Method and system for reducing capacitance value of full-bridge mmc sub-module

A technology of full-bridge sub-module and capacitance value, applied in the field of modular multi-level converters, to achieve the effect of suppressing fluctuation and reducing capacitance value

Active Publication Date: 2021-01-01
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

For the full-bridge MMC, especially when there is a negative voltage in the bridge arm voltage, there is little analysis in the existing literature

Method used

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  • Method and system for reducing capacitance value of full-bridge mmc sub-module
  • Method and system for reducing capacitance value of full-bridge mmc sub-module
  • Method and system for reducing capacitance value of full-bridge mmc sub-module

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Embodiment Construction

[0056] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

[0057] figure 1 It is a schematic diagram of the composition of the full-bridge MMC in the embodiment of the present invention. Such as figure 1 As shown, the full-bridge MMC is a three-phase symmetrical structure, and each phase is composed of upper and lower bridge arms, a total of 6 bridge arms. Each bridge arm consists of cascaded n (n ≥ 1 and n is a positive integer) full-bridge sub-modules FBSM 1 -FBSM n It is formed in series with a bridge arm inductance L. Wherein, each full-bridge sub-module is composed of four switching tubes and a capacitor. Such as the full bridge sub-module FBSM 1 , composed of semiconductor switch tubes S1-...

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Abstract

The invention relates to the technical field of modular multilevel converters, in particular to a method and system for reducing the capacitance value of a full-bridge MMC sub-module, with the purpose of reducing the capacitance value of a full-bridge MMC sub-module. The method for reducing the capacitance value of the full-bridge type MMC sub-module proposed by the present invention includes: calculating the initial phase and amplitude of the optimal third harmonic voltage; generating the optimal third harmonic voltage according to the initial phase and amplitude; generating by closed-loop control Full-bridge type MMC three-phase reference voltage, and then generate the reference voltage of each bridge arm of the full-bridge type MMC according to the DC voltage reference value, the three-phase reference voltage and the optimal third harmonic voltage; the reference voltage of each bridge arm is generated to control each bridge The driving control signal of the full-bridge sub-module in the arm is switched on or off, and all the sub-modules of the upper and lower bridge arms are controlled to be switched on or off with this signal, which can effectively suppress the fluctuation of the capacitor voltage of the full-bridge MMC sub-module, and further reduce the overall Capacitance value of the sub-module of the bridge type MMC.

Description

technical field [0001] The invention relates to the technical field of modular multilevel converters, in particular to a method and system for reducing the capacitance value of a full-bridge MMC sub-module. Background technique [0002] The voltage sourced converter high voltage direct current (VSC-HVDC) technology based on the voltage source converter has the advantages of strong power flow regulation ability, flexible operation mode and black start ability, and has won the attention of scholars and research institutions at home and abroad. widespread attention. On the other hand, modular multilevel converter (MMC) has greatly promoted the development of VSC-HVDC technology due to its advantages of low harmonic content, high reliability and high efficiency. In recent years, multi-terminal DC transmission (multi-terminal DC, MTDC) projects and asynchronous grid interconnection projects based on modular multilevel converters have been put into operation in various parts of t...

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 赵聪栾轲栋李子欣王平李耀华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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