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MMC topological structure and control method

A technology of topology structure and control method, which is applied to the output power conversion device, electrical components, and AC power input to DC power output, etc. Effect

Active Publication Date: 2018-11-23
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The embodiment of the present invention provides an MMC topology structure and control method, which can effectively solve the problems of the effective utilization rate of the prior art equipment and the high operating cost of the equipment

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] see figure 1 , is a structural schematic diagram of an MMC topology provided by an embodiment of the present invention, including: three bridge arms of three phases; wherein, the three bridge arms respectively include N+1 sub-modules, N+1 reactances and N sub-modules capacitance;

[0027] The sub-module is composed of two insulated gate bipolar thyristors connected in anti-parallel. One end of the sub-module is connected in series with one of the reactances...

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Abstract

The invention discloses an MMC topological structure. The MMC topological structure is characterized by comprising three-phase bridge arms, wherein the three bridge arms comprise N+1 sub modules, N+1electric reactors and N sub module capacitors; each sub module is formed by two thyristors in an anti-parallel mode; one end of each sub module is connected with one electric rector in series, and theother end of each sub module is connected to the bridge arm where the sub module is located; the sub module capacitors are connected between two adjacent electric reactors in series. The MMC topological structure disclosed by the invention can effectively solve the problems existing in effective utilization rate and high equipment operation cost of equipment in the prior art. The embodiments of the invention further disclose a sub module input control method of the MMC topological structure and a sub module removal control method of the MMC topological structure, and flexible and reliable structure control and easy expansion can be realized.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to an MMC topology structure and a control method. Background technique [0002] In recent years, as a new type of DC transmission technology, flexible DC transmission has the advantages of no commutation failure, power supply to isolated loads, no need for communication between converter stations, and easy modular design, which has attracted widespread attention worldwide. . [0003] Modular Multilevel Converter (MMC) is the core equipment of flexible DC transmission. Therefore, it is of great significance to study the optimal topology and control strategy of MMC. [0004] In the existing MMC topology, each phase is generally composed of 2N sub-modules. During operation, a total of N sub-modules are kept in the upper and lower bridge arms, and the remaining N sub-modules are in bypass state. By changing the switching status of the upper and lower bridge arm sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 周保荣洪潮杨健张帆张野李俊杰孙鹏伟
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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