Hybrid Electric Drive Evaluation for CG 47 Guided Missile Cruisers

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Abstract
The hybrid electric drive (HED) topology has been studied and reported on for application to the  DDG 51 class guided missile destroyers. The Navy tasked an industry team comprised of Northrop  Grumman and L-3 Power Paragon to complete a sizing and concept study to apply the HED concept  to the CG 47 class guided missile cruisers. This paper reports on the results of this study, including  system architecture and sizing, impact on fuel use and emissions and technical hurdles. Additionally  key component  developments are reported, including an electric machine topology and sizing study  completed by CurtissWright Electro-Mechanical Division

Introduction
Numerous studies have been reported defining and assessing a hybrid electric drive (HED)  modification to the existing DDG 51 propulsion and power generation plant (Doyle and Clayton  2006; McCoy et al. 2007; Castles and Bendre 2009). The principal motivation is reducing fuel  consumption. The Navy tasked an industry team comprised of Northrop Grumman and L-3  Power Paragon to examine the merits of these HED concepts applied to the CG 47 class guided  missile cruisers. As shown in Figure 1, the HED topology considered interconnects the present  mechanical drive propulsion system to the ship’s service electrical power system. Similar to a  DDG 51, the CG 47 class engineering plant is comprised of four LM2500 propulsion  turbines (two per shaft) and three Alison (now Rolls-Royce) gas turbine generator (GTG) sets.