燃料电池氢气压力自适应控制

Adaptive Control of Hydrogen Pressure of Fuel Cell

燃料电池系统是氢气、氧气通过电化学反应发电的装置,具有无污染,效率高,作为车用动力源被认为是最优的解决方案之一。其中氢气供应系统是需要一定的计量比,且还需要保证氢气的利用率,目前的方案是用引射器来将氢气出口氢气回流进入口。为满足重型车辆的应用,电堆的功率需要越来越大,这就要求电堆的所有工况点都要满足,实际设计过程中,单个引射器很难满足所有工况点。本文设计一种燃料电池氢气双回流系统,满足大功率系统运行,重点研究了氢气双回路耦合控制的控制方法。通过前馈控制与自适应PID控制方法,形成了具有主动适应氢气压力控制方法。最后,将该控制系统和控制方法进行试验验证,在双路切换过程中,耦合控制精度满足±5 kPa。

The fuel cell system is a device that generates electricity from hydrogen and oxygen through an electrochemical reaction.It has no pollution and high efficiency.As a vehicle power source,it is considered to be one of the best solutions.Among them,the hydrogen supply system requires a certain metering ratio and also needs to ensure the utilization rate of hydrogen.The current solution is to use an ejector to return the hydrogen from the hydrogen outlet to the inlet.In order to meet the application of heavy vehicles,the power of the stack needs to be larger and larger,which requires all operating conditions of the stack to be met.In the actual design process,it is difficult for a single ejector to meet all operating conditions.This paper designs a fuel cell hydrogen double﹣recirculation system to meet high﹣power system operation.The focus is on the control method of hydrogen dual﹣loop coupling control.This paper adopts feedforward control and adaptive PID control methods to form a control method with active adaptation to hydrogen pressure..Finally,the control system and control method are verified by experiments.During the two﹣way switching process,the coupling control accuracy meets±5 kPa.