2018 conference paper
Control of active component of current in dual active bridge converter
Thirty-third annual ieee applied power electronics conference and exposition (apec 2018), 323β330.
The paper presents a control strategy based on improved first harmonic approximation model of the single-phase dual active bridge (DAB) converter. The model consists of three state-variables: output DC voltage and two orthogonal components of first harmonic of transformer current, equivalent to active and circulating powers. Foremost, a strategy based on the conventional output voltage control is designed to regulate the output voltage. Subsequently, the first harmonic current control strategy, which aims to control the active power component of the current to regulate the output DC voltage, is introduced. Based on this strategy, a method to design the control system is suggested and its implementation in digital domain is described. The two control strategies are validated through time-domain simulations. Finally, the schemes are implemented for a prototype 500V/270V DC/DC converter. The experimental results are reported and compared against the developed control models for verification.