Abstract

Large power and torque fluctuations on electric ship propulsion systems, due to propeller rotation and waves, can affect the reliability of a shipboard power network and cause wear and tear. This paper explores a new solution to address load power fluctuations using a Hybrid Energy Storage System (HESS). The configuration of the combined battery and flywheel (B/FW) system is developed in this paper. Model predictive control is used to balance the competing objectives of power tracking and energy saving under various operating constraints. To quantitatively analyze the performance of B/FW and its associated control strategy, a comparative study is performed and a battery/ultra-capacitor (B/UC) HESS configuration is used as a reference in performance evaluation. Power fluctuation mitigation and HESS loss minimization, the two main objectives, are evaluated in different sea conditions. Pareto-fronts illustrate the trade-off between the main objectives for each HESS configuration. Simulation results show the feasibility and effectiveness of B/FW to mitigate load fluctuations for all-electric ships, especially at high sea states.

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