All electric battery service vessel - Dynamic modeling of a battery fed IPMSM propulsion plant as a tool for energy estimates and functional description for an energy management system

Abstract

"Designing an all-electric battery vessel, knowledge of the dynamic performance of the electrical propulsion plant becomes crucial to produce adequate estimates of needed battery capacity. An energy management system is to control the on-board power flow and ensure energy efficient operation of the vessel. This thesis presents a solution for dynamic simulation of an all-electric battery vessel based on an internal permanent magnet synchronous machine propulsion plant. Insight in system dynamics forms the basis of a proposed functional description for further design of an energy management system. Through description of the different modes and transitions between them, critical aspects and functionality of the control system are enlightened. The thesis presents a tuning guide showing how to tune the model to convergence using measured data from the vessel sea trial. When tuned, the presented model can be used for dimensioning future battery vessels. The model is designed in MATLAB Simulink. Key words: Energy management system, dynamic modeling, battery vessel, IPMSM, electric propulsion."