直流船舶综合电力系统中混合储能的精确功率分配策略研究

Research on Accurate Power Distribution Strategy for Hybrid Energy Storage in DC Shipboard Integrated Power System

直流船舶综合电力系统是未来船舶的重要发展趋势,可实现全船能源的集中控制和管理。确保船载直流微电网中各分布式电源间的精确功率分配以及母线电压稳定是维持系统安全、经济运行的先决条件。因此,提出一种基于二次规划算法的精确功率分配方法,该方法充分考虑混合储能系统中不同储能介质的额定容量、荷电状态、爬坡速率以及充放电效率的差异,旨在保证系统稳定性的前提下,实现调压成本最小化。具体而言,其通过直流母线电压波动值确定目标功率,采用二次规划算法将目标功率值在混合储能间进行合理分配,从而以最小成本维持母线电压在允许范围内。最后,通过两个实时仿真研究案例验证了所提控制方法的有效性。

The DC shipboard integrated power system is an important development trend for ships in the future,which can realize the centralized control and management of energy for a whole ship.Ensuring the accurate power distribution among distributed power sources in the shipboard DC microgrid and maintaining the stability of DC bus voltage are prerequisites for the safe and economic operation of the system.Therefore,an accurate power distribution method based on a quadratic programming algorithm is proposed,which aims at minimizing the cost of voltage regulation under the premise of ensuring the system stability,considering the rated capacity,state of charge,and ramp rate of different energy storage media in the hybrid energy storage system(HESS),as well as the difference in the charging and discharging efficiencies.Specifically,the target power is determined based on the DC bus voltage fluctuations,which is further distributed in the HESS reasonably using the quadratic programming algorithm,so as to maintain the DC bus voltage within the desired range at a minimum cost.Finally,two real-time simulation cases are used to verify the effectiveness of the proposed control method.