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Submodule capacitor voltage fluctuation inhibiting method for full-bridge type modularized multi-level converter

A modular multi-level, capacitor voltage technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as capacitor voltage fluctuations

Active Publication Date: 2019-09-10
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing patents rarely involve how to reduce the capacitor voltage fluctuation of the sub-modules of the full-bridge modular multi-level converter when the grid side fails.

Method used

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  • Submodule capacitor voltage fluctuation inhibiting method for full-bridge type modularized multi-level converter
  • Submodule capacitor voltage fluctuation inhibiting method for full-bridge type modularized multi-level converter
  • Submodule capacitor voltage fluctuation inhibiting method for full-bridge type modularized multi-level converter

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 As shown, the full-bridge modular multilevel converter applied to the present invention is composed of three phases, each phase is composed of upper and lower bridge arms, and each bridge arm contains a bridge arm inductor and N cascaded The full bridge submodule FBSM 1 ,...,FBSM N , N≥1 and N is a positive integer.

[0022] The control block diagram of the sub-module capacitor voltage fluctuation suppression of the full-bridge modular multi-level converter under the single-phase-to-ground short-circuit fault condition of the present invention is as follows: figure 2 shown, including the following steps:

[0023] (1) Calculate the DC reference voltage of the full-bridge modular multilevel converter;

[0024] When a single-phase-to-ground short-circuit fault occurs on the grid side of the full-bridge modular multile...

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Abstract

The invention discloses a submodule capacitor voltage fluctuation inhibiting method for a full-bridge type modularized multi-level converter under the conditions of earthing short circuit failures ofsingle phase, such as A phase, B phase or C phase. According to the submodule capacitor voltage fluctuation inhibiting method, when the earthing short circuit failures of single phase appear on the power grid side of the full-bridge type modularized multi-level converter, the full-bridge type modularized multi-level converter operates in the working condition that the modulation ratio is 1.67 by reducing the voltage on the direct current side of the full-bridge type modularized multi-level converter, so that submodule capacitor voltage fluctuation inhibition for the full-bridge type modularized multi-level converter is realized.

Description

technical field [0001] The invention relates to a method for suppressing fluctuations in capacitor voltage of a sub-module of a full-bridge modular multilevel converter. Background technique [0002] Compared with the traditional high-voltage direct current transmission technology based on grid commutation converters, the flexible high-voltage direct current transmission technology based on voltage source converters does not have the risk of commutation failure, active power and reactive power can be independently decoupled and controlled, and With black start capability, it has high economy and flexibility. Modular multilevel converters, with their advantages of good harmonic characteristics, high efficiency and high reliability, have injected new vitality into the development of flexible HVDC transmission technology. Therefore, based on modular multilevel converters HVDC transmission systems have been widely used. [0003] In the field of overhead line DC transmission, t...

Claims

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0038
Inventor 赵聪胡洋李子欣李耀华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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