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A mmc topology 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: 2020-01-31
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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  • A mmc topology and control method
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  • A mmc topology and control method

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0026] See figure 1 , Is a schematic structural diagram of an MMC topology structure provided by an embodiment of the present invention, including: three-phase three bridge arms; among them, 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 in anti-parallel connection. One end of the sub-module is connected i...

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Abstract

The invention discloses an MMC topology structure, which is characterized in that it includes three bridge arms of three phases; wherein, the three bridge arms respectively include N+1 sub-modules, N+1 reactances and N sub-module capacitors; The module is composed of two thyristors connected in anti-parallel; one end of the sub-module is connected in series with a reactance, and the other end is connected to the bridge arm where the sub-module is located; the capacitor of the sub-module is respectively connected in series between two adjacent reactances. The MMC topological structure disclosed by the invention can effectively solve the problems of the effective utilization rate of the equipment in the prior art and the high operating cost of the equipment. The embodiment of the invention also discloses a sub-module input control method of the MMC topology and a sub-module removal control method of the MMC topology, which can make the structure control flexible and reliable, and easy to expand.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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