45kW质子交换膜燃料电池发动机建模与仿真

建立了较为完整的包括电堆、反应气体供应以及水热管理3个主要模块的45 kW级质子交换膜燃料电池(PEMFC)发动机数学模型.电堆电压模型引入了误差补偿项,提高了电压计算精度,并通过实验数据得到验证.选取冷却液入堆温度、空气过量系数和阴极入口空气压力为系统的操控变量,在给定电流密度下进行了电堆相关性能对操控变量的敏感性分析.仿真结果表明,为了获得较好的系统输出性能,应适当降低冷却液入堆温度,提高阴极入口空气压力；为了保持合理的电堆温度,必须有效控制该系统的水热管理系统.

Modeling and Simulation of a 45KW Proton Exchange Membrane Fuel Cell Engine

A mathematic model for a 45 kW proton exchange membrane fuel cell (PEMFC) engine system was established, including a fuel cell stack and a reacting gases supply subsystem as well as a water/thermal management subsystem. An error correction term was introduced to improve model accuracy in calculating the stack voltage. Subsequently, the model was validated experimentally. The coolant temperature at stack inlet, air excess ratio and air pressure at cathode inlet were employed as the manipulating variables, meanwhile, the corresponding sensitive analysis and systematic response were made under the given current densities. The simulation results show that the coolant temperature at stack inlet was proposed to reduce appropriately, while the air pressure at cathode inlet to be regulated as high as possible to obtain a better performance of the PEMFE engine system; in order to maintain rational stack temperature, the water/thermal management subsystem should be controlled effectively.