Internal Model Control to an Isolated Dual Active Bridge DC-DC Converter

This work presents an internal model control (IMC) scheme with one degree of freedom applied to regulate the output voltage of isolated dual active bridge DC-DC converter with voltage mode control. Internal model control structure is a model-based control predictive control structure and provides easy tuning to achieve the disturbance rejection and set-point tracking. IMC is designed using the linear model derived using generalized average modelling method around an operating condition. Simulation results are shown for a 100W, 20 kHz converter system to validate the IMC control, with different types of disturbances applied to the power converter to check its performance. Finally, the servo response and regulatory response of IMC are compared with the conventional feedback control approaches, K-factor approach-based controller and Proportional Integral (PI) controller in MATLAB/SIMULINK based simulations. The simulation results obtained reveal the strength and the efficacy of IMC by showing the better dynamic performance.