Phase change heat dissipation system for converter of wind generating set

Abstract

The invention discloses a phase change heat dissipation system for a converter of a wind generating set, and belongs to the technical field of wind power. An outlet of an external condensing device is connected to an inlet of a liquid separation device, and an outlet of the liquid separation device is connected with a phase change cold plate and an in-cabinet environment control heat exchanger in parallel; outlets of the phase change cold plate and the in-cabinet environment control heat exchanger are connected to an inlet of the liquid collecting device, an outlet of the liquid collecting device is connected to an inlet of the compression station, and an outlet of the compression station is connected to an inlet of the external condensing device; a medium flow channel is arranged in the phase change cold plate, and an IGBT is installed outside the phase change cold plate. According to the scheme, the phase change cold plates and the IGBTs are combined to dissipate heat for the IGBTs, the environmental control heat exchangers in the cabinets and the fans are combined to dissipate heat for all the electric control cabinets, heat is brought out of the wind generating set converter through gas-liquid two-phase change, the heat dissipation mode of the system is high in heat flux density, the temperature rise of the cold plates is low, the temperature difference between the IGBTs is small, the use amount of phase change media is small, and the heat dissipation efficiency is high. Heat dissipation is more efficient, the structure is more compact, and the installation space can be greatly saved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power, and in particular is a phase change heat dissipation system for a converter of a wind generator set. Background Art

[0002] Wind power generation has become an important part of the new energy field. The wind turbine inverter is an important component that adjusts the amplitude, frequency and phase of the output voltage of the wind turbine to the same as the power grid. The wind turbine inverter mainly includes a power module, a control module and a grid-connected module. The IGBT (Insulated Gate Bipolar Transistor) in the power module is the main heat-generating component, which generates a lot of heat when working. If the heat is not discharged in time, the high temperature will affect the service life of the core components inside the inverter, and will also increase the probability of inverter failure.

[0003] At present, there are two main ways to dissipate heat in wind turbine converters: water cooling and air cooling. However, with the increasing power of wind turbines, the heat dissipation requirements for wind turbine converters are getting higher and higher. Traditional heat dissipation methods are obviously unable to meet the heat dissipation requirements of high-power wind turbine converters. Therefore, the development of a more efficient heat dissipation system has become an urgent need for the development of wind turbine converters. Summary of the invention

[0004] The purpose of the present invention is to provide a phase change heat dissipation system for a wind turbine inverter to solve the problems raised in the above-mentioned background technology, aiming to improve the heat dissipation effect through the gas-liquid two-phase conversion of the phase change medium to meet the heat dissipation requirements of a high-power wind turbine inverter.

[0005] The present invention provides a phase change heat dissipation system for a wind turbine generator converter, comprising a compression station, an external condensing device and a heat exchange device, wherein the external condensing device is arranged at the top of a wind turbine generator tower, and a compression station and a converter cabinet are arranged in the wind turbine generator tower;

[0006] The heat exchange device is installed in the converter cabinet, and includes a phase change cold plate, an environmental control heat exchanger in the cabinet, a liquid separation device and a liquid collection device. The outlet of the external condensing device is connected to the inlet of the liquid separation device. The outlet of the liquid separation device is connected in parallel with the phase change cold plate and the environmental control heat exchanger in the cabinet. The outlets of the phase change cold plate and the environmental control heat exchanger in the cabinet are both connected to the inlet of the liquid collection device. The outlet of the liquid collection device is connected to the inlet of the compression station. The outlet of the compression station is connected to the inlet of the external condensing device.

[0007] The phase change cold plate is provided with a medium flow channel inside and an IGBT is installed outside.

[0008] As a further solution of the present invention: the external condensing device includes a plurality of condensing heat exchangers connected in parallel.

[0009] As a further solution of the present invention: a fan is provided in the converter cabinet, and the fan is installed in coordination with the environmental control heat exchanger in the cabinet.

[0010] As a further solution of the present invention: a drying filter and a sight glass are installed on the inlet side of the heat exchange device.

[0011] As a further solution of the present invention: the compression station includes a compressor and a liquid storage device, the inlet of the liquid storage device is connected to the outlet of the liquid collecting device, the outlet of the liquid storage device is connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of an external condensing device, valves are provided on the inlet and outlet sides of the compressor, the inlet side of the liquid storage device is provided with a valve, and the outlet side of the liquid storage device is provided with a pressure sensor and a temperature sensor.

[0012] As a further solution of the present invention: the outlet side of the external condensing device, the inlet side of the liquid separation device, and the outlet side of the compression station are all provided with a pressure sensor and a temperature sensor.

[0013] As a further solution of the present invention: an expansion valve and a valve are further provided on the inlet side of the liquid separation device, and a flow regulating device is provided on the outlet side of the liquid separation device.

[0014] As a further solution of the present invention: temperature sensors are provided in the phase change cold plate and the environmental control heat exchanger in the cabinet.

[0015] As a further solution of the present invention: the external condensation device is connected to the liquid separation device through a pipeline, and a liquid injection device is provided on the pipeline.

[0016] As a further solution of the present invention: it also includes a controller.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This solution adopts a combination of phase change cold plate and IGBT to dissipate heat for the IGBT, the core heat-generating component of the wind turbine converter, and brings heat out of the wind turbine converter through gas-liquid two-phase change. Compared with the existing heat dissipation system, the heat dissipation method of this system has high heat flux density, low cold plate temperature rise, small temperature difference between IGBTs, small amount of phase change medium, more efficient heat dissipation, more compact structure, and can greatly save installation space.

[0019] 2. The external condensation system is installed on the top of the wind turbine tower and uses natural wind for cooling. It does not require the installation of fans or other external power, greatly reducing the energy consumption of the cooling system.

[0020] 3. A flow regulating device is installed at the outlet of the liquid separation device, which can adjust the flow of each branch according to the different heat dissipation requirements of the IGBT and the electric control cabinet inside the wind turbine converter, thereby better meeting the heat dissipation requirements of the wind turbine converter under different working conditions.

[0021] 4. The heat exchanger and fan in the cabinet are combined to dissipate heat for each electric control cabinet of the wind turbine converter, so as to meet the heat dissipation requirements in the converter cabinet of the wind turbine and ensure that the converter of the wind turbine operates within the appropriate temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar or repeated elements are not repeatedly marked in the drawings. The elements or parts in the drawings are not necessarily drawn according to the actual scale.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the system principle in an embodiment of the present invention;

[0025] Figure 3 It is a schematic cross-sectional view of the structure of a phase change cold plate combined with an IGBT in an embodiment of the present invention.

[0026] In the figure: 1. compression station; 1-1. compressor; 1-2. liquid storage device; 2. external condensing device; 2-1. condensing heat exchanger; 3. heat exchange device; 3-1. phase change cold plate; 3-1-1. medium flow channel; 3-2. environmental control heat exchanger in the cabinet; 3-3. fan; 3-4. expansion valve; 3-5. flow regulating device; 3-6. liquid separation device; 3-7. liquid collecting device; 4. controller; 5. wind turbine tower; 6. converter cabinet; 7. pipeline; 8. pressure sensor; 9. temperature sensor; 10. IGBT; 11. valve; 12. liquid injection device; 13. drying filter; 14. sight glass. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0029] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0031] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0033] See also Figure 1-Figure 3As shown, this embodiment provides a phase change heat dissipation system for a wind turbine converter, including a compressor station 1, an external condensing device 2 and a heat exchanger 3, wherein the external condensing device 2 is arranged at the top of a wind turbine tower 5, and a compressor station 1 and a converter cabinet 6 are arranged in the wind turbine tower 5. The heat exchanger 3 is installed in the converter cabinet 6, and includes a phase change cold plate 3-1, an environmental control heat exchanger 3-2 in the cabinet, a liquid separation device 3-6 and a liquid collection device 3-7, wherein the outlet of the external condensing device 2 is connected to the inlet of the liquid separation device 3-6, and the outlet of the liquid separation device 3-6 is connected in parallel with the phase change cold plate 3-1 and the environmental control heat exchanger 3-2 in the cabinet, and the outlets of the phase change cold plate 3-1 and the environmental control heat exchanger 3-2 in the cabinet are both connected to the inlet of the liquid collection device 3-7, and the outlet of the liquid collection device 3-7 is connected to the inlet of the compressor station 1, and the outlet of the compressor station 1 is connected to the inlet of the external condensing device 2, so that the phase change medium can circulate in the heat dissipation system. The phase change cold plate 3-1 is provided with a medium flow channel 3-1-1 inside and an IGBT10 is installed outside. When the phase change medium flows through the medium flow channel 3-1-1 inside the phase change cold plate 3-1, it absorbs the heat generated by the IGBT10. The phase change cold plate 3-1 utilizes the property of a substance absorbing or releasing a large amount of heat during phase change to achieve efficient heat dissipation. This solution adopts a combination of the phase change cold plate 3-1 and the IGBT10 to dissipate heat for the IGBT, the core heat generating component of the wind turbine converter, and takes the heat out of the wind turbine converter through the gas-liquid two-phase change. Compared with the existing heat dissipation system, the heat dissipation method of this system has high heat flux density, low cold plate temperature rise, small temperature difference between each IGBT, less phase change medium, more efficient heat dissipation, more compact structure, and can greatly save installation space. In addition, the phase change cold plate 3-1 does not require additional energy consumption during the heat dissipation process, and does not generate noise and vibration, which meets the requirements of energy saving and environmental protection. Since the heat generated by the wind turbine inverter is proportional to the volume of natural wind, the greater the wind volume, the greater the power generation of the wind turbine. At the same time, the greater the heat generated by the wind turbine inverter, the greater the heat dissipation of the heat dissipation system. Therefore, the external condensing device 2 is installed on the top of the wind turbine tower 5 to use natural wind for cooling. When the heat dissipation is greater, the natural wind volume is also greater. Therefore, there is no need for a heat dissipation fan and external power, which can greatly reduce the energy consumption of the heat dissipation system.

[0034] For further information, see Figure 2 As shown, the outlet of the liquid separation device 3-6 is connected in parallel with a plurality of phase change cold plates 3-1 and a plurality of in-cabinet environmental control heat exchangers 3-2. The outlets of the phase change cold plates 3-1 and the in-cabinet environmental control heat exchangers 3-2 are both connected to the inlet of the liquid collecting device 3-7. The number of phase change cold plates 3-1 can refer to the number of IGBT10. The in-cabinet environmental control heat exchanger 3-2 is mainly used for dissipating heat for the electric control cabinet. The number of in-cabinet environmental control heat exchangers 3-2 can refer to the heat dissipation requirements in the converter cabinet 6.

[0035] For further information, see Figure 3 As shown, the two opposite walls of the phase change cold plate 3-1 are provided with medium flow channels 3-1-1, and the outer surface of one of the two opposite walls is used as the heating element installation surface. The IGBT10, as the main heating element of the wind turbine converter, is installed on the heating element installation surface of the phase change cold plate 3-1, which is very convenient for construction, and increases the contact area between the IGBT10 and the wall of the medium flow channel 3-1-1. The medium flow channels 3-1-1 on the two opposite walls are connected through multiple medium flow channels 3-1-1. The inlet and outlet of the medium flow channel 3-1-1 are set at both ends of the phase change cold plate 3-1, so that the phase change medium can flow from one end of the phase change cold plate 3-1 to the other end, and fully absorb the heat generated by the IGBT10. After the phase change medium absorbs the heat generated by the IGBT10, part or all of the phase change medium changes from liquid phase to gas phase.

[0036] In some embodiments, see Figure 2 As shown, the external condensing device 2 includes a plurality of parallel condensing heat exchangers 2-1, in which the phase change medium completes the gas-liquid two-phase conversion from the gas phase to the liquid phase, thereby exchanging the heat generated by the wind turbine converter. The number of condensing heat exchangers 2-1 is adjusted according to the heat dissipation power required by the wind turbine converter.

[0037] In some embodiments, see Figure 2 As shown, the converter cabinet 6 is provided with a fan 3-3, and the fan 3-3 is installed in conjunction with the cabinet environment control heat exchanger 3-2. The cabinet environment control heat exchanger 3-2 is installed in conjunction with the fan 3-3 to send cold air into the converter cabinet 6 to reduce the cabinet temperature, meet the heat dissipation requirements of the wind turbine converter cabinet, and ensure that the wind turbine converter operates within a suitable temperature range. The fan 3-3 can be an induced draft fan or a blower.

[0038] In some embodiments, see Figure 2 As shown, a drying filter 13 for absorbing moisture in the phase change medium and a sight glass 14 for observing the state of the phase change medium in the heat dissipation system are installed on the inlet side of the heat exchange device 3.

[0039] In some embodiments, see Figure 2As shown, the compression station 1 includes a compressor 1-1 and a liquid storage device 1-2. The inlet of the liquid storage device 1-2 is connected to the outlet of the liquid collecting device 3-7, and the outlet of the liquid storage device 1-2 is connected to the inlet of the compressor 1-1. The outlet of the compressor 1-1 is connected to the inlet of the external condensing device 2. The phase change medium is separated into gas and liquid when flowing through the liquid storage device 1-2. The gas phase change medium in the liquid storage device 1-2 is compressed by the compressor 1-1 and changes from low pressure to high pressure, so that the phase change medium obtains the power required for circulation in the entire heat dissipation system. The inlet and outlet sides of the compressor 1-1 are both provided with valves 11. The inlet side of the liquid storage device 1-2 is provided with a valve 11, which is convenient for replacing the heat exchange device 3 and the external condensing device 2. The outlet side of the liquid storage device 1-2 is provided with a pressure sensor 8 and a temperature sensor 9 for detecting the pressure and temperature of the gas entering the compressor 1-1.

[0040] For further information, see Figure 2 As shown, a pressure sensor 8 and a temperature sensor 9 are provided on the outlet side of the external condensing device 2, the inlet side of the liquid separation device 3-6, and the outlet side of the compressor 1-1.

[0041] For further information, see Figure 2 As shown, the inlet side of the liquid separation device 3 - 6 is also provided with an expansion valve 3 - 4 and a valve 11 .

[0042] For further information, see Figure 2 As shown, a flow regulating device 3-5 is provided on the outlet side of the liquid separation device 3-6. Since a plurality of phase change cold plates 3-1 and a plurality of in-cabinet environmental control heat exchangers 3-2 are connected in parallel to the outlet of the liquid separation device 3-6, it means that a plurality of branches are provided on the outlet side of the liquid separation device 3-6 for connecting the phase change cold plates 3-1 or the in-cabinet environmental control heat exchangers 3-2. Each branch is provided with a flow regulating device 3-5 for regulating the flow of the phase change medium in each phase change cold plate 3-1 and the in-cabinet environmental control heat exchanger 3-2.

[0043] For further information, see Figure 2 As shown, temperature sensors 9 are provided in the phase change cold plate 3 - 1 and the in-cabinet environmental control heat exchanger 3 - 2 .

[0044] It should be noted that: the phase change medium flow channel between the components involved in this solution can adopt pipeline 7, and the components that need to be connected are connected through pipeline 7, so that the phase change medium can circulate in the heat dissipation system. Exemplarily, the external condensing device 2 is connected to the liquid separation device 3-6 through pipeline 7, and a liquid injection device 12 is provided on the pipeline 7 for adding phase change medium to the heat dissipation system. The pressure sensor 8, drying filter 13, sight glass 14, expansion valve 3-4, valve 11, flow regulating device 3-5 and part of the temperature sensor 9 mentioned above are all installed on the pipeline 7 at the corresponding position.

[0045] In some embodiments, see Figure 1 As shown, a controller 4 is also included to realize automatic control of the heat dissipation system.

[0046] It should be pointed out that the compressor 1-1, fan 3-3, expansion valve 3-4, flow control device 3-5, valve 11, pressure sensor 8, temperature sensor 9, injection device 12 and other components in this scheme can be controlled individually and manually adjusted, or can be associated with the controller 4 to achieve automatic control through the controller 4.

[0047] The controller 4 automatically controls the opening of the flow regulating device 3 - 5 and the power of the compressor 1 - 1 by reading the values ​​of each temperature sensor 9 and the pressure sensor 8 to ensure that the wind turbine converter operates within a suitable temperature range.

[0048] When the controller 4 detects that the value of the temperature sensor 9 installed in the phase change cold plate 3-1 and the internal environmental control heat exchanger 3-2 of the cabinet exceeds the set temperature value, the system will automatically start. At this time, the compressor 1-1 will suck the phase change medium in the gas phase in the liquid storage device 1-2 for compression, so that the gas phase phase change medium changes from low pressure to high pressure and is transported to the external condensing device 2 installed on the top of the wind turbine tower 5 for condensation. In the condensing heat exchanger 2-1 of the external condensing device 2, the phase change medium is converted from gas phase to liquid phase, and heat is transferred to the external condensing device 2 through the gas-liquid two-phase conversion. The external condensing device 2 is cooled by natural wind. The liquid phase phase change medium condensed by the external condensing device 2 flows to the liquid separation device 3-6 through the pipeline 7. At this time, the controller 4 will dynamically control the opening of the expansion valve 3-4 according to the values ​​of each temperature sensor 9 and the pressure sensor 8 to adjust the flow and pressure of the phase change medium in the pipeline 7. At the same time, the controller 4 adjusts the flow regulating devices 3-5 installed at each outlet of the liquid separation device 3-6 according to the temperature of each phase change cold plate 3-1 and the temperature in the environmental control heat exchanger 3-2 in each cabinet to automatically match the flow of the phase change medium in each branch, so as to meet various operating conditions from low power to full power of the wind turbine.

[0049] The liquid phase change medium that is separated by the liquid separation device 3-6 and is transferred to the phase change cold plate 3-1 absorbs the heat generated by the main heating element IGBT10 of the wind turbine converter through the gas-liquid two-phase conversion when flowing through the medium flow channel 3-1-1 inside the phase change cold plate 3-1. At this time, the liquid phase change medium changes to the gas phase. Since the phase change cold plate 3-1 provided with the medium flow channel 3-1-1 is used to dissipate the heat of the IGBT10, the heat flux density of the heat dissipation is high, the temperature rise of the phase change cold plate 3-1 is low, the temperature difference between each IGBT10 is small, and the energy consumption is lower. The liquid phase change medium that is separated by the liquid separation device 3-6 and transferred to the environmental control heat exchanger 3-2 in the cabinet is converted into gas-liquid two-phase under the action of the fan 3-3, and the cold it carries is sent into the converter cabinet 6, ensuring that the temperature in the converter cabinet 6 reaches the set temperature. Most of the gas phase phase change medium and the liquid phase phase change medium that has not been completely converted from gas to liquid flowing through each phase change cold plate 3-1 and the environmental control heat exchanger 3-2 in the cabinet flow to the liquid collecting device 3-7. The phase change medium is collected by the liquid collecting device 3-7 and flows to the liquid storage device 1-2 through the pipeline 7. The gas phase and liquid phase phase change medium in the liquid storage device 1-2 are separated into gas and liquid. After the gas-liquid separation is completed, the gas phase phase change medium enters the compressor 1-1 again for circulation. The above process is for the heat dissipation of the wind turbine inverter.

[0050] When the cooling system is not working, most of the liquid phase change medium is stored in the liquid storage device 1-2. When it is necessary to replace the heat exchange device 3 or the external condensing device 2, it is only necessary to close the inlet and outlet valves 11 of the compression station 1 for replacement. After the replacement is completed, only a small amount of phase change medium needs to be added through the liquid injection device 12, which greatly reduces the amount of phase change medium used.

[0051] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A phase change heat dissipation system for a wind turbine converter, characterized in that: It includes a compression station, an external condensing device and a heat exchange device, wherein the external condensing device is arranged on the top of the wind turbine tower, and the wind turbine tower is provided with a compression station and a converter cabinet; The heat exchange device is installed in the converter cabinet, and includes a phase change cold plate, an environmental control heat exchanger in the cabinet, a liquid separation device and a liquid collection device. The outlet of the external condensing device is connected to the inlet of the liquid separation device. The outlet of the liquid separation device is connected in parallel with the phase change cold plate and the environmental control heat exchanger in the cabinet. The outlets of the phase change cold plate and the environmental control heat exchanger in the cabinet are both connected to the inlet of the liquid collection device. The outlet of the liquid collection device is connected to the inlet of the compression station. The outlet of the compression station is connected to the inlet of the external condensing device. The phase change cold plate is provided with a medium flow channel inside and an IGBT is installed outside.

2. A phase change heat dissipation system for a wind turbine converter according to claim 1, characterized in that: The external condensing device includes a plurality of condensing heat exchangers connected in parallel.

3. A phase change heat dissipation system for a wind turbine converter according to claim 1, characterized in that: A fan is provided in the converter cabinet, and the fan is installed in cooperation with the environmental control heat exchanger in the cabinet.

4. A phase change heat dissipation system for a wind turbine generator converter according to claim 1, characterized in that: A drying filter and a sight glass are installed on the inlet side of the heat exchange device.

5. The phase change heat dissipation system for a wind turbine generator converter according to claim 1, characterized in that: The compression station includes a compressor and a liquid storage device, the inlet of the liquid storage device is connected to the outlet of the liquid collecting device, the outlet of the liquid storage device is connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of an external condensing device, valves are provided on the inlet and outlet sides of the compressor, the inlet side of the liquid storage device is provided with a valve, and the outlet side of the liquid storage device is provided with a pressure sensor and a temperature sensor.

6. A phase change heat dissipation system for a wind turbine generator converter according to claim 1, characterized in that: The outlet side of the external condensing device, the inlet side of the liquid separation device, and the outlet side of the compression station are all provided with a pressure sensor and a temperature sensor.

7. A phase change heat dissipation system for a wind turbine converter according to claim 1, characterized in that: An expansion valve and a valve are also provided on the inlet side of the liquid separation device, and a flow regulating device is provided on the outlet side of the liquid separation device.

8. The phase change heat dissipation system for a wind turbine converter according to claim 1, characterized in that: The phase change cold plate and the environmental control heat exchanger in the cabinet are provided with temperature sensors.

9. The phase change heat dissipation system for a wind turbine converter according to claim 1, characterized in that: The external condensing device is connected to the liquid separation device through a pipeline, and a liquid injection device is provided on the pipeline.

10. A phase change heat dissipation system for a wind turbine converter according to any one of claims 1 to 9, characterized in that: A controller is also included.

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