A three-phase bridge circuit direct cascaded modular multilevel converter

A modular multi-level, three-phase bridge technology, applied in the fields of HVDC, power electronics and power transmission, to achieve the effect of small capacitor voltage fluctuation, high power density and small number of sub-modules

Active Publication Date: 2022-03-01
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a three-phase bridge circuit direct cascaded modular multilevel converter, which solves the shortcomings of traditional converters

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  • A three-phase bridge circuit direct cascaded modular multilevel converter
  • A three-phase bridge circuit direct cascaded modular multilevel converter
  • A three-phase bridge circuit direct cascaded modular multilevel converter

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Embodiment Construction

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the application provided in conjunction with the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in ...

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Abstract

The invention relates to a three-phase bridge circuit direct cascading modular multilevel converter, comprising a three-phase bridge circuit direct cascading modular multilevel converter composed of multiple TPB-MMC sub-modules cascaded Inverter, TPB-MMC sub-module includes multiple sets of three-phase three-switch bridge circuits and capacitors, each set of three-phase three-switch bridge circuits is connected in parallel with capacitors; each set of three-phase three-switch bridge circuits includes multiple semiconductors connected in series A series branch composed of switches and two inductors, the series branch is connected in parallel with the capacitor, and an inductor is connected between the two semiconductor switches in the series branch; multiple semiconductor switches in the series branch can only be turned off at the same time and cannot be turned on at the same time Different operating states are selected by selecting the on-off states of multiple semiconductor switches in the series branches in each group of three-phase three-switch bridge circuits. The invention has the advantages of high modularization degree, less number of sub-modules at the same voltage level, small capacitor voltage fluctuation, small capacity and high power density.

Description

technical field [0001] The invention relates to the fields of power electronics, power transmission, and high-voltage direct current transmission, in particular to a three-phase bridge circuit direct cascading modular multilevel converter. Background technique [0002] Modular multilevel converters have been widely used in the fields of high-voltage direct current transmission, medium-voltage direct current grids and high-voltage inverters; modular multilevel converters are one of the most effective means to convert high-voltage direct current and high-voltage alternating current , a large number of people have studied it; however, traditional modular multilevel converters are based on half-bridge or full-bridge converters, and single-phase sub-modules are connected in series to form a single-phase system, and then through three single-phase The systems are combined in parallel to form a three-phase system. In a single-phase system, AC-DC conversion inevitably has double-fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H02M7/483H02M7/5387H02M7/521H02M1/14
CPCH02M7/00H02M7/483H02M7/53871H02M7/521H02M1/14
Inventor 马俊鹏王顺亮张芮刘天琪
Owner SICHUAN UNIV
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