Three-level active triple harmonic injection matrix converter with T-shaped structure

Abstract

The invention provides a three-level active triple harmonic injection matrix converter with a T-shaped structure. The three-level active triple harmonic injection matrix converter comprises a rectification-stage circuit, a triple harmonic injection circuit, an inversion-stage circuit and an input LC filter, wherein the rectification-stage circuit is used for rectifying an alternating current input from a three-phase AC input voltage provided by a three-phase AC power supply to a six-pulse DC voltage, the triple harmonic injection circuit is used for generating triple harmonic from a direct current and injecting the triple harmonic to the rectification-stage circuit, the inversion-stage circuit is used for converting the direct current to the alternating current, and the input LC filter comprises a filtering inductor and a filtering capacitor and is used for filtering and providing a neutral point of an inversion stage in the inversion-stage circuit. The three-level active triple harmonic injection matrix converter has the advantages of better control performance, lower common-mode level and higher system efficiency, the control range of input reactive power is expanded, synchronous modulation is not needed, higher output power quality is also provided, and an output waveform is improved.

Description

technical field [0001] The present invention relates to the technical field of power conversion, and more specifically, to a matrix converter based on a T-shaped three-level active third harmonic injection. Background technique [0002] With the rapid development of power semiconductor devices and microcontroller technology, power electronics technology has made rapid progress in the past few decades. Power electronics technology mainly studies how to use power electronic devices or systems to realize efficient utilization, control and conversion of electric energy, so as to meet the major needs of energy saving and consumption reduction in the energy field and new energy development. It is a frontier direction and research hotspot in the field of electrotechnical technology. Whether it is energy saving or new energy development, it is inseparable from the core of power electronics technology - power converter. Among all the power converter structures, the AC-AC power conve...

AI Technical Summary

Problems solved by technology

Although matrix converters have many advantages, such as passive front-end converters, due to their high conversion efficiency, low EMI interference, low cost, simple structure and high reliability, they are widely used in the fields of variable frequency speed regulation and renewable energy power generation. However, most matrix converters still have disadvantages such as energy unidirectional flow, poor input current quality, low power density and reliability, etc.

[0004] The existing third harmonic injection matrix converter adopts a dual-level design, which has the problem that the voltage of the main switching device is too high and the harmonics of the output voltage are too large

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