摘要
车载燃料电池阴极空气流量控制是保证系统高效工作的重要条件之一,过氧比参数用于衡量空气流量的供给状况,文章分析了在不同电堆电流下系统的过氧比特性,研究了电堆工作温度以及膜含水量对最佳过氧比的影响,研究结果表明,最佳过氧比不受膜含水量的影响,而电堆工作温度对最佳过氧比有微弱的影响。为保证系统工作在最佳过氧比,采用最优过氧比调节器+模糊控制的策略,根据电堆电流及相应的最佳过氧比,利用前馈控制得到压缩机空气流量参考值,然后利用模糊控制器改变电动机电压控制压缩机空气流量。仿真结果表明,该控制方法具有良好的动、静特性。
The cathode air flow control of vehicle fuel cell is one of the most essential condition of the guarantee of the system efficient, and the oxygen excess ratio is used for measuring supply condition of air flow. Based on all foundations of vehicle fuel cell model, this paper analyses system oxygen excess ratio characteristic on conditions of different stack current and researches on the influences about stack working temperature and membrane water content on optimal oxygen excess ratio. The results of researches showed that stack working temperature had little impact on optimal oxygen excess ratio, instead, membrane water content had no effect on optimal oxygen excess ratio. In order to make sure the system is working under optimal oxygen excess ratio, the strategy of optimal oxygen excess ratio regulator ＋ fuzzy control is put forward. According to the stack current and the corresponding optimal oxygen excess ratio, the compressor air flow reference value is obtained by feedforward control, and then the compressor air flow is well controlled by motor voltage by using fuzzy controller. The results of simulation is confirmed that the control strategy has good dynamic and static characteristics.
出处
《可再生能源》
CAS
北大核心
2017年第2期304-310,共7页
Renewable Energy Resources
基金
国家科技支撑计划(2014BAG08B01)
关键词
车载燃料电池
过氧比
最优调节器
空气流量
vehicle fuel cell
Oxygen excess ratio
optimal controller
air flow
