A wind power generator converter heat dissipation performance testing device

Abstract

The application relates to the wind power operation and maintenance technical field, in particular to a wind driven generator converter heat dissipation performance testing device, which comprises a box body, the box body is internally provided with a cavity for mounting a circuit board, one side of the box body is provided with a clamping assembly for clamping a power unit and a plurality of connecting strips, one end of the connecting strip away from the box body is provided with an upper contact body and a lower contact body, the spacing between the upper contact body and the lower contact body is adjustable, the side of the upper contact body and the lower contact body away from each other is provided with a thermocouple contact, and the connecting strip is internally embedded with a wire for electrically connecting with the thermocouple contact. The embodiment of the application is through the integrated testing device, the operator only needs to insert the connecting strip into the power unit, so that the matched thermocouple is in contact with the bridge type elastic pressing sheet and the heat dissipation plate, temperature monitoring is realized, the heat dissipation capacity test is completed, the operator does not need to disassemble the power unit, and the convenience and accuracy of the operator in testing the converter power unit are remarkably improved.

Description

Technical Field

[0001] This application relates to the technical field of wind power operation and maintenance, and in particular to a test device for the heat dissipation performance of a wind turbine converter. Background Technology

[0002] The power unit is an important component of the wind turbine converter. It is located inside the converter and is assembled from a DC bus, frame, capacitors, and a drive board that integrates IGBTs. Existing testing devices for the heat dissipation performance of power units in wind turbine converters generally require disassembling the power unit from the converter and then conducting independent heat dissipation stress tests. This testing method cannot accurately simulate the heat dissipation performance of the power unit under actual working conditions in the converter. Therefore, there is a need for a device that can be directly applied to the power unit in a converter to test its heat dissipation performance, which is easy for operators to use and can closely reflect the actual working state of the power unit in the converter. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a wind turbine generator converter heat dissipation performance testing device. In this embodiment, an integrated testing device is used, where the operator only needs to insert the connecting strip into the power unit to make the matching thermocouple contact with the bridge-type elastic pressure plate and heat sink, thereby achieving temperature monitoring to complete the heat dissipation capacity test. There is no need for the operator to disassemble the power unit, which significantly improves the convenience and accuracy of the operator in testing the converter power unit.

[0004] The above-mentioned objective of this application is achieved through the following technical solution: A test device for the heat dissipation performance of a wind turbine converter includes a housing with a cavity for mounting a circuit board inside. One side of the housing is provided with a snap-fit ​​assembly for snapping a power unit and several connecting strips. The vertical thickness of the connecting strips is less than 3 mm. The end of the connecting strip away from the housing has an upper contact and a lower contact. The distance between the upper and lower contact is adjustable. The sides of the upper and lower contacts away from each other have thermocouple contacts. A wire for electrical connection with the thermocouple contacts is embedded inside the connecting strip. The wire is electrically connected to the circuit board inside the housing. In operation, the thermocouple contacts on the upper and lower contact bodies are in contact with the bridge-type elastic plate and heat sink of the converter power unit, respectively.

[0005] Optionally, a U-shaped spring is provided between the upper contact body and the lower contact body. The two sides of the U-shaped spring are embedded in the upper contact body and the lower contact body. When the upper contact body and the lower contact body approach each other, the U-shaped spring undergoes elastic deformation.

[0006] Optionally, in the installed state, there is a separator between the U-shaped spring and the thermocouple contact.

[0007] Optionally, both the upper and lower contact bodies have U-shaped grooves in the middle to avoid the mounting screws of the bridge-type elastic pressure plate.

[0008] Optionally, both the upper and lower contact bodies have two thermocouple contacts, with the two thermocouple contacts on the upper and lower contact bodies located on opposite sides of the U-shaped groove.

[0009] Optionally, the thermocouple contacts on the upper contact body are arc-shaped, and the thermocouple contacts on the upper contact body protrude in a direction away from the upper contact body.

[0010] Optionally, the end of the upper contact body away from the connecting strip has a guide portion that is inclined downward in the direction of the contact body.

[0011] In summary, this application has the following beneficial technical effects: This application embodiment uses an integrated testing device. The operator only needs to insert the connecting strip into the power unit to make the matching thermocouple contact with the bridge-type elastic pressure plate and heat sink, so as to realize temperature monitoring and complete the heat dissipation capacity test. There is no need for the operator to disassemble the power unit, which significantly improves the convenience and accuracy of the operator in testing the converter power unit. Attached Figure Description

[0012] Figure 1 This is an assembly diagram of one embodiment of this application; Figure 2 This is a side view of a connecting strip according to one embodiment of this application; Figure 3 This is a side cross-sectional view of a connecting strip according to one embodiment of this application; Figure 4 This is a top view schematic diagram of a connecting strip with a U-shaped groove in one embodiment of this application.

[0013] Attached reference numerals: 10, Box body; 20. Snap-fit ​​assembly; 30. Connecting strip; 31. Upper contact body; 32. Lower contact body; 33. Wire; 34. U-shaped spring; 35. Separating layer; 36. U-shaped groove; 37. Guide part; 38. Thermocouple contact. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0015] To better understand the technical solutions provided in the embodiments of this application, a brief introduction to the prior art is given first.

[0016] The power unit is a crucial component of the wind turbine converter. Located inside the converter, it is assembled from a DC bus, frame, capacitors, and a driver board integrating IGBTs. IGBTs (Insulated Gate Bipolar Transistors) are the core power semiconductor devices in wind turbine converters, responsible for high-frequency switching of electrical energy. They combine the voltage control characteristics of MOSFETs (Metal-O-Factory Transistors) with the high current capability of BJTs (Bipolar Junction Transistors). Taking a 1.5MW converter as an example, the instantaneous power consumption of a single IGBT can reach several kilowatts. If the junction temperature exceeds 175°C, it will cause device failure. The junction temperature must be controlled below 125°C through a heat dissipation system. Therefore, the heat dissipation performance of the converter's power unit is extremely important.

[0017] Existing testing devices for the heat dissipation performance of power units in wind turbine converters generally require disassembling the power unit from the converter and then conducting independent heat dissipation stress tests. This testing method cannot accurately simulate the heat dissipation performance of the power unit under actual operating conditions in the converter. This is because, under actual operating conditions in the converter, the power unit has both positive gains from dedicated air-cooled heat dissipation channels and negative gains caused by complex stacking.

[0018] The reason why the power unit is separated from the converter for heat dissipation capacity testing in the existing technology is that the components are densely arranged in the converter, the test device is large and difficult to set up in the converter, and it is inconvenient for operators to operate.

[0019] Based on the above-mentioned technical problems, this application provides a wind turbine generator converter heat dissipation performance testing device, which enables operators to conveniently apply the testing device to the converter to quickly and realistically test the heat dissipation performance of the power unit.

[0020] The testing device includes a housing 10, which has a chamber inside. An integrated circuit board for receiving electrical signals and performing data storage and calculation is installed inside the chamber. A snap-fit ​​assembly 20 for snapping on a power unit and several connecting strips 30 are provided on one side of the housing 10. The vertical thickness of the connecting strips 30 is less than 3 mm. The end of the connecting strip away from the housing 10 has an upper contact 31 and a lower contact 32. The distance between the upper contact 31 and the lower contact 32 is adjustable. The sides of the upper contact 31 and the lower contact 32 that are away from each other have thermocouple contacts 38. A wire 33 for electrically connecting to the thermocouple contacts 38 is embedded inside the connecting strip 30. The wire 33 is electrically connected to the circuit board inside the housing 10. In use, the snap-fit ​​assembly 20 snaps into the outer frame of the power unit, and the thermocouple contacts 38 on the upper contact body 31 and the lower contact body 32 respectively contact the bridge-type elastic pressure plate and the heat sink of the converter power unit.

[0021] The following section will provide further details based on specific usage scenarios.

[0022] During use, the operator inserts several connecting strips 30 into the power unit. The insertion position is between the drive board and the DC busbar. After insertion, the snap-fit ​​component 20 is tightly attached to the outer shell of the power unit, thereby achieving relative fixation of the position of the test device.

[0023] After the operator completes the insertion, the thermocouple contacts 38 on the upper contact body 31 and the lower contact body 32 contact with the bridge-type elastic pressure plate and the bottom heat sink, respectively. The electrical signal is electrically connected to the integrated circuit board inside the housing 10 through the wire 33. At this time, the converter starts to work, and the operator can test the heat dissipation performance of the power unit by reading the thermocouples built into the IGBT tube and the thermocouples of the test device.

[0024] It can be seen that the embodiments of this application use an integrated testing device. The operator only needs to insert the connecting strip 30 into the power unit to make the matching thermocouple contact with the bridge elastic pressure plate and heat sink, so as to realize temperature monitoring and complete the heat dissipation capacity test. There is no need for the operator to disassemble the power unit, which significantly improves the convenience and accuracy of the operator in testing the power unit of the converter.

[0025] In this embodiment, the snap-fit ​​assembly 20 may be a plastic or metal part fixed to both ends of the housing 10. An elastic anti-slip piece is provided on the opposite side of the two plastic or metal parts. When the operator inserts the connecting strip 30, as the housing 10 moves closer to the power unit, the anti-slip pieces of the two plastic or metal parts naturally adhere tightly to the outer shell of the power unit to fix the test device.

[0026] In some possible implementations of this application, a U-shaped spring sheet 34 is provided between the upper contact body 31 and the lower contact body 32. The two sides of the U-shaped spring sheet 34 are embedded in the upper contact body 31 and the lower contact body 32. When the upper contact body 31 and the lower contact body 32 approach each other, the U-shaped spring sheet 34 undergoes elastic deformation. That is, after the connecting strip 30 is inserted into the power unit, the elastic force of the U-shaped spring sheet 34 causes the upper contact body 31 and the lower contact body 32 to open up, thereby allowing the thermocouple to contact the heat sink and the bridge-type pressure plate.

[0027] There is a separating layer 35 between the U-shaped spring 34 and the thermocouple contact 38, thereby preventing contact between the U-shaped spring 34 and the thermocouple contact 38. The separating layer 35 is actually part of the upper contact body 31 or the lower contact body 32.

[0028] In some possible implementations of this application, both the upper contact body 31 and the lower contact body 32 have U-shaped grooves 36 in the middle to avoid the mounting screws of the bridge-type elastic pressure plate. When the connecting strip 30 is inserted, the U-shaped grooves 36 can match the mounting screws of the bridge-type pressure plate, so that the thermocouple contacts 38 can be more completely in contact with the heated surface. There are two thermocouple contacts 38 on both the upper contact body 31 and the lower contact body 32. The two thermocouple contacts 38 on the upper contact body 31 and the lower contact body 32 are respectively located on both sides of the U-shaped grooves 36, thereby providing a more complete test range.

[0029] In some possible implementations of this application, the thermocouple contact 38 on the upper contact body 31 is arc-shaped and protrudes in a direction away from the upper contact body 31. Since the bridge-type press is heated less during operation, the temperature monitoring of the bridge-type press is essentially to test whether the bridge-type press exceeds the temperature under normal use. Therefore, the arc-shaped thermocouple contact can be attached to it. The arc-shaped thermocouple contact 38 can also adapt to the pushing environment and avoid jamming. On this basis, the end of the upper contact body 31 away from the connecting strip 30 has a guide part 37 that is inclined downward in the direction of the contact body 32, which can further enable the upper contact body 31 to smoothly enter the designated test area.

[0030] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for testing the heat dissipation performance of a wind turbine generator converter, characterized in that, Includes a housing (10), the housing (10) has a cavity for mounting a circuit board inside, a snap-fit ​​assembly (20) for snapping a power unit and several connecting strips (30) are provided on one side of the housing (10), the connecting strips (30) away from the housing (10) have an upper contact (31) and a lower contact (32), the spacing between the upper contact (31) and the lower contact (32) is adjustable, the upper contact (31) and the lower contact (32) each have a thermocouple contact (38) on the side away from each other, and a wire (33) for electrically connecting with the thermocouple contact (38) is embedded inside the connecting strip (30), the wire (33) is electrically connected to the circuit board inside the housing (10); In use, the thermocouple contacts (38) on the upper contact body (31) and the lower contact body (32) are in contact with the bridge-type elastic plate and the heat sink of the converter power unit, respectively.

2. The wind turbine generator converter heat dissipation performance testing device according to claim 1, characterized in that, A U-shaped spring sheet (34) is provided between the upper contact body (31) and the lower contact body (32). The two sides of the U-shaped spring sheet (34) are embedded in the upper contact body (31) and the lower contact body (32). When the upper contact body (31) and the lower contact body (32) approach each other, the U-shaped spring sheet (34) undergoes elastic deformation.

3. The wind turbine generator converter heat dissipation performance testing device according to claim 2, characterized in that, In the installed state, there is a separating layer (35) between the U-shaped spring (34) and the thermocouple contact (38).

4. The wind turbine generator converter heat dissipation performance testing device according to claim 1, characterized in that, Both the upper contact body (31) and the lower contact body (32) have U-shaped grooves (36) in the middle to avoid the mounting screws of the bridge-type elastic pressure plate.

5. The wind turbine generator converter heat dissipation performance testing device according to claim 4, characterized in that, Thermocouple contacts (38) on the upper contact body (31) and the lower contact body (32) are each two, and the two thermocouple contacts (38) on the upper contact body (31) and the lower contact body (32) are respectively located on both sides of the U-shaped groove (36).

6. The wind turbine generator converter heat dissipation performance testing device according to claim 1, characterized in that, The thermocouple contact (38) on the upper contact body (31) is arc-shaped and protrudes in a direction away from the upper contact body (31).

7. The wind turbine generator converter heat dissipation performance testing device according to claim 1, characterized in that, The upper contact body (31) has a guide (37) that is inclined in the direction of the lower contact body (32) at the end away from the connecting strip (30).

Images