限制PEMFC电堆高电压现象的控制策略研究

Control strategy research of limiting PEMFC's electrostacking high voltage phenomena

为了限制大功率燃料电池在启动、停机以及低负载时的高电压,延长系统在低负载时的运行时间,通过实验研究,提出一种有效的、可实际应用的控制策略,并在自主搭建的多功能PEMFC测试平台上进行实验测试。结果表明,该控制策略可使各单电池在启动时快速渡过高电压阶段,并迅速维持在0.85 V左右;在停机时能够迅速均匀地消耗残余气体,避免氢/空界面的形成;在低负载运行时,可明显延长电堆的运行时间,减少不必要的启停次数,该研究对于燃料电池的实际应用具有重要的指导意义。

In order to limit the high voltage of the high-powered fuel cell during start-up,shutdown and low-load,and to prolong the running time of the stack at low load,an effective experimental method was proposed.The experiments were carried out on the self-built multifunctional PEMFC test platform.The results show that the control method can help each battery get through high voltage stage quickly at start-up time,and the single voltage rapidly maintain at about 0.85 V.Also,the residual gas will be expended evenly and rapidly in the downtime,avoiding the formation of the hydrogen/air interface.In addition,the running time of the reactor can be obviously prolonged,and the unnecessary start and stop times can be reduced.The study is of great significance for the practical application of fuel cells.