Nodal-reduced modeling of three-phase dual-active bridge converters for EMTP-type simulations

Modeling the terminal behavior of power system components in transient condition is of great necessity for systemlevel simulations of future DC grids. One vital component in DC grids are power electronic converters. Therefore, efficient models of power electronic converters, which model their terminal behavior, are needed for transient system-level simulations. In this paper, an approach for eliminating all internal electrical nodes of power electronic converters in EMTP-type simulations is applied on the three-phase Dual-Active Bridge DC-DC converter. The presented modeling approach maintains the switching dynamics as well as the dynamics caused by the internal circuitry at the terminals of the converter. Furthermore, this modeling approach reduces the number of electrical nodes in EMTP-type simulations. This leads to a reduction of the computational burden when simulating extensive DC grids with a large number of power electronic converters. The presented nodal-reduced model enables the efficient system-level simulation of future DC grids using EMTP-type simulators.