Discussion of a Hybrid Diesel-Electric Propulsion System for Unmanned Surface Vessels to Improve Fuel Economy and Mission Effectiveness without Loss of Peak Performance

摘要

This paper considers the initial feasibility of an unmanned surface vessel (USV) using a Series Hybrid Diesel Electric propulsion system. The study considers the integration of a novel, diesel electric hybrid propulsion and control system to be used on board small manned or unmanned marine vessels to improve fuel economy and mission effectiveness without loss of peak performance. The system features variable-speed, direct current (DC) generators, lithium ion batteries, and variable-speed, alternate current (AC) drives connected to high efficiency permanent magnet motors. The overall power management and mission management system proposed provides the operational flexibility to make decisions regarding the best use of the generator's fuel curves or even shut engines off to provide better fuel economy and achieve more time on station. A potential concept of operation is included in the study to highlight areas where this system can be beneficial over current USV design approaches, and to identify areas where further technology advances are necessary in order to realize the full potential of this type of system.