Backflow power control method for isolated AC-DC matrix converter

Abstract

The invention discloses a backflow power control method for an isolated AC-DC matrix converter. The method comprises the following steps of: firstly, elaborating the generation mechanism of the backflow power of the isolated AC-DC matrix converter under the traditional single phase-shift control; analyzing the working principle of the isolated AC-DC matrix converter under double phase-shift control, and deducing to obtain expressions of inductive current at different moments and expressions of transmission power and backflow power of the isolated AC-DC matrix converter under the traditional single phase-shift control and double phase-shift control; and finally, obtaining a relational expression meeting the requirement that the backflow power is zero. The control method provided by the invention not only can ensure that the basic input and output performance of the converter is not damaged, but also can effectively reduce the backflow power and current of the isolated AC-DC matrix converter, lowers the selection requirement on power switch tubes, increases the system power capacity and improves the transmission efficiency of the converter.

Description

technical field [0001] The invention relates to the field of matrix converters, in particular to an isolated AC-DC matrix converter and a method for suppressing backflow power thereof. Background technique [0002] The isolated AC-DC matrix converter is a new type of AC-DC converter developed on the basis of the AC-DC matrix converter. It has high power density, controllable input power factor, bidirectional flow of energy, and no intermediate The advantages of the direct current energy storage link and so on. It has good application value in battery energy storage, wind power generation, electric vehicle V2G, new energy power generation and other fields. The isolated AC-DC matrix converter realizes the two-way transmission of energy through the phase-shift control technology, but the traditional phase-shift control will cause a large amount of backflow power in the converter, and the backflow power is due to the three-phase-single-phase matrix converter The output voltage...

AI Technical Summary

Problems solved by technology

The isolated AC-DC matrix converter realizes the two-way transmission of energy through the phase-shift control technology, but the traditional phase-shift control will cause a large amount of backflow power in the converter, and the backflow power is due to the three-phase-single-phase matrix converter The output voltage and the transmission inductor current are reversed, and the existence of backflow power will reduce the overall efficiency of the converter. Therefore, it is necessary to take certain measures to control the isolated AC-DC matrix converter to improve the energy transmission of the converter. efficiency

At present, the research on the backflow power is mainly concentrated in the bidirectional full-bridge DC-DC converter, and the research on the backflow power in the matrix converter is blank.

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