PEMFC发动机输出功率瞬态响应仿真研究

Simulation on the dynamic response of PEMFC stack power output

结合质子交换膜燃料电池(PEMFC)发动机的工作原理,建立电化学模型。在此基础上,利用MATLAB/SIMULINK软件平台建立电池的瞬态响应仿真模型。不考虑空气系统的时间滞后,影响电池动态响应时间的主要因素为扩散浓差极化,它限制了电流的变化率。以MarkV型发动机为实例,通过分析负载突变的情况下PEMFC发动机输出功率的瞬态响应特性,得出结论为燃料电池的电化学反应时间常数相对较小,从30kW到50kW突变负载时为122ms(误差为5%)。

With working principles of PEMFC engines, an electrochemistry model of PEMFC was established. Based on this, a dynamic model of stack output response was established on the platform of MATLAB / SIMULINK. Regardless of hysteresis of air system, the main factor that influences dynamic response of fuel cell is diffusion concentration polarization, which restricts the change rate of stack current, Taking Mark V engine as an example, the dynamic response of PEMFC stack power output was researched under the condition of load changes. As a result, the time constant of PEMFC electrochemical response is relatively a small quantity. For Mark V, the time constant with 5% error is 122 ms when the load changes from 30 kW to 50 kW.