CN204376690U - Power cabinet and current transformer - Google Patents

Abstract

The utility model provides a power cabinet and a converter. The power cabinet includes: a cabinet, a power module and a controller. The power module and the controller are electrically connected and are both arranged in the cabinet; an AC bus is provided on the cabinet. interface and DC bus interface, the power module is electrically connected to the AC bus interface and DC bus interface respectively, and is used to electrically connect to peripheral systems or other power cabinets through the AC bus interface or DC bus interface. It has independent power module functions and does not depend on peripheral systems, thereby reducing the workload of peripheral system design, shortening the development cycle, and having the advantage of being able to achieve compatibility with a variety of power modules.

Description

Power Cabinet and Converter

technical field

The utility model relates to the technical field of power electronics, in particular to a power cabinet and a converter.

Background technique

Wind power technology has developed rapidly in my country in recent years, and the capacity of a single wind turbine has become larger and larger, and the capacity of the associated converter has also been increased accordingly and is constantly developing in the direction of high power density.

The core unit of the converter is a power module based on the design of an insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor)/integrated gate commutated thyristor (IGCT, Integrated Gate Commutated Thyristor), and its peripheral system includes filtering made around the power module Circuits, protection circuits, busbar systems, heat dissipation systems, control systems and cabinets and other structures. The current converters mainly use the power module as a unit to design the peripheral system, the design workload is heavy, the cycle is long, and the interface relationship between the power module and the peripheral system is complicated, and the power modules produced by different manufacturers are different on the interface. It is difficult to unify, which leads to the simplification of the selection of power modules, which determines the single design direction of the converter.

When designing a converter to increase capacity, it is necessary to select a new module and redesign the peripheral system according to the requirements of the new module, which is equivalent to redesigning the converter, and the development cycle is long.

Utility model content

The purpose of this utility model is to provide a power cabinet and converter that is independent in function, does not depend on the peripheral system, and can realize the compatibility of various power modules, so as to solve the problem of heavy peripheral system design workload, long development cycle, and poor module compatibility. The problem.

In order to achieve the above object, the technical solution adopted in the utility model is:

A power cabinet, comprising: a cabinet body, a power module, and a controller, the power module and the controller are electrically connected and both are arranged in the cabinet body;

The cabinet body is provided with an AC bus interface and a DC bus interface, and the power module is electrically connected to the AC bus interface and the DC bus interface, so as to communicate with the AC bus interface or the DC bus interface through the AC bus interface or the DC bus interface. Peripheral system electrical connection.

Preferably, the AC bus interface includes a rectification-side AC bus interface and/or an inverter-side AC bus interface.

Preferably, a first guide rail is arranged on the inner wall of the cabinet, and the power module is arranged on the first guide rail and can slide on the first guide rail.

Preferably, a second guide rail is provided on the inner wall of the cabinet, and the controller is arranged on the second guide rail and slides on the second guide rail.

Preferably, the power modules are single-phase power modules and the number is a multiple of three, or are three-phase power modules.

Preferably, the power cabinet further includes a water cooling system, and the water cooling system includes a water inlet pipe and a water outlet pipe;

The water inlet pipe communicates with the external cooling medium source and the water cooling plate of the power module respectively, and the water outlet pipe communicates with the water cooling plate of the power module;

The cooling medium flows into the water cooling plate of the power module through the water inlet pipe, and is discharged through the water outlet pipe to cool the power module.

Preferably, the power cabinet further includes a heat exchange system in the cabinet, and the heat exchange system in the cabinet includes a fan and a water-air heat exchanger;

The water-wind heat exchanger communicates with the water inlet pipe and the water outlet pipe respectively, so as to allow the cooling medium to circulate in the water-wind heat exchanger;

The air blown by the fan passes through the water-air heat exchanger, and flows to the power module after being cooled by the water-air heat exchanger, so as to cool the power module.

Preferably, the inside of the cabinet is provided with an air equalizing plate, and the air equalizing plate is provided with air equalizing holes, the number of the air equalizing holes is the same as that of the power module, and the same as the power module One correspondence; used to adjust the flow of air flowing through each of the power modules.

Preferably, the power cabinet further includes a heat exchange system in the cabinet, and the heat exchange system in the cabinet includes a fan, and the fan blows air to the power module to cool the power module.

Preferably, the inside of the cabinet is provided with an air equalizing plate, and the air equalizing plate is provided with air equalizing holes, the number of the air equalizing holes is the same as that of the power module, and the same as the power module One correspondence; the air equalizing plate is used to adjust the air flow passing through each of the power modules.

A converter, including a peripheral system and a power cabinet with any of the above technical features;

The power cabinet is electrically connected to the peripheral system through the AC bus interface or the DC bus interface.

Preferably, the number of the power cabinets is two or more;

The two or more power cabinets are sequentially connected in series through the AC bus interface or the DC bus interface.

Preferably, the power cabinets include a water cooling system, and the water cooling systems of the two or more power cabinets are connected in sequence.

The beneficial effects of the utility model are: the power module is independent in function and does not depend on peripheral systems, thereby reducing the workload of peripheral system design, shortening the development cycle, and realizing the compatibility of various power modules.

Description of drawings

Fig. 1 is a schematic structural diagram of a power cabinet in Embodiment 1;

Fig. 2 is a schematic structural diagram of a power cabinet in which the power module is a three-phase power module;

Fig. 3 is a schematic diagram of the first guide rail in the power cabinet in Embodiment 1;

Fig. 4 is the schematic diagram of the water cooling system of the power cabinet in the second embodiment;

5 is a schematic diagram of the heat exchange system in the power cabinet in Embodiment 2;

Fig. 6 is a schematic diagram of the air equalizing plate in Fig. 5;

7 is a schematic diagram of the heat exchange system in the power cabinet in Embodiment 3;

Fig. 8 is a schematic structural diagram of the converter in the fourth embodiment.

Among them: 1-power cabinet; 2-cabinet body; 3-power module; 4-controller; 5-AC bus interface; 6-DC bus interface; 7-first guide rail; 8-single-phase power module; 9-three Phase power module; 10-water inlet pipe; 11-water outlet pipe; 12-water cooling plate; 13-fan; 14-water-air heat exchanger; -Peripheral systems.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the power cabinet and the converter of the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment one

As shown in Figure 1, a power cabinet 1 includes: a cabinet body 2, a power module 3 and a controller 4, the power module 3 and the controller 4 are electrically connected, and both are arranged in the cabinet body 2, and the cabinet body 2 is provided with There are AC bus interface 5 and DC bus interface 6, and the power module 3 is electrically connected to the AC bus interface 5 and/or the DC bus interface 6, so as to communicate with the peripheral system or other power through the AC bus interface 5 and/or the DC bus interface 6. cabinet electrical connections.

Among them, the power modules 3 are single-phase power modules 8, and the number is a multiple of three. The controller 4 adopts a distributed control method, that is, it is electrically connected to each single-phase power module 8 to realize real-time monitoring of the single-phase power modules 8. Control and quick protection. As a possible implementation, as shown in FIG. 2 , the power module 3 may also be a three-phase power module 9 , and the control principle of the controller for the three-phase power module 9 is the same as that for controlling the single-phase power module 8 . The power module 3 is electrically connected to the AC bus interface 5 and the DC bus interface 6 respectively, so as to be connected to the peripheral system through the AC bus interface 5 or the DC bus interface 6 . Both the AC bus interface 5 and the DC bus interface 6 adopt standard interfaces, which are convenient for electrical connection with peripheral systems. The AC bus interface 5 includes the AC bus interface on the rectification side and the AC bus interface on the inverter side, so that rectification and inverter functions can be completed according to different wiring modes.

By adopting the above technical solution, the power cabinet 1 can be compatible with different types of power modules 3 and can adapt to different peripheral systems. The electrical connection between the power cabinet 1 and the peripheral system can be realized only through the AC bus interface 5 or the DC bus interface 6, and the peripheral system does not need to carry out complicated design according to the power module 3, which greatly shortens the development cycle and has a high development success rate .

Preferably, as shown in FIG. 3 , a first guide rail 7 is arranged on the inner wall of the cabinet body 2 , and the power module 3 is arranged on the first guide rail 7 and can slide on the first guide rail 7 . Further, a second guide rail (not shown in the figure) is arranged on the inner wall of the cabinet body 2, and the controller 4 is arranged on the second guide rail and slides on the second guide rail.

In this way, both the power module 3 and the controller 4 are installed in the cabinet body 2 through the first guide rail 7 and the second guide rail by adopting a drawer push-pull structure, which provides convenience for the maintenance work of the power module 3 and the controller 4 .

Embodiment two

As shown in Figure 4, the power cabinet 1 in this embodiment has all the technical features of the power cabinet 1 described in the first embodiment, and the difference from the power cabinet 1 in the first embodiment is that, as shown in Figure 4 , the power cabinet 1 in this embodiment also includes a water cooling system, the water cooling system includes a water inlet pipe 10 and a water outlet pipe 11, the water inlet pipe 10 communicates with the external cooling medium source and the water cooling plate 12 of the power module 3, and the water outlet pipe 11 communicates with the power module 3 The water cooling plate 12 of 3 is connected, the cooling medium flows into the water cooling plate 12 of the power module 3 through the water inlet pipe 10, and is discharged through the water outlet pipe 11 to cool the power module 3 and take the heat inside the cabinet 2 out of the cabinet 2 external.

Wherein, the external cooling medium source can be a water pump, the cooling medium can be water, and the water cooling plate 12 of the power module 3 can communicate with the water inlet pipe 10 and the water outlet pipe 11 in a conventional way (such as through a hose). In this way, the power cabinet 1 can be equipped with a relatively independent cooling system, which can prevent the power module 3 from being damaged due to overheating.

Preferably, as shown in FIG. 5 , the power cabinet 1 also includes a heat exchange system in the cabinet. The heat exchange system in the cabinet includes a fan 13 and a water-air heat exchanger 14. The fan 13 and the water-air heat exchanger 14 can be set at the power Below the module 3, the water-wind heat exchanger 14 communicates with the water inlet pipe 10 and the water-wind heat exchanger 11 respectively to allow the cooling medium to circulate in the water-wind heat exchanger 14, and the fan 13 blows air through the water-wind heat exchanger 14, After being cooled by the water-air heat exchanger 14 , it flows to the power module 3 for cooling the power module 3 .

The water-air heat exchanger 14 may be a mesh structure composed of interconnected steel pipes, the cooling medium flows through the steel pipes and absorbs the heat of the air flowing through the water-air heat exchanger 14 . The fan 13 blows air through the mesh of the water-air heat exchanger 14 , and the air flows to the power module 3 after the heat is absorbed by the cooling medium inside the steel pipe, which can improve the cooling effect of the air on the power module 3 .

More preferably, as shown in Fig. 5 and Fig. 6, an air equalizing plate 15 is arranged inside the cabinet body 2, and an air equalizing hole 16 is arranged on the air equalizing plate 15, and the number of the air equalizing holes 16 is the same as that of the power modules 3, And one-to-one correspondence with the power modules 3; used to adjust the flow of air flowing through each power module 3.

The return air channel 17 is formed between the air equalizing plate 15 and the inner wall of the cabinet body 2, and the air blown by the fan flows through the water-wind heat exchanger 14 and then flows to the power module 3, and then enters the return air channel 17 through the air equalizing hole 16, and flows Return fan, forming a cycle. The number of equalizing holes 16 is the same as the number of power modules 3, and corresponds to the power modules 3 one-to-one, so that the air flow through each power module 3 can be roughly the same, so that the fans can operate on all power modules 3. Air-cooled, to avoid air-cooled dead ends.

Embodiment three

As shown in FIG. 7 , the power cabinet 1 also includes a heat exchange system inside the cabinet. The heat exchange system inside the cabinet includes a fan 13 , and the fan 13 blows air to the power module 3 for cooling the power module 3 .

The difference between the power cabinet 1 in this embodiment and the second embodiment is that the heat exchange system in the cabinet does not include the water-air heat exchanger 14, but the fan 13 is used to directly blow air to the power module 3 to cool the power module 3 by air. , this method is simple in structure and low in cost. The power cabinet 1 in this embodiment can also adjust the air flow through each power module 3 by installing an air equalizing plate 15. The structure of the air equalizing plate 15 and the principle of adjusting the air flow are the same as those described in the second embodiment. They are exactly the same and will not be described in detail here.

Embodiment four

As shown in FIG. 8 , a converter includes a peripheral system 18 and the power cabinet 1 described in any of the above embodiments. The power cabinet 1 is electrically connected to the peripheral system through an AC bus interface or a DC bus interface. Preferably, the number of power cabinets is two or more, and two or more power cabinets 1 are sequentially connected in series through the AC bus interface or the DC bus interface. The converter can be replaced with the power cabinet 1 as a unit to be compatible with different power modules, which has changed the problem of single power module selection in the past converter design.

As a possible implementation manner, the power cabinet 1 includes a water cooling system, and the water cooling systems of two or more power cabinets 1 are connected in sequence.

The power cabinet 1 includes the water inlet pipe 10 and the water outlet pipe 11 as described in the second embodiment. When two or more power cabinets 1 are connected in series through the AC bus interface or the DC bus interface, the water outlet pipe of the power cabinet 1 11 can communicate with the water inlets of adjacent power cabinets 1 to realize the sequential connection of the water cooling systems of multiple power cabinets 1, and the external cooling medium source can cool the power modules 3 in multiple power cabinets 1 in sequence.

The above embodiments enable the utility model to have the advantages that the power module has independent functions and does not depend on peripheral systems, thereby reducing the workload of peripheral system design, shortening the development cycle, and realizing the advantages of compatibility of various power modules.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (13)

1. A power cabinet, characterized in that: The power cabinet (1) includes: a cabinet body (2), a power module (3) and a controller (4), the power module (3) and the controller (4) are electrically connected, and are all arranged in the In the cabinet body (2); The cabinet (2) is provided with an AC bus interface (5) and a DC bus interface (6), and the power module (3) is connected to the AC bus interface (5) and the DC bus interface (6) respectively The electrical connection is used for electrical connection with peripheral systems through the AC bus interface (5) or the DC bus interface (6). 2. The power cabinet according to claim 1, characterized in that: The AC bus interface (5) includes a rectification-side AC bus interface and/or an inverter-side AC bus interface. 3. The power cabinet according to claim 2, characterized in that: A first guide rail (7) is arranged on the inner wall of the cabinet body (2), and the power module (3) is arranged on the first guide rail (7) and can slide on the first guide rail (7) . 4. The power cabinet according to claim 2, characterized in that: A second guide rail is arranged on the inner wall of the cabinet, and the controller (4) is arranged on the second guide rail and slides on the second guide rail. 5. The power cabinet according to claim 2, characterized in that: The power modules (3) are single-phase power modules (8) and the number is a multiple of three, or are three-phase power modules (9). 6. The power cabinet according to any one of claims 1 to 5, characterized in that: The power cabinet (1) also includes a water cooling system, and the water cooling system includes a water inlet pipe (10) and a water outlet pipe (11); The water inlet pipe (10) communicates with the external cooling medium source and the water cooling plate (12) of the power module (3) respectively, and the water outlet pipe (11) communicates with the water cooling plate (12) of the power module (3) connected; The cooling medium flows into the water cooling plate (12) of the power module (3) through the water inlet pipe (10) and is discharged through the water outlet pipe (11) to cool the power module (3). 7. The power cabinet according to claim 6, characterized in that: The power cabinet (1) also includes a heat exchange system in the cabinet, and the heat exchange system in the cabinet includes a fan (13) and a water-air heat exchanger (14); The water-wind heat exchanger (14) communicates with the water inlet pipe (10) and the water outlet pipe (11) respectively, so as to allow the cooling medium to circulate in the water-wind heat exchanger (14); The air blown by the fan (13) passes through the water-wind heat exchanger (14), and flows to the power module (3) after being cooled by the water-wind heat exchanger (14), so as to control the power The modules (3) are cooled. 8. The power cabinet according to claim 6, characterized in that: The inside of the cabinet (2) is provided with an air uniform plate (15), and the air uniform plate (15) is provided with an air uniform hole (16), and the number of the air uniform hole (16) is the same as that of the power module (3) have the same number and correspond to the power modules (3) one by one; they are used to adjust the air flow through each of the power modules (3). 9. The power cabinet according to any one of claims 1 to 5, characterized in that: The power cabinet (1) also includes a heat exchange system in the cabinet, and the heat exchange system in the cabinet includes a fan (13), and the fan (13) blows air to the power module (3) to The power module (3) is cooled. 10. The power cabinet according to claim 9, characterized in that: The inside of the cabinet (2) is provided with an air uniform plate (15), and the air uniform plate (15) is provided with an air uniform hole (16), and the number of the air uniform hole (16) is the same as that of the power module (3) have the same number and correspond to the power modules (3) one by one; the air equalizing plate (15) is used to adjust the air flow passing through each of the power modules (3). 11. A converter, characterized in that: Comprising a peripheral system (18) and the power cabinet (1) described in any one of claims 1 to 10; The power cabinet (1) is electrically connected to the peripheral system (18) through the AC bus interface (5) or the DC bus interface (6). 12. The converter according to claim 11, characterized in that: The number of the power cabinets (1) is two or more; The two or more power cabinets (1) are sequentially connected in series through the AC bus interface (5) or the DC bus (6) interface. 13. The converter according to claim 12, characterized in that: The power cabinet (1) includes a water cooling system, and the water cooling systems of the two or more power cabinets (1) are connected in sequence.