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Capacitance monitoring method of modular multilevel converter based on full-bridge sub-module

A modular multi-level, full-bridge sub-module technology, applied to output power conversion devices, AC power input conversion to DC power output, electrical components, etc., can solve the cumbersome calculation of monitoring methods, consume large processor memory, etc. problems, to achieve the effect of ensuring power supply quality, small computing resources, and simple algorithms

Active Publication Date: 2020-04-10
SOUTHEAST UNIV
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Problems solved by technology

[0005] In recent years, some literatures have proposed monitoring methods for the capacitance of modular multilevel converters, all of which are based on the half-bridge sub-module structure, and the monitoring methods are computationally cumbersome and consume a large amount of processor memory

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  • Capacitance monitoring method of modular multilevel converter based on full-bridge sub-module
  • Capacitance monitoring method of modular multilevel converter based on full-bridge sub-module
  • Capacitance monitoring method of modular multilevel converter based on full-bridge sub-module

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Embodiment Construction

[0027] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0028] Aiming at the problem of capacitor aging in modular multilevel converters, the present invention proposes a capacitor monitoring method suitable for full-bridge MMC, wherein the three-phase MMC topology consists of six bridge arms, such as figure 1 As shown, each bridge arm contains N identical submodules (Submodule, SM) and a bridge arm inductance L s , the sub-module adopts a full-bridge structure, such as figure 2 As shown, each sub-module consists of four power switches T 1 , T 2 , T 3 , T 4 , and a capacitor. Each power switch is anti-parallel connected with a freewheeling diode. The capacitor voltage balance method is as follows: according to the compa...

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Abstract

The invention discloses a capacitance monitoring method of a modular multilevel converter based on a full-bridge sub-module. The method comprises the steps of: selecting two redundant sub-modules froma certain bridge arm of the modular multilevel converter as reference sub-modules; and collecting a bridge arm current and capacitor voltage data of each sub-module on the bridge arm, monitoring capacitor voltage increments of the reference sub-modules and each sub-module in a power frequency period, and obtaining the capacitance of each sub-module capacitor on the bridge arm by utilizing the capacitance of the reference sub-modules, the capacitor voltage increments and the capacitor voltage increments of the sub-modules. According to the method provided by the invention, the capacitance value of each sub-module capacitor is determined through the ratio of the capacitor voltage increments, so that the capacitance in each sub-module of the modular multilevel converter can be effectively monitored.

Description

technical field [0001] The invention relates to a capacitance monitoring method of a modular multilevel converter based on a full bridge sub-module, and belongs to the technical field of multilevel power electronic converters. Background technique [0002] Compared with the traditional two-level and three-level converters, the Modular Multilevel Converter (MMC) has the characteristics of high efficiency, small output AC voltage harmonics, high sine degree, and high modularity. It is suitable for high-voltage and high-power applications, and has broad prospects in flexible direct current transmission, motor drive and other fields. [0003] At present, most of the MMCs put into operation are based on the half-bridge structure, and its outstanding advantages are: less power semiconductor switches are required, the cost and reliability are high, and the switching loss is also small. However, in recent years, there have been more and more researches on the full-bridge structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53871H02M7/4835
Inventor 王宝安邓富金殷诚伟
Owner SOUTHEAST UNIV
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