Wind power grid-connected control cabinet and wind power converter

Abstract

The utility model belongs to the technical field of converters, and particularly relates to a wind power grid-connected control cabinet and a wind power converter, the interior of each grid-connected cabinet is divided into a cavity I and a cavity II, the two grid-connected cabinets are arranged side by side, and the interiors of the two grid-connected cabinets are separated by a partition plate I; a fan I and a heat exchanger I are arranged in areas, corresponding to the cavities I of the two grid-connected cabinets, on the partition plate I; an air outlet of the heat exchanger I, the cavity I of one grid-connected cabinet, the fan I, the cavity I of the other grid-connected cabinet and an air inlet of the heat exchanger I form a first circulating air duct; a fan II and a heat exchanger II are arranged in the area, corresponding to the cavities II of the two grid-connected cabinets, of the partition plate I. An air outlet of the heat exchanger II, the cavity II of one grid-connected cabinet, the fan II, the cavity II of the other grid-connected cabinet and an air inlet of the heat exchanger II form a second circulating air duct. According to the utility model, the temperature rise control of the device is more reasonable, the temperature uniformity and the control flexibility are ensured, and the arrangement number of the cooling modules is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of converters, and particularly relates to a wind power grid-connected control cabinet and a wind power converter. Background Art

[0002] In recent years, with the continuous development of wind power generation technology and the continuous increase in the single-unit capacity of wind turbines, the power rating of the doubly-fed wind power converter matching it has also been continuously increasing. While the power rating of the converter is continuously increasing, it is also required that the current value passing through its grid-connected control cabinet continues to increase. When the power rating of the doubly-fed wind power converter reaches 12 MW and above, when a single grid-side circuit breaker commonly used in the industry is used alone, its electrical performance no longer meets the requirements of the converter grid-side current value, and two or more grid-side circuit breakers need to be used in parallel. At the same time, with the increase in the current value and the increase in the number of devices, the operating heat is also continuously increasing, and the cooling pressure of the converter grid-connected control cabinet rises. If the interiors of each cabinet are directly connected and a fan and a heat exchanger are used to make the cooling air circulate, although it can achieve the effect of heat dissipation, due to the differences in heat dissipation losses in each cabinet and different partitions within the cabinet, this cooling method is not conducive to controlling the temperature rise of the control devices. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a wind power grid-connected control cabinet and a wind power converter with more reasonable and flexible control of device temperature rise.

[0004] The utility model provides a wind power grid-connected control cabinet, which includes two grid-connected cabinets. The interior of a single grid-connected cabinet is divided into cavity Ⅰ and cavity Ⅱ by partition board Ⅱ. The stator-side devices are arranged in cavity Ⅰ, and the grid-side devices are arranged in cavity Ⅱ. There are two grid-connected cabinets, and the two grid-connected cabinets are arranged side by side, and the interiors of the two grid-connected cabinets are separated by partition board Ⅰ;

[0005] A fan Ⅰ and a heat exchanger Ⅰ are arranged on partition board Ⅰ corresponding to the areas of cavity Ⅰ of the two grid-connected cabinets. The air outlet of the heat exchanger Ⅰ, cavity Ⅰ of one grid-connected cabinet, fan Ⅰ, cavity Ⅰ of the other grid-connected cabinet, and the air inlet of the heat exchanger Ⅰ form a first circulation air duct;

[0006] A fan Ⅱ and a heat exchanger Ⅱ are arranged on partition board Ⅰ corresponding to the areas of cavity Ⅱ of the two grid-connected cabinets. The air outlet of the heat exchanger Ⅱ, cavity Ⅱ of one grid-connected cabinet, fan Ⅱ, cavity Ⅱ of the other grid-connected cabinet, and the air inlet of the heat exchanger Ⅱ form a second circulation air duct.

[0007] Furthermore, the stator-side devices include a stator-side contactor and a stator-side external busbar assembly, and the grid-side devices include a grid-side circuit breaker and a grid-side external busbar assembly. The stator-side contactor and the grid-side circuit breaker in a single grid-connected cabinet are connected by a busbar Ⅲ passing through partition board Ⅱ.

[0008] Further, the stator-side external busbar assembly includes several busbars Ⅰ, and the phase sequence arrangement direction of the several busbars Ⅰ is perpendicular to the flowing direction of the cooling air when it passes through the stator-side external busbar assembly. The interval between adjacent busbars Ⅰ forms a channel for the cooling air to pass through.

[0009] Further, the grid-side external busbar assembly includes several busbars Ⅱ, and the phase sequence arrangement direction of the several busbars Ⅱ is perpendicular to the flowing direction of the cooling air when it passes through the grid-side external busbar assembly. The interval between adjacent busbars Ⅱ forms a channel for the cooling air to pass through.

[0010] Further, the wiring points Ⅰ on adjacent busbars Ⅰ are arranged in a staggered manner, and the wiring points Ⅱ on adjacent busbars Ⅱ are arranged in a staggered manner.

[0011] Further, a transformer, a UPS power supply, two control components and three filter components are arranged in the control cabinet. The two control components are correspondingly arranged at the upper and lower parts in the control cabinet. The heat exchanger Ⅲ is arranged between the two control components. One side and both ends of the two control components are spaced from the inner side wall of the control cabinet. The UPS power supply is located at the bottom of the control cabinet. The transformer is located above the UPS power supply and is centrally arranged in the control cabinet. The three filter components are located above the UPS power supply and are arranged in sequence along the height direction of the control cabinet.

[0012] Further, the outgoing line position of the grid-side external busbar assembly is at the top, front, back or side of the grid connection cabinet.

[0013] Further, the heat exchanger Ⅰ, the heat exchanger Ⅱ and the heat exchanger Ⅲ are all water-air heat exchangers and are connected to an external water-cooled heat exchange unit.

[0014] The content of the present utility model also provides a wind power converter, which is provided with the above-mentioned wind power grid connection control cabinet.

[0015] The beneficial effects of the present utility model are that independent cooling modules are provided in the areas where the devices on different sides inside a single grid connection cabinet are located. The temperature rise inside each cabinet can be flexibly controlled according to the allowable operating temperature of the respective internal devices. The heat dissipation power on different sides of the grid connection cabinet can be flexibly adjusted according to the device requirements on that side. The overall heat dissipation is more uniform, effectively avoiding excessive local temperature rise of the devices, and the temperature rise control of the devices is more reasonable, which can effectively extend the service life of the devices and reduce the device failure rate. The areas where the devices on the same side of two grid connection cabinets are located share the same cooling module. On the basis of the parallel use of two grid connection cabinets, while ensuring the temperature uniformity and control flexibility, the number of arranged cooling modules is reduced, which is beneficial to cost control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view inside the wind power grid connection control cabinet of the present utility model.

[0017] Figure 2 This is the rear view inside the wind power grid-connected control cabinet of the present utility model.

[0018] Figure 3 This is the right view inside the control cabinet of the present utility model.

[0019] Figure 4 This is the exploded view of partition I of the present utility model.

[0020] Figure 5 This is the schematic diagram of the cooling air circulation flow direction inside two grid-connected cabinets of the present utility model.

[0021] Figure 6 This is the schematic diagram of the cooling air circulation flow direction inside the control cabinet of the present utility model.

[0022] Figure 7 This is the structural diagram of the stator side external busbar assembly of the present utility model.

[0023] Figure 8 This is the structural diagram of the grid side external busbar assembly of the present utility model.

[0024] Figure 9 This is the structural diagram of other outgoing line methods of two grid-connected cabinets of the present utility model.

[0025] In the figure: 1, grid-connected cabinet; 2, control cabinet; 3, partition I; 4, fan I; 5, heat exchanger I; 6, fan II; 7, heat exchanger II; 8, stator side contactor; 9, stator side external busbar assembly; 91, busbar I; 92, wiring point I; 10, grid side circuit breaker; 11, grid side external busbar assembly; 111, busbar II; 112, wiring point II; 12, busbar III; 13, transformer; 14, UPS power supply; 15, control component; 16, filter component; 17, heat exchanger III; 18, partition II. Detailed implementation manners

[0026] As Figures 1 - 9 shown, the present utility model provides a wind power grid-connected control cabinet, which includes two grid-connected cabinets 1. Inside a single grid-connected cabinet 1, it is divided into cavity I and cavity II by a partition II 18, and the partition II 18 is arranged in the middle of the grid-connected cabinet 1. Stator side devices are arranged in cavity I, and grid side devices are arranged in cavity II. There are two grid-connected cabinets 1, and the two grid-connected cabinets 1 are arranged side by side, and the interiors of the two grid-connected cabinets 1 are separated by a partition I 3, that is, between the cavity I of the two grid-connected cabinets 1 and between the cavity II of the two grid-connected cabinets 1 are separated by the partition I 3.

[0027] On the partition I 3, a fan I 4 and a heat exchanger I 5 are arranged in the areas corresponding to the cavities I of the two grid connection cabinets 1. The air inlet of the fan I 4 and the air outlet of the heat exchanger I 5 face the cavity I of one of the grid connection cabinets 1, and the air outlet of the fan I 4 and the air inlet of the heat exchanger I 5 face the cavity I of the other grid connection cabinet 1. The air outlet of the heat exchanger I 5, the cavity I of one of the grid connection cabinets 1, the fan I 4, the cavity I of the other grid connection cabinet 1, and the air inlet of the heat exchanger I 5 form a first circulation air duct. The cooling air flows out from the air outlet of the heat exchanger I 5 and then enters the cavity I of one of the grid connection cabinets 1. After cooling the stator side devices, it enters the other grid connection cabinet 1 through the fan I 4. After cooling the stator side devices, it enters the heat exchanger I 5. The fan I 4 and the heat exchanger I 5 are the cooling modules for the cavities I of the two grid connection cabinets 1.

[0028] On the partition I 3, a fan II 6 and a heat exchanger II 7 are arranged in the areas corresponding to the cavities II of the two grid connection cabinets 1. The air inlet of the fan II 6 and the air outlet of the heat exchanger II 7 face the cavity II of one of the grid connection cabinets 1, and the air outlet of the fan II 6 and the air inlet of the heat exchanger II 7 face the cavity II of the other grid connection cabinet 1. The air outlet of the heat exchanger II 7, the cavity II of one of the grid connection cabinets 1, the fan II 6, the cavity II of the other grid connection cabinet 1, and the air inlet of the heat exchanger II 7 form a second circulation air duct. The cooling air flows out from the air outlet of the heat exchanger II 7 and then enters the cavity II of one of the grid connection cabinets 1. After cooling the stator side devices, it enters the other grid connection cabinet 1 through the fan II 6. After cooling the stator side devices, it enters the heat exchanger II 7. The fan II 6 and the heat exchanger II 7 are the cooling modules for the cavities II of the two grid connection cabinets 1.

[0029] For the wind power grid connection control cabinet provided by the present utility model, independent cooling modules are arranged in the areas where the devices on different sides inside a single grid connection cabinet 1 are located. The temperature rise inside each cabinet can be flexibly controlled according to the allowable operating temperature of the respective internal devices. The heat dissipation power on different sides of the grid connection cabinet 1 can be flexibly adjusted according to the device requirements on that side. The overall heat dissipation is more uniform, effectively avoiding excessive local temperature rise of the devices. The temperature rise control of the devices is more reasonable, which can effectively extend the service life of the devices and reduce the device failure rate. When the two grid connection cabinets 1 are arranged side by side, the areas where the devices on the same side between the two grid connection cabinets 1 share the same cooling module. On the basis of the parallel use of the two grid connection cabinets 1, while ensuring the temperature uniformity and control flexibility, the number of arranged cooling modules is reduced, which is beneficial to cost control.

[0030] The stator side devices include a stator side contactor 8 and a stator side external busbar assembly 9, and the grid side devices include a grid side circuit breaker 10 and a grid side external busbar assembly 11. The stator side contactor 8 and the grid side circuit breaker 10 inside a single grid connection cabinet 1 are connected through a busbar III 12 passing through the partition II 18 to achieve electrical conduction.

[0031] The stator-side external busbar assembly 9 includes several busbars I 91. The phase sequence arrangement direction of the several busbars I 91 is perpendicular to the flow direction of the cooling air when it passes through the stator-side external busbar assembly 9. As Figure 7 shown, the phase sequence arrangement direction of the busbars I 91 is the Y direction, and the flow direction of the cooling air when it passes through the stator-side external busbar assembly 9 is the X direction. The interval between adjacent busbars I 91 forms a channel for the cooling air to pass through. Based on this setting, the stator-side external busbar assembly 9 has a smaller obstruction effect on the cooling air, reduces the internal resistance of the grid connection cabinet 1, and can make the cooling air speeds on the surfaces of the busbars I 91 of each phase basically the same, avoiding excessive temperature rise of a certain phase of the busbar I 91 and having a better cooling effect.

[0032] The grid-side external busbar assembly 11 includes several busbars II 111. The phase sequence arrangement direction of the several busbars II 111 is perpendicular to the flow direction of the cooling air when it passes through the grid-side external busbar assembly 11. As Figure 8 shown, the phase sequence arrangement direction of the busbars II 111 is the Y direction, and the flow direction of the cooling air when it passes through the stator-side external busbar assembly 9 is the X direction. The interval between adjacent busbars II 111 forms a channel for the cooling air to pass through. Based on this setting, the grid-side external busbar assembly 11 has a smaller obstruction effect on the cooling air, reduces the internal resistance of the grid connection cabinet 1, and can make the cooling air speeds on the surfaces of the busbars II 111 of each phase basically the same, avoiding excessive temperature rise of a certain phase of the busbar II 111 and having a better cooling effect.

[0033] Among them, the wiring points I 92 on adjacent busbars I 91 are arranged in a staggered manner, and the wiring points II 112 on adjacent busbars II 111 are also arranged in a staggered manner, such as being staggered left and right or up and down, which is more convenient for on-site wiring operations and also for daily inspection, maintenance, and replacement. The heat exchanger I 5 and the heat exchanger II 7 are both water-air heat exchangers and are connected to an external water-cooled heat exchange unit. The water-air heat exchanger is specifically a heat exchange device including a fan module. Based on this setting method, the flow direction of the cooling air can be better controlled in the two grid connection cabinets 1, ensuring that the cooling air flows along the specified circulation path and obtaining a larger circulation air volume to meet the large heat dissipation requirements inside the grid connection cabinet 1.

[0034] The wind power grid-connected control cabinet provided by the present utility model further includes a control cabinet 2, which is separated from the two grid-connected cabinets 1, that is, the cooling air inside the control cabinet 2 does not communicate with that inside the two grid-connected cabinets 1. A heat exchanger III 17 is arranged inside the control cabinet 2. The heat exchanger III 17 is specifically a water-air heat exchanger, that is, a heat exchanger device including a fan module. The inside of the control cabinet 2 is cooled through the heat exchanger III 17, and the heat exchanger III 17 is the cooling module of the control cabinet 2. Separating the inside of the control cabinet 2 from that of the grid-connected cabinet 1 and using an independent cooling module can flexibly control the temperature rise inside each cabinet according to the allowable operating temperature of the internal components of each, and improve the heat dissipation uniformity. Since the heat dissipation requirement inside the control cabinet 2 is lower than that of the grid-connected cabinet 1, only the heat exchanger III 17, which is a water-air heat exchanger, can meet the heat dissipation requirement.

[0035] A transformer 13, a UPS power supply 14, two control components 15 and three filter components 16 are arranged inside the control cabinet 2. The two control components 15 are correspondingly arranged at the upper and lower parts inside the control cabinet 2. The heat exchanger III 17 is arranged between the two control components 15. One side and both ends of the two control components 15 are spaced from the inner side wall of the control cabinet 2. The transformer 13, the UPS power supply 14 and the three filter components 16 are located on the other side of the two control components 15. The UPS power supply 14 is located at the bottom inside the control cabinet 2. The transformer 13 is located above the UPS power supply 14 and is centrally arranged inside the control cabinet 2. The three filter components 16 are arranged in sequence along the height direction of the control cabinet 2. Based on this arrangement, the two control components 15 face the same side, which is convenient for operators to use. The rest of the electrical devices are correspondingly distributed on the back of the two control components 15, which can make the resistance of the cooling air flow more evenly inside the control cabinet 2 and ensure the consistency of upper and lower heat dissipation. The specific circulation direction of the cooling air inside the control cabinet 2 is as Figure 6 shown.

[0036] The outgoing line position of the grid-side external busbar assembly 11 is at any position on the top, front, back or side of the grid-connected cabinet 1. Among them, the front of the grid-connected cabinet 1 is the side with the cabinet door, and it is also the side where the operator performs daily operations. The back of the grid-connected cabinet 1 is the side opposite to the front. Figure 1 The grid-connected cabinet 1 located on the right side in Figure 2 and the grid-connected cabinet 1 located on the left side in Figure 1 are in the way of outgoing line along the side. Figure 2 The grid-connected cabinet 1 located on the left side in Figure 9 and the grid-connected cabinet 1 located on the right side in Figure 9 are in the way of outgoing line along the back.

[0037] The present utility model further provides a wind power converter, which is provided with the above-mentioned wind power grid-connected control cabinet. Due to the provision of the above-mentioned wind power grid-connected control cabinet, it can effectively avoid excessive local temperature rise of components, the temperature rise control of components is more reasonable, the service life of components can be effectively extended, and the failure rate of components can be reduced. On the basis of the parallel use of two grid-connected cabinets 1, while ensuring temperature uniformity and control flexibility, the layout quantity of cooling modules is reduced, which is beneficial to cost control.

[0038] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of protection of the present application is limited to these examples; under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0039] One or more embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application shall be included within the scope of protection of the present application.

Claims

1. A wind power grid-connected control cabinet, characterized in that, It includes two grid-connection cabinets (1). Inside a single grid-connection cabinet (1), it is divided into cavity I and cavity II by partition II (18). Stator-side devices are arranged in cavity I, and grid-side devices are arranged in cavity II. The two grid-connection cabinets (1) are arranged side by side, and the interiors of the two grid-connection cabinets (1) are separated by partition I (3). On partition I (3), in the area corresponding to cavity I of the two grid-connection cabinets (1), a fan I (4) and a heat exchanger I (5) are arranged. The air outlet of the heat exchanger I (5), cavity I of one grid-connection cabinet (1), the fan I (4), cavity I of the other grid-connection cabinet (1), and the air inlet of the heat exchanger I (5) form a first circulation air duct. On partition I (3), in the area corresponding to cavity II of the two grid-connection cabinets (1), a fan II (6) and a heat exchanger II (7) are arranged. The air outlet of the heat exchanger II (7), cavity II of one grid-connection cabinet (1), the fan II (6), cavity II of the other grid-connection cabinet (1), and the air inlet of the heat exchanger II (7) form a second circulation air duct.

2. The wind power grid-connected control cabinet according to claim 1, characterized in that, The stator-side devices include a stator-side contactor (8) and a stator-side external busbar assembly (9). The grid-side devices include a grid-side circuit breaker (10) and a grid-side external busbar assembly (11). The stator-side contactor (8) and the grid-side circuit breaker (10) inside a single grid-connection cabinet (1) are connected by a busbar III (12) passing through partition II (18).

3. The wind power grid-connected control cabinet according to claim 2, characterized in that, The stator-side external busbar assembly (9) includes several busbars I (91). The phase sequence arrangement direction of the several busbars I (91) is perpendicular to the flowing direction of the cooling air when it passes through the stator-side external busbar assembly (9). The intervals between adjacent busbars I (91) form channels for the cooling air to pass through.

4. The wind power grid connection control cabinet according to claim 3, characterized in that, The grid-side external busbar assembly (11) includes several busbars II (111). The phase sequence arrangement direction of the several busbars II (111) is perpendicular to the flowing direction of the cooling air when it passes through the grid-side external busbar assembly (11). The intervals between adjacent busbars II (111) form channels for the cooling air to pass through.

5. The wind power grid-connected control cabinet according to claim 4, wherein The wiring points I (92) on adjacent busbars I (91) are arranged in a staggered manner, and the wiring points II (112) on adjacent busbars II (111) are arranged in a staggered manner.

6. The wind power grid-connected control cabinet according to any one of claims 1-5, characterized in that, Both the heat exchanger I (5) and the heat exchanger II (7) are water-air heat exchangers and are connected to an external water-cooled heat exchange unit.

7. The wind power grid-connected control cabinet according to any one of claims 1-5, characterized in that, It also includes a control cabinet (2). The control cabinet (2) is separated from the two grid-connection cabinets (1). Inside the control cabinet (2), a heat exchanger III (17) is arranged. The heat exchanger III (17) is a water-air heat exchanger and is connected to an external water-cooled heat exchange unit.

8. The wind power grid-connected control cabinet according to claim 7, characterized in that, A transformer (13), a UPS power supply (14), two control components (15) and three filter components (16) are arranged in the control cabinet (2). The two control components (15) are correspondingly arranged at the upper and lower parts in the control cabinet (2). The heat exchanger III (17) is arranged between the two control components (15). One side and both ends of the two control components (15) are spaced from the inner side wall of the control cabinet (2). The transformer (13), the UPS power supply (14) and the three filter components (16) are located on the other side of the two control components (15). The UPS power supply (14) is located at the bottom in the control cabinet (2). The transformer (13) is located above the UPS power supply (14) and is centrally arranged in the control cabinet (2). The three filter components (16) are located above the UPS power supply (14) and are arranged in sequence along the height direction of the control cabinet (2).

9. The wind power grid-connected control cabinet according to any one of claims 2-5, characterized in that, The outgoing line position of the grid-side external busbar assembly (11) is at the top, front, back or side of the grid connection cabinet (1).

10. A wind power converter, characterized in that, A wind power grid connection control cabinet as described in any one of claims 1-9 is provided.

Images