Tri-phase modular multi-level converter and fault-tolerate detecting method for IGBT (insulated gate bipolar translator) open circuit fault in sub-modules thereof

A multi-level converter, three-phase module technology, applied in the direction of converting AC power input to DC power output, instruments, measuring electricity, etc., can solve problems such as the inability of the whole machine to work, the low reliability of MMC, and the high maintenance cost. , to achieve the effect of improving efficiency, reducing current stress and reducing conduction loss
CN103248255AActive Publication Date: 2013-08-14HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2013-08-14

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Abstract

A tri-phase modular multi-level converter and a fault-tolerate detecting method for an IGBT (insulated gate bipolar translator) open circuit fault in sub-modules thereof belong to the field of electronics and aim to solve the problem that the whole machine cannot work caused by the open circuit fault of the existing MMC. The invention adopts a method of connecting two hemi-bridge power units in parallel in each sub-module of the converter, and the IGBT with the open circuit can be positioned by measuring the output voltage UA of the sub-modules and simultaneously applying a certain phase shift control on the IGBTs in the two hemi-bridge power units in at most half alternating current period, and the modular multi-level converter can be continuously operated when any IGBT in any sub-module is subjected to open circuit fault, thus solving the problem of low reliability and frequent halt for repairing of the traditional modular multi-level converter. In addition, the conducting loss of the IGBT can be reduced due to the parallel connecting work mode of the power units and the converting efficiency of the electric energy of the converter is improved.
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Description

technical field

[0001] The invention relates to a fault-tolerant method for detecting an IGBT open-circuit fault in a three-phase modular multilevel converter and a sub-module thereof, belonging to the field of power electronics. Background technique

[0002] In recent years, Modular Multilevel Converter (MMC) has attracted much attention in the field of high voltage and high power. Its topology is composed of multiple sub-modules with the same structure. Each sub-module is composed of a half-bridge topology and a capacitor. By increasing the number of sub-modules, it can be flexibly expanded to high voltage and high power, and its power components can work in Low switching frequency, high energy conversion efficiency, small voltage and current peaks, and very low output voltage harmonic content make it very suitable for high-voltage and high-power electric energy conversion occasions such as flexible direct current transmission.

[0003] The power components of modular mul...

Claims

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