Simplified five-level voltage source type conversion device

Abstract

A simplified five-level voltage source type conversion device is used in a power conversion system, and belongs to the field of power electronic converters. The device comprises four capacitors, the first capacitor C1 and the second capacitor C2 are bus capacitors, and the third capacitor C3 and the fourth capacitor C4 are clamping capacitors. the device further comprises a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal, a fifth wiring terminal, a sixth wiring terminal, a seventh wiring terminal, an eighth wiring terminal, a ninth wiring terminal, and ten insulated gate bipolar transistors (IGBT1 to IGBT10). According to the invention, the number of switching tubes with switching state changes in the level conversion process is reduced, and the control is simple; a clamping diode is not needed, and the number of used capacitors and switching tubes is very small.

Description

technical field [0001] This article relates to a simplified five-level voltage source conversion device, which is used in a power conversion system and belongs to the field of power electronic converters. Background technique [0002] In recent years, with the development of science and technology, power electronics technology has developed rapidly under the impetus of increasing industrial requirements. Multilevel conversion devices have the advantages of low device voltage stress, high power, low switching frequency, low output waveform total harmonic distortion, and low system electromagnetic interference. Therefore, power electronic devices are also widely used in various industries. The topological structures of multilevel converters are divided into diode clamping type, flying capacitor type and cascaded type. These three topologies are widely used. But these three topology types have disadvantages that cannot be ignored. The number of clamping diodes used in diode ...

AI Technical Summary

Problems solved by technology

However, these three topology types have disadvantages that cannot be ignored.

The number of clamping diodes used in diode clamping will increase exponentially with the number of levels, so it is difficult to use it on a large scale in the high-level field

However, most five-level structures cannot effectively solve the problem of the number and cost of topological devices.

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