质子交换膜燃料电池发电系统建模与分析

对质子交换膜燃料电池(PEMFC)发电系统进行动态建模和分析,模型包括质子交换膜燃料电池,供气系统和直流-直流(DC-DC)变换器等部分。首先建立用于预测燃料电池电化学特性和反应气体压力特性的集中参数动态模型,同时给出了供气系统和DC-DC转换器的动态模型,也给出了比例积分型DC-DC变换控制器的设计方法。然后仿真和分析了PEMFC发电系统对快速变化负载的动态响应。采用Matlab-SIMULINK软件对5kW的PEMFC发电系统进行仿真。仿真结果表明系统模型结构简单,计算量小;PEMFC发电系统能够满足快速负载功率需求,满足不同负载的使用要求。

Modeling and analysis of a PEMFC power generation system

The use of proton exchange membrane fuel cell power generation system is expected to become more widespread in near future due to better power quality, reliability, ecological constraints, low operating temperature and fast start up characteristics. This paper focuses on the dynamical modeling and simulation of a PEM power plant consisting of reactant gas supply system, fuel cell system and power converter. A lumped dynamical PEM fuel cell model is developed to predict its electrochemical property and reactant pressure dynamics. The reactant gas supply system and power converter dynamical model are also given.A PI type converter control method is introduced. The model is then used to predict and study the transient response of a PEM power plant when subjected to rapid load changes.A 5 kW PEM power generation system is simulated with Matlab-SIMULINK software. The model appears to be relatively simple and consequently requires less computation time. The results show the fast response capabilities of the PEM power generation in following abrupt changes in the load meet desires of different loads.