PEMFC动力系统的动态特性研究

Study on the dynamic behavior of a PEMFC system

研究了1个4kW质子交换膜燃料电池(PEMFC)动力系统的动态特性,包括极化曲线随温度变化、负载快速变化时的动态极化曲线,负载突变时功率、电压、电流的特性。实验表明,温度对极化曲线影响主要表现在活化过电位上;动态极化曲线一般位于稳态极化曲线上部,加载和减载的动态极化曲线之间存在滞后;时间分辨率为1s时,功率、电流对突变负载的响应不存在波动,而开路电压存在波动。

The dynamic behavior and performance of a 4 kW scale PEMFC system were discussed. The experimental results for polarization curves in cases of steady state at different temperatures, constant load resistance, fast load variation and large load switch on and off were presented. It was shown that temperature mainly affected the activation over potential, the dynamic polarization curves (PCs) were generally above the steady PC, on acquisition time of 1?s scale, no fluctuation was observed on power and current, but on open circuit voltage.