Method and device for suppressing DC bias of DAB converter, and storage medium

Abstract

The invention discloses a method and a device for suppressing DC bias of a DAB converter, and a storage medium, and relates to the field of bidirectional active bridge DC-DC converter control. The method comprises the steps: obtaining a first external phase shift angle between two full bridges of a previous steady state in a DAB transient process, wherein the two full bridges respectively output afirst square wave and a second square wave, and a phase difference value between the first square wave and the second square wave is the first outer phase shift angle; when entering a DAB transient process, respectively changing the pulse widths of the first square wave and the second square wave; and obtaining a phase shift angle according to the first square wave and the second square wave after the pulse width is changed. According to the technical scheme provided by the invention, the main purpose is to directly change the power transmission direction and / or size by changing the pulse widths of the two square waves in the transient process after the previous steady state, thereby eliminating the direct current bias generated in the transient process under the traditional single phaseshift.

Description

technical field [0001] The present invention relates to the technical field of DAB converters, in particular to a method, device and storage medium for suppressing DC bias of a DAB converter. Background technique [0002] The transient response of the existing bidirectional active bridge (Dual Active Bridge, hereinafter referred to as DAB) bidirectional DC (Direct Current, direct current)-DC converter under the traditional single phase shift control is found to cause the DC bias of the inductor current, resulting in The current waveform of the high-frequency transformer is asymmetrical. In severe cases, it will cause the iron core of the transformer to be deeply saturated in one direction, increase the loss, damage the switch tube, and affect the reliability of the DAB converter. Contents of the invention [0003] The present invention provides a method, device and storage medium for suppressing DC bias of a DAB converter. The downward control method, which can quickly el...

AI Technical Summary

Problems solved by technology

[0002] The transient response of the existing bidirectional active bridge (Dual Active Bridge, hereinafter referred to as DAB) bidirectional DC (Direct Current, direct current)-DC converter under the traditional single phase shift control is found to cause the DC bias of the inductor current, resulting in The current waveform of the high-frequency transformer is asymmetrical, which will cause the iron core of the transformer to be deeply saturated in one direction in severe cases, increase the loss, damage the switch tube, and affect the working reliability of the DAB converter

Images