CN204304765U - Medium voltage converter cabinet power cell - Google Patents

Abstract

The utility model discloses a power unit structure for a frequency conversion cabinet, in particular to a medium-voltage frequency conversion cabinet power unit using an air-cooled radiator for heat exchange. It includes a housing, which is divided into two left and right cavities by a partition, one of which is a power unit room, and a TGBT module and a rectifier unit are installed above the power unit room, and a radiator is arranged below the TGBT module and the rectifier unit. Composite busbars are installed on the module, absorption capacitors are installed on the composite busbars, support capacitors are installed in the other chamber, and control circuit boards are installed above the support capacitors. After the above-mentioned structure is adopted, the forced air cooling inside the power unit is realized, the heat of the busbar and the capacitor body is reduced, and the damage of the power device is reduced. The air cooling cycle is formed inside the wind-medium voltage frequency conversion cabinet, which reduces the damage of power unit devices and reduces the company's on-site maintenance costs.

Description

Medium voltage frequency conversion cabinet power unit

technical field

The utility model relates to a power unit structure for a frequency conversion cabinet, in particular to a medium-voltage frequency conversion cabinet power unit using an air-cooled radiator for heat exchange.

Background technique

In the medium-voltage frequency conversion cabinet, the power unit part is a structure independent of the cabinet body, and the heating device and power unit part in the cabinet complete heat exchange through the fan, so as to achieve the purpose of heat dissipation; as the core of the medium-voltage frequency conversion cabinet, the power Generally, only the IGBT module and the rectifier bridge are cooled during unit design, and other components such as capacitors and busbars are not considered for heat dissipation due to their small heat generation relative to the IGBT module.

In actual operation, the complex and changeable on-site operating conditions and the airtight structure of the frequency conversion cabinet prevent the heat from the IGBT module from being completely taken away, and the heat generated inside the power unit gradually accumulates. Capacitors also generate heat. When the heat accumulates to a certain extent, it will affect the performance of the DC support capacitor and even damage the device.

Contents of the invention

The technical problem to be solved by the utility model is that, under the condition that the traditional power unit uses air-cooled heat dissipation, the main loss parts (IGBT module and rectifier bridge) are solved at the same time for heat dissipation treatment, so that forced air cooling is formed inside the power unit, reducing busbars, The heat of the capacitor body and the power unit of the medium-voltage frequency conversion cabinet that reduce the damage of the power device.

In order to solve the above-mentioned technical problems, the power unit of the medium-voltage frequency conversion cabinet of the present utility model includes a housing, and the housing is divided into two cavities on the left and right by a partition, one of which is a power unit room, and a TGBT module is installed above the power unit room And the rectifier unit, the TGBT module and the rectifier unit are provided with a radiator, the composite busbar is installed on the TGBT module, the absorption capacitor is installed on the composite busbar, the support capacitor is installed in the other chamber, and the control circuit board is installed above the support capacitor.

One side of the supporting capacitor is also provided with a control transformer.

After adopting the above structure, when the power unit is placed inside the medium-voltage inverter cabinet, since the three phases A, B, and C are installed from top to bottom, only a fan needs to be installed on the top to form a circulation inside the inverter cabinet. Air circuit, under the air-cooled conditions of the IGBT module and the rectifier bridge, other components including capacitors and busbars can also be heat exchanged through circulating air cooling; thus, forced air cooling is realized inside the power unit, reducing the cost of busbars and capacitors. The heat of the component body and the purpose of reducing the damage of the power device are compact in structure, easy to install, and make the heat dissipation of the internal device of the power unit more effective, so that the air cooling cycle is formed inside the wind-medium voltage frequency conversion cabinet, which reduces the damage of the power unit device and reduces the Company on-site maintenance costs.

Description of drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the power unit of the medium-voltage frequency conversion cabinet of the present invention.

Detailed ways

The power unit of the medium-voltage frequency conversion cabinet of the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

As shown in the figure, the power unit of the medium-voltage frequency conversion cabinet of the utility model includes a housing 1, which is divided into two left and right chambers by a partition, one of which is a power unit chamber, and a TGBT is installed above the power unit chamber Module 2 and rectifier unit 3, composite busbar 7 is installed on TGBT module 2, absorption capacitor 8 is installed on composite busbar 7, radiator 4 is arranged under TGBT module 2 and rectifier unit 3, radiator 4 is used for IGBT module and The heat exchange of the rectifier unit and the heat dissipation of the entire right chamber mainly rely on the radiator for heat exchange; the support capacitor 5 is installed in the other chamber, that is to say, the support capacitor 5 is separated from the main loss components; the support capacitor 5 is installed above the The control circuit board 6 is also provided with a control transformer 9 on one side of the support capacitor 5; when the power unit is placed inside the medium-voltage frequency conversion cabinet, since the three phases A, B, and C are installed from top to bottom, only the A fan is installed on the top to form a circulating air path inside the inverter cabinet. Under the condition of air-cooling the IGBT module and rectifier bridge, other components including capacitors and busbars can also perform heat exchange through circulating air cooling.

Claims (2)

1. a medium voltage converter cabinet power cell, it is characterized in that: comprise housing (1), described housing (1) becomes two cavitys in left and right by baffle for separating, one of them chamber is power cell room, TGBT module (2) and rectification unit (3) are installed above power cell room, TGBT module (2) and rectification unit (3) below are provided with radiator (4), TGBT module (2) is provided with composite bus bar (7), composite bus bar (7) is installed Absorption Capacitance (8), another one chamber indoor location Support Capacitor (5), control circuit board (6) is installed in Support Capacitor (5) top.

2. according to medium voltage converter cabinet power cell according to claim 1, it is characterized in that: the side of described Support Capacitor (5) is also provided with control transformer (9).