燃料电池城市客车混合动力系统的自适应控制

Adaptive Control of the Hybrid Power System in Fuel Cell City Bus

在燃料电池发动机和镍氢电池组组成的混合动力系统中,提出了通过一个双向电源变换器实现双电源输出功率混合的控制方法。在分析燃料电池发动机输出特性的基础上,设计了双向电源变换器的外特性曲线,使得镍氢电池组根据燃料电池发动机输出电压的变化,自动调节工作模式和充、放电电流,实现了混合动力系统输出功率的自适应控制,得到了稳定的动力系统输出电流和电压的变化过程。

For hybrid power system composed of a fuel cell engine and a group of Ni-H batteries, a new control method with a bi-directional power converter is proposed, On the base of analyzing the output characteristic of the fuel cell engine, an external characteristic of the bi-directional power converter is designed, making the Ni-H batteries automatically adjust their charging or discharging currents. As a result, the output power of the hybrid system is controlled adaptively, obtaining stable outputs of l-t and U-t processes of the power system.