Power conversion apparatus and control method therefor, and power conversion system

Abstract

The present application relates to a power conversion apparatus and a control method therefor, and a power conversion system. The power conversion apparatus comprises a fire extinguishing module, a control module, a plurality of power devices and a plurality of temperature collection modules, wherein each power device is correspondingly provided with a temperature collection module used for collecting the temperature of the corresponding power device; and the control module is connected to each temperature collection module and the fire extinguishing module, and the control module is configured to: when the temperature of at least one power device reaches a first preset threshold value of the corresponding power device, trigger the fire extinguishing module to extinguish a fire inside the power conversion apparatus. That is, the fire extinguishing module is triggered to extinguish an open flame that is about to occur or has already occurred inside the power conversion apparatus, thereby protecting the power conversion apparatus, and avoiding the open flame spreading and causing a fire.

Description

Power conversion device, control method thereof, and power conversion system

[0001] This application claims priority to a domestic application filed with the Patent Office of China on January 23, 2024, with application number CN202410096094.0 and invention name “Power conversion device, control method thereof and power conversion system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of power electronics technology, and in particular to a power conversion device and a control method thereof, as well as a power conversion system. Background Art

[0003] Power converters encompass photovoltaic inverters, energy storage converters, motor controllers, and other converters with power conversion functions. They feature high energy density, compact size, and high integration. As power levels increase, the rated voltage and current of power converters increase, which in turn increases internal temperatures. If abnormal operating conditions occur, thermal runaway or even combustion can easily occur, leading to serious fires.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a power conversion device and a control method thereof and a power conversion system to address the above technical problems.

[0006] In a first aspect, the present application provides a power conversion device, comprising a fire extinguishing module, a control module, a plurality of power devices, and a plurality of temperature acquisition modules; each power device is provided with a corresponding temperature acquisition module for collecting the temperature of the corresponding power device; the control module is respectively connected to each temperature acquisition module and the fire extinguishing module, and the control module is configured as follows:

[0007] When the temperature of at least one of the power devices reaches a first preset threshold corresponding to the power device, the fire extinguishing module is triggered to extinguish the fire of the power conversion device.

[0008] In one embodiment, the fire extinguishing module includes a temperature-sensitive wire and an aerosol unit; the temperature-sensitive wire is connected to the aerosol unit, and the temperature-sensitive wire is used to ignite the aerosol unit when the temperature of at least one of the power devices reaches the first preset threshold value corresponding to the power device, so that the aerosol unit releases aerosol to extinguish the fire of the power conversion device.

[0009] In one embodiment, the power conversion device further includes a chassis and a tray; the tray is located inside the chassis, and the power device, the temperature acquisition module, and the control module are all located on the first surface of the tray; the temperature sensitive wire is arranged on the inner wall of the chassis and the edge of the first surface of the tray.

[0010] In one embodiment, the chassis includes a flange, a wire tie buckle is provided on the flange, and the temperature-sensitive wire is fixed to the flange by the wire tie buckle.

[0011] In one embodiment, the fire extinguishing module further includes a feedback unit; the feedback unit is connected to the external system controller through the control module, and the feedback unit is used to feedback a fault signal to the external system controller when the fire extinguishing module is triggered, so as to instruct the external system controller to control the circuit breaker connected to the power conversion device to disconnect according to the fault signal.

[0012] In one embodiment, the power conversion device further includes a plurality of AC and DC switching devices; the control module is connected to each of the AC and DC switching devices, and the control module is further configured to:

[0013] When the temperature of at least one of the power devices reaches a third preset threshold corresponding to the power device and is less than a second preset threshold, reducing the output power of the power conversion device;

[0014] When the temperature of at least one of the power devices reaches the second preset threshold corresponding to the power device, controlling each of the AC and DC switching devices to be disconnected;

[0015] Among them, the third preset threshold, the second preset threshold, and the first preset threshold increase in sequence.

[0016] In a second aspect, the present application further provides a method for controlling a power conversion device, for controlling the power conversion device as described in any of the above embodiments, the method for controlling the power conversion device comprising:

[0017] Acquiring the temperature of each of the power devices;

[0018] Determining whether the temperature of each of the power devices reaches the first preset threshold corresponding to the power device;

[0019] When the temperature of at least one of the power devices reaches a first preset threshold corresponding to the power device, the fire extinguishing module is triggered to extinguish the fire of the power conversion device.

[0020] In one embodiment, the control method of the power conversion device further includes:

[0021] When the fire extinguishing module is triggered, a fault signal is sent to an external system controller to instruct the external system controller to control the circuit breaker connected to the power conversion device to disconnect according to the fault signal.

[0022] In a third aspect, the present application also provides a power conversion device, which includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the control method of the power conversion device described in any of the above embodiments.

[0023] In a fourth aspect, the present application further provides a power conversion system, the power conversion system comprising a circuit breaker, an external system controller, and the power conversion device according to any one of the above embodiments;

[0024] The input end of the circuit breaker is connected to the power conversion device, the output end of the circuit breaker is used to connect to an external circuit, and the control end of the circuit breaker is connected to the external system controller;

[0025] The fire extinguishing module includes a feedback unit, which is connected to the external system controller through the control module. The feedback unit is used to feedback a fault signal to the external system controller when the fire extinguishing module is triggered, so as to instruct the external system controller to control the circuit breaker to open according to the fault signal.

[0026] The power conversion device, control method, and power conversion system described above, wherein the power conversion device can be a power converter, includes a fire extinguishing module, a control module, multiple power devices, and multiple temperature acquisition modules. A temperature acquisition module is provided for each power device to acquire the temperature of the corresponding power device; the control module is connected to each temperature acquisition module and the fire extinguishing module, and is configured to trigger the fire extinguishing module to extinguish the power conversion device when the temperature of at least one power device reaches a first preset threshold value for the corresponding power device. This triggers the fire extinguishing module to extinguish an open flame that is about to or has already occurred within the power conversion device, thereby protecting the power conversion device and preventing the open flame from spreading and causing a fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] FIG1 is a block diagram of a power conversion device according to an embodiment;

[0029] FIG2 is a schematic structural diagram of a power conversion device according to an embodiment;

[0030] FIG3 is a schematic flow chart of a control method for a power conversion device according to an embodiment;

[0031] FIG4 is a structural block diagram of a power conversion system in one embodiment. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0033] The power conversion device provided in the embodiment of the present application can be a power converter. In one embodiment, as shown in FIG1 , a power conversion device is provided, which includes: a fire extinguishing module 140 , a control module 150 , multiple power devices 110 , and multiple temperature acquisition modules 120 .

[0034] The fire extinguishing module 140 has the function of extinguishing open flames. The fire extinguishing module 140 can be composed of a fire extinguishing device that extinguishes fire based on physical and / or chemical principles. The specific structure of the fire extinguishing module 140 can be various and is not specifically limited here.

[0035] There are many power devices 110 inside the power conversion device, including but not limited to: functional modules, contactors, relays, capacitors, reactors, etc. The temperature acquisition module 120 has the function of acquiring the surface temperature of an object.

[0036] The specific structure of the temperature acquisition module 120 can be various and is not specifically limited herein. A temperature acquisition module 120 may be provided for each power device 110 within the power conversion device to acquire the temperature of the corresponding power device 110. Alternatively, a temperature acquisition module 120 may be provided for each of the more critical power devices 110 within the power conversion device to acquire the temperature of the corresponding power device 110.

[0037] Each power device 110 corresponds to a first preset threshold, a second preset threshold, and a third preset threshold, wherein the first preset threshold, the second preset threshold, and the third preset threshold decrease in sequence. Since different power devices 110 can withstand different maximum temperatures, the first preset threshold, the second preset threshold, and the third preset threshold of different power devices 110 may be different. For example, the first preset threshold of power device 110A is different from the first preset threshold of power device 110B, the second preset threshold of power device 110A is different from the second preset threshold of power device 110B, and the third preset threshold of power device 110A is also different from the third preset threshold of power device 110B. The first preset threshold, the second preset threshold, and the third preset threshold of power device 110A decrease in sequence, and the first preset threshold, the second preset threshold, and the third preset threshold of power device 110B decrease in sequence.

[0038] The control module 150 can be a central processing unit (CPU) within the power conversion device. The control module 150 is connected to each temperature acquisition module 120 to obtain the temperature of each power device 110 from each temperature acquisition module 120. The control module 150 is connected to the fire extinguishing module 140 to control the fire extinguishing module 140 based on the temperature of each power device 110.

[0039] Based on the above, the control module 150 is configured to trigger the fire extinguishing module 140 to extinguish the fire in the power conversion device when the temperature of at least one power device 110 reaches a first preset threshold value of the corresponding power device 110. That is, within the power conversion device, as long as the temperature of any one power device 110 reaches or exceeds its own first preset threshold value, for example, when a transient overheating and combustion condition such as thermal runaway or short circuit of the power device 110 occurs, the fire extinguishing module 140 is triggered to immediately extinguish the fire in the power conversion device, extinguishing the open flame and preventing the open flame from burning and spreading, thereby protecting the power conversion device.

[0040] In this embodiment, a fire extinguishing module 140 is used for the power conversion device to solve the problem of overheating inside the power conversion device. The use of this fire extinguishing module 140 can prevent open flames from spreading and causing fires.

[0041] When the fire extinguishing module 140 is triggered, the fault level of the power conversion device has reached the highest level, and an open fire is likely to have occurred inside the power conversion device. At this time, if the power conversion device is still connected to the power grid or battery through an external circuit breaker, it will easily cause the open fire to spread to the power grid or battery, causing a major accident.

[0042] To this end, in one embodiment, the fire extinguishing module 140 includes a feedback unit; wherein the feedback unit is connected to the external system controller through the control module 150, and the feedback unit is used to feedback a fault signal to the external system controller when the fire extinguishing module 140 is triggered, so as to instruct the external system controller to control the circuit breaker connected to the power conversion device to disconnect according to the fault signal, thereby preventing the open fire from spreading to the power grid or the battery side. wherein, the external system controller is the controller of the external system, and the external system controller serves as the upper-level controller of the control module 150. The circuit breaker is generally an AC circuit breaker on the low-voltage side of the transformer. Disconnecting the circuit breaker can shut down the entire external system and lose power without AC power.

[0043] In one embodiment, the fire extinguishing module 140 further includes a temperature-sensitive wire and an aerosol unit; wherein the temperature-sensitive wire is connected to the aerosol unit, and the temperature-sensitive wire is used to ignite the aerosol unit when the temperature of at least one power device 110 reaches a first preset threshold value of the corresponding power device 110, so that the aerosol unit releases aerosol to extinguish the fire in the power conversion device. The temperature-sensitive wire can ignite the aerosol unit according to a trigger signal from the control module 150, or it can ignite the aerosol unit by sensing overtemperature and spontaneous combustion. Inside the power conversion device, as long as the temperature of one power device 110 reaches or exceeds its own first preset threshold value, indicating that the temperature inside the power conversion device is already very high, the temperature-sensitive wire immediately ignites the aerosol unit, causing the aerosol unit to release aerosol to extinguish the fire inside the power conversion device.

[0044] In the embodiment of the present application, the fire extinguishing module 140 includes a feedback unit, a temperature-sensitive line and an aerosol unit, so that the structure of the fire extinguishing module 140 is simple, easy to implement and low in cost. At the same time, the aerosol unit releases aerosol to extinguish the open flame inside the power conversion device, which can also achieve a good fire extinguishing effect.

[0045] In one embodiment, referring to Figure 2, the power conversion device also includes a chassis 210 and a tray 220; wherein, the tray 220 is located inside the chassis 210; the power device 110, the temperature acquisition module 120 and the control module 150 are all located on the first surface of the tray 220; the temperature sensitive line is arranged on the inner wall of the chassis 210 and the edge of the first surface of the tray 220.

[0046] In this embodiment, since the flames burn along the inner wall of the chassis 210 and the edge of the first surface of the tray 220, the edges of the inner wall of the chassis 210 and the first surface of the tray 220 are relatively hot. Therefore, temperature-sensitive wires can be placed along the inner wall of the chassis 210 and the edge of the first surface of the tray 220 to ensure effective triggering of the fire extinguishing module 140. Furthermore, this arrangement of temperature-sensitive wires facilitates the securement, installation, and maintenance of the aerosol unit, providing increased reliability.

[0047] In one embodiment, referring to FIG2 , the chassis 210 includes a flange 2101 , on which a wire buckle is provided. The temperature-sensitive wire is fixed to the flange 2101 by the wire buckle, which is also conducive to the fixation, installation, and operation and maintenance of the aerosol unit.

[0048] In one embodiment, the temperature acquisition module 120 includes a thermistor temperature sensor.

[0049] Exemplarily, the temperature acquisition module 120 includes an NTC thermistor temperature sensor.

[0050] In this embodiment, the temperature acquisition module 120 includes a thermistor temperature sensor, which simplifies the structure of the temperature acquisition module 120 and further simplifies the structure of the power conversion device.

[0051] In one embodiment, continuing to refer to Figure 1, the power conversion device also includes a plurality of AC and DC switching devices 130; the control module 150 is respectively connected to each AC and DC switching device 130, and the control module 150 is further configured to: reduce the output power of the power conversion device when the temperature of at least one power device 110 reaches a third preset threshold value of the corresponding power device 110 and is less than the second preset threshold value; and control each AC and DC switching device 130 to be disconnected when the temperature of at least one power device 110 reaches the second preset threshold value of the corresponding power device 110.

[0052] The AC / DC switching device 130 can be a DC switching element, an AC switching element, or an AC / DC switching element, and is not specifically limited herein. The control module 150 is connected to each AC / DC switching device 130 to control each AC / DC switching device 130 based on the temperature of each power device 110.

[0053] In the embodiment of the present application, when the temperature of at least one power device 110 reaches the third preset threshold value of the corresponding power device 110 and is less than the second preset threshold value, the output power of the power conversion device is reduced. That is, within the power conversion device, as long as the temperature of any power device 110 reaches or exceeds its own third preset threshold value but has not yet reached the second preset threshold value, the control module 150 controls the output power of the power conversion device to reduce the temperature inside the power conversion device, prevent the power conversion device from being overheated and affecting its performance, thereby achieving the first level of protection for the power conversion device.

[0054] When the temperature of at least one power device 110 reaches the second preset threshold of the corresponding power device 110, each AC / DC switch device 130 is controlled to be disconnected. That is, within the power conversion device, if the temperature of any power device 110 reaches or exceeds its own second preset threshold, the control module 150 controls each AC / DC switch device 130 within the power conversion device to be disconnected, i.e., controls the power conversion device to shut down due to a fault, thereby releasing the internal temperature of the power conversion device and preventing the power conversion device from being damaged due to excessive temperature, thereby achieving the second level of protection for the power conversion device.

[0055] When the temperature of at least one power device 110 reaches a first preset threshold value for the corresponding power device 110, the fire extinguishing module 140 is triggered to extinguish the fire in the power conversion device. That is, within the power conversion device, if the temperature of any power device 110 reaches or exceeds its own first preset threshold value, for example, when a thermal runaway or short circuit of the power device 110 causes a transient overheating and combustion condition, the fire extinguishing module 140 is triggered to extinguish the fire in the power conversion device simultaneously with the power conversion device's fault shutdown, extinguishing the open flame and preventing the open flame from burning and spreading, thereby achieving the third level of protection for the power conversion device.

[0056] In the embodiment of the present application, three-level protection is adopted for the power conversion device to solve the internal overtemperature problem of the power conversion device. The three-level protection can cover various basic overtemperature scenarios, thereby effectively and reliably protecting the power conversion device, identifying overtemperature faults, and avoiding the expansion of faults.

[0057] In one embodiment, as shown in Figure 3, a control method for a power conversion device is provided. The control method for a power conversion device is used to control a power conversion device such as any of the above embodiments, and can be executed by the control module 150 in the power conversion device in any of the above embodiments. The control method for a power conversion device includes steps 302-306.

[0058] Step 302: Acquire the temperature of each power device.

[0059] The control module 150 in the power conversion device may acquire the temperature of each power device 110 from each temperature acquisition module 120 in the power conversion device.

[0060] Step 304 : Determine whether the temperature of each power device reaches a first preset threshold value of the corresponding power device.

[0061] Among them, the control module 150 in the power conversion device can determine whether the temperature of each power device 110 reaches the first preset threshold, the second preset threshold or the third preset threshold of the corresponding power device 110, wherein the third preset threshold, the second preset threshold and the first preset threshold increase in sequence.

[0062] Step 306 : When the temperature of at least one power device reaches a first preset threshold value of the corresponding power device, trigger the fire extinguishing module to extinguish the fire of the power conversion device.

[0063] In one embodiment, the control method of the power conversion device further includes the step of sending a fault signal to an external system controller when the fire extinguishing module is triggered, to instruct the external system controller to control the circuit breaker connected to the power conversion device to disconnect according to the fault signal.

[0064] In one embodiment, the control method of the power conversion device also includes the steps of: reducing the output power of the power conversion device when the temperature of at least one power device reaches a third preset threshold of the corresponding power device and is less than the second preset threshold; and controlling each AC and DC switching device to disconnect when the temperature of at least one power device reaches the second preset threshold of the corresponding power device.

[0065] In this embodiment, three-level protection is adopted for the power conversion device to solve the internal overtemperature problem of the power conversion device. The three-level protection can cover various basic overtemperature scenarios, thereby effectively and reliably protecting the power conversion device, identifying overtemperature faults, and avoiding the expansion of faults.

[0066] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0067] In one embodiment, as shown in FIG4 , a power conversion system is provided, comprising a circuit breaker 420, an external system controller 410, and a power conversion device according to any of the above embodiments; wherein the input end of the circuit breaker 420 is connected to the power conversion device, the output end of the circuit breaker 420 is connected to an external circuit, and the control end of the circuit breaker 420 is connected to the external system controller 410. The external circuit may be a power grid or a battery.

[0068] In one embodiment, with continued reference to FIG4 , the fire extinguishing module 140 includes a feedback unit 1402 , which is connected to the external system controller 410 through the control module 150 . When the fire extinguishing module 140 is triggered, the feedback unit 1402 feeds back a fault signal to the external system controller 410 to instruct the external system controller 410 to control the circuit breaker 420 to disconnect according to the fault signal.

[0069] In one embodiment, continuing to refer to Figure 4, the fire extinguishing module 140 also includes a temperature-sensitive wire and an aerosol unit 1401; wherein, the temperature-sensitive wire is connected to the aerosol unit 1401, and the temperature-sensitive wire is used to ignite the aerosol unit 1401 when the temperature of at least one power device 110 reaches a first preset threshold value of the corresponding power device 110, so that the aerosol unit 1401 releases aerosol to extinguish the power conversion device.

[0070] In one embodiment, with continued reference to FIG4 , the feedback unit 1402 includes a normally closed node and a DI circuit. When the fire extinguishing module 140 is triggered, the normally closed node in the feedback unit 1402 is actuated, and the signal of the normally closed node is fed back to the external system controller 410 via the DI circuit to instruct the external system controller 410 to control the circuit breaker 420 connected to the power conversion device to disconnect according to the DI signal.

[0071] In one embodiment, a power conversion device is further provided, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in any of the above method embodiments when executing the computer program.

[0072] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0073] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0074] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A power conversion device, characterized in that, The power conversion device includes a fire extinguishing module, a control module, a plurality of power devices, and a plurality of temperature acquisition modules; each of the power devices is correspondingly provided with one of the temperature acquisition modules for acquiring the temperature of the corresponding power device; the control module is respectively connected to each of the temperature acquisition modules and the fire extinguishing module, and the control module is configured to: When the temperature of at least one of the power devices reaches the first preset threshold corresponding to the power device, trigger the fire extinguishing module to extinguish the fire of the power conversion device.

2. The power conversion device according to claim 1, wherein The fire extinguishing module includes a temperature-sensitive wire and an aerosol unit; the temperature-sensitive wire is connected to the aerosol unit, and the temperature-sensitive wire is used to ignite the aerosol unit when the temperature of at least one of the power devices reaches the first preset threshold corresponding to the power device, so that the aerosol unit releases aerosol to extinguish the fire of the power conversion device.

3. The power conversion device according to claim 2, characterized in that, The power conversion device further includes a chassis and a tray; the tray is located inside the chassis, and the power device, the temperature acquisition module, and the control module are all located on the first surface of the tray; the temperature-sensitive wire is arranged at the edge of the inner wall of the chassis and the first surface of the tray.

4. The power conversion device according to claim 3, characterized in that, The chassis includes a flanging, and a wire tie is arranged on the flanging, and the temperature-sensitive wire is fixed to the flanging by the wire tie.

5. The power conversion device according to claim 2, characterized in that, The fire extinguishing module further includes a feedback unit; the feedback unit is connected to an external system controller through the control module, and the feedback unit is used to feedback a fault signal to the external system controller when the fire extinguishing module is triggered, so as to instruct the external system controller to control the circuit breaker connected to the power conversion device to disconnect according to the fault signal.

6. The power conversion device according to claim 1, characterized in that, The power conversion device further includes a plurality of AC / DC switch devices; the control module is respectively connected to each of the AC / DC switch devices, and the control module is further configured to: When the temperature of at least one of the power devices reaches the third preset threshold value corresponding to the power device and is less than the second preset threshold, reduce the output power of the power conversion device; When the temperature of at least one of the power devices reaches the second preset threshold corresponding to the power device, control each of the AC / DC switch devices to disconnect; Wherein, the third preset threshold, the second preset threshold, and the first preset threshold increase in sequence.

7. A control method for a power conversion device, characterized in that For controlling the power conversion device according to any one of claims 1-6, the control method of the power conversion device includes: Obtain the temperatures of the respective power devices; Judge whether the temperatures of the respective power devices reach the first preset threshold corresponding to the power device; When the temperature of at least one of the power devices reaches the first preset threshold corresponding to the power device, trigger the fire extinguishing module to extinguish the fire of the power conversion device.

8. The method according to claim 7, wherein The control method of the power conversion device further includes: Send a fault signal to an external system controller when the fire extinguishing module is triggered, so as to instruct the external system controller to control the circuit breaker connected to the power conversion device to disconnect according to the fault signal.

9. A power conversion device, characterized in that, The power conversion device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the control method of the power conversion device according to any one of claims 7 to 8.

10. A power conversion system, characterized in that, The power conversion system includes a circuit breaker, an external system controller, and the power conversion device according to any one of claims 1-6; The input end of the circuit breaker is connected to the power conversion device, the output end of the circuit breaker is used to be connected to an external circuit, and the control end of the circuit breaker is connected to the external system controller; The fire extinguishing module includes a feedback unit. The feedback unit is connected to the external system controller through the control module. The feedback unit is configured to feedback a fault signal to the external system controller when the fire extinguishing module is triggered, so as to instruct the external system controller to control the circuit breaker to trip according to the fault signal.

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