Restraining integrated electric propulsion system power fluctuation using hybrid energy storage system

As the ship capacity increasing, large power load fluctuation caused a series of conditions including torque ripple and the voltage fluctuation of ship power grid, and frequently power load fluctuation can also reduce the fuel utilization rate. This paper studies the method about hybrid energy storage system to stabilize the power fluctuation of integrated electric propulsion system and the integrated power system dynamic simulation model is established. Combined with the battery and super capacitor, and considered the system power volatility and hybrid energy storage charge and discharge capacity, hybrid energy storage capacity configuration is optimized using Particle Swarm Optimization (PSO) algorithm. Meanwhile, The active parallel hybrid energy storage system (APHESS), which consist of battery, super capacitor, and the two charge and discharge controller system, is used to control energy storage unit having fast and accurate power throughput. The simulation results show that the energy management strategy, which is proposed in this paper, can better play the complementary advantages of the hybrid energy storages, has a better effect to eliminate the fluctuation of power system and the best economic performance.