家用燃料电池热电联供系统的建模与仿真

Modeling and simulation of PEMEC-based CHP systems for residential application

家用燃料电池热电联供系统是一种清洁高效的分布式发电方式,近年来发展迅猛。开展家用热电联供系统建模与仿真,对于构建热电联供实际系统具有一定指导意义。在Matlab/Simulink平台上搭建了千瓦级燃料电池热电联供系统(包括电模型和热模型),电模型包含氢氧供应子系统、质子交换膜燃料电池模型以及功率控制模型;热模型包括热管理子系统和辅助热水器等模型。基于此热电联供模型,进行了燃料电池发电系统动态特性分析,然后采用电跟随策略,通过参考模拟工况下的电负荷与热负荷曲线研究了可变负载下系统的动态行为。仿真结果表明,该系统在热负荷与电负荷上都有较短的响应时间和较高的控制精度。

PEMEC-based CHP systems for residential application were clean and high efficiency distributed power generators were developed rapidly in recent years. Modeling and simulation results of a residential FC-CHP system were instructive for constitution of an actual system. A model of kW level PEMFC-CHP system was built in Matlab/Simulink （including electrical model and thermal model）, the electrical model included hydrogen and oxygen supply subsystem, fuel cell voltage and power model and power control model, and the thermal model included heat management subsystem and auxiliary boiler. Based on the developed model, the dynamic stability of the power system was analyzed. Then the behavior of CHP system under variable electrical and thermal load was investigated according to reference electrical and thermal load curves with a electrical load following strategy. The simulation results state that this system can response quickly with high control precision.