【摘要】 针对大惯性、大滞后热工过程因负荷、煤种和环境条件的改变以及模型简化等带来的不确定性,设计了一种便于运行人员理解和工程实现的预估滑模控制方案.首先基于标称工况下辨识得到的二阶加纯滞后(SOPDT)模型,构建一个无迟延输出预估模型,用于过程输出值的预测,然后通过合理设计滑模函数和不确定上界自适应估计的滑模控制律,使得具有不确定性的闭环系统能在任何外扰的作用下保持渐进稳定.针对循环流化床锅炉床温对象的仿真实验结果表明:采用该预估滑模控制方案的床温控制系统调节速度快、超调量小且具有很强的抗干扰能力.更多还原

【Abstract】 To tackle the uncertainties caused by variations of load,coal and environmental conditions as well as by model simplification,apredictive sliding mode control strategy,which is easily understandable and applicable in practice,was proposed for the thermal processes with large inertia or time delay.Firstly,apredictive model without output delay was established to estimate the process output by using a secondorder plus dead-time(SOPDT)model obtained in nominal case.Secondly,a reasonable sliding function and a sliding mode control law with adaptively estimated uncertain upper bound were designed to asymptotically stabilize the closed-loop system with uncertainties and disturbances.On the basis above,numerical simulations were conducted on bed temperature of a circulating fluidized bed(CFB)boiler.Results show that the control strategy proposed is fast in bed temperature regulation with small overshoot and strong anti-disturbance capability.更多还原