Four-quadrant three-level power unit and high-voltage inverter

A power unit and three-level inverter technology, which is applied in the field of high-voltage inverters, can solve problems such as insufficient output voltage of power units, and achieve the effects of reduced quantity, high reliability and long life

Inactive Publication Date: 2013-04-10
SUZHOU INOVANCE TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a four-quadrant three-level power ...

Method used

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  • Four-quadrant three-level power unit and high-voltage inverter
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  • Four-quadrant three-level power unit and high-voltage inverter

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Embodiment Construction

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] Such as Figure 4 Shown is a schematic diagram of an embodiment of a four-quadrant three-level power unit of the present invention. In this embodiment, the power unit includes a three-phase three-level rectifier bridge 51 respectively connected to the DC bus, a DC filter circuit 52 composed of voltage equalizing resistors and DC support capacitors C1 and C2, a single-phase three-level inverter bridge 54 and a bypass module 55, wherein the three-phase three-level rectifier bridge 51 and the single-phase three-level inverter bridge 54 are connected back to back. The three-phase three-level rectifier bridge 51 includes three-phase first bridge arms, and each phase first bridge arm includes four power switch tubes V...

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Abstract

The invention relates to a four-quadrant three-level power unit. The four-quadrant three-level power unit is characterized in that the four-quadrant three-level power unit comprises three-phase three-level rectifier bridges which are respectively connected to a DC (direct current) bus, equalizing resistances, DC-link capacitor modules and single-phase three-level inverter bridges, wherein the three-phase three-level rectifier bridges and the single-phase three-level inverter bridges are connected back to back, each of the three-phase three-level rectifier bridges includes three phases first bridge arms and each of the three phases first bridge arms includes four power switch tubes, antiparallel follow current power tubes and two clamping modules, and each of the center taps of the clamping modules is connected to each of the center taps of the DC-link capacitor modules. The invention also provides a high-voltage inverter including the four-quadrant three-level power unit. The four-quadrant three-level power unit utilizes the three-level topological structure to enable the output voltage of the power unit to be increased substantially, so that the amount of the power units which are in overall unit series with the high-voltage inverter can be decreased substantially and the overall unit is high in reliability and long in service life.

Description

technical field [0001] The invention relates to the field of high-voltage frequency converters, and more specifically relates to a four-quadrant three-level power unit and a high-voltage frequency converter. Background technique [0002] With the development of electric transmission technology, especially frequency conversion speed regulation technology, high-voltage frequency converter technology as a large-capacity transmission has also been widely used. The high-voltage motor can realize stepless speed regulation by using a high-voltage frequency converter, which meets the requirements of the production process for motor speed regulation and control, so as to improve the output and quality of products. In addition, the use of electric motors can greatly save energy and reduce production costs. [0003] The power unit series multi-level high-voltage inverter is currently the most popular technical solution for domestic manufacturers. It sets an input isolation transformer...

Claims

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Application Information

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IPC IPC(8): H02M5/45
Inventor 陈实刘宇川冷严冬翁翔羿
Owner SUZHOU INOVANCE TECH CO LTD
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