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Modeling and Decoupling Control of Current-Fed Dual Active Bridge Bidirectional DC-DC Converter
Received:November 15, 2018  Revised:December 20, 2018
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Keywords:current-fed dual active bridge bidirectional DC-DC converter  equation of state  small signal modeling  decoupling control.
Fund Project:the Open Fund of Microgrid Engineering Technology Research Center of Hubei Province(2015KDW03)
WANG Guixin 47424715@qq.com
XIAO Botao School of Electrical Engineering and New Energy 2930729177@qq.com
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      for the current-fed bidirectional DC-DC converter, its operating principle and steady-state characteristics are analyzed. By listing the state equations in the half-cycle, the small-signal model of the converter is established and the transfer function of the system is derived. Since the intercoupling between the phase shift angle and the duty cycle, which will reduces the dynamic performance of the system during closed-loop control. In order to solve the above problems, a steady-state decoupling control strategy is proposed. On the one hand, To designe controllers, the best pairing of the control volumes and the controlled volumes should be analyzed, which is based on relative gain array; on the other hand, the system steady-state decoupling matrix is obtained based on the system steady-state process gain matrix. The interactions of the two control loops is approximately solved by connecting the steady-state decoupling matrix. Finally, the effectiveness and feasibility of the proposed control strategy areverified by simulation and experimental.