Modeling Dual Active Bridge Converters in DC Distribution Systems


Dual active bridge (DAB) converter systems are proposed for improved modelling. Systematic methods for building models of multiconverter systems are first discussed in this article. System-level analysis and efficient time-domain simulation can be achieved by using the method's continuous-time large signal average models. DAB models are derived from GAM, but the system-level development does not require the identification of a base period. It is also recommended that the high-frequency DAB transformer currents can be reconstructed. DAB models derived using GAM have a significant problem with transformer current modelling, which this method significantly improves. It also doesn't affect the computational complexity of time-domain simulation because the method is applied offline. Both the system-level model construction procedure and the harmonic reconstruction method have been tested in switching simulations and in hardware experiments, respectively.

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