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Abstract-This paper deals with dynamic modeling of multiport DC busses, which are increasingly applied in various DCpower distribution systems, such as hybrid powertrains and DC microgrids. Parasitic impedances of long DC cabling together with distributed DC capacitors introduce a potential risk of smallsignal instabilities in the DC bus, if resonance frequencies of the bus appear below (or around) switching frequencies of powerelectronic converters. In order to predict the resonance behavior of the bus, a systematic approach for dynamic modeling of the DC bus in power-electronic systems is presented. The DC-bus model is validated by means of experiments. Furthermore, application of the model in small-signal analysis and time-domain simulations is illustrated.

This paper presents powertrain comparison for fuel cell hybrid non-road mobile machinery. The objective of this study is to investigate the feasibility of different fuel cell hybrid powertrain topologies. This study concentrates on hybrid powertrain topologies which are generated from the fuel cell source output to loading inverters inputs. The compared features of different powertrains are efficiency, weight, size, cost and lifetime costs, as well as, benefits and disadvantages. The study considers fuel cell hybrid topologies with different active and passive connections of a battery pack, an ultracapacitor pack or the both. The comparison of different powertrain topologies requires a validated simulation tool, specific power control algorithms for each topology, knowledge of the target application and several iteration rounds for simulations.

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