烘丝过程中的组合积分控制器与双重控制研究

摘要

在烟草行业的烘丝过程中,烟丝的出口水分作为被控对象常常具有大滞后与强非线性的特性,且在工艺流程中通常存在干扰因素;当前,这一过程中大多仍采用传统PID控制器,存在响应稳态误差大、响应时间长等问题,进而影响烟丝的最终品质;针对这一情况,引入组合积分控制器替代传统PID控制器在烘丝过程中的作用;同时引入双重控制,并与组合积分控制器相结合;针对控制对象进行的仿真实验结果表明,这一新型控制策略在烘丝过程出口水分的控制效果上明显优于传统PID控制器,稳态误差较小且响应迅速,证明了组合积分控制器运用在双重控制系统中时具有优异的动态性能与鲁棒性;最后,这一新型双重控制算法已成功应用到烟草行业烘丝过程的水分控制上.%In drying process of tobacco industry,the export moisture always has performance with large time delay and strong nonlinearity.Also,disturbance factors exist in this process.At present,traditional PID controller is mostly applied in this process and it has problems such as large steady-state error and long response time,which influence the final quality of tobacco.In response,combined integrating controller is introduced and replaces the role of traditional PID controller in tobacco drying process.Meanwhile,dual control is introduced and combined integrating controller is applied in this strategy.The simulation result shows that the control performance of this new kind of control strategy is superior to the traditional PID controller.Its performance has less steady-state error and prompt response.It proves that combined integrating controller has excellent dynamic performance and robustness when applied in dual control system.Finally,the new kind of dual control strategy has been successfully applied in the moisture control of the tobacco drying process in the tobacco industry.