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A low-loss modular multilevel converter and its parameter design method

A modular multi-level converter technology, applied in AC power input conversion to DC power output, instrumentation, computing, etc., can solve the problems of increasing system conduction loss and resource loss, and achieve reduction of conduction loss, Effect of reducing voltage stress

Active Publication Date: 2020-11-24
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This additional switching device will increase the conduction loss of the system, resulting in the loss of resources

Method used

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  • A low-loss modular multilevel converter and its parameter design method
  • A low-loss modular multilevel converter and its parameter design method
  • A low-loss modular multilevel converter and its parameter design method

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Embodiment Construction

[0036]The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

[0037] figure 1 It is a schematic diagram of a low-loss modular multilevel converter in an embodiment of the present invention.

[0038] refer to figure 1 As shown, the low-loss modular multilevel converter includes three phase units, and each unit is divided into upper and lower bridge arms. The number is the same; the upper and lower bridge arms are connected in series with current-limiting reactors, and each phase from top to bottom is: all submodules of the upper bridge arm, reactors of the up...

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Abstract

The invention provides a low-loss modular multilevel converter which comprises three phase units. Each phase unit is divided into an upper bridge arm and a lower bridge arm, each bridge arm comprisesa plurality of sub-modules connected in series, and each sub-module is composed of two half-bridge structures, four capacitors and two fly-wheel diodes. The first half-bridge comprises a first switchmodule and a second switch module, and the second half-bridge comprises a third switch module and a fourth switch module. The negative electrode of the first switch module is connected with the positive electrode of the second switch module, the negative electrode of the second switch module is connected with the positive electrode of the third switch module, and the negative electrode of the third switch module is connected with the positive electrode of the fourth switch module. The invention further provides a converter parameter design method. According to the present invention, the faultblocking of the direct-current side short circuit can be achieved by controlling the on-off of the switch modules, and meanwhile losses are not increased.

Description

technical field [0001] The invention relates to the technical field of electric power transmission and distribution, in particular to a low-loss modular multilevel converter with fault blocking capability and a parameter design method thereof. Background technique [0002] With the increase of renewable energy power generation, the integration of renewable energy into the grid has become a very important research direction at present. [0003] The flexible direct current transmission technology provides a solution to solve the grid connection of renewable energy, and has strong technical advantages. Compared with the traditional two-level and three-level converters, the flexible DC transmission technology using modular multi-level converters has better maintainability and scalability, and there is no series voltage equalization and parallel connection of switching tubes. Current sharing problem. Each sub-module of the modular multilevel converter has a relatively simple st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02H7/122G06Q50/06
CPCG06Q50/06H02H7/122H02H7/1222H02M7/483
Inventor 李睿彭程蔡旭
Owner SHANGHAI JIAO TONG UNIV
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