CN102931820A - Capacitive heat-dissipation power unit for wind power converter - Google Patents

Abstract

The invention relates to a power unit structure for a wind power converter, and particularly relates to a capacitive heat-dissipation power unit for a wind power converter. The capacitive heat-dissipation power unit comprises a shell; an inner cavity of the shell is divided into a front part and a rear part through a partition board; a water cooling board is mounted on the front face of the partition board; an IGBT (Insulated Gate Bipolar Translator) module is mounted on the water cooling board; a capacitive bus bar is mounted on the back face of the partition board through insulators; direct-current thin film capacitors are mounted on the capacitive bus bar; and air-cooling radiator substrates are connected with the outer sides of the direct-current thin film capacitors. The power unit structure provided by the invention is additionally provided with air cooling radiators and cooling air ducts for enhancing a cooling effect on the direct-current thin film capacitors on the basis of the conventional power unit, so that the heat dissipation capability of the power unit is greatly improved, and the stable and reliable operation of the wind power equipment can be ensured.

Description

Capacitor cooling type power unit for wind power converter

technical field

The invention relates to a power unit structure used in a wind power converter, in particular to a capacitor cooling type power unit for a wind power converter.

Background technique

In the wind power converter, the power unit part is a structure independent of the cabinet body, and the heating device and the power unit part in the cabinet complete heat exchange through circulating water, so as to achieve the purpose of heat dissipation. As the core of the wind power converter, the power unit is generally only designed to cool the IGBT module, 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.

However, in the actual operation of the wind farm, the site operating conditions are complex and changeable, and the structure of the wind tower and the converter is closed, so that the heat of the IGBT module cannot be completely taken away, and the heat generated inside the power unit gradually accumulates. At the same time, other components inside the power unit For example, laminated busbars and capacitors will 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 present invention is to provide a capacitive heat dissipation power unit for wind power converters with strong heat dissipation capability and good reliability in use.

The capacitive cooling type power unit for wind power converters of the present invention includes a housing, the inner cavity of the housing is divided into front and rear parts by a partition; a water-cooled plate is installed on the front of the partition, and an IGBT module is installed on the water-cooled board; The insulator is equipped with a capacitor busbar, and a DC film capacitor is installed on the capacitor busbar, and an air-cooled radiator substrate is connected to the outside of the DC film capacitor.

Parallel heat dissipation fins are arranged on the back of the air-cooled radiator substrate, and a cover plate is arranged outside the air-cooled radiator substrate. A heat dissipation air channel is formed between the air-cooled radiator substrate and the cover plate, and the heat dissipation fins are longitudinally located in the heat dissipation air channel.

On the basis of the traditional power unit structure, the invention adds an air-cooled radiator and a heat dissipation air duct for enhancing heat dissipation of the DC film capacitor, greatly improving the heat dissipation capacity of the power unit and ensuring the stable and reliable operation of the wind power equipment.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways

As shown in the figure, the capacitive cooling type power unit for wind power converter of the present invention includes a housing 1, and the inner chamber of the housing is divided into front and rear parts by a partition 2; a water cooling plate 3 is installed on the front of the partition, and a There is an IGBT module 4; a capacitor bus 6 is installed on the back of the partition through an insulator 5, a DC film capacitor 7 is installed on the capacitor bus, and an air-cooled radiator substrate 8 is connected to the outside of the DC film capacitor. Parallel heat dissipation fins 9 are arranged on the back of the air-cooled radiator substrate 8, and a cover plate 10 is arranged on the outside of the air-cooled radiator substrate 8. A heat dissipation air duct 11 is formed between the air-cooled radiator substrate 8 and the cover plate 10, and the heat dissipation fins 9 are vertically Located in the cooling air duct.

Claims (2)

1. A capacitive heat dissipation power unit for wind power converters, comprising a housing (1), characterized in that: the inner chamber of the housing is divided into two parts by a partition (2); the front of the partition is equipped with a water cooling plate ( 3), the IGBT module (4) is installed on the water-cooled plate; the capacitor busbar (6) is installed on the back of the partition through the insulator (5), the DC film capacitor (7) is installed on the capacitor busbar, and the DC film capacitor is connected to the outside Air-cooled radiator base plate (8). 2. The capacitive cooling type power unit for wind power converter according to claim 1, characterized in that parallel cooling fins (9) are arranged on the back of the air-cooled radiator substrate (8), and the air-cooled radiator substrate (8) A cover plate (10) is arranged on the outside, and a heat dissipation air duct (11) is formed between the air-cooled radiator base plate (8) and the cover plate (10), and the heat dissipation fins (9) are longitudinally located in the heat dissipation air duct.

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