Sub-module circuit for three-phase modular multilevel converter

A three-phase module and sub-module technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., to achieve the effect of facilitating unified production, reducing volume and cost, and reducing volume

Inactive Publication Date: 2020-03-24
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current existing technology cannot effectively reduce the number of capacitors in modular multilevel converters, and capacitors have become a bottleneck restricting the development of modular multilevel converter technology

Method used

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  • Sub-module circuit for three-phase modular multilevel converter
  • Sub-module circuit for three-phase modular multilevel converter
  • Sub-module circuit for three-phase modular multilevel converter

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific examples.

[0019] Such as figure 1 As shown, the sub-module circuit for the three-phase modular multilevel converter provided in this embodiment includes: 2 energy storage capacitors, respectively the first capacitor C 1 , the second capacitance C 2 , 6 power diodes, respectively the first diode D 1 , the second diode D 2 , the third diode D 3 , the fourth diode D 4 , the fifth diode D 5 , the sixth diode D 6 , 12 power switch tubes with reverse diodes, respectively the first switch tube T 1 , the second switching tube T 2 , the third switching tube T 3 , the fourth switching tube T 4 , the fifth switching tube T 5 , the sixth switching tube T 6 , the seventh switching tube T 7 , the eighth switching tube T 8 , the ninth switching tube T 9 , the tenth switching tube T 10 , the eleventh switching tube T 11 and the twelfth switching tube T 12 ; The first capacitance C 1 ...

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Abstract

The invention discloses a sub-module circuit for a three-phase modular multilevel converter. The sub-module circuit is composed of two energy storage capacitors, twelve power switch tubes with reversediodes and six power diodes. When the sub-module circuit replaces six half-bridge type sub-modules close to the positive electrode of the direct current side, a first capacitor of the sub-module circuit is connected with one ends of collectors of a first switch tube, a second switch tube and a third switch tube to be connected with the positive electrode of the direct current side, and emitters of a fourth switch tube, a fifth switch tube and a sixth switch tube are connected with the remaining sub-modules of the three-phase modular multilevel converter. And when the sub-module circuit replaces six half-bridge sub-modules close to the cathode of the direct current side, the second capacitor is connected with one end of emitters of the tenth, eleventh and twelfth switching tubes to be connected with the cathode of the direct current side, and emitters of the fourth, fifth and sixth switching tubes are respectively connected with the remaining sub-modules of the three-phase modular multilevel converter. Under the condition that original functions are kept unchanged, the number of capacitors can be reduced by four, and the size and cost of the converter are reduced.

Description

technical field [0001] The invention relates to the technical field of modular multilevel converters, in particular to a sub-module circuit for three-phase modular multilevel converters. Background technique [0002] In order to meet the requirements of large-capacity power transmission and enhance the controllability of the power grid, flexible DC transmission technology is showing a momentum of rapid development. As the core technology of the flexible DC transmission project, the modular multilevel converter (MMC) has been widely used. Existing MMC converters, especially in the high-voltage field, are mostly hybrid MMC converters including various sub-modules. In the whole MMC converter, half-bridge sub-modules account for a larger part. Although compared with traditional rectifiers and inverters, modular multilevel converters have the advantages of modularization, low switching frequency, small switching losses, and low voltage stress on switching devices, but the appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H02M7/483H02M7/493H02M7/5387
CPCH02M7/00H02M7/483H02M7/493H02M7/53871H02M7/4835
Inventor 傅闯张波曹琬钰黄润鸿陈垣丘东元饶宏李立浧
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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