Analytical and measurement-based wideband two-port modeling of DC-DC converters for electromagnetic transient studies.

• The dynamic simulation of converter-populated power systems requires of models that provide an accurate response over a wide frequency range. • The proposed converter modeling approach allows straightforward interconnectivity with other components defined by wideband representations. • Measurement-based model reconstruction sets the basis for data-driven models that consider variation of operational conditions over time. Power-electronic converters are essential elements for the effective interconnection of renewable energy sources to the power grid, as well as to include energy storage units, vehicle charging stations, microgrids, etc. Converter models that provide an accurate representation of their wideband operation and interconnection with other active and passive grid components and systems are necessary for reliable steady state and transient analyses during normal or abnormal grid operating conditions. This paper introduces two Laplace domain-based approaches to model buck and boost DC-DC converters for electromagnetic transient studies. The first approach is an analytical one, where the converter is represented by a two-port admittance model via mode averaging and inclusion of switching effects. The second approach consists of reconstructing the two-port admittance model of the converter from terminal measurements for a series of tests. The performance of both approaches is evaluated against EMTP simulations, with very close results. [ABSTRACT FROM AUTHOR]