适用于质子交换膜燃料电池系统的高阶滑模观测器

High-order sliding mode observer for proton exchange membrane fuel cell system

针对质子交换膜燃料电池(PEMFC)系统内部状态变量难以通过传感器直接测量,导致不能对PEMFC系统进行故障诊断和设计基于模型的控制器的问题,设计了高阶滑模(HOSM)观测器。首先,搭建了适用于观测的11阶阳极死端PEMFC系统模型。然后,在该模型的基础上,通过HOSM算法对传感器测量值(电堆电压、空压机出口流量以及电堆温度)与估计值之间的误差进行调节,设计了HOSM观测器。最后,将本文HOSM观测器性能与传统滑模观测器性能进行了仿真实验对比。通过对比观测效果图以及平方误差积分可知:本文观测器能够准确地观测各状态量,并且观测性能更优。

To address the problem that the internal state variables of the Proton Exchange Membrane Fuel Cell(PEMFC)system are difficult to be measured directly by sensors,which makes it impossible to troubleshoot the PEMFC system and design a model-based controller,the High Order Sliding Mode(HOSM)observer was designed.Firstly,an 11th-order anode dead-end PEMFC system model suitable for observation was built.Then,on the basis of this model,the HOSM observer was designed by adjusting the errors between the measured sensor values(stack voltage,compressor outlet flow rate and stack temperature)and the estimated values by the HOSM algorithm.Finally,the performance of the designed HOSM observer was compared with the performance of the traditional sliding mode observer.The comparison results of the observation effect and the squared error integral show that the designed observer can accurately observe each state quantity and has better observation performance.