An enhanced generalized average modeling method for a dual active bridge (DAB) converter is presented in this paper. Compared to the conventional lossless model, a lossy correction including conduction losses, core losses and capacitor equivalent series resistor is implemented to improve the modeling accuracy. On this basis, this paper further proves that the 3rd-order component of the leakage inductance current should be included to reduce steady state errors in light load conditions, while others might only consider the 1st-order harmonic in the existing DAB models. Also, a universal form of the modeling equation to include up to any kth-order components is derived in this paper. Finally, comparative simulation and experimental results are presented to validate the feasibility of the analysis. Further analysis and experimental validation will be included in the final version of the paper.
|Titel||Proceedings of 35th Annual IEEE Applied Power Electronics Conference & Exposition (APEC 2020)|
|Status||Accepteret/In press - 2020|
Liu, B., Davari, P., & Blaabjerg, F. (Accepteret/In press). An Enhanced Generalized Average Modeling of Dual Active Bridge Converters. I Proceedings of 35th Annual IEEE Applied Power Electronics Conference & Exposition (APEC 2020) IEEE Press.