Centralized PID Controllers for Linear Multivariable Systems

This book presents various controller tuning techniques to design multivariable centralized PI/PID controllers for transfer function matrices of stable/unstable systems. It reviews simple tuning methods for decentralized PID controllers for multivariable systems. An overview of methods, such as design of decentralized PI Controllers by no proportional kick method and analytical methods is given with examples. A simulation study is presented here on the design of decentralized PI controllers for Reactive Ion Etcher (RIE) process. The book explains the biggest log modulus tuning (BLT) method, Synthesis method and Modified internal model control (IMC) method, for the design of centralized controllers for stable and unstable systems. The relative gain array (RGA), relative normalized gain array (RNGA) and ERGA based effective transfer function (ETF) methods are also given to design a centralized control system. Controllers with the improved performance can be obtained for the identified three parameters of the critically damped second order plus time delay (CSOPTD) model rather than based on first order plus time delay (FOPTD) model. The book gives several simulation examples for the design of multivariable control systems for the control of crude distillation column for petroleum units based on the method of inequality and the random search method. Method of designing of multivariable controllers by the goal attainment method is given with examples. This text book is suited for B.Tech and M. Tech students in Chemical Engineering specializing in Process control, Control Engineering, Instrumentation Engineering and Electrical Engineering. This book will be useful for researchers in Control Engineering.