a second output end is connected to a low voltage end of the converter valve 10 , for applying current to the converter valve 10 .

[0034] The high-pressure end of the auxiliary startup energy-taking circuit 103 is connected to the high-pressure end of the converter valve 10, and the low-pressure end is connected to the low-pressure end of the converter valve 10, and is used to be put into operation during the startup phase of the test loop circuit to provide a stable energy-taking voltage to the converter valve 10. After the converter valve 10 finishes taking energy, the auxiliary startup energy-taking circuit 103 stops running.

[0035] According to an example embodiment, the auxiliary starting energy taking circuit 103 includes: a current measuring unit 1031 , a starting valve 1032 , an isolating switch 1033 , and a voltage measuring unit 1034 .

[0036] Among them, one end of the current measuring unit 1031 is connected to the high-voltage end of the converter valve 10. The anode end of the start valve 1032 is connected to the other end of the current measuring unit 1031. One end of the isolating switch 1033 is connected to the cathode end of the start valve 1032, and the other end is connected to the low-voltage end of the converter valve 10, which is used to reduce the number of series-connected devices of the converter valve 10. One end of the voltage measuring unit 1034 is connected to the high-voltage end of the converter valve 10, and the other end is connected to the low-voltage end of the converter valve 10.

[0037] According to some embodiments, the start valve 1032 is a first converter valve, including at least one thyristor, IGBT, IGCT, GTO, MOSFET, IEGT connected in series and / or in parallel.

[0038] Through the above-mentioned example embodiments, the present application provides a test circuit for auxiliary energy extraction of a converter valve. By connecting auxiliary starting energy extraction circuits in parallel on both sides of the converter valve, the problem that the current synthetic circuit cannot meet the problem that the new converter valve cannot start normally is solved, and at the same time, the test working condition of the converter valve can be closer to the actual operating condition; and the isolating switch connected in series in the auxiliary starting energy extraction circuit can further reduce the withstand voltage value of the starting valve, reduce the number of series-connected starting valve devices, and save costs.

[0039] Figure 2 A flow chart of a control method of a test loop circuit for auxiliary energy extraction of a converter valve according to an exemplary embodiment is shown.

[0040] like Figure 2 As shown, the control method of the test loop circuit for auxiliary energy extraction of the converter valve includes steps S201-S204.

[0041] In step S201 , the voltage output value of the high voltage circuit and the current output value of the high current circuit are set.

[0042] In step S202, the auxiliary energy-taking start-up process of the converter valve is executed.

[0043] like Figure 3 As shown, the auxiliary energy extraction startup process for the converter valve includes steps S2021-S2026.

[0044] In step S2021, close the isolating switch of the auxiliary starting energy taking circuit.

[0045] In step S2022, the starting valves of the high voltage circuit and the auxiliary starting energy taking circuit are unlocked, and the converter valve is locked.

[0046] In step S2023, it is detected whether the voltage across the converter valve is greater than a preset converter valve starting voltage threshold value, and it is detected whether the state feedback signal of the converter valve is normal.

[0047] In step S2024, when the voltage across the converter valve is greater than the converter valve starting voltage threshold value and the status feedback signal of the converter valve is normal, the converter valve is unlocked and the starting valve is locked.

[0048] In step S2025, the branch current of the starting valve is detected.

[0049] In step S2026, when the branch current of the starting valve is less than the exit current threshold value of the auxiliary starting energy taking circuit, the isolating switch is disconnected.

[0050] In step S203, it is determined whether the auxiliary energy-taking start-up process of the converter valve is completed.

[0051] According to an example embodiment, determining whether the auxiliary energy extraction startup process of the converter valve is completed includes: detecting whether the state feedback signal of the converter valve is normal, determining whether the converter valve is unlocked, determining whether the start valve is locked, and determining whether the isolation switch is disconnected.

[0052] In step S204, when the auxiliary energy starting process of the converter valve is completed, the high current loop is unlocked, and the triggering timing of the high voltage loop and the high current loop is controlled so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

[0053] According to an example embodiment, when the status feedback signal of the converter valve is normal, the converter valve is unlocked, the start valve is locked, and the isolation switch is disconnected, the high current loop is unlocked and the triggering timing of the high voltage loop and the high current loop is controlled so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

[0054] Figure 4 A timing diagram of a control method of a test loop circuit for auxiliary energy extraction of a converter valve according to an exemplary embodiment is shown.

[0055] See also Figure 4 At t0, the isolating switch of the auxiliary energy-taking starting circuit is closed; at t1, the starting valves of the high-voltage circuit and the auxiliary energy-taking starting circuit are unlocked. At this time, the converter valve and the large current circuit are in a closed state, the voltage at both ends of the converter valve rises slowly, and the small current of the large current circuit flows through the starting valve; at t2, the voltage at both ends of the converter valve is greater than the starting voltage threshold of the converter valve, such as 10kV, the converter valve is unlocked, the starting valve is locked, and the small current of the large current circuit is transferred to the test valve; at t3, when the converter valve branch current is less than the exit current threshold value of the auxiliary starting energy-taking circuit, such as 100A, the isolating switch of the auxiliary starting energy-taking circuit is separated; at t4, the large current circuit is unlocked, and the current of the large current circuit and the small current of the high voltage circuit flow through the test valve together; at t5, the triggering timing of the high voltage circuit and the large current circuit is controlled so that the voltage at both ends of the test valve and the current passing through the test valve reach the set target value.

[0056] Figure 5 A schematic diagram of a control device of a test loop circuit for auxiliary energy extraction of a converter valve according to an exemplary embodiment is shown.

[0057] like Figure 5 As shown, the control device of the test circuit circuit for auxiliary energy extraction of the converter valve is used to execute the control method of the test circuit circuit for auxiliary energy extraction of the converter valve as described above. The control device of the test circuit circuit for auxiliary energy extraction of the converter valve includes: a voltage / current setting module 501, an execution module 502 and a judgment module 503.

[0058] The voltage / current setting module 501 is used to set the voltage output value of the high voltage loop and the current output value of the high current loop.

[0059] The execution module 502 is used to execute the auxiliary energy-taking start-up process of the converter valve, including: closing the isolating switch of the auxiliary starting energy-taking circuit; unlocking the starting valves of the high voltage circuit and the auxiliary starting energy-taking circuit, and locking the converter valve; detecting whether the voltage across the converter valve is greater than the converter valve starting voltage threshold value, and detecting whether the status feedback signal of the converter valve is normal; when the voltage across the converter valve is greater than the preset converter valve starting voltage threshold value and the status feedback signal of the converter valve is normal, unlocking the converter valve and locking the starting valve; detecting the branch current of the starting valve; and disconnecting the isolating switch when the branch current of the starting valve is less than the exit current threshold value of the auxiliary starting energy-taking circuit.

[0060] The judgment module 503 is used to judge whether the auxiliary energy-taking start-up process of the converter valve is completed, including: detecting whether the state feedback signal of the converter valve is normal, judging whether the converter valve is unlocked, judging whether the start-up valve is locked, and judging whether the isolating switch is disconnected.

[0061] The execution module 502 is also used to unlock the high current loop and control the triggering timing of the high voltage loop and the high current loop when the auxiliary energy extraction start-up process of the converter valve is completed, so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

[0062] According to some embodiments, the control device further includes a power supply module 504 .

[0063] The power supply module 504 is used to provide power to the voltage / current setting module 501 , the execution module 502 and the determination module 503 .

[0064] It should be clearly understood that the present application describes how to form and use specific examples, but the present application is not limited to any details of these examples. On the contrary, based on the teaching of the content disclosed in the present application, these principles can be applied to many other embodiments.

[0065] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0066] The exemplary embodiments of the present application are specifically shown and described above. It should be understood that the present application is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present application is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A test circuit for auxiliary energy extraction of a converter valve, characterized in that: include: A high voltage circuit, wherein a first output end of the high voltage circuit is connected to a high voltage end of the converter valve, and a second output end is connected to a low voltage end of the converter valve, for applying a voltage to the converter valve; A large current loop, wherein a first output end of the large current loop is connected to a high voltage end of the converter valve, and a second output end is connected to a low voltage end of the converter valve, and is used to apply current to the converter valve; An auxiliary starting energy-taking circuit, wherein the high-pressure end of the auxiliary starting energy-taking circuit is connected to the high-pressure end of the converter valve, and the low-pressure end is connected to the low-pressure end of the converter valve, and is used to be put into operation during the startup phase of the test loop circuit to provide a stable energy-taking voltage to the converter valve, and to exit operation after the converter valve has finished absorbing energy.

2. The test loop circuit according to claim 1, characterized in that The auxiliary starting energy taking circuit comprises: A current measuring unit, one end of which is connected to the high-voltage end of the converter valve; A starting valve, wherein the anode end of the starting valve is connected to the other end of the current measuring unit; An isolating switch, one end of which is connected to the cathode end of the starting valve, and the other end of which is connected to the low-pressure end of the converter valve, for reducing the number of series-connected devices of the converter valve; A voltage measuring unit, one end of which is connected to the high-pressure end of the converter valve, and the other end of which is connected to the low-pressure end of the converter valve.

3. The test loop circuit according to claim 2, characterized in that The starting valve is a first converter valve, which includes at least one thyristor, IGBT, IGCT, GTO, MOSFET, IEGT connected in series and / or in parallel.

4. The test loop circuit according to any one of claims 1 to 3, characterized in that: The converter valve is an IGCT converter valve requiring pre-energy extraction and / or a digitally driven thyristor converter valve.

5. A control method for a test circuit circuit for auxiliary energy extraction of a converter valve, characterized in that: A test loop circuit for controlling auxiliary energy extraction for a converter valve according to any one of claims 1 to 4, comprising: Setting the voltage output value of the high voltage loop and the current output value of the high current loop; Execute the auxiliary energy taking start-up process of the converter valve; Determining whether the auxiliary energy taking start-up process of the converter valve is completed; When the auxiliary energy-taking start-up process of the converter valve is completed, the high-current circuit is unlocked, and the triggering timing of the high-voltage circuit and the high-current circuit is controlled so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

6. The control method according to claim 5, characterized in that: The auxiliary energy taking start-up process of executing the converter valve includes: Closing the isolating switch of the auxiliary starting energy taking circuit; Unlocking the starting valves of the high voltage circuit and the auxiliary starting energy taking circuit, and locking the converter valve; Detecting whether the voltage across the converter valve is greater than a preset converter valve start voltage threshold value, and detecting whether the state feedback signal of the converter valve is normal; When the voltage across the converter valve is greater than the converter valve start voltage threshold value and the state feedback signal of the converter valve is normal, unlocking the converter valve and locking the start valve; Detecting the branch current of the starting valve; When the branch current of the starting valve is less than the exit current threshold value of the auxiliary starting energy taking circuit, the isolating switch is disconnected.

7. The control method according to claim 5, characterized in that: The step of judging whether the auxiliary energy taking start-up process of the converter valve is completed includes: Detecting whether the state feedback signal of the converter valve is normal; Determining whether the converter valve is unlocked; Determining whether the start valve is locked; Determine whether the isolating switch is disconnected.

8. The control method according to claim 5, characterized in that: When the auxiliary energy-taking start-up process of the converter valve is completed, unlocking the high-current circuit, and controlling the triggering timing of the high-voltage circuit and the high-current circuit, so that the voltage across the converter valve and the current passing through the converter valve reach set target values, includes: When the state feedback signal of the converter valve is normal, the converter valve is unlocked, the start valve is locked, and the isolating switch is disconnected, the high current circuit is unlocked and the triggering timing of the high voltage circuit and the high current circuit is controlled so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

9. A control device for a test circuit circuit for auxiliary energy extraction of a converter valve, characterized in that: A control method for executing a test loop circuit for auxiliary energy extraction of a converter valve according to any one of claims 5 to 8, comprising: A voltage / current setting module, used to set the voltage output value of the high voltage loop and the current output value of the high current loop; An execution module, used for executing the auxiliary energy taking start-up process of the converter valve; The judgment module is used to judge whether the auxiliary energy-taking startup process of the converter valve is completed. The execution module is also used to unlock the high-current circuit and control the triggering timing of the high-voltage circuit and the high-current circuit when the auxiliary energy-taking startup process of the converter valve is completed, so that the voltage across the converter valve and the current passing through the converter valve reach the set target values.

10. The control device according to claim 9, characterized in that Also includes: A power supply module is used to provide power to the voltage / current setting module, the execution module and the judgment module.

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