Method and system for reducing capacitance value of full-bridge type 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: 2019-07-05
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the full-bridge MMC, especially when there is a negative voltage in t

Method used

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  • Method and system for reducing capacitance value of full-bridge type MMC sub-module
  • Method and system for reducing capacitance value of full-bridge type MMC sub-module
  • Method and system for reducing capacitance value of full-bridge type 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 a system for reducing the capacitance value of a full-bridge type MMC (modular multilevel converter) sub-module. The objective of the invention is to reduce the capacitance value of the full-bridge type MMC sub-module. The method comprises the steps of: calculating the initial phase and theamplitude of an optimal third harmonic voltage; generating an optimal third harmonic voltage according to the initial phase and the amplitude; generating a full-bridge type MMC three-phase referencevoltage by closed-loop control, and further generating reference voltages of each bridge arm of the full-bridge type MMC according to a direct-current voltage reference value, the three-phase reference voltage and the optimal third harmonic voltage; and generating drive control signals switched in or switched on by the full-bridge sub-module in each bridge arm according to the reference voltage ofeach bridge arm to control switching-in or switching-off of all the sub-modules of the upper and lower bridge arms according to the control signals so as to effectively inhibit the fluctuation of thecapacitance voltage of the full-bridge MMC sub-module and further reduce the sub-module capacitance value of the full-bridge 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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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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