Converter and wind generating set

Abstract

The utility model relates to a current transformer and a wind generating set, the current transformer comprises a power module, the power module comprises a packaging shell, an IGBT module and a phase-change heat transfer medium, the packaging shell is provided with a sealing cavity, the IGBT module and the phase-change heat transfer medium are both arranged in the sealing cavity, and an air cavity is arranged between the liquid level of the phase-change heat transfer medium and the shell along a first direction; the IGBT module is immersed in the phase-change heat transfer medium, and the phase-change heat transfer medium can absorb heat of the IGBT module and change the heat into a gas state; the condensation assembly is arranged outside the power module and comprises a heat exchanger, a first pipe set and a second pipe set, the first pipe set is used for guiding a gaseous phase-change heat exchange medium to the heat exchanger, and the heat exchanger is used for exchanging heat with the gaseous phase-change heat exchange medium and enabling the gaseous phase-change heat exchange medium to be in a liquid state; the second pipe set is used for guiding the phase-change heat exchange medium in the heat exchanger to return to the sealing cavity, wherein the phase-change heat exchange medium returns to the liquid state. According to the utility model, the heat dissipation requirement of the IGBT module can be ensured, and the self reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flow regulator, especially to a flow regulator and a wind turbine generator system. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, wind power has developed rapidly as an important form of renewable energy utilization. In a wind turbine generator system, the flow regulator plays a key role and is one of the core devices to ensure that the power generated by the wind turbine is successfully connected to the power grid. The Insulate-Gate Bipolar Transistor (IGBT) module is a key component of the flow regulator.

[0003] The IGBT module plays a key role in the flow regulator of the wind turbine generator system. In the rectification stage, it accurately converts the AC power output by the wind turbine into DC power, and in the inverter stage, it efficiently converts the DC power into AC power that can be stably adapted to the power grid. This ensures that the wind power system can stably and continuously feed power to the power grid, and accurately regulates the power generation to make the system operate in different wind speed conditions and maximize the power generation efficiency.

[0004] However, when performing these complex and high-intensity power conversion tasks, the IGBT module inevitably generates a large amount of heat due to the rapid switching action of the internal power devices and the passage of large currents. The flow regulator in the related art is difficult to quickly remove the newly generated large amount of heat, causing the working temperature of the IGBT module to far exceed the safety threshold, affecting the reliability of the flow regulator. SUMMARY

[0005] The utility model embodiment provides a kind of flow regulator and wind turbine generator system, and flow regulator can guarantee the heat dissipation demand of IGBT module, improve own reliability.

[0006] In one aspect, the utility model discloses a kind of current transformer, comprising: power module, including package shell, IGBT module and phase change heat transfer medium, package shell has sealed chamber, IGBT module and phase change heat transfer medium are all set in sealed chamber, along first direction, phase change heat transfer medium's liquid level and package shell between gas cavity, IGBT module is immersed in phase change heat transfer medium, phase change heat transfer medium can absorb the heat of IGBT module and phase change into gaseous state;Condensing component is set outside power module, and condensing component includes heat exchanger, first pipe group, second pipe group, first pipe group is communicated with the inlet of heat exchanger and gas cavity, second pipe group is communicated with the outlet of heat exchanger and sealed chamber, first pipe group is used to guide gaseous phase change heat transfer medium to heat exchanger, heat exchanger is used to exchange heat with gaseous phase change heat transfer medium and make it phase change and restore to liquid state, second pipe group is used to guide phase change heat transfer medium that restores liquid state in heat exchanger to return to sealed chamber, to circulate cooling IGBT module.

[0007] According to an aspect of the utility model embodiment, the power module further includes a support at least partially immersed in the phase change heat transfer medium, the support is connected with the package shell, and the IGBT module is arranged on the support.

[0008] According to an aspect of the utility model embodiment, the power module includes a plurality of supports, the plurality of supports are arranged at intervals, and each support is provided with the IGBT module.

[0009] According to an aspect of the utility model embodiment, the plurality of supports are arranged at intervals in the second direction, each support is provided with more than two IGBT modules on both sides in the second direction, the IGBT modules on the same side of the support are arranged at intervals along the first direction, and the second direction intersects the first direction.

[0010] According to an aspect of the utility model embodiment, the plurality of supports are arranged at intervals in the first direction, each support is provided with more than two IGBT modules on a side facing the gas cavity, and the IGBT modules on the same support are arranged at intervals along the second direction; along the first direction, the IGBT modules on the adjacent two supports are arranged at intervals, and the IGBT modules on one of the adjacent two supports closer to the gas cavity are provided with a gap for the IGBT modules on the other support.

[0011] According to an aspect of the utility model embodiment, the power module includes a plurality of supports, the first pipe group includes a first main pipe and a plurality of first branch pipes, the first main pipe is communicated with the inlet, one end of each first branch pipe is communicated with the first main pipe and the other end is communicated with the gas cavity of one of the power modules; the second pipe group includes a second main pipe and a plurality of second branch pipes, the second main pipe is communicated with the outlet, one end of each second branch pipe is communicated with the second main pipe and the other end is communicated with the sealed chamber of one of the power modules.

[0012] According to an aspect of the embodiment of the present application, the power module further comprises a liquid level detector, the liquid level detector is arranged in the sealed chamber, and the liquid level detector is configured to detect the liquid level of the phase-change heat transfer medium.

[0013] According to an aspect of the embodiment of the present application, the packaging shell is provided with a liquid discharge port in communication with the sealed chamber, and the first control valve is arranged at the liquid discharge port.

[0014] According to an aspect of the embodiment of the present application, the condensing assembly further comprises a driving pump, the driving pump is arranged in the second pipe group, and the driving pump is used to provide operating power for the phase-change heat transfer medium in liquid state.

[0015] According to an aspect of the embodiment of the present application, the converter further comprises a capacitor bank electrically connected with the IGBT module, wherein: the capacitor bank is arranged in the air cavity of the power module and connected with the packaging shell; or the capacitor bank is arranged outside the power module and fixedly arranged with the packaging shell.

[0016] According to an aspect of the embodiment of the present application, the converter further comprises a cabinet body and a reactor, the reactor, the power module and the capacitor bank are arranged in the cabinet body, the heat exchanger is arranged on the top wall of the cabinet body, and the reactor is arranged outside the packaging shell and electrically connected with the IGBT module.

[0017] According to an aspect of the embodiment of the present application, the power module further comprises a heater and a temperature detector, the temperature detector is configured to detect the temperature of at least one of the phase-change heat transfer medium and the IGBT module, and the heater is configured to heat the phase-change heat transfer medium in the sealed chamber.

[0018] According to an aspect of the embodiment of the present application, the temperature detector comprises a first temperature sensor and a second temperature sensor, the first temperature sensor is configured to detect the temperature of the phase-change heat transfer medium, the second temperature sensor is configured to detect the temperature of the IGBT module, the converter further comprises a controller, the controller is connected with the heat exchanger, and the controller controls the heat exchange rate of the heat exchanger according to the temperature of the phase-change heat transfer medium and the temperature of the IGBT module.

[0019] In another aspect, the embodiment of the present application provides a wind turbine generator, which comprises the converter.

[0020] According to the present invention, a converter and a wind turbine generator set are provided. The converter includes a power module and a condenser assembly. The power module includes a housing, an IGBT module, and a phase change heat transfer medium. Both the IGBT module and the phase change heat transfer medium are disposed in a sealed chamber, and the IGBT module is immersed in the phase change heat transfer medium. When the converter operates, its IGBT module generates heat, and the phase change heat transfer medium can quickly absorb the heat generated by the IGBT module and undergo a phase change, changing from a liquid state to a gaseous state. Since the first pipe group is connected to the inlet and gas chamber of the heat exchanger, and the second pipe group is connected to the outlet and sealed chamber of the heat exchanger, the phase change heat transfer medium, after absorbing heat and becoming gaseous, can be guided to the heat exchanger through the first pipe group and exchange heat with the heat exchanger. The gaseous phase change heat transfer medium returns to a liquid state, and then the second pipe group guides the phase change heat transfer medium, which has returned to a liquid state in the heat exchanger, back to the sealed chamber to circulate and cool the IGBT module. By utilizing the phase change heat transfer medium to quickly absorb heat and exchange heat with the heat exchanger, the converter can ensure the heat dissipation requirements of the IGBT module and improve its own reliability. Attached Figure Description

[0021] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a wind turbine generator set according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of a converter according to one embodiment of the present invention;

[0024] Figure 3 This is a partial structural schematic diagram of a converter according to an embodiment of the present invention;

[0025] Figure 4 This is a partial structural schematic diagram of a converter according to another embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the overall structure of a converter according to another embodiment of the present invention;

[0027] Figure 6 This is a partial structural schematic diagram of a converter according to another embodiment of the present invention;

[0028] Figure 7 This is a partial structural schematic diagram of a converter according to another embodiment of the present invention;

[0029] Figure 8 This is a partial structural schematic diagram of a converter according to another embodiment of the present invention;

[0030] Figure 9 This is a partial structural schematic diagram of a converter according to another embodiment of the present invention.

[0031] wherein:

[0032] 100, converter; 200, tower; 300, nacelle; 400, impeller; 401, hub; 402, blade;

[0033] 10, power module;

[0034] 11, package housing; 111, air cavity;

[0035] 12, IGBT module;

[0036] 13, phase change heat transfer medium;

[0037] 14, liquid level detector; 15, liquid discharge port; 16, first control valve; 17, heater; 18, temperature detector; 181, first temperature sensor; 182, second temperature sensor; 19, pressure detector;

[0038] 20, bracket; 21, clearance hole;

[0039] 30, condensing assembly; 31, heat exchanger; 32, first pipe group; 321, first main pipe; 322, first branch pipe; 33, second pipe group; 331, second main pipe; 332, second branch pipe; 34, driving pump; 35, liquid storage tank;

[0040] 40, capacitor cell; 50, reactor; 60, cabinet body; 70, exhaust valve;

[0041] X, first direction; Y, second direction.

[0042] In the drawings, the same components have the same reference numerals, even across different drawings. The drawings have not necessarily been drawn to scale. DETAILED DESCRIPTION

[0043] Features and exemplary embodiments of each aspect of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely meant to provide a better understanding of the present application. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid obscuring the present application; and, for clarity, the dimensions of some structures can be exaggerated. Furthermore, features described hereinafter can be combined in any suitable manner in one or more embodiments.

[0044] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the converter and the wind turbine generator set of the utility model. In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0045] Please refer to Figure 1 An embodiment of the present application provides a wind turbine generator set, comprising a tower 200, a nacelle 300, a generator, a blade wheel 400 and a converter 100. The tower 200 is connected to the fan foundation, the tower 200 is spliced by a plurality of tower drum segments, the nacelle 300 is arranged at the top end of the tower 200, and the generator is arranged in the nacelle 300. In some examples, the generator can be located outside the nacelle 300, of course, in some examples, the generator can also be located inside the nacelle 300. The blade wheel 400 comprises blades 402 and a hub 401, a plurality of blades 402 are connected to the hub 401, when wind acts on the blades 402, the entire blade wheel 400 and the rotor of the generator are driven to rotate relative to the stator, so as to convert wind energy into electric energy.

[0046] The converter 100 is arranged in the nacelle 300, in the wind turbine generator set, the converter 100 plays a key role, is one of the core equipment for ensuring that the electric energy generated by the wind turbine is smoothly connected to the power grid, and the Insulate-Gate Bipolar Transistor (IGBT) module is a key component of the converter 100. As a high-power device, the IGBT generates a large amount of heat when working, at present, the heat dissipation modes of the IGBT module mainly include forced air cooling and cold plate water cooling technologies, with the development of large-scale wind turbine generator sets, the total power of the power module required is also increasing, and the heat generation is also increasing. The heat dissipation capacity of the air cooling and water cooling modes is limited, so that the working temperature of the IGBT module is relatively high, so that the working temperature of the IGBT module far exceeds the safety threshold, which affects the reliability of the converter.

[0047] Based on this, an embodiment of the present application further provides a new converter 100, which can be used in the wind turbine generator set provided by the above-mentioned embodiments and as a component of the wind turbine generator set, of course, it can also be produced and sold as an independent product.

[0048] Please participate Figure 2 , Figure 3As shown, the converter 100 provided by an embodiment of the present application includes a power module 10 and a condensing assembly 30. The power module 10 includes an encapsulation shell 11, an IGBT module 12, and a phase-change heat transfer medium 13. The encapsulation shell 11 has a sealed cavity, and the IGBT module 12 and the phase-change heat transfer medium 13 are both arranged in the sealed cavity. In a first direction X, the phase-change heat transfer medium 13 has an air cavity 111 between a liquid surface and the encapsulation shell 11. The IGBT module 12 is immersed in the phase-change heat transfer medium 13, and the phase-change heat transfer medium 13 can absorb heat of the IGBT module 12 and change phase into a gaseous state. The condensing assembly 30 is arranged outside the power module 10. The condensing assembly 30 includes a heat exchanger 31, a first pipe group 32, and a second pipe group 33. The first pipe group 32 is in communication with the air cavity 111 and an inlet of the heat exchanger 31, and the second pipe group 33 is in communication with an outlet of the heat exchanger 31 and the sealed cavity. The first pipe group 32 is used to guide the phase-change heat transfer medium 13 in the gaseous state to the heat exchanger 31. The heat exchanger 31 is used to exchange heat with the phase-change heat transfer medium 13 in the gaseous state and make it change phase to return to a liquid state. The second pipe group 33 is used to guide the phase-change heat transfer medium 13 in the liquid state in the heat exchanger 31 back to the sealed cavity to circulate and cool the IGBT module 12.

[0049] The encapsulation shell 11 can have a polygonal cabinet structure. The number of IGBT modules 12 can be one or multiple. When the number of IGBT modules 12 is multiple, the multiple IGBT modules 12 can be arranged at intervals.

[0050] The phase-change heat transfer medium 13 is an insulating phase-change heat transfer medium 13. Optionally, the phase-change heat transfer medium 13 can include a fluorinated liquid, which has advantages such as good insulation effect, low boiling point, and fast heat absorption efficiency. For example, the fluorinated liquid FC-72, FC-770, and the like can be selected.

[0051] The IGBT module 12 can be directly connected to a side wall of the encapsulation shell 11 in the sealed cavity. Of course, other support structures can also be arranged in the sealed cavity, so that the IGBT module 12 can be indirectly connected and supported on the side wall of the encapsulation shell 11 through the support structures.

[0052] The first direction X can be a height direction of the encapsulation shell 11. The IGBT module 12 can be partially or entirely immersed in the phase-change heat transfer medium 13. In an embodiment of the present application, the IGBT module 12 can be entirely immersed in the phase-change heat transfer medium 13.

[0053] The sealed cavity can be divided into two parts along the first direction X, one part filled with the phase-change heat transfer medium 13, and the other part used to form the air cavity 111.

[0054] The heat exchanger 31 of the condensing assembly 30 can be arranged on the encapsulation shell 11. Of course, the heat exchanger 31 can also be arranged at intervals from the encapsulation shell 11.

[0055] The heat exchanger 31 can adopt air cooling or liquid cooling heat exchange form. In the heat exchanger 31, the phase change cooling medium changes from liquid to gas state and exchanges heat with the cooling gas (or liquid).

[0056] The converter 100 provided by the embodiment of the present application can quickly absorb the heat generated by the IGBT module 12 and change phase from liquid to gas state. The first pipe group 32 is in communication with the inlet of the heat exchanger 31 and the gas cavity 111, and the second pipe group 33 is in communication with the outlet of the heat exchanger 31 and the sealed cavity. The phase change cooling medium 13 changes from liquid to gas state and enters the heat exchanger 31 through the first pipe group 32 to exchange heat with the heat exchanger 31, so that the phase change cooling medium 13 changes from gas state to liquid state. The phase change cooling medium 13 in the heat exchanger 31 changes from liquid state to gas state and is guided back to the sealed cavity through the second pipe group 33 to cool the IGBT module 12. Therefore, the converter provided by the embodiment of the present application can quickly absorb heat and exchange heat with the heat exchanger 31 by using the phase change cooling medium 13, so as to guarantee the heat dissipation requirement of the IGBT module 12 and improve the reliability of the converter.

[0057] In some optional embodiments, the converter 100 provided by the embodiment of the present application further includes a support 20 at least partially immersed in the phase change cooling medium 13. The support 20 is connected with the packaging shell 11, and the IGBT module 12 is arranged on the support 20.

[0058] The support 20 includes but is not limited to a plate structure, a frame structure, etc.

[0059] The support 20 and the IGBT module 12 can be connected in a detachable manner.

[0060] The support 20 arranged in the sealed cavity can be one or multiple. When the support 20 is multiple, the multiple supports 20 can be arranged at intervals, and the IGBT module 12 can be connected to each support 20.

[0061] The converter 100 provided by the embodiment of the present application can provide support for the IGBT module 12 by arranging the support 20 immersed in the phase change cooling medium 13, which can facilitate the installation of the IGBT module 12 and increase the number of the IGBT module 12. In addition, the phase change cooling medium 13 can be fully utilized to increase the heat exchange area between the phase change cooling medium 13 and the IGBT module 12 and improve the heat exchange efficiency.

[0062] In some alternative embodiments, the converter 100 provided by one embodiment of the present application has a plurality of supports 20 included in the power module 10, and the plurality of supports 20 are arranged at intervals.

[0063] The number of supports 20 can be two, three or more.

[0064] The plurality of supports 20 can be arranged side by side in the same direction.

[0065] One or more IGBT modules 12 can be arranged on each support 20.

[0066] The converter 100 provided by one embodiment of the present application has a plurality of supports 20 included in the power module 10, so that when the number of IGBT modules 12 included in the power module 10 is large, the installation requirements of the plurality of IGBT modules 12 can be met, and the uniformity of the contact and heat exchange between the IGBT modules 12 and the phase-change heat exchange medium 13 can be ensured.

[0067] In some alternative embodiments, the converter 100 provided by one embodiment of the present application has a plurality of supports 20 arranged at intervals in the second direction Y, two or more IGBT modules 12 are arranged on each support 20 at both sides of the support 20 in the second direction Y, the IGBT modules 12 on the same side of the support 20 in the second direction Y are arranged at intervals in the first direction X, and the second direction Y intersects the first direction X.

[0068] The second direction Y can be the width direction of the packaging shell 11.

[0069] Alternatively, the second direction Y and the first direction X can be arranged perpendicular to each other.

[0070] The number of IGBT modules 12 arranged on each support 20 at both sides of the support 20 in the second direction Y can be two, three or more.

[0071] The converter 100 provided by one embodiment of the present application has the above arrangement of the plurality of supports 20, which can not interfere with each other, so that the gas generated after the phase-change heat exchange medium 13 absorbs the heat of the IGBT modules 12 and boils and changes into a gaseous state can be smoothly moved to the gas cavity 111, so as to be absorbed by the condensing assembly 30 and returned to the liquid state after being cooled and then returned to the sealed chamber.

[0072] In some alternative embodiments, the IGBT modules 12 arranged on both sides of the same support 20 can be symmetrically arranged.

[0073] It can be understood that when the number of the supports 20 is multiple, the arrangement of the supports 20 is only one optional embodiment.

[0074] Please refer to Figure 4 In some embodiments, the plurality of supports 20 can also be arranged at intervals in the first direction X, and each support 20 is provided with two or more IGBT modules 12 on the side facing the air cavity 111, and the IGBT modules 12 on the same support 20 are arranged at intervals along the second direction Y. Along the first direction X, the IGBT modules 12 on the adjacent two supports 20 are arranged at intervals, and the IGBT modules 12 on one of the adjacent two supports 20 which is closer to the air cavity 111 are provided with a gap hole 21 corresponding to the IGBT modules 12 on the other support 20.

[0075] The gap hole 21 can be arranged through the support 20 along the first direction X.

[0076] The converter 100 provided by one embodiment of the present application can also meet the installation and heat exchange requirements of the plurality of IGBT modules 12 through the above arrangement, and the arrangement of the gap hole 21 is conducive to ensuring that the phase change cooling medium which absorbs heat and changes into a gaseous state can pass through the gap hole 21 smoothly and enter the air cavity 111, so as to return to the sealed cavity after absorbing heat by the condensing assembly 30 and recovering to a liquid state.

[0077] Optionally, when the number of the power modules included in a single power module 10 is sufficient, the converter 100 provided by one embodiment of the present application can include one power module 10, of course, which is one optional embodiment.

[0078] Please refer to Figure 5 , Figure 6 As shown in the figure, in some embodiments, the number of the power modules 10 can also be multiple, and the plurality of power modules 10 can be packaged in one cabinet, the first pipe group 32 includes a first main pipe 321 and a plurality of first branch pipes 322, the first main pipe 321 communicates with the inlet of the heat exchanger 31, and one end of each first branch pipe 322 communicates with the first main pipe 321 and the other end communicates with the air cavity 111 of one of the power modules 10. The second pipe group 33 includes a second main pipe 331 and a plurality of second branch pipes 332, the second main pipe 331 communicates with the outlet of the heat exchanger 31, and one end of each second branch pipe 332 communicates with the second main pipe 331 and the other end communicates with the sealed cavity of one of the power modules 10.

[0079] The power module 10 is modularly arranged, and a proper number of power modules 10 can be selected according to the functional requirements of the converter 100, and a set of condensing assemblies 30 can be shared, so that the modular design of the converter 100 and the cooling and heat dissipation requirements of the IGBT module 12 are ensured.

[0080] Referring to Figure 7 In some optional embodiments, the converter 100 provided by the embodiment of the present application further includes a liquid level detector 14, and the liquid level detector 14 is arranged in the sealed cavity. The liquid level detector 14 is configured to detect the liquid level of the phase-change heat transfer medium 13.

[0081] The liquid level detector 14 is arranged to detect the liquid level of the phase-change heat transfer medium 13 in the sealed cavity. In this way, it can be determined whether the IGBT module 12 is immersed in the phase-change heat transfer medium 13 according to the liquid level, and it can also be determined whether the height or volume of the air cavity 111 meets the requirements, so as to ensure that the phase-change heat transfer medium 13 has a proper height in the sealed cavity and ensure the heat exchange efficiency with the IGBT module 12.

[0082] Referring to Figures 1 to 7 In some optional embodiments, the converter 100 provided by the embodiment of the present application is provided with a liquid discharge port 15 on the packaging shell 11, and the liquid discharge port 15 is provided with a first control valve 16.

[0083] Through the above arrangement, when the IGBT module 12 is damaged and needs to be replaced or needs to be repaired, the first control valve 16 can be used to control the on-off of the liquid discharge port 15 to achieve the liquid discharge requirement.

[0084] In some optional embodiments, the converter 100 provided by the embodiment of the present application can be arranged such that the height of the heat exchanger 31 is higher than that of the power module 10. In this way, after the heat exchanger 31 exchanges heat with the gaseous phase-change heat transfer medium 13 and restores it to the liquid state, the liquid phase-change heat transfer medium 13 can return to the sealed cavity under the action of gravity.

[0085] Of course, this is an optional implementation, and in some embodiments, the condensing assembly 30 can further include a driving pump 34 arranged in the second pipe group 33. The driving pump 34 is used to provide operating power for the phase-change heat transfer medium 13 restored to the liquid state.

[0086] The converter 100 provided by the embodiment of the present application is provided with the driving pump 34, and when the heat exchanger 31 exchanges heat with the gaseous phase-change heat transfer medium 13 and makes the phase-change heat transfer medium 13 change phase to the liquid state, the driving pump 34 can provide operation power to the phase-change heat transfer medium 13 in the liquid state, so that the phase-change heat transfer medium 13 can return to the sealed chamber smoothly, and the cooling of the IGBT module 12 is ensured.

[0087] Please refer to Figure 7 In some optional embodiments, the converter 100 provided by the embodiment of the present application further comprises a temperature detector 18, and the temperature detector 18 is configured to detect the temperature of at least one of the phase-change heat transfer medium and the IGBT module 12.

[0088] Optionally, the temperature detector 18 can be used to detect the temperature of both the phase-change heat transfer medium 13 and the IGBT module 12.

[0089] In some optional embodiments, the temperature detector 18 can comprise a first temperature sensor 181 and a second temperature sensor 182, the first temperature sensor 181 is used to detect the temperature T1 of the phase-change heat transfer medium 13, and the second temperature sensor 182 is used to detect the temperature T2 of the IGBT module 12, and the converter further comprises a controller connected with the heat exchanger, and the controller controls the heat exchange rate of the heat exchanger according to the temperature of the phase-change heat transfer medium 13 and the temperature of the IGBT module 12.

[0090] For example, in the case of the air-cooled heat exchanger 31, the start-stop and air volume adjustment of the heat exchanger 31 are jointly controlled according to the temperature T1 of the phase-change heat transfer medium 13 and the temperature T2 of the IGBT module 12, when the wind turbine starts to operate, the IGBT module 12 generates heat, and T1 and T2 gradually increase, when any one of T1 or T2 is greater than the upper limit of the respective set value, the heat exchanger 31 is started, and the air volume of the fan of the heat exchanger 31 is adjustable. When the operating power of the wind turbine changes, the heat generated by the IGBT module 12 also changes at any time, if T1 and T2 increase, the air volume of the fan of the heat exchanger 31 is gradually increased, the heat exchange rate is increased, if T1 and T2 decrease, the air volume of the fan of the heat exchanger 31 is gradually decreased, the heat exchange rate is decreased, and T1 and T2 are kept stable within a reasonable preset range. When T1 and T2 are less than the minimum set value, the heat exchanger 31 is turned off. If the system is provided with the driving pump 34, the start-stop of the driving pump 34 is linked with the fan of the heat exchanger 31, the fan is started, and the driving pump 34 is started, and the fan is stopped, and the driving pump 34 is stopped.

[0091] For example, in the case of water-cooled heat exchanger 31, the water supply flow and temperature of the heat exchanger 31 are jointly controlled according to the temperature T1 of the phase-change heat transfer medium 13 and the temperature T2 of the IGBT module 12. When any one of the temperatures T1 or T2 is greater than the upper limit of the respective set value, the water supply to the heat exchanger 31 is turned on, and at least one of the water supply flow or temperature can be adjusted. When the operating power of the wind turbine varies, the heat generation of the IGBT module 12 also varies at any time. When the temperatures T1 and T2 increase, the water supply temperature of the heat exchanger 31 is adjusted and controlled to decrease, or the water supply flow of the heat exchanger 31 is adjusted and controlled to increase, so that the heat exchange rate increases. When the temperatures T1 and T2 decrease, the water supply temperature of the heat exchanger 31 is adjusted and controlled to increase, or the water supply flow of the heat exchanger 31 is adjusted and controlled to decrease, so that the heat exchange rate decreases, until the temperatures T1 and T2 are stabilized within the pre-set reasonable range. When the temperatures T1 and T2 are both less than the minimum set value, the water supply to the heat exchanger 31 is stopped. If the system is provided with a drive pump 34, the start and stop of the drive pump 34 is linked with the water supply of the heat exchanger 31.

[0092] Please continue to refer to Figure 7 In some optional embodiments, one embodiment of the present application provides the converter 100, further comprising a heater 17 configured to heat the phase-change heat transfer medium 13 in the sealed chamber.

[0093] Optionally, the heater 17 can be arranged in the sealed chamber, and the connector of the heater 17 can be led out by the wall of the packaging shell 11 to be electrically connected with the outside and obtain electric energy, so as to heat the phase-change heat transfer medium 13.

[0094] When the wind turbine does not generate electricity or operates at a very small power, the IGBT module 12 does not generate heat or generates very little heat. If the ambient temperature is low at this time, the temperature of the phase-change heat transfer medium 13 can be lower than the tolerance temperature of the IGBT. When the temperature T1 of the phase-change heat transfer medium 13 is less than the set value, a feedback signal is sent to the control system, and the electric heater 17 can be controlled to be turned on to control the liquid temperature within a reasonable range.

[0095] Optionally, the converter 100 can be provided with alarm values for high temperature, low temperature, high pressure, low pressure, low liquid level, and high liquid level. When the temperature or pressure is greater than or less than the set value, a signal is transmitted to the control system, and an alarm or shutdown is performed.

[0096] In some optional embodiments, one embodiment of the present application provides the converter 100, further comprising a pressure detector 19 for detecting the pressure in the sealed chamber.

[0097] Optionally, in some optional embodiments, one embodiment of the present application provides the converter 100, further comprising an exhaust valve 70, which can release the pressure in the sealed chamber when the pressure in the sealed chamber is too high.

[0098] Please refer to Figure 8 In some alternative embodiments, the converter 100 provided by an embodiment of the present application further comprises a capacitor bank 40 electrically connected to the IGBT module 12. Alternatively, the capacitor bank 40 can be located outside the power module 10 and fixedly arranged with the packaging shell 11.

[0099] Alternatively, the wiring terminals of the IGBT module 12 can be extended from the side plate of the packaging shell 11 and electrically connected to the capacitor bank 40. A sealing pad, sealing glue or other structure can be arranged between the wiring terminals and the packaging shell 11 to achieve sealing, thereby avoiding leakage of the liquid phase-change heat transfer medium 13.

[0100] The converter 100 provided by an embodiment of the present application can buffer voltage spikes by arranging the capacitor bank 40. During switching of the IGBT module 12, high voltage spikes can be generated due to inductance elements in the circuit. The capacitor bank 40 can absorb these voltage spikes and limit the voltage rise rate at both ends of the IGBT, thereby protecting the IGBT module 12 from high voltage damage and prolonging its service life. In addition, the converter 100 generates high-frequency noise and ripple during operation. The capacitor bank 40 can filter the DC voltage output by the power supply, smooth the DC bus voltage, and provide stable DC voltage for the IGBT module 12, thereby reducing the impact of voltage fluctuations on the operation of the IGBT module 12. At the same time, the capacitor bank 40 also has the functions of energy storage and energy feedback, power factor improvement, electromagnetic interference suppression, and the like, thereby ensuring the reliability of the converter 100.

[0101] In some alternative embodiments, when the converter 100 provided by an embodiment of the present application comprises the capacitor bank 40, arranging the capacitor bank 40 outside the power module 10 and fixedly arranging it with the packaging shell 11 is only one alternative implementation.

[0102] Please refer to Figure 9 In some embodiments, the capacitor bank 40 can also be located in the air cavity 111 of the power module 10 and connected with the packaging shell 11.

[0103] The connection between the capacitor bank 40 and the packaging shell 11 can be achieved by a connector support or the like. Alternatively, the capacitor bank 40 can be connected with the packaging shell 11 and supported in the packaging shell 11 by the support 20.

[0104] That is, the capacitor bank 40 and the IGBT module 12 can be integrally packaged in the packaging shell 11. In this way, when the phase-change heat transfer medium 13 absorbs heat generated by the IGBT module 12 and changes into a gaseous state to enter the air cavity 111, the gaseous phase-change heat transfer medium 13 can flow through the capacitor bank 40, absorb heat in the capacitor bank 40, and then enter the condensing assembly 30. Under the action of the condensing assembly 30, the phase-change heat transfer medium 13 returns to the liquid state and returns to the sealed chamber.

[0105] The converter 100 provided by the embodiment of the application can facilitate the electrical connection between the IGBT module 12 and the capacitor bank 40, and can also take full advantage of the phase change heat transfer medium 13 in the gaseous state to cool the capacitor bank 40, thereby reducing resource waste and reducing the cost of the converter 100.

[0106] In some optional embodiments, the converter 100 provided by the embodiment of the application further comprises a cabinet 60 and a reactor 50, the reactor 50 is arranged outside the packaging shell 11 and is electrically connected with the IGBT module 12, the reactor 50, the power module 10 and the capacitor bank 40 are all arranged in the cabinet 60, and the heat exchanger 31 can be arranged on the top wall of the cabinet 60.

[0107] The converter 100 provided by the embodiment of the application can take advantage of the cabinet 60 to protect the reactor 50, the capacitor bank 40 and the power module 10, and the reactor 50 can limit the rising and falling rates of the current by using the inductive characteristics of the reactor 50, thereby reducing the voltage and current stress in the switching process of the IGBT module 12 and protecting the IGBT module 12. The heat exchanger 31 can be arranged on the top wall of the cabinet 60, which is conducive to the backflow of the phase change heat transfer medium 13 after heat exchange and phase change recovery to the liquid state.

[0108] In some optional embodiments, the converter 100 provided by the embodiment of the application further comprises a liquid storage tank 35, the liquid storage tank 35 is connected with the second pipe group 33.

[0109] When the converter 100 is working, the volume of the liquid in the system will change due to temperature change, and the liquid storage tank 35 can be used to store the excess phase change heat transfer medium 13, thereby avoiding excessive pressure in the sealed chamber and affecting the reliability of the converter 100.

[0110] The wind turbine generator provided by the embodiment of the application can ensure the conversion effect of wind energy to electric energy, and the reliability of the converter 100 is high.

[0111] Although the utility model has been described with reference to the preferred embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A current transformer, characterized by The application relates to a power module (10) comprising a package housing (11) having a sealed cavity, an IGBT module (12) and a phase-change heat transfer medium (13) arranged in the sealed cavity, wherein a liquid surface of the phase-change heat transfer medium (13) and the package housing (11) have an air cavity (111) in a first direction (X), the IGBT module (12) is immersed in the phase-change heat transfer medium (13), and the phase-change heat transfer medium (13) can absorb heat of the IGBT module (12) and change into a gaseous state. The application further relates to a condensing assembly (30) arranged outside the power module (10), wherein the condensing assembly (30) comprises a heat exchanger (31), a first pipe group (32) and a second pipe group (33), the first pipe group (32) is in communication with the air cavity (111) and an inlet of the heat exchanger (31), the second pipe group (33) is in communication with an outlet of the heat exchanger (31) and the sealed cavity, the first pipe group (32) is used for guiding the phase-change heat transfer medium (13) in the gaseous state to the heat exchanger (31), the heat exchanger (31) is used for heat exchanging with the phase-change heat transfer medium (13) in the gaseous state and changing the phase-change heat transfer medium (13) back to the liquid state, and the second pipe group (33) is used for guiding the phase-change heat transfer medium (13) in the liquid state in the heat exchanger (31) back to the sealed cavity to circulate and cool the IGBT module (12). The power module (10) further comprises a support (20) at least partially immersed in the phase-change heat transfer medium (13), the support (20) is connected with the package housing (11), and the IGBT module (12) is arranged on the support (20).

2. The current transformer of claim 1, wherein, The power module (10) comprises a plurality of supports (20), and the supports (20) are arranged at intervals, and the IGBT module (12) is arranged on each support (20).

3. The current transformer of claim 2, wherein, The supports (20) are arranged at intervals in a second direction (Y), and each support (20) is provided with two or more IGBT modules (12) on both sides in the second direction (Y), the IGBT modules (12) on the same side of the support (20) in the second direction (Y) are arranged at intervals in the first direction (X), and the second direction (Y) intersects the first direction (X).

4. The current transformer of claim 3, wherein, The supports (20) are arranged at intervals in the first direction (X), and each support (20) is provided with two or more IGBT modules (12) on a side facing the air cavity (111), and the IGBT modules (12) on the same support (20) are arranged at intervals in the second direction (Y).

5. The current transformer of claim 3, wherein, In the first direction (X), the IGBT modules (12) on two adjacent supports (20) are arranged at intervals, and the IGBT modules (12) on one of the two adjacent supports (20) which is closer to the air cavity (111) are provided with a clearance hole (21) corresponding to the IGBT modules (12) on the other support (20). ​ 6. The current transformer of claim 1, wherein, The number of the power modules (10) is multiple, the first pipe group (32) comprises a first main pipe (321) and multiple first branch pipes (322), the first main pipe (321) communicates with the inlet, one end of each of the first branch pipes (322) communicates with the first main pipe (321) and the other end communicates with the air cavity (111) of one of the power modules (10); The second pipe group (33) comprises a second main pipe (331) and multiple second branch pipes (332), the second main pipe (331) communicates with the outlet, one end of each of the second branch pipes (332) communicates with the second main pipe (331) and the other end communicates with the sealed chamber of one of the power modules (10).

7. The current transformer of any one of claims 1 to 6, characterized in that The power module (10) further comprises a liquid level detector (14) arranged in the sealed chamber, the liquid level detector (14) is configured to detect the liquid level of the phase change heat transfer medium (13); And / or, the packaging shell (11) is provided with a liquid discharge port (15) communicating with the sealed chamber, the first control valve (16) is arranged at the liquid discharge port (15).

8. The current transformer of any one of claims 1 to 6, characterized in that The condensing assembly (30) further comprises a driving pump (34) arranged in the second pipe group (33), the driving pump (34) is used to provide operating power for the phase change heat transfer medium (13) recovered to liquid state.

9. The current transformer of any one of claims 1 to 6, characterized in that The current transformer (100) further comprises a capacitor bank (40) electrically connected with the IGBT module (12), wherein: The capacitor bank (40) is located in the air cavity (111) of the power module (10) and connected with the packaging shell (11); or, the capacitor bank (40) is located outside the power module (10) and fixedly arranged with the packaging shell (11).

10. The current transformer of claim 9, wherein, The current transformer (100) further comprises a cabinet (60) and a reactor (50), the reactor (50), the power module (10) and the capacitor bank (40) are arranged in the cabinet (60), the heat exchanger (31) is arranged on the top wall of the cabinet (60), and the reactor (50) is arranged outside the packaging shell (11) and electrically connected with the IGBT module (12).

11. The current transformer (100) according to any one of claims 1 to 6, characterized in that The power module (10) further comprises a heater (17) and a temperature detector (18), the temperature detector (18) is configured to detect the temperature of at least one of the phase change heat transfer medium (13) and the IGBT module (12), and the heater (17) is configured to heat the phase change heat transfer medium (13) in the sealed chamber.

12. The current transformer (100) according to claim 11, characterized in that The temperature detector comprises a first temperature sensor (181) configured to detect the temperature of the phase-change heat transfer medium (13) and a second temperature sensor (182) configured to detect the temperature of the IGBT module (12), and the converter further comprises a controller connected to the heat exchanger, the controller controlling the heat exchange rate of the heat exchanger according to the temperature of the phase-change heat transfer medium (13) and the temperature of the IGBT module (12).

13. A wind power unit, characterized in that The converter (100) according to any one of claims 1 to 12.

Images