【摘要】 主蒸汽压力是电厂热工过程控制中的重要参数,由于锅炉燃烧工况变化较大,主汽压对象模型具有不确定性,常规控制方法很难得到预期的控制效果。为提高系统控制品质,提出了主汽压系统的H∞混合灵敏度设计方法,给出了选择加权函数的具体方法,采用MATLAB软件进行仿真计算,得到H∞最优控制器。仿真结果表明,在对象模型参数发生较大变化时,与常规PID调节方法相比,H∞最优控制器能使主汽压控制系统具有良好的鲁棒稳定性和动态性能。更多还原

【Abstract】 Main steam pressure is an important parameter in the thermal process control of power plant,which can not be regulated easily.Because boiler burning behaviour varies greatly and the model of main steam pressure is of highly uncertainty,conventional control method can not obtain the expected control effect.In order to improve system control quality,this paper puts forward H∞ mixed sensitivity design method for main steam pressure system.The specific means for choosing mixed sensitivity is given.MATLAB is used to get H∞ optimum controller.Compared with the conventional PID control method,the results show that,when the object model varies strongly,H∞ optimum controller can optimize the main steam pressure control system with better robustness stability and dynamic performance.更多还原