电力推进船舶混合动力系统能量管理策略研究

Research on Energy Management Strategy of Electric Propulsion Ship Hybrid Power System

为了保证混合动力船舶的动力性及功率平衡,有效发挥燃料电池与锂电池的优势,需要对其进行合理的功率分配。针对燃料电池和锂电池组成的混合动力系统,提出了一种改进有限状态机与基于母线电压信号下垂控制联合的能量管理策略。引入燃料电池最大、最小、最高效率输出功率,根据船舶负载需求与锂电池SOC,通过改进有限状态机控制策略,实时确定燃料电池输出功率;锂电池通过基于母线电压信号下垂控制策略平抑燃料电池输出功率,稳定母线电压。仿真结果表明:该策略能够使船舶直流电网母线电压在合理的范围内波动、燃料电池输出功率处于高效区且波动平缓、锂电池SOC处于合理区间。

In order to ensure the power and power balance of the hybrid ship,and effectively take advantage of the fuel cell and the lithium battery,it is necessary to make a reasonable power distribution.We proposed an improved energy management strategy for the combination of finite state machine and bus voltage signal droop control for hybrid systems which is composed of fuel cells and lithium batteries.We introduced the maximum,minimum,and maximum efficiency output power of the fuel cell.According to the ship load demand and the lithium battery SOC,the fuel cell output power is determined in real time by improving the finite state machine control strategy;the lithium battery stabilizes the fuel cell output through the droop control strategy based on the bus voltage signal,power,and stable bus voltage.The simulation results show that the strategy can make the bus voltage of the ship’s DC grid fluctuate within a reasonable range,the fuel cell output power is in the high efficiency zone and the fluctuation is gentle,and the lithium battery SOC is in a reasonable range.