杜祎君,成咪,任振涛

• 1:太原科技大学电子信息工程学院

摘要(Abstract)：

针对串级不稳定时滞过程提出了一种改进的二自由度Smith预估控制方法。该方法在副回路采用了内模PID控制，快速消除了副回路干扰对系统性能的影响。主回路采用了二自由度Smith预估控制方法，首先使用了PD控制器将不稳定时滞过程转换为稳定时滞过程，然后在设定值跟随控制回路中引入了通过Bode理想传递函数设计的分数阶控制器，增强了系统的鲁棒性，在干扰抑制回路中使用内模控制改善了系统的抗扰性。经仿真实验验证，该方法不仅参数整定简单，且能使系统具有良好的闭环性能与鲁棒性。

关键词(KeyWords)： 串级不稳定时滞过程;内模控制;Smith预估控制;二自由度控制;分数阶控制

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 杜祎君,成咪,任振涛

参考文献(References)：

• [1] ANUSHA A,RAO A S.Design and analysis of IMC based PID controller for unstable systems for enhanced closed loop performance[J].IFAC Proceedings Volumes,2012,45(3):41-46.
• [2] BEGUM K G,RAO A S,RADHAKRISHNAN T K.Enhanced IMC based PID controller design for non-minimum phase(NMP) integrating processes with time delays[J].ISA transactions,2017,68:223-234.
• [3] AJMERI M,ALI A.Analytical design of modified Smith predictor for unstable second-order processes with time delay[J].International Journal of Systems Science,2017,48(8):1671-1681.
• [4] KUMAR M P,NARAYANA K V L.Multi control scheme with modified Smith predictor for unstable first order plus time delay system[J].Ain Shams Engineering Journal,2018,9(4):2859-2869.
• [5] 尹成强，高洁，孙群，等.基于改进Smith预估控制结构的二自由度PID控制[J].自动化学报，2020,46(6):1274-1282.
• [6] 王建鹏，张森，刘宁.二阶不稳定时滞过程的二自由度Smith预估控制[J].太原科技大学学报，2020,41(2):118-123.
• [7] BEGUM K G,RADHAKRISHNAN T K,Rao A S,et al.IMC based PID controller tuning of series cascade unstable systems[J].IFAC-PapersOnLine,2016,49(1):795-800.
• [8] DASARI P R,ALLADI L,RAO A S,et al.Enhanced design of cascade control systems for unstable processes with time delay[J].Journal of process control,2016,45:43-54.
• [9] PASHAEI S,BAGHERI P.Parallel cascade control of dead time processes via fractional order controllers based on Smith predictor[J].ISA transactions,2020,98:186-197.
• [10] KEZIZ B,DJOUAMBI A,LADACI S.A new fractional order controller tuning method based on Bode’s ideal transfer function[J].International Journal of Dynamics and Control,2020,8(3):932-942.
• [11] SAFAEI M,TAVAKOLI S.Smith predictor based fractional-order control design for time-delay integer-order systems[J].International Journal of Dynamics and Control,2018,6(1):179-187.
• [12] QIBING J,QIE L,QI W,et al.PID controller design based on the time domain information of robust IMC controller using maximum sensitivity[J].Chinese Journal of Chemical Engineering,2013,21(5):529-536.
• [13] ZHAO Z,LIU Z,ZHANG J.IMC-PID tuning method based on sensitivity specification for process with time-delay[J].Journal of Central South University of Technology,2011,18(4):1153-1160.