Comparative Analysis of a Single-Phase Model Applicable to the Dual Active Bridge Converter

The dual active bridge (DAB) has become an attractive solution in microgrids due to its versatility in power networks that include renewable sources. At the same time its applications have demanded the introduction of complex modulation and control techniques that require specific hardware. Using hardware-in-the-Ioop (HIL) systems for a real-time implementation, helps to predict the behavior of a system for different operating conditions. This equipment has limited resources in their system, so it is necessary to work with more effective models without losing precision in the process. In this paper a State Variable Model (SVM) implemented in block diagram is proposed. This is compared with the generalized averaged model (GAM) and the conventional Switching Model (SM) using the circuit schematic diagram in Matlab/Simulik and PLECS programs. To confirm this, the processing time in Simulink is compared and the computational burden required in PLECS RT Box 1 are evaluated, verify the same time the signal accuracy. For practical purposes the system under tests is a single-phase DAB connected to a dc source at the input and a resistance at the output. Single-Phase Shift (SPS) modulation is used during open-loop and close-loop. Time-domain simulations show that the SVM is an exact model that requires fewer computational burden than SM, and despite using more than the GAM, however, can provide alternating signals that generate from the high frequency transformer (HFT).