Browsing by Subject "HFAC"

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Cross-platform validation of notional baseline architecture models of naval electric ship power systems
(2011) Ali, H.; Dougal, R; Ouroua, A; Hebner, R; Steurer, M; Andrus, M; Langston, J; Schoder, K; Hovsapian, R.
To support efforts in assessing the relative merit of alternative power system architectures for future naval combatants, the Electric Ship Research and Development Consortium (ESRDC) has developed notional baseline models for each of the primary candidate architectures currently considered, medium-voltage DC (MVDC), conventional 60 Hz medium-voltage (MVAC), and high-frequency medium-voltage (HFAC). Initial efforts have focused on the development of a consistent set of component models, of which the system models can be comprised, and the basic definition of the system models. The broader objectives of the consortium, however, go beyond the definition of the baseline models. The focus is on the process by which the models are implemented in software and validated, the process by which the performance of the disparate system models are objectively and quantitatively assessed and compared, and, ultimately, the process by which the relative merits of the architectures may be assessed. This paper focuses specifically on cross-platform component validation.
MVDC and HFAC Electric Power System Architectures for the Transformable Sea Base Connector (T-Craft)
(American Society of Naval Engineers, 2011-09) Herbst, J.D.; Gattozzi, A.L.
The paper presents high frequency ac (HFAC) and medium voltage dc (MVDC) power system architectures for a notional T-Craft concept design and provides a qualitative comparison of relevant performance parameters. In particular the following items are discussed as worthy of attention in view of the large potential benefits they could produce:  Risk mitigation in operating multiple series and parallel connected power conversion modules for both rectification and inversion at multi-megawatt power levels and high peak operating frequency.  Synchronous drive topology offering the potential benefit of eliminating the need for multi-megawatt power conversion without compromising capabilities or performance: this would significantly reduce risk by eliminating much of the power electronics and the attendant size, weight and cost.  Circuit protection strategies and components, for either HFAC or MVDC, for a flexible architecture suitable for fault management and reconfiguration.  Integration of compact, lightweight gearboxes, either conventional planetary or advanced magnetic gear type, with existing designs for high-speed motors at the power level required by T-Craft. Critical technical issues for each power system architecture are identified and proposed simulation and technology development activities are described.