【摘要】 在大型锅炉汽包水位控制过程中，当蒸汽流量或给水流量突然变化时，会产生严重的虚假水位现象，本文把Ｓｍｉｔｈ预估控制形式应用到给水流量反馈和蒸汽流量前馈中来补偿系统的非最小相位特性，另外把ＰＩ调节器拆分成Ｐ调节器和Ｉ调节器，并使反馈和前馈不进入Ｉ调节器，来消除稳态误差，整个控制系统结构简单，仿真结果表明，它具有良好的控制效果和很强的鲁棒性。更多还原

【Abstract】 In the course of regulating drum water level in a large sized boiler there will emerge a serious false water level when a sudden change in steam or feedwater flow rate takes place.The authors have applied the prediction control form of Smith to the feedwater flow rate feedback and steam flow rate feed forward in order to compensate system non minimal phase characteristics.Furthermore,a PI regulator is divided into a P regulator and a I regulator,at the same time not allowing the feedback and feed forward to enter the I regulator with a view to eliminating steady state error.The control system as a whole features a simple structure.The results of simulation demonstrate that the system is characterized by a fine control effectiveness and high robustness.更多还原