بسم الله الرحمن الرحيم advanced process control lecture one
DESCRIPTION
بسم الله الرحمن الرحيم Advanced Process Control Lecture one. 1- Syllabus, Marking Scheme and Reference Books 2- Introduction to Single Input – Single Output Control (SISO) - Feedback Control - Feedforward and Cascade Control . Syllabus. Review of SISO control - PowerPoint PPT PresentationTRANSCRIPT
بسم الله الرحمن الرحيم
Advanced Process ControlLecture one
1- Syllabus, Marking Scheme and Reference Books2- Introduction to Single Input – Single Output Control (SISO)
- Feedback Control- Feedforward and Cascade Control
1Lecturer: M. A. Fanaei Ferdowsi University of Mashhad
Syllabus
Review of SISO control Introduction to feedback control theory
Process modeling
Control valve characteristics
Types and modifications of PID controllers
Tuning of PID controllers (offline and online)
Discrete version of PID controllers
Dynamic simulation and control of chemical processes using
MATLAB/SIMULINK2
Syllabus
Advanced SISO control topics Performance and robustness
Cascade control
Feedforward control
Ratio, Override and Selective Control
Predictive control (IMC and Smith predictor)
State-space model (Continuous and Discrete)
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Syllabus
MIMO control topics Centralized and decentralized control
Interaction and relative gain array
Design of static and dynamic decoupler
Predictive control (DMC)
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Marking Scheme & Reference Books
Marking scheme Mid-term exam: 35% Final exam: 40% Homework: 25%
Reference books C. A. Smith and A. Corripio, Principles and Practice of Automatic Process
Control, 3rd edition, Wiley, 2006.
K. J. Astrom and T. Hagglund, Advanced PID Control, ISA, 2006. T. E. Marlin, Process Control: designing processes and control systems for
dynamic performance, 2nd edition, McGraw-Hill, 2000. K. Ogata, Modern Control Engineering, 3rd edition, McGraw-Hill, 1997. K. J. Astrom and B. Wittenmark, Computer Controlled Systems, 3rd edition,
Prentice Hall, 1997. C. C. Yu, Autotuning of PID controllers: A relay feedback approach, 2nd edition,
Springer, 2006. 5
Structures
Objectives
01_1Control objectives and structures
SafetyEnvironmental protectionEquipment protectionSmooth plant operation and productionProduct qualityProfit optimization
FeedbackFeedforwardFeedback/FeedforwardCascade
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Feedback control
Sensor Transmitter
Controller
Final Control Element
Process
Final element
SensorController
Other outputsDisturbances
Controlled variable
Manipulated variable
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01_1Advantages and disadvantages of feedback control
Advantages
• Very simple technique
• Effective for all disturbances
• Provides zero ss offset
• Works with minimum knowledge of the process
Disadvantages
• Does not take control action until the process output has deviated from set point
• Affects the closed-loop stability
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01_4Feedforward control
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01_1Advantages and disadvantages of feedforward control
Advantages
• Compensates for a disturbance before the process output is affected
• Does not affect the stability of the control system
Disadvantages
• Can not eliminate steady-state offset
• Requires a sensor and model for each disturbance
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01_5Feedback / feedforward control
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Cascade Control
When the simple feedback control structure don’t have an
acceptable performance, a cascade structure may
improve the performance (speed up the closed loop
response).
A cascade structure can be used, when a process has some
series dynamics and the output variables between theses
dynamics can be measured. 12
Cascade Control (a process example)
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Cascade Control (a process example)
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