45kW质子交换膜燃料电池发动机建模与仿真

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

摘要:

建立了较为完整的包括电堆、反应气体供应以及水热管理三个主要模块的45kW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，冷却液入堆温度应适当降低，而阴极入口空气压力应提高；为了保持合理的电堆温度，必须对该系统的水热管理系统进行有效控制.

Abstract:

In this paper, a mathematic model for a 45kW proton exchange membrane fuel cell (PEMFC) engine system has been proposed. The model includes a fuel cell stack, reacting gases supply subsystem as well as water/thermal management subsystem. As for calculating the stack voltage, an error correction term is introduced in order to improve model accuracy. Subsequently, the model has been validated experimentally. The coolant temperature at stack inlet, air excess ratio and air pressure at cathode inlet have been chosen as the manipulating variables, meanwhile the corresponding sensitive analysis and systematic response have been made under the giving current densities. The simulation results show that, in order to obtain the higher performances of the PEMFC engine system, the coolant temperature at stack inlet should be reduced appropriately, while the air pressure at cathode inlet should be regulated as high as possible, in order to maintain rational stack temperature, the water/thermal management subsystem should be controlled effectively.