Multi-IGBT parallel overvoltage protection method, device and system, storage medium and program product

Abstract

The invention relates to the technical field of computers, in particular to a multi-IGBT parallel overvoltage protection method, device and system, a storage medium and a program product. The method comprises the following steps: acquiring main circuit voltages corresponding to a plurality of IGBTs connected in parallel; if the voltage of the main circuit is greater than the first voltage threshold value, reducing the switching frequency of a driving signal adopted for driving the IGBT; if the voltage of the main circuit is larger than a second voltage threshold value, the working current corresponding to the IGBT is reduced, and the second voltage threshold value is larger than the first voltage threshold value; if the voltage of the main circuit is larger than a third voltage threshold value, the IGBT is controlled to be in a conducting state, and the third voltage threshold value is larger than the second voltage threshold value. According to the scheme, suppression and feedback protection can be achieved when multiple IGBTs are connected in parallel and overvoltage occurs.

Description

Technical Field

[0001] The present disclosure relates to the field of computer technology, and in particular to a method, device, system, storage medium and program product for overvoltage protection of multiple IGBTs in parallel. Background Art

[0002] Insulate-Gate Bipolar Transistor (IGBT) combines the advantages of Giant Transistor (GTR) and Power MOSFET, has good characteristics, and is widely used. However, in the prior art, when driving multiple IGBTs connected in parallel, the overvoltage suppression and feedback protection of multiple IGBTs in parallel are not considered, resulting in frequent burnout of IGBT devices due to overvoltage. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first objective of the present disclosure is to propose a method for overvoltage protection of multiple IGBTs in parallel, so as to achieve suppression and feedback protection when multiple IGBTs are connected in parallel and overvoltage occurs.

[0005] A second objective of the present disclosure is to provide a multi-IGBT parallel overvoltage protection device.

[0006] The third objective of the present disclosure is to provide a flow conversion system.

[0007] A fourth objective of the present disclosure is to provide a computer-readable storage medium.

[0008] A fifth object of the present disclosure is to provide a computer program product.

[0009] To achieve the above-mentioned purpose, the first embodiment of the present disclosure proposes a method for overvoltage protection of multiple IGBTs in parallel, comprising:

[0010] Obtaining main circuit voltages corresponding to a plurality of IGBTs connected in parallel;

[0011] If the main circuit voltage is greater than a first voltage threshold, reducing a switching frequency of a driving signal used when driving the IGBT;

[0012] If the main circuit voltage is greater than a second voltage threshold, reducing the operating current corresponding to the IGBT, wherein the second voltage threshold is greater than the first voltage threshold;

[0013] If the main circuit voltage is greater than a third voltage threshold, the IGBT is controlled to be in an on state, wherein the third voltage threshold is greater than the second voltage threshold.

[0014] Optionally, the method is applied to a power conversion system, the power conversion system includes a power converter and a pulse width modulation controller, the power converter includes the plurality of IGBTs connected in parallel, and the step of reducing the switching frequency of a driving signal used when driving the IGBTs includes:

[0015] The pulse width modulation controller is controlled to reduce a switching frequency of a driving signal output to the IGBT.

[0016] Optionally, the method is applied to a converter system, the converter system comprising a converter, a pulse width modulation controller and a converter controller, the converter comprising the plurality of IGBTs connected in parallel, and reducing the operating current corresponding to the IGBT comprises:

[0017] The converter controller and / or the PWM controller are controlled to reduce the operating current corresponding to the IGBT.

[0018] Optionally, the method is applied to a converter system, the converter system includes a converter and a pulse width modulation controller, the converter includes the plurality of IGBTs connected in parallel, and controlling the IGBTs to be in an on state includes:

[0019] Stop using the driving signal output by the pulse width modulation controller to drive the IGBT, and forcibly control the IGBT to be in an on state.

[0020] Optionally, after controlling the IGBT to be in an on state, the method further includes:

[0021] A shutdown control instruction is issued, wherein the shutdown control instruction is used to instruct the device where the IGBT is located to stop operating.

[0022] Optionally, the method is applied to a converter system, the converter system includes a converter and a converter controller, the converter includes the plurality of IGBTs connected in parallel, and after issuing the shutdown control instruction, the method further includes:

[0023] In response to receiving the shutdown control instruction, the converter is controlled by the converter controller to stop running.

[0024] To achieve the above-mentioned purpose, a second embodiment of the present disclosure provides a multi-IGBT parallel overvoltage protection device, comprising:

[0025] A voltage acquisition unit, used to acquire the main circuit voltage corresponding to the multiple IGBTs connected in parallel;

[0026] an overvoltage protection unit, configured to reduce a switching frequency of a driving signal used when driving the IGBT if the main circuit voltage is greater than a first voltage threshold;

[0027] The overvoltage protection unit is further configured to reduce the operating current corresponding to the IGBT if the main circuit voltage is greater than a second voltage threshold, wherein the second voltage threshold is greater than the first voltage threshold;

[0028] The overvoltage protection unit is further used to control the IGBT to be in an on state if the main circuit voltage is greater than a third voltage threshold, wherein the third voltage threshold is greater than the second voltage threshold.

[0029] To achieve the above-mentioned purpose, a third aspect of the present disclosure provides a power conversion system, including: a processor, and a memory communicatively connected to the processor;

[0030] Memory stores computer-executable instructions;

[0031] The processor executes the computer-executable instructions stored in the memory to implement the method shown in any one of the first aspects above.

[0032] To achieve the above-mentioned objectives, an embodiment of the fourth aspect of the present disclosure proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the method shown in any one of the above-mentioned first aspects.

[0033] To achieve the above-mentioned objective, a fifth aspect of the present disclosure provides a computer program product, including a computer program, which, when executed by a processor, implements the method shown in any one of the above-mentioned first aspects.

[0034] In summary, the method, device, system, storage medium and program product provided by the present disclosure obtain the main circuit voltage corresponding to multiple IGBTs connected in parallel; if the main circuit voltage is greater than the first voltage threshold, the switching frequency of the driving signal used to drive the IGBT is reduced; if the main circuit voltage is greater than the second voltage threshold, the working current corresponding to the IGBT is reduced, wherein the second voltage threshold is greater than the first voltage threshold; if the main circuit voltage is greater than the third voltage threshold, the IGBT is controlled to be in the on state, wherein the third voltage threshold is greater than the second voltage threshold. Therefore, suppression and feedback protection when multiple IGBTs are connected in parallel and overvoltage occurs can be achieved.

[0035] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0037] Figure 1 A schematic flow chart of a method for overvoltage protection of multiple IGBTs in parallel provided by an embodiment of the present disclosure;

[0038] Figure 2 A schematic diagram of the structure of a current conversion system provided by an embodiment of the present disclosure;

[0039] Figure 3 A schematic diagram of the structure of a multi-IGBT parallel overvoltage protection device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0041] The present disclosure is described in detail below with reference to specific embodiments.

[0042] In the first embodiment, if Figure 1 As shown, Figure 1 This is a flow chart of a method for overvoltage protection of multiple IGBTs in parallel provided by an embodiment of the present disclosure. The method can be implemented by a computer program and can be run on a device for overvoltage protection of multiple IGBTs in parallel. The computer program can be integrated into an application or run as an independent tool application.

[0043] The multi-IGBT parallel overvoltage protection device may be a converter system with a multi-IGBT parallel overvoltage protection function.

[0044] The multi-IGBT parallel overvoltage protection method may be executed by a converter system.

[0045] For example, the multi-IGBT parallel overvoltage protection method includes the following steps:

[0046] S101, obtaining a main circuit voltage corresponding to a plurality of IGBTs connected in parallel;

[0047] According to some embodiments, since multiple IGBTs are connected in parallel, that is, the collectors of all IGBTs are interconnected, and the emitters of all IGBTs are connected to each other, the corresponding main circuit voltage is the positive power supply voltage corresponding to the multiple IGBTs connected in parallel, that is, if the IGBT is N-type, then the corresponding main circuit voltage is the voltage corresponding to the collector; if the IGBT is P-type, then the corresponding main circuit voltage is the voltage corresponding to the emitter.

[0048] S102, if the main circuit voltage is greater than the first voltage threshold, reducing the switching frequency of the driving signal used when driving the IGBT;

[0049] According to some embodiments, the first voltage threshold refers to a threshold used when detecting that the strength of the main circuit voltage is at an alarm level. The first voltage threshold does not specifically refer to a fixed threshold, and the first voltage threshold can be determined according to actual application scenarios.

[0050] In some embodiments, reducing the switching frequency of the driving signal used to drive the IGBT can suppress the overvoltage problem of the main circuit voltage.

[0051] S103, if the main circuit voltage is greater than the second voltage threshold, reducing the operating current corresponding to the IGBT;

[0052] According to some embodiments, the second voltage threshold refers to a threshold used when detecting that the strength of the main circuit voltage is a primary fault level. The second voltage threshold does not specifically refer to a fixed threshold, and the second voltage threshold can be determined according to actual application scenarios.

[0053] In some embodiments, the second voltage threshold is greater than the first voltage threshold, that is, it is difficult to suppress the overvoltage of the main circuit voltage by simply reducing the switching frequency of the driving signal used to drive the IGBT, and further measures are needed to suppress the overvoltage problem of the main circuit voltage.

[0054] In some embodiments, reducing the operating current corresponding to the IGBT can reduce the overvoltage of the main circuit voltage and protect the IGBT from damage. Compared with reducing the switching frequency of the driving signal used to drive the IGBT, the overvoltage suppression effect is better.

[0055] In some embodiments, if the main circuit voltage is greater than the second voltage threshold, the operating current corresponding to the IGBT and the switching frequency of the driving signal used to drive the IGBT can be reduced at the same time, or only the operating current corresponding to the IGBT can be reduced. The specific adjustment can be made according to the actual application scenario.

[0056] S104: If the main circuit voltage is greater than the third voltage threshold, the IGBT is controlled to be in an on state.

[0057] According to some embodiments, the third voltage threshold refers to a threshold used when detecting that the strength of the main circuit voltage is a secondary fault level. The third voltage threshold does not specifically refer to a fixed threshold, and the third voltage threshold can be determined according to actual application scenarios.

[0058] In some embodiments, the third voltage threshold is greater than the second voltage threshold, that is, by reducing the operating current corresponding to the IGBT, or by simultaneously reducing the operating current corresponding to the IGBT and the switching frequency of the driving signal used to drive the IGBT, the overvoltage of the main circuit voltage cannot be suppressed. At this time, in order to protect the IGBT device from being damaged, it is necessary to control the IGBT to be in the on state to achieve the purpose of reducing the overvoltage, thereby ensuring the safety of the equipment.

[0059] In some embodiments, if the main circuit voltage is greater than the third voltage threshold, the operating current corresponding to the IGBT can be reduced while controlling the IGBT to be in the on state, or the IGBT can be controlled to be in the on state only, which can be adjusted according to the actual application scenario.

[0060] In summary, the method provided in this embodiment, by designing an overvoltage feedback composed of different voltage levels, can judge and feedback the overvoltage level under multiple IGBTs in parallel in real time, provide a feedback signal for the converter system, and adopt different overvoltage protection strategies for different feedback signals through combinational logic control, so as to realize suppression and feedback protection when multiple IGBTs are connected in parallel with overvoltage, thereby ensuring the safe operation of the entire converter.

[0061] This embodiment also provides another multi-IGBT parallel overvoltage protection method. This method can be applied to the converter system, such as Figure 2 As shown, the converter system includes a converter, a pulse width modulation (PWM) controller and a converter controller, and the converter includes a plurality of IGBTs connected in parallel.

[0062] The converter may be, for example, a high-power wind power converter, wherein a plurality of IGBTs connected in parallel are power semiconductor devices of the converter main circuit and are responsible for power conversion.

[0063] For example, the multi-IGBT parallel overvoltage protection method may include the following steps:

[0064] S201, obtaining a main circuit voltage corresponding to a plurality of IGBTs connected in parallel;

[0065] According to some embodiments, Figure 2As shown, the converter includes N N-type IGBTs from IGBT1 to IGBTN, where N is a positive integer greater than 1, and the collectors of the N N-type IGBTs are all connected to the positive DC power supply DC+, and the emitters of the N N-type IGBTs are all connected to the negative DC power supply DC-, thereby realizing parallel connection of the N N-type IGBTs. Since the N IGBTs are all N-type IGBTs, the main circuit voltage is the voltage corresponding to the collectors of the N N-type IGBTs.

[0066] In some embodiments, if the multiple IGBTs connected in parallel are P-type IGBTs, the emitters of the P-type IGBTs are all connected to the positive DC power supply DC+, the collectors of the P-type IGBTs are all connected to the negative DC power supply DC-, and the main circuit voltage is the voltage corresponding to the emitter of the P-type IGBT.

[0067] S202, if the main circuit voltage is greater than the first voltage threshold, controlling the pulse width modulation controller to reduce the switching frequency of the drive signal output to the IGBT;

[0068] It should be noted that when the pulse width modulation controller outputs a driving signal to the IGBT, it can output multiple driving signals and input them one by one to the gate of the IGBT, such as Figure 2 As shown; the same drive signal can also be synchronously input to the gates of multiple IGBTs.

[0069] S203, if the main circuit voltage is greater than the second voltage threshold, controlling the converter controller and / or the PWM controller to reduce the operating current corresponding to the IGBT;

[0070] According to some embodiments, when the operating current corresponding to the IGBT is reduced, the adjustment may be performed by reducing the current by 50% each time.

[0071] S204, if the main circuit voltage is greater than the third voltage threshold, stop using the drive signal output by the pulse width modulation controller to drive the IGBT, and force the IGBT to be in the on state;

[0072] S205, issuing a shutdown control command;

[0073] According to some embodiments, the shutdown control instruction is used to instruct the device in which the IGBT is located to stop operating, that is, to instruct the converter in which the IGBT is located to stop operating.

[0074] S206: In response to receiving the shutdown control instruction, controlling the converter to stop running through the converter controller.

[0075] In summary, the method provided in this embodiment, by designing an overvoltage feedback composed of different voltage levels, can judge and feedback the overvoltage level under multiple IGBTs in parallel in real time, provide a feedback signal for the converter system, and adopt different overvoltage protection strategies for different feedback signals through combinational logic control, so as to realize suppression and feedback protection when multiple IGBTs are connected in parallel with overvoltage, thereby ensuring the safe operation of the entire converter.

[0076] In order to implement the above embodiment, the present disclosure also proposes a multi-IGBT parallel overvoltage protection device.

[0077] like Figure 3 As shown, the multi-IGBT parallel overvoltage protection device 300 includes:

[0078] A voltage acquisition unit 301 is used to acquire the main circuit voltage corresponding to the multiple IGBTs connected in parallel;

[0079] The overvoltage protection unit 302 is used to reduce the switching frequency of the driving signal used when driving the IGBT if the main circuit voltage is greater than the first voltage threshold;

[0080] The overvoltage protection unit 302 is further configured to reduce the operating current corresponding to the IGBT if the main circuit voltage is greater than a second voltage threshold, wherein the second voltage threshold is greater than the first voltage threshold;

[0081] The overvoltage protection unit 302 is further configured to control the IGBT to be in an on state if the main circuit voltage is greater than a third voltage threshold, wherein the third voltage threshold is greater than the second voltage threshold.

[0082] Optionally, the method is applied to a power conversion system, the power conversion system includes a power converter and a pulse width modulation controller, the power converter includes a plurality of IGBTs connected in parallel, and reducing the switching frequency of a driving signal used when driving the IGBTs includes:

[0083] The pulse width modulation controller is controlled to reduce the switching frequency of the driving signal output to the IGBT.

[0084] Optionally, the method is applied to a converter system, the converter system includes a converter, a pulse width modulation controller and a converter controller, the converter includes a plurality of IGBTs connected in parallel, and reducing the working current corresponding to the IGBT includes:

[0085] The converter controller and / or the PWM controller are controlled to reduce the operating current corresponding to the IGBT.

[0086] Optionally, the method is applied to a converter system, the converter system includes a converter and a pulse width modulation controller, the converter includes a plurality of IGBTs connected in parallel, and controlling the IGBTs to be in a conducting state includes:

[0087] Stop using the driving signal output by the pulse width modulation controller to drive the IGBT, and forcibly control the IGBT to be in the on state.

[0088] Optionally, after controlling the IGBT to be in the on state, the method further includes:

[0089] A shutdown control instruction is issued, wherein the shutdown control instruction is used to instruct the device where the IGBT is located to stop operating.

[0090] Optionally, the method is applied to a converter system, the converter system includes a converter and a converter controller, the converter includes a plurality of IGBTs connected in parallel, and after issuing a shutdown control instruction, the method further includes:

[0091] In response to receiving the shutdown control instruction, the converter is controlled to stop running by the converter controller.

[0092] It should be noted that the above explanation of the embodiment of the multi-IGBT parallel overvoltage protection method is also applicable to the multi-IGBT parallel overvoltage protection device of this embodiment, and will not be repeated here.

[0093] In summary, the device provided by the embodiment of the present disclosure, by designing an overvoltage feedback composed of different voltage levels, can judge and feedback the overvoltage level under multiple IGBTs in parallel in real time, provide a feedback signal for the converter system, and adopt different overvoltage protection strategies for different feedback signals through combinational logic control, thereby realizing suppression and feedback protection when multiple IGBTs are connected in parallel with overvoltage, and ensuring the safe operation of the entire converter.

[0094] In order to implement the above embodiments, the present disclosure also proposes a power conversion system, including: a processor, and a memory connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0095] In order to implement the above embodiments, the present disclosure further proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0096] In order to implement the above embodiments, the present disclosure also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0097] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this disclosure shall comply with the relevant laws and regulations and shall not violate public order and good morals.

[0098] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0099] The present disclosure anticipates providing implementation schemes for users to selectively block the use or access of personal information data. That is, the present disclosure anticipates providing hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, risks can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0100] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0101] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0102] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present disclosure belong.

[0103] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0104] It should be understood that the various parts of the present disclosure can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0105] A person skilled in the art may understand that all or part of the steps in the above-mentioned embodiment method may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0106] In addition, each functional unit in each embodiment of the present disclosure may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0107] The storage medium mentioned above may be a read-only memory, a disk or an optical disk, etc. Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present disclosure. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present disclosure.

Claims

1. A method for overvoltage protection of multiple IGBTs in parallel, characterized in that: include: Obtaining main circuit voltages corresponding to a plurality of IGBTs connected in parallel; If the main circuit voltage is greater than a first voltage threshold, reducing a switching frequency of a driving signal used when driving the IGBT; If the main circuit voltage is greater than a second voltage threshold, reducing the operating current corresponding to the IGBT, wherein the second voltage threshold is greater than the first voltage threshold; If the main circuit voltage is greater than a third voltage threshold, the IGBT is controlled to be in an on state, wherein the third voltage threshold is greater than the second voltage threshold.

2. The method according to claim 1, characterized in that The method is applied to a current conversion system, the current conversion system includes a current converter and a pulse width modulation controller, the current converter includes the plurality of IGBTs connected in parallel, and the step of reducing the switching frequency of a driving signal used when driving the IGBTs includes: The pulse width modulation controller is controlled to reduce a switching frequency of a driving signal output to the IGBT.

3. The method according to claim 1, characterized in that The method is applied to a converter system, the converter system comprising a converter, a pulse width modulation controller and a converter controller, the converter comprising the plurality of IGBTs connected in parallel, and reducing the working current corresponding to the IGBT comprises: The converter controller and / or the PWM controller are controlled to reduce the operating current corresponding to the IGBT.

4. The method according to claim 1, characterized in that The method is applied to a current conversion system, the current conversion system includes a current converter and a pulse width modulation controller, the current converter includes the plurality of IGBTs connected in parallel, and the controlling the IGBTs to be in a conducting state includes: Stop using the driving signal output by the pulse width modulation controller to drive the IGBT, and forcibly control the IGBT to be in an on state.

5. The method according to claim 1, characterized in that After controlling the IGBT to be in the on state, the method further includes: A shutdown control instruction is issued, wherein the shutdown control instruction is used to instruct the device where the IGBT is located to stop operating.

6. The method according to claim 5, characterized in that The method is applied to a converter system, the converter system includes a converter and a converter controller, the converter includes the plurality of IGBTs connected in parallel, and after issuing a shutdown control instruction, the method further includes: In response to receiving the shutdown control instruction, the converter is controlled by the converter controller to stop running.

7. A multi-IGBT parallel overvoltage protection device, characterized in that: include: A voltage acquisition unit, used to acquire the main circuit voltage corresponding to the multiple IGBTs connected in parallel; an overvoltage protection unit, configured to reduce a switching frequency of a driving signal used when driving the IGBT if the main circuit voltage is greater than a first voltage threshold; The overvoltage protection unit is further configured to reduce the operating current corresponding to the IGBT if the main circuit voltage is greater than a second voltage threshold, wherein the second voltage threshold is greater than the first voltage threshold; The overvoltage protection unit is further used to control the IGBT to be in an on state if the main circuit voltage is greater than a third voltage threshold, wherein the third voltage threshold is greater than the second voltage threshold.

8. A current conversion system, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 6 when executed by a processor.

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

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