Abstract
Power flow control of multi-energy sources within series heterogeneous multi-energy drive system (HMDS) can improve the HMDS performance to a considerable extent, such as high fuel economy, low emission and good driving performance. A ship consisting of series HMDS is chosen as the research subject. The ship power system used in this study comprises one diesel engine generator and a lithium-ion battery system. This study develops an energy management strategy (EMS) based on fuzzy logic control and switching threshold to optimal the power flow between the battery storage system and the diesel engine generator so that enhances fuel efficiency. The designed EMS makes it possible for diesel engine operating at its optimal fuel efficiency points. In addition, a set power demand is applied to verify the control effect of the two control strategies in simulation platform. The simulation results indicate that the proposed control strategy reduces fuel consumption and increases fuel efficiency of diesel engine effectively by distributing the power flow properly in comparison with the traditional rule-based energy management strategy.
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