High-voltage direct-current power exchange system and compressor

Abstract

The application discloses a high-voltage direct alternating current power exchange system and a compressor and relates to the technical field of direct alternating current power exchange. The high-voltage direct alternating current power exchange system comprises a power supply module, a power transformation module, a control module and a cooling module. The power supply module is used for transmitting alternating current generated by a power station to the power transformation module. The application is provided with the power supply module, the power transformation module, the control module and the cooling module. The cooling module comprises a compression unit, a heating unit and a temperature detection unit. The compression unit is used for compressing refrigerant. The heating unit is used for heating the compressor when the compressor stops running. The temperature detection unit is used for detecting the internal temperature of the compressor and the external environment temperature and sending data to the controller. The controller controls the heating power of the heating unit according to the external environment temperature to keep the internal temperature of the compressor constant, so that the compressor can be self-heated when it stops running, thereby preventing the refrigerant from forming liquid and causing impact on the inside of the compressor when starting.

Description

Technical Field

[0001] This invention relates to the field of DC-AC power swapping technology, specifically to a high-voltage DC-AC power swapping system and compressor. Background Technology

[0002] High-voltage direct-current (HVDC) battery swapping systems are a technology for transmitting electricity. They convert alternating current (AC) to direct current (DC) and transmit it via high-voltage DC, then convert the DC back to AC at the receiving end. The main advantages of this system are its ability to transmit power over long distances with low energy loss. Furthermore, HVDC battery swapping systems can also be used to connect power systems with different frequencies or different power grids.

[0003] High-voltage direct current (HVDC) battery swapping systems mainly include power plants, converter stations, DC transmission lines, and inverter stations. During the operation of converter and inverter stations, cooling equipment, such as compressors, is required. In general, at low ambient temperatures, the refrigerant inside the compressor may not completely vaporize, and some of the refrigerant may form liquid, causing liquid to accumulate at the bottom of the compressor. When the unit is started, the compressor begins to run, and the liquid refrigerant droplets inside the compressor impact the inner wall of the compressor. Prolonged liquid slugging will damage the compressor. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-voltage DC-AC power exchange system and compressor, which solves the problem that the refrigerant inside the compressor is not completely vaporized, and some of the refrigerant forms liquid, causing liquid to accumulate at the bottom of the compressor. When the unit is turned on and the compressor starts running, the liquid droplets formed by the liquid refrigerant inside the compressor impact the inner wall of the compressor, and prolonged liquid slugging will damage the compressor.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage AC / DC power conversion system, comprising a power supply module, a transformer module, a control module, and a cooling module, wherein: the power supply module is used to transmit AC power generated by the power plant to the transformer module; the transformer module is used to convert the received AC power into DC power for transmission, and to convert the DC power back into AC power at the receiving end; the control module is responsible for real-time monitoring of parameters and adjusting the operation of the converter and inverter as needed, the parameters including current, voltage, and power flow; the cooling module is used to process the refrigerant to maintain the temperature of the power supply module and transformer module within a suitable range to ensure normal operation, and can self-heat during shutdown to prevent the refrigerant from forming a liquid and causing impact to the compressor interior during startup.

[0006] Furthermore, the processing steps of the substation module for the AC power received from the power supply module are as follows: S1, the received AC power is rectified into DC power using a rectifier and transmitted to the transmission line. The control module detects the current and voltage in real time, and the cooling module dissipates heat during the rectifier process; S2, the DC power transmitted through the transmission line is inverted by an inverter to convert the DC power into the required AC power frequency and voltage, and then transmitted to the target power grid.

[0007] Furthermore, the cooling module includes a compression unit, a heating unit, and a temperature detection unit, wherein: The compression unit is used to compress the refrigerant, the heating unit is used to heat the compressor when it stops running, and the temperature detection unit is used to detect the internal temperature of the compressor and the external ambient temperature, and send the data to the controller. The controller controls the heating power of the heating unit according to the external ambient temperature to keep the internal temperature of the compressor constant.

[0008] A compressor, including a housing and an end cover fixed to the front of the housing, is used in the aforementioned high-voltage AC / DC power conversion system. The housing includes an inner shell and an outer shell, with the outer shell fixed to the surface of the inner shell. A heating chamber is formed between the inner shell and the outer shell, and a heating component is installed inside the heating chamber to heat the inner shell, thereby vaporizing the liquid refrigerant inside the housing when the compressor stops running. An insulation pad is also installed inside the heating chamber between the inner and outer shells for heat preservation. A temperature detection component is also installed on the surface of the compressor to detect the temperature and send a temperature signal to a controller, enabling the controller to control the heating component for adaptive heating. Furthermore, the heating assembly includes heaters and a housing, with a plurality of heaters evenly arrayed on the housing. A mounting plate is fixedly connected to the surface of the housing, and a mounting block is fixedly connected to the surface of the outer shell. The mounting plate and the mounting block are fixedly connected by screws. The surface of the housing is movably connected to the surfaces of the outer shell and the inner shell, and the surface of the heater is movably connected to the surface of the inner shell.

[0009] Furthermore, the surface of the container is provided with a mounting groove, the surface of the heater is movably connected to the inner wall of the mounting groove, the surface of the heater is integrally formed with a mounting protrusion, the surface of the mounting protrusion is movably connected to the inner wall of the mounting groove; a screw is threadedly connected to the surface of the mounting protrusion, the screw thread passes through the mounting protrusion and is threadedly connected to the inner wall of the mounting groove.

[0010] Furthermore, a fixing plate is fixedly connected to the surface of the heat insulation pad, and a fixing member is integrally formed on the surface of the fixing plate. A fixing groove is opened on the surface of the container, and the surface of the fixing member is movably connected to the inner sidewall of the fixing groove. The fixing member is fixedly connected to the fixing groove by fastening screws.

[0011] Furthermore, a guide plate is fixedly connected to the side of the insulation pad away from the fixed plate. The surface of the guide plate is integrally formed with a guide protrusion. A guide groove is opened inside the heating cavity. The surface of the guide protrusion is movably connected to the inner wall of the guide groove.

[0012] Furthermore, the surface of the fixing plate is integrally formed with a connector, and the surface of the assembly is provided with a connector groove, and the surface of the connector is movably connected to the inner wall of the connector groove.

[0013] Furthermore, the temperature detection component includes an ambient temperature detector and an internal temperature detector, the ambient temperature detector being fixed to the surface of the housing, and the internal temperature detector being fixedly connected to the surface of the end cap.

[0014] The present invention has the following beneficial effects: (1) The high voltage AC-DC power swapping system is equipped with a power supply module, a transformer module, a control module and a cooling module. The cooling module includes a compression unit, a heating unit and a temperature detection unit. The compression unit is used to compress the refrigerant. The heating unit is used to heat the compressor when it stops running. The temperature detection unit is used to detect the internal temperature of the compressor and the external ambient temperature and send the data to the controller. The controller controls the heating power of the heating unit according to the external ambient temperature to keep the internal temperature of the compressor constant, so that the compressor can self-heat when it stops, which is used to prevent the refrigerant from forming liquid and causing impact to the inside of the compressor when it starts.

[0015] (2) The compressor, by setting up a heating chamber, heating components, and temperature detection components, compresses the coolant entering the inner shell to cool down electrical equipment such as transformers and inverters in the high-voltage DC-AC power conversion system. When the compressor stops running, the controller causes the heating components in the heating chamber located between the inner and outer shells to heat up, thereby heating the compressor and keeping its internal temperature at the temperature at which the coolant vaporizes, preventing the coolant inside from forming liquid. The temperature detection components include an ambient temperature detector and an internal temperature detector. The ambient temperature detector is fixed on the surface of the outer shell to detect the temperature of the external environment, and the internal temperature detector is fixedly connected to the surface of the end cover to detect the temperature inside the inner shell. Based on the temperature difference between the inside and outside, the heater adjusts the heating power to achieve effective heating. This solves the problem that the refrigerant inside the compressor does not completely vaporize, and some refrigerant forms liquid, causing liquid to accumulate at the bottom of the compressor. After the unit is started, the compressor starts running, and the liquid droplets formed by the liquid refrigerant inside the compressor hit the inner wall of the compressor. Long-term liquid hammer will damage the compressor.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-voltage DC-AC power swapping system of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of the compressor of the present invention.

[0019] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle.

[0020] Figure 4 This is a schematic diagram of the structure of the compressor heating chamber of the present invention.

[0021] Figure 5 This is a schematic diagram of the compressor assembly of the present invention.

[0022] Figure 6 This is a schematic diagram of the compressor connector of the present invention.

[0023] Figure 7 This is a schematic diagram of the compressor end cover of the present invention.

[0024] In the diagram, 1 is the housing; 101 is the inner shell; 102 is the outer shell; 2 is the end cap; 3 is the heating chamber; 4 is the insulation pad; 5 is the heater; 6 is the assembly; 7 is the mounting plate; 8 is the mounting block; 9 is the mounting groove; 10 is the mounting protrusion; 11 is the screw; 12 is the fixing plate; 13 is the fixing component; 14 is the fixing groove; 15 is the guide plate; 16 is the guide protrusion; 17 is the guide groove; 18 is the connector; 19 is the connector groove; 20 is the ambient temperature detector; and 21 is the internal temperature detector. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0027] Please see Figure 1 This invention provides a technical solution: a high-voltage DC / AC power swapping system, comprising a power supply module, a transformer module, a control module, and a cooling module, wherein: the power supply module is used to transmit AC power generated by the power plant to the transformer module; the transformer module is used to convert the received AC power into DC power for transmission, and to convert DC power back into AC power at the receiving end; the control module is responsible for real-time monitoring of parameters and adjusting the operation of the converter and inverter as needed, including parameters such as current, voltage, and power flow; the cooling module is used to handle the refrigerant to keep the temperature of the power supply module and transformer module within a suitable range to ensure normal operation, and can self-heat when shut down to prevent the refrigerant from forming a liquid and causing impact to the compressor interior during startup.

[0028] Specifically, the substation module processes the AC power received from the power supply module in the following steps: S1, the received AC power is rectified into DC power using a rectifier and transmitted to the transmission line. The control module monitors the current and voltage in real time, and the cooling module dissipates heat during the rectifier process. S2, the DC power transmitted through the transmission line is inverted by an inverter to convert the DC power into the required AC power frequency and voltage and then transmitted to the target power grid.

[0029] In this implementation plan, the converter station is responsible for converting the AC power generated by the power plant into DC power, which typically involves using a rectifier to convert the AC power into DC power and transmitting it through DC transmission lines.

[0030] DC transmission lines are a key component of HVDC systems. They are used to transmit direct current at high voltage and high current. DC transmission lines typically consist of large insulated conductors and supporting structures, and are fixed to the ground or towers by insulators.

[0031] The inverter station is located at the receiving end of the HVDC system and is responsible for converting DC power back to AC power. The inverter station uses inverters to convert DC power into the required AC power frequency and voltage, and then transmits it to the target grid or load. The control system is responsible for monitoring parameters such as current, voltage, and power flow in real time, and adjusting the operation of the converter and inverter as needed.

[0032] Specifically, the cooling module includes a compression unit, a heating unit, and a temperature detection unit. The compression unit is used to compress the refrigerant, the heating unit is used to heat the refrigerant when the compressor stops running, and the temperature detection unit is used to detect the internal temperature of the compressor and the external ambient temperature, and send the data to the controller. The controller controls the heating power of the heating unit according to the external ambient temperature to keep the internal temperature of the compressor constant.

[0033] In this implementation scheme, it is assumed that the temperature change inside the tank follows an exponential decay law. The exponential decay part of the formula takes into account the influence of the heater on the internal temperature of the tank, and the rate of exponential decay is determined by the thermal conductivity coefficient. The decision took into account the contribution of the heater power to the internal temperature of the tank, where the heating power... Divide by thermal conductivity and tank surface area The product of and gives the rate of temperature change inside the tank per unit time. The exponential decay part describes the trend of temperature change, which helps guide the operation of the heater and ensures that the coolant inside is in a vaporized state when the compressor stops running, without the temperature becoming too high.

[0034] like Figures 2-7A compressor includes a housing 1 and an end cover 2 fixed to the front of the housing 1, used in a high-voltage DC-AC power conversion system. The housing 1 includes an inner shell 101 and an outer shell 102. The outer shell 102 is fixed to the surface of the inner shell 101. A heating chamber 3 is formed between the inner shell 101 and the outer shell 102. A heating component is provided inside the heating chamber 3 for heating the inner shell 101, which is used to vaporize the liquid refrigerant inside the housing 1 when the compressor stops running. A heat-insulating pad 4 is also provided inside the heating chamber 3 between the inner shell 101 and the outer shell 102 for heat preservation. A temperature detection component is also provided on the surface of the compressor for temperature detection, which is used to send a temperature signal to the controller so that the controller controls the heating component to perform adaptive heating.

[0035] Specifically, the heating assembly includes heaters 5 and a housing 6. Several heaters 5 are evenly arrayed and installed on the housing 6. A mounting plate 7 is fixedly connected to the surface of the housing 6, and a mounting block 8 is fixedly connected to the surface of the outer shell 102. The mounting plate 7 and the mounting block 8 are fixedly connected by screws. The surface of the housing 6 is movably connected to the surfaces of the outer shell 102 and the inner shell 101, and the surface of the heaters 5 is movably connected to the surface of the inner shell 101.

[0036] In this embodiment, the internal components of the compressor compress the coolant entering the inner shell 101 to cool the electrical equipment such as transformers and inverters in the high-voltage DC-AC power conversion system. When the compressor stops running, the controller causes the heating components in the heating chamber 3 located between the inner shell 101 and the outer shell 102 to heat the compressor, keeping its internal temperature at the temperature at which the coolant vaporizes, preventing the coolant inside from forming a liquid. According to the temperature difference between the inside and outside, the heater 5 adjusts the heating power to achieve effective heating. At the same time, a heat insulation pad 4 is also provided inside the heating chamber 3 to keep the heat in place and prevent the heat from the heater 5 from dissipating too quickly.

[0037] Specifically, the surface of the container 6 is provided with a mounting groove 9, the surface of the heater 5 is movably connected to the inner wall of the mounting groove 9, the surface of the heater 5 is integrally formed with a mounting protrusion 10, the surface of the mounting protrusion 10 is movably connected to the inner wall of the mounting groove 9, and a screw 11 is threadedly connected to the surface of the mounting protrusion 10, the screw 11 threaded through the mounting protrusion 10 and threadedly connected to the inner wall of the mounting groove 9.

[0038] In this embodiment, the heater 5 is mounted on the assembly 6, and a mounting plate 7 is fixedly connected to the assembly 6. A mounting block 8 is fixedly connected to the surface of the outer shell 102. During installation, the assembly 6 is inserted into the heating chamber 3, and the mounting plate 7 and the mounting block 8 are fixedly connected using screws. The surface of the assembly 6 is provided with a mounting groove 9, and the surface of the heater 5 is movably connected to the inner wall of the mounting groove 9. The heater 5 is placed inside the mounting groove 9 so that the mounting protrusion 10 on it contacts the mounting groove 9, and is fixed using screws 11, which facilitates the disassembly and installation of the heater 5.

[0039] Specifically, a fixing plate 12 is fixedly connected to the surface of the insulation pad 4, and a fixing member 13 is integrally formed on the surface of the fixing plate 12. A fixing groove 14 is opened on the surface of the container 6. The surface of the fixing member 13 is movably connected to the inner side wall of the fixing groove 14, and the fixing member 13 is fixedly connected to the fixing groove 14 by fastening screws.

[0040] A guide plate 15 is fixedly connected to the side of the heat insulation pad 4 away from the fixed plate 12. The surface of the guide plate 15 is integrally formed with a guide protrusion 16. A guide groove 17 is opened inside the heating cavity 3. The surface of the guide protrusion 16 is movably connected to the inner wall of the guide groove 17.

[0041] The surface of the fixing plate 12 is integrally formed with a connector 18, and the surface of the assembly 6 is provided with a connector groove 19. The surface of the connector 18 is movably connected to the inner side wall of the connector groove 19.

[0042] In this embodiment, the insulation pad 4 has a fixing plate 12 and a guide plate 15 on both sides. After the assembly 6 is installed, the insulation pad 4 can be slid into the heating cavity 3 by using the guide plate 15 and the guide groove 17 in the heating cavity 3. The fixing plate 12 has a fixing member 13 integrally formed on its surface, which can correspond to the fixing groove 14 on the assembly 6 and be fixed by fastening screws. The fixing plate 12 has a plug-in member 18 integrally formed on its surface, which can be connected to the plug-in groove 19 on the assembly 6 during installation, which is convenient for installation and positioning.

[0043] Specifically, the temperature detection component includes an ambient temperature detector 20 and an internal temperature detector 21. The ambient temperature detector 20 is fixed to the surface of the housing 102, and the internal temperature detector 21 is fixedly connected to the surface of the end cap 2.

[0044] In this embodiment, the ambient temperature detector 20 is fixed on the surface of the outer shell 102 to detect the temperature of the external environment, and the internal temperature detector 21 is fixedly connected to the surface of the end cover 2 to detect the temperature inside the inner shell 101. Based on the temperature difference between the inside and outside, the heater 5 adjusts the heating power to achieve effective heating.

[0045] During operation, the internal components of the compressor compress the coolant entering the inner shell 101, thereby cooling the electrical equipment such as transformers and inverters in the high-voltage DC-AC power conversion system. When the compressor stops running, the controller causes the heating components in the heating chamber 3 located between the inner shell 101 and the outer shell 102 to heat the compressor, maintaining its internal temperature at the temperature at which the coolant vaporizes and preventing the coolant from forming a liquid inside. The temperature detection components include an ambient temperature detector 20 and an internal temperature detector 21. The ambient temperature detector 20 is fixed to the surface of the outer shell 102 to detect the temperature of the external environment, while the internal temperature detector 21 is fixedly connected to the surface of the end cover 2 to detect the temperature inside the inner shell 101. Based on the temperature difference between the inside and outside, the heater 5 adjusts its heating power to achieve effective heating. At the same time, a heat insulation pad 4 is also provided inside the heating chamber 3 to keep the heat in place and prevent the heater 5 from losing heat too quickly.

[0046] The heater 5 is mounted on the assembly 6, and a mounting plate 7 is fixedly connected to the assembly 6. A mounting block 8 is fixedly connected to the surface of the outer shell 102. During installation, the assembly 6 is inserted into the heating chamber 3, and the mounting plate 7 and the mounting block 8 are fixedly connected using screws. The surface of the assembly 6 is provided with a mounting groove 9, and the surface of the heater 5 is movably connected to the inner wall of the mounting groove 9. The heater 5 is placed inside the mounting groove 9 so that the mounting protrusion 10 on it contacts the mounting groove 9, and is fixed with screws 11, which facilitates the disassembly and installation of the heater 5.

[0047] In addition, to prevent heat loss, there is an insulation pad 4 inside the heating chamber 3. The insulation pad 4 has a fixing plate 12 and a guide plate 15 on both sides. After the assembly 6 is installed, the insulation pad 4 can be slid into the heating chamber 3 by using the guide plate 15 and the guide groove 17 in the heating chamber 3. The fixing plate 12 has a fixing member 13 integrally formed on its surface, which can correspond to the fixing groove 14 on the assembly 6 and be fixed by fastening screws. The fixing plate 12 has a plug-in member 18 integrally formed on its surface, which can be connected to the plug-in groove 19 on the assembly 6 during installation, which is convenient for installation and positioning.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-voltage DC / AC power swapping system, characterized in that, It includes a power supply module, a transformer module, a control module, and a cooling module, among which: The power supply module is used to transmit the AC power generated by the power station to the substation module; The power conversion module is used to convert the received AC power into DC power for transmission, and to convert DC power back into AC power at the receiving end; The control module is responsible for real-time monitoring of parameters and adjusting the operation of the converter and inverter as needed. The parameters include current, voltage, and power flow. The cooling module is used to process the refrigerant to keep the temperature of the power supply module and the transformer module within a suitable range to ensure normal operation. It can self-heat when the machine is stopped to prevent the refrigerant from forming a liquid and causing impact to the inside of the compressor when it is started. The compressor includes a housing (1) and an end cap (2) fixed to the front of the housing (1). The housing (1) includes an inner shell (101) and an outer shell (102). The outer shell (102) is fixed to the surface of the inner shell (101). A heating chamber (3) is formed between the inner shell (101) and the outer shell (102). A heating component for heating the inner shell (101) is provided inside the heating chamber (3) to vaporize the liquid refrigerant inside the housing (1) when the compressor stops running. The heating chamber (3) is also provided with a heat-insulating pad (4) for heat preservation, and the surface of the compressor is also provided with a temperature detection component for temperature detection, which is used to send a temperature signal to the controller so that the controller controls the heating component to perform adaptive heating. The heating assembly includes heaters (5) and a housing (6). A plurality of heaters (5) are evenly arrayed on the housing (6). A mounting plate (7) is fixedly connected to the surface of the housing (6). A mounting block (8) is fixedly connected to the surface of the housing (102). The mounting plate (7) and the mounting block (8) are fixedly connected by screws. The surface of the container (6) is movably connected to the surfaces of the outer shell (102) and the inner shell (101), and the surface of the heater (5) is movably connected to the surface of the inner shell (101); The surface of the heat insulation pad (4) is fixedly connected to a fixing plate (12), and a fixing member (13) is integrally formed on the surface of the fixing plate (12). The surface of the container (6) is provided with a fixing groove (14). The surface of the fixing member (13) is movably connected to the inner side wall of the fixing groove (14). The fixing member (13) is fixedly connected to the fixing groove (14) by fastening screws. The heat insulation pad (4) is fixedly connected to a guide plate (15) on the side away from the fixed plate (12). The surface of the guide plate (15) is integrally formed with a guide protrusion (16). The heating cavity (3) is provided with a guide groove (17). The surface of the guide protrusion (16) is movably connected to the inner wall of the guide groove (17). The surface of the fixing plate (12) is integrally formed with a plug-in component (18), and the surface of the container (6) is provided with a plug-in groove (19). The surface of the plug-in component (18) is movably connected to the inner wall of the plug-in groove (19).

2. The high-voltage DC-AC power swapping system according to claim 1, characterized in that: The substation module processes the AC power received from the power supply module in the following steps: S1. The received AC power is rectified into DC power using a rectifier and then transmitted to the transmission line. The control module detects the current and voltage in real time, and the cooling module dissipates heat during the rectifier process. S2. The DC power transmitted through the transmission line is inverted by the inverter to convert the DC power into the required AC power frequency and voltage, and then transmitted to the target power grid.

3. The high-voltage DC / AC power swapping system according to claim 2, characterized in that: The cooling module includes a compression unit, a heating unit, and a temperature detection unit, wherein: The compression unit is used to compress the refrigerant, the heating unit is used to heat the compressor when it stops running, and the temperature detection unit is used to detect the internal temperature of the compressor and the external ambient temperature, and send the data to the controller. The controller controls the heating power of the heating unit according to the external ambient temperature to keep the internal temperature of the compressor constant.

4. The high-voltage DC-AC power swapping system according to claim 1, characterized in that: The surface of the container (6) is provided with an installation groove (9), the surface of the heater (5) is movably connected to the inner wall of the installation groove (9), and the surface of the heater (5) is integrally formed with an installation protrusion (10), the surface of the installation protrusion (10) is movably connected to the inner wall of the installation groove (9). The mounting protrusion (10) is threaded with a screw (11), the screw (11) threaded through the mounting protrusion (10) and threadedly connected to the inner wall of the mounting groove (9).

5. The high-voltage DC-AC power swapping system according to claim 1, characterized in that: The temperature detection component includes an ambient temperature detector (20) and an internal temperature detector (21). The ambient temperature detector (20) is fixed to the surface of the outer shell (102), and the internal temperature detector (21) is fixedly connected to the surface of the end cap (2).

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