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工程科学与技术:2014,46(5):148-155
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固体氧化物燃料电池气体供应系统的自适应滑模控制
(四川大学电气信息学院)
Adaptive SlidingModeControlforGasFeedingSystemofSolidOxideFuelCells
(SchoolofElectricalEng.andInfo.,SichuanUniv.)
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投稿时间:2013-09-13    修订日期:2014-06-25
中文摘要: 针对固体氧化物燃料电池(solidoxidefuelcells,SOFCs)中的气体供应系统进行自适应滑模控制研究,实现氢气与氧气的分压恒定且相等来保护电解质不受损伤,从而达到延长电池寿命、保护电堆、稳定输出电压的目的。建立了考虑系统内部参数摄动与外部不确定干扰等因素的SOFCs气体分压动态模型,并针对该模型中干扰上界未知的情况设计了自适应滑模控制器。将遗忘因子和修正算法引入对干扰上界的估计中,解决了传统自适应滑模控制器中参数估计值恒增的问题。通过引入边界层,在控制律中用饱和函数替代符号函数以减小抖振。仿真结果表明,设计的自适应律在干扰上界存在较精确的先验信息时能够达到较好的控制效果,对干扰的抑制作用明显,加入边界层后系统抖振得到削弱。
Abstract:An adaptive sliding mode control strategy for gas feeding system of solid oxide fuel cells (SOFCs) was presented.By stabling the pressure of reaction gas to make the pressures of hydrogen and oxygen equal to prevent the electrolytes from damage,the life span of SOFCs is able to be prolonged.A dynamic model for the gas partial pressures of the SOFCs was built with the consideration of internal parameter perturbation and external uncertain interference of the system.An adaptive law,with forgetting factor and modified algorithm,was designed to estimate the upper bound of disturbance while it was unknown.In order to reduce the chattering of sliding mode controller,the sign function was substituted by saturation function in a defined bound near the sliding mode surface.The simulation results showed that the proposed controller has good performance in inhibiting unknown disturbance and eliminating chattering,ensuring that the pressure difference between hydrogen and oxygen could keep in zero while load current has changed.
文章编号:201301137     中图分类号:    文献标志码:
基金项目:中央高校基本科研业务费资助项目(2012SCU11054)
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佃松宜,吴璋,蒲明.固体氧化物燃料电池气体供应系统的自适应滑模控制[J].工程科学与技术,2014,46(5):148-155.
Dian Songyi,Wu Zhang,Pu Ming.Adaptive SlidingModeControlforGasFeedingSystemofSolidOxideFuelCells[J].Advanced Engineering Sciences,2014,46(5):148-155.