Abstract
Under the traditional phase shift control, dual active bridge DC-DC converter (DAB) has a transient bias on the inductance current when the phase shift ratio changes suddenly, which leads to increase in the current stress of switch tubes and even unidirectional saturation of the transformer. All those will affect the stable operation of the converter. This paper focuses on quantifying the transient DC bias model on the control of triple phase shift when phase shift ratios change, and then the strategy proposed by the paper can eliminate the DC bias within one switching period and reduce current stress and response time by adjusting the drive signal during the transient transition process. Finally, the proposed strategy is verified by simulation results from Matlab/Simulink software.
Highlights
In recent years, with the development of renewable energy, it is necessary to use bidirectional DC-DC converters to achieve bidirectional energy transmission when the renewable energy power generation system and energy storage system are connected to the power grid[1]-[3]
In DAB converter, the inductance Lr acts as an energy storage and release element, and the power of converter is determined by the internal and external phase shift ratios of the primary and secondary sides
In the process of converter power regulation, the sudden change of phase shift ratios will cause an instantaneous current shock in the circuit, and DC bias will appear at this moment
Summary
With the development of renewable energy, it is necessary to use bidirectional DC-DC converters to achieve bidirectional energy transmission when the renewable energy power generation system and energy storage system are connected to the power grid[1]-[3]. The dual active bridge DC-DC converter (DAB) is a typical topology for bidirectional energy transmission It has the advantage of electrical isolation, easy to achieve ZVS soft switching and high power density[4]-[6]. This paper focuses on analyzing the converter under TPS control, through quantitative calculation to adjust the drive signal of the period after phase shift ratios change, so that the converter can transition to the stable state within one switching period after phase shift ratios change. This strategy can reduce current stress, eliminate DC bias and speed up dynamic response when phase shift ratios change
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