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

Abstract

The invention discloses a method, a device and a storage medium for suppressing a DC bias of a DAB converter, and relates to the control field of a bidirectional active bridge DC-DC converter. The method for suppressing a DC bias of a DAB converter includes: obtaining a DAB The first external phase angle between the two full bridges in the previous stable state of the transient process; wherein, the two full bridges output the first square wave and the second square wave respectively, and the first square wave and the second square wave The phase difference value between the square waves is the first external shift phase angle; when entering the DAB transient process, change the pulse width of the first square wave and the second square wave respectively; according to the first square wave after changing the pulse width Square wave and second square wave, get the phase shift angle. The main purpose of the technical solution proposed by the present invention is to directly change the direction and / or magnitude of power transmission by changing the pulse width of the two square waves during the transient process after the previous steady state, thereby eliminating the traditional DC bias generated by transient process under single phase shift.

Description

technical field [0001] The present invention relates to the technical field of DAB converters, and in particular, to a method, device and storage medium for suppressing a 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 (DirectCurrent, 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 asymmetric, and in severe cases, the iron core of the transformer will be deeply saturated in one direction, increase the loss, damage the switching tube, and affect the working reliability of the DAB converter. SUMMARY OF THE INVENTION [0003] The present invention provides a method, device and storage medium for suppressing the DC bias of a DAB converter, the main purpose of which is to propose ...

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. 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.

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