Input current waveform optimization topological structure of active third harmonic injection matrix converter

Abstract

The invention discloses an input current waveform optimization topological structure of an active third harmonic injection matrix converter. The input current waveform optimization topological structure comprises a three-phase alternating current power supply, an input filler, a voltage selector IVS, a bus filter, a third harmonic injection circuit, a current type inverter CSI, a three-phase alternating current load, and an output filter inductor; the voltage selector comprises a rectifying stage and three bidirectional switches; the rectifying stage comprises three bridge arms formed by an all-control type device; the third harmonic injection circuit comprises a y bridge arm formed by the all-control type device, and a harmonic injection current filter inductor Ly; and the topological structure has the bus filter on a bus. By virtue of the topological structure, input current sector switching distortion caused by switching of a high frequency bus current and a low frequency harmonic injection current of the active third harmonic injection matrix converter can be suppressed effectively, so that the input current waveform can be improved.

Description

technical field [0001] The invention relates to an electric energy conversion device, in particular to a topological structure capable of improving the input current waveform of an active third harmonic injection matrix converter. Background technique [0002] Matrix converter (MC) is an AC-AC power converter that does not require large-capacity energy storage components. It has the advantages of small size, light weight, high reliability, bidirectional flow of energy, and sinusoidal input and output. It is widely used in the world been widely studied. Two-stage matrix converter is a subclass of matrix converter, which has the advantages of simple clamping circuit and easy implementation of commutation control strategy, but has the limitations of small input power factor angle control range and weak reactive power control capability. In this context, a new type of matrix converter based on active third harmonic injection technology, the active third harmonic injection matri...

AI Technical Summary

Problems solved by technology

When the two are switched, because the instantaneous value of the bus chopping current at the commutation point is uncertain, the switching between the busbar chopper current and the low-frequency inductor current will cause a sudden change in current, causing the input filter to oscillate, thereby distorting the input current

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