CN201869082U - Power module system for air cooling current transformer - Google Patents

Abstract

Air-cooled converter power module system, including: The air-cooled converter power module system is a modular design, consisting of multiple single-arm power unit modules, system AC and DC busbars, and overall air ducts. The entire system includes: single The bridge arm power unit module (1), the module front air duct (2), the module rear air duct (3) and the low inductance stack composed of the system positive DC busbar (4) and the system negative DC busbar (5) A busbar, wherein the multiple single-arm power unit modules (1) are electrically connected through a low-inductance laminated busbar formed by a system positive DC busbar (4) and a system negative DC busbar (5). The utility model solves the problem that the inside of the power unit module is a bit messy due to many devices; multiple modules form a separate air duct in the space inside the cabinet to ensure the heat dissipation and the wind pressure loss as small as possible.

Description

Air Cooled Converter Power Module System

technical field

The utility model belongs to the technical field of semiconductor converters, and relates to a converter air-cooled power module system used in high-power converters.

Background technique

At present, high-power converters generally use a single converter bridge arm as a power unit module, which is assembled through external connections of the modules. At the same time, a single module is equipped with a single fan. The advantages of this mode are: flexible configuration, which can be configured as converters of different power levels through combination; modular structure, easy installation, and easy to achieve mass production. The disadvantages are: due to the large number of components, it is difficult to form an air duct after the centralized arrangement of the power module, and the heat generated by the loss of components is not easy to dissipate. Considering the safety insulation distance, the volume of power unit modules is generally too large, which is not suitable for industries limited by space such as the wind power industry.

Contents of the invention

Aiming at the above deficiencies, the utility model provides an air-cooled power module system suitable for megawatt-level high-power converters, which is characterized by: high voltage, high current, large power, small external radiation, high safety and reliability, easy installation Convenient and compact structure.

The utility model is realized through the following technical scheme: the air-cooled power module system is composed of multiple single-arm power unit modules, system AC and DC busbars, and an overall air duct (as shown in Figure 1). Specifically include: single-arm power unit module, module front air duct, module rear air duct, and low-inductance stacked busbars composed of the system positive DC busbar and system negative DC busbar. Among them, the system positive DC busbar, The negative DC busbars of the system are stacked and electrically isolated with high-voltage insulating PET paper in the middle; multiple single-arm power unit modules are electrically connected through the low-inductance laminated busbars composed of the system positive DC busbar and the system negative DC busbar. .

The single-arm power unit module forms a horizontal air duct through front and rear air ducts and an external centrifugal fan forms an insulated gate bipolar transistor IGBT (Insulated Gate Bipolar Transistor) air-cooled radiator cooling air duct; the cooling air duct is formed by a centrifugal fan outside the cabinet Independent of the cabinet space and parallel to the air duct of the module structure; the IGBT module with air-cooled radiator is placed on the bottom plate mounting plate of the single-arm power unit module, and the AC busbar is led out from the left side, and connected to the main circuit, while the bottom mounting plate is installed and fixed by slide rails; there are capacitor mounting holes on the bottom mounting plate, and the DC bus film capacitors are fixedly connected to it; The busbars are arranged in parallel and adopt the rear outlet method. There are 4 connectors on the left side of each of them. The connectors on the left side, the positive DC busbar of the module, and the negative DC busbar of the module are an integral busbar; the IGBT module and the positive DC busbar of the module The row and the negative DC busbar of the module are fixedly connected at the connector on the left by bolts, and the absorbing non-inductive capacitor is installed on the connection. The positive DC busbar of the module and the negative DC busbar of the module are folded inward at a 90° right angle on the rear side, and are parallel to the bottom mounting plate to form a space for installing the DC bus film capacitor, and at the same time form a cooling air duct for the DC bus film capacitor; multiple DC buses The positive and negative poles of the film capacitor are electrically connected through bolts on the capacitor installation holes opened by the module positive DC bus bar and the module negative DC bus bar. the

After adopting the above scheme, the utility model has the following advantages: it solves the problem that the interior of the power unit module is slightly messy due to the large number of devices; multiple modules form a separate air duct in the space inside the cabinet to ensure heat dissipation and minimize wind pressure loss ;The air duct design method of three modules from top to bottom facilitates the selection of power modules and the configuration of centrifugal fans according to the power level in the future, which enhances scalability and reliability; the air duct of the air-cooled radiator passes through the cabinet The openings at the corresponding positions on the body and the arrangement of the guide strips can flexibly control the wind pressure/air flow to meet the configuration requirements of modules of different power levels; no cables and wires are used to connect, which increases reliability; the DC support capacitor adopts Film capacitors have the advantages of low power loss and self-inductance, high anti-surge voltage, large ripple current, and long service life; and DC support capacitors use film capacitors with high voltage levels and do not need the voltage equalization used in parallel connection of traditional electrolytic capacitors The resistor simplifies the structure and eliminates the problem of capacitor failure caused by the voltage equalizing resistor; the absorbing non-inductive capacitor adopts a full parallel structure, and reserves a common interface to improve reliability and facilitate expansion; the backplane and the module use a pull-out type The guide rail installation method increases the convenience of maintenance and installation; this installation method is also convenient for integrating the DC CROWBAR structure.

Description of drawings

Fig. 1 is the front end schematic diagram of the present utility model;

Figure 2 is a schematic diagram of the rear end of the utility model;

Figure 3 is a schematic diagram of the appearance of the utility model;

Figure 4 is a schematic diagram of the positive and negative DC busbars of the system of the present invention;

Figure 5 is a top view of the single-arm power unit module of the present utility model;

Figure 6 is a front view of the single-arm power unit module of the present invention;

Figure 7 is a schematic diagram of the positive and negative DC busbars of the single-arm power unit module of the present invention.

Detailed ways

The utility model adopts the parallel structure of single bridge arm power modules, and the attached drawing 1 shows the parallel connection of six single bridge arm power modules (1) from top to bottom. As shown in Figure 3, all modules are connected in parallel through the system positive DC busbar (4) and the system negative DC busbar (5) to realize integrated installation. The air ducts of each power module are placed in parallel, and the installation distance of the front and rear air ducts (2) (3) is consistent with the distance between the front and rear doors, forming an air duct independent of the space in the cabinet. The centrifugal fan behind the cabinet forms a draft from front to back, with The calorific value of the module when the converter is running.

Each single-arm power module includes an IGBT module (6) with an air-cooled radiator, an AC busbar (7), an absorbing non-inductive capacitor (8), a module positive DC busbar (9), and a module negative DC busbar ( 10), film capacitor (11), air-cooled radiator air duct (12). Among them, the module positive DC busbar (9) and the module negative DC busbar (10) are opened according to the number of DC bus film capacitors (11) and the size of the copper bar leading out from the DC side of the power unit module. Laminated busbars, as shown in Figure 5, the module positive DC busbar (9) and the module negative DC busbar (10) are folded into a 90° right angle at the rear, which is used to install the system positive DC busbar (4) and the system negative DC busbar The low-inductance laminated busbars formed by combining rows (5). Place the DC bus film capacitor (11) under the DC stacked busbar of the single-arm power module. The positive and negative poles of the DC bus film capacitor (11) are connected to the module positive DC busbar (9) and the module negative DC busbar (10) through bolts. Connection; there are 4 connectors on the left side of the module positive DC busbar (9) and the module negative DC busbar (10), which are used to organically connect with the IGBT module (6) with an air-cooled radiator through bolts. Simultaneously connect the absorbing non-inductive capacitor (8) in parallel.

The IGBT module (6) with air-cooled radiator and the bottom mounting plate of the power module are fixed and installed through the pull-out guide rail; the left side of the AC busbar (7) is folded and opened for easy connection with the external copper bar; the AC busbar ( 7) The folding position can be adjusted due to the external main circuit wiring.

Claims (12)

1. The air-cooled converter power module system is characterized by: the air-cooled converter power module system is a modular design, consisting of multiple single-arm power unit modules, system AC and DC busbars, and the overall air duct. The system includes: a single-arm power unit module (1), a module front air duct (2), a module rear air duct (3) and a combination of the system positive DC busbar (4) and the system negative DC busbar (5) The low-inductance laminated busbar, in which multiple single-arm power unit modules (1) are electrically connected through the low-inductance laminated busbar composed of the system positive DC busbar (4) and the system negative DC busbar (5). . 2. The air-cooled converter power module system according to claim 1, characterized in that: the system positive DC busbar (4) and the system negative DC busbar (5) are arranged in layers, and high-voltage insulating PET paper is used in the middle for electrical insulation. isolation. 3. The air-cooled converter power module system according to claim 1, characterized in that: multiple single-arm power unit modules (1) pass through the module front air duct (2), and the module rear air duct (3) constitutes The cooling air duct is independent of the cabinet space. 4. The air-cooled converter power module system according to claim 1, characterized in that, the single-arm power unit module (1) includes: an IGBT module (6) with an air-cooled radiator, an AC bus row (7), absorbing non-inductive capacitor (8), module positive DC busbar (9), module negative DC busbar (10), DC bus film capacitor (11), air-cooled radiator air duct (12), of which , a plurality of DC busbar film capacitors (11) are connected to the module positive DC busbar (9) and the module negative DC busbar (9) through the capacitor installation holes opened on the module positive DC busbar (9) and the module negative DC busbar row (10) for electrical connection. 5. The air-cooled converter power module system according to claim 4, characterized in that: the DC bus film capacitor (11) is fixedly connected to the module bottom plate through the capacitor mounting hole opened on the module bottom mounting plate. 6. The air-cooled converter power module system according to claim 4, characterized in that: the stacked busbars composed of the module positive DC busbar (9) and the module negative DC busbar (10) are installed at the bottom The plates are arranged in parallel to form a cooling air duct for the DC bus film capacitor (11). 7. The air-cooled converter power module system according to claim 4, characterized in that: said air-cooled radiator air duct (12) is independent of the cabinet space and parallel to the module structure through a centrifugal fan outside the cabinet. air duct. 8. The air-cooled converter power module system according to claim 4, characterized in that: the air-cooled radiator air duct (12) is placed through openings and guide bars at corresponding positions on the cabinet body, so as to be able to The air pressure/air flow at the air inlet can be flexibly controlled. 9. The air-cooled converter power module system according to claim 4, characterized in that: the IGBT module (6) with an air-cooled radiator is installed on a base plate, and the base plate is installed and fixed by means of slide rails, At the same time, it is arranged in parallel with the laminated busbar composed of the module positive DC busbar (9) and the module negative DC busbar (10). A connector is connected to the IGBT module (6) with an air-cooled radiator, and the module positive DC busbar (9), the module negative DC busbar (10) and the connector are an integral busbar. 10. The air-cooled converter power module system according to claim 4, characterized in that: the absorbing non-inductive capacitor (8) connects the module positive DC busbar ( 9) Connect with the fixed bolts of the laminated busbar composed of the module negative DC busbar (10). 11. The air-cooled converter power module system according to claim 4, characterized in that: the absorbing non-inductive capacitor (8) adopts a full parallel structure and reserves a common interface. 12. The air-cooled converter power module system according to claim 4, characterized in that: the positive DC busbar (9) of the module and the negative DC busbar (10) of the module are rear outgoing lines, and the AC busbar ( 7) It is the way of outgoing line on the left side.

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