Insights into Optimization Design and Energy Management of Marine Parallel Hybrid Power System

Marine hybrid power systems have demonstrated significant benefits in enhancing energy efficiency and reducing emissions of pollutants. Among these, marine parallel gas-electric hybrid power systems stand out, using natural gas as engine fuel with fewer energy conversion stages, further enhancing the overall system performance. Proper system configuration and energy management strategies are crucial issues requiring attention in practical ship applications. This study focuses on optimizing the design and energy management strategy of parallel gas-electric hybrid power systems designed for a 7500DWT bulk carrier. System-level modeling for a hybrid power system with real-time capabilities was developed. Utilizing actual navigation data, the impacts of the hybrid ratio and battery capacity on system performance were explored through co-simulation, leading to the proposal of an optimized design scheme with a hybrid ratio of 20% and a battery capacity of 1600 kWh. Additionally, a multi-objective particle swarm optimization algorithm was employed to optimize the thresholds in the static logic threshold-based energy management strategy. The findings revealed that by adopting the optimized thresholds in the energy management strategy, operational costs and system emissions could be reduced.