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 ID: 661880
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بسم الله الرØمن الرØيمAdvanced Process ControlLecture one
1- Syllabus, Marking Scheme and Reference Books2- Introduction to Single Input – Single Output Control (SISO) - Feedback Control - Feedforward and Cascade Control
1
Lecturer: M. A.
Fanaei
Ferdowsi
University of MashhadSlide2
SyllabusReview of SISO control
Introduction to feedback control theoryProcess modelingControl valve characteristicsTypes 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/SIMULINK
2Slide3
SyllabusAdvanced SISO control topics
Performance and robustnessCascade controlFeedforward controlRatio, Override and Selective Control
Predictive control (IMC and Smith predictor)
State-space model (Continuous and Discrete)
3Slide4
SyllabusMIMO control topics
Centralized and decentralized controlInteraction and relative gain arrayDesign of static and dynamic decouplerPredictive control (DMC)
4Slide5
Marking Scheme & Reference BooksMarking schemeMid-term exam:
35%Final exam: 40%Homework: 25%Reference books
C. A. Smith and A.
Corripio
,
Principles and Practice of Automatic Process Control, 3
rd
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.
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Structures
Objectives01_1
Control objectives and structures
Safety
Environmental protection
Equipment protection
Smooth plant operation and production
Product quality
Profit optimization
Feedback
Feedforward
Feedback/
Feedforward
Cascade
6Slide7
Feedback control
Sensor
Transmitter
Controller
Final Control Element
Process
Final element
Sensor
Controller
Other outputs
Disturbances
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
8Slide9
01_4Feedforward control
9Slide10
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
control11Slide12
Cascade ControlWhen 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.12Slide13
Cascade Control (a process example)
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Cascade Control (a process example)
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