Generalized multi-scale control scheme for cascade processes with time-delays

Abstract The cascade control is a well-known technique in process industry to improve regulatory control performance. The use of the conventional PI/PID controllers has often been found to be ineffective for cascade processes with long time-delays. Recent literature report has shown that the multi-scale control (MSC) scheme is capable of providing improved performance over the conventional PID controllers for processes characterized by long time-delays as well as slow RHP zeros. This paper presents an extension of this basic MSC scheme to cascade processes with long time-delays. This new cascade MSC scheme is applicable to self-regulating, integrating and unstable processes. Extensive numerical studies demonstrate the effectiveness of the cascade MSC scheme compared with some well-established cascade control strategies.

[1]  Julio E. Normey-Rico,et al.  Smith Predictor-Based Control Schemes for Dead-Time Unstable Cascade Processes , 2010 .

[2]  Tao Liu,et al.  Decoupling two-degree-of-freedom control strategy for cascade control systems , 2005 .

[3]  Jobrun Nandong,et al.  Novel Multiscale Control Scheme for Nonminimum-Phase Processes , 2013 .

[4]  John R. Richards,et al.  Measurement and control of polymerization reactors , 2006, Comput. Chem. Eng..

[5]  Franjo Jović,et al.  Process Control Systems , 1986 .

[6]  R. G. Franks,et al.  Quantitative Analysis of Cascade Control , 1956 .

[7]  Jobrun Nandong,et al.  High-performance multi-scale control scheme for stable, integrating and unstable time-delay processes , 2013 .

[8]  M. Chidambaram,et al.  Enhanced Control of Unstable Cascade Processes with Time Delays Using a Modified Smith Predictor , 2009 .

[9]  O Smith,et al.  CLOSER CONTROL OF LOOPS WITH DEAD TIME , 1957 .

[10]  C. C. Hang,et al.  A new Smith predictor for controlling a process with an integrator and long dead-time , 1994, IEEE Trans. Autom. Control..

[11]  ChangKyoo Yoo,et al.  Enhanced control of integrating cascade processes with time delays using modified Smith predictor , 2010 .

[12]  Somanath Majhi,et al.  Modified Smith predictor based cascade control of unstable time delay processes. , 2012, ISA transactions.

[13]  Tao Liu,et al.  IMC-Based Control Strategy for Open-Loop Unstable Cascade Processes , 2005 .

[14]  Sunwon Park,et al.  PID controller tuning to obtain desired closed loop responses for cascade control systems , 1998 .

[15]  Derek P. Atherton,et al.  Use of Smith Predictor in the Outer Loop for Cascaded Control of Unstable and Integrating Processes , 2008 .

[16]  A. Paor.  A modified Smith predictor and controller for unstable processes with time delay , 1985 .

[17]  Somanath Majhi,et al.  Enhanced cascade control for a class of integrating processes with time delay. , 2013, ISA transactions.

[18]  Ming-Wei Lee,et al.  Simultaneous automatic tuning of cascade control systems from closed-loop step response data , 2012 .

[19]  Tan,et al.  Simultaneous online automatic tuning of cascade control for open loop stable processes , 2000, ISA transactions.

[20]  Thomas F. Edgar,et al.  Process Dynamics and Control , 1989 .

[21]  Babatunde A. Ogunnaike,et al.  Process Dynamics, Modeling, and Control , 1994 .

[22]  Hsiao-Ping Huang,et al.  A SIMPLE METHOD FOR TUNING CASCADE CONTROL SYSTEMS , 1998 .

[23]  M. Chidambaram,et al.  Set point weighted modified Smith predictor with PID filter controllers for non-minimum-phase (NMP) integrating processes , 2010 .

[24]  C. Desoer,et al.  Feedback Systems: Input-Output Properties , 1975 .