论文部分内容阅读
质子交换膜燃料电池(proton exchange membrane fuel cell,PEMFC)发电系统是21世纪最有前景的发电技术之一。针对空冷型PEMFC发电系统工作温度对输出性能影响问题,该文通过理论分析和实验手段研究发电系统输出性能的最优特性。根据空冷型PEMFC发电系统温度控制对象所具有的非线性、迟滞、时变等特点,提出基于FFRLS在线辨识的PEMFC发电系统实时最优温度广义预测控制。其中,FFRLS在线辨识算法用于对非线性控制对象进行建模和在线校正。在搭建的空冷型PEMFC测控实验平台上,通过实验研究控制器参数对于系统性能的影响。阶跃响应实验结果表明:提出的控制方法能够在不同负载条件下实现对电堆最优温度进行实时跟踪。与常规PID控制比较,系统的超调量减少了约32.3%,发电系统输出功率更平稳,有利于发电系统的长期稳定运行,延长电堆的使用寿命。
Proton exchange membrane fuel cell (PEMFC) power generation system is one of the most promising power generation technologies in the 21st century. In view of the influence of operating temperature on the output performance of air-cooled PEMFC power generation system, this paper studies the optimal characteristics of power system output performance through theoretical analysis and experimental methods. According to the nonlinearity, hysteresis and time-varying characteristics of temperature control objects in PEMFC power generation system, the real-time optimal temperature generalized predictive control of PEMFC power generation system based on FFRLS on-line identification is proposed. The FFRLS online recognition algorithm is used to model and calibrate the nonlinear control objects. On the air-cooled PEMFC measurement and control experimental platform, the influence of the controller parameters on the system performance is studied experimentally. The experimental results of step response show that the proposed control method can realize real-time tracking of optimal temperature of stack under different load conditions. Compared with the conventional PID control, the overshoot of the system is reduced by about 32.3%, and the output power of the power generation system is more stable, which is beneficial to the long-term stable operation of the power generation system and prolonging the service life of the power reactor.