A Three-level Active Third Harmonic Injection Matrix Converter with T-Type Structure

Abstract

The present invention provides a T-shaped three-level active third harmonic injection matrix converter, comprising: a rectification stage circuit, a third harmonic injection circuit, an inverter stage circuit and an input LC filter; the rectification stage circuit is used to The three-phase AC input voltage provided by the three-phase input power supply rectifies the AC input into a six-pulse DC voltage; the third harmonic injection circuit is used to generate the third harmonic to the direct current and inject it into the rectification stage circuit; the inverter stage circuit is used for The direct current is converted into alternating current; an LC filter is input, including a filter inductor and a filter capacitor, and the input LC filter is used for filtering and providing a neutral point of the inverter stage in the inverter stage circuit. The present invention not only has better control performance, such as expanding the control range of input reactive power, does not require synchronous modulation, but also provides higher output power quality, improves output waveform, has lower common mode level and higher system efficiency advantage.

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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