TRUONG NGUYEN LUAN VU

MULTI-LOOP PID CONTROLLER:
ANALYSIS, DESIGN, AND TUNING FOR
MULTIVARIABLE PROCESSES

VIETNAM NATIONAL UNIVERSITY – HO CHI MINH CITY PRESS

HO CHI MINH CITY UNIVERSITY OF
TECHNOLOGY AND EDUCATION

TRUONG NGUYEN LUAN VU

MULTI-LOOP PID CONTROLLER:
ANALYSIS, DESIGN, AND TUNING FOR
MULTIVARIABLE PROCESSES

Vietnam National University Ho Chi Minh City Press - 2018

PREFACE

In recent years, multi-loop proportional-integral/proportionalintegral-derivative (PI/PID) controllers are one of the most widely used
industrial controllers. The reason for this popularity is due to the
industrial perspective, efficiency, improved productivity, and product
quality goals since multi-loop control systems satisfy all of those
demands for more effective operational strategies and allow more
advanced tools to be implemented. In addition, they are also easily
understood by their sound theoretical foundation, required fewer
parameters to tune than multivariable control systems that help maximize
the economic benefits, and easily obtained the loop failure tolerance that
is very important for practical applications. Therefore, many design
methods of multi-loop PI/PID controllers have been suggested in the
process of control literature over the years. Among them, the wellknown IMC-PID approach is often utilized because of its powerful
framework and effectiveness for the design and implementation. It
attracts the control engineers and academics because the tradeoff between
the robustness and performance are directly related to one design
parameter as the time constant of IMC filter or the closed-loop time
constant, equivalently. This is a very useful characteristic of the IMCPID approach, which guarantees multi-loop control systems to be tuned
satisfying the robust stability condition. Furthermore, the direct
synthesis for the multi-loop PI/PID control system that has the similar
features of the IMC-PID approach is also considered by many authors.
In this textbook, the novel analytical methods based on the
generalized multi-loop IMC-PID approach and direct synthesis are
proposed different states of the robust design of multi-loop proportionalintegral/proportional-integral-derivative (PI/PID) controllers.
The
proposed methods are aimed at achieving the desired closed-loop
3

responses for multivariable processes with multiple time s. It is
known that the interactions between input/output variables are very
common phenomena encounte
...

...
s Control 2003, 13,
253-265.
51 William, S.L. Control System Fundamentals. 1st edn. CRC Press,
1999.
52 Wood, R.K Berry, M.W. Terminal Composition Control of A
Binary Distillation Column. Chem. Eng. Sci. 1973, 28, 1707-1717.
53 Ziegler, J.G. Nichol, N.B. Optimum Settings for Automatic
Controllers. Trans. ASME 1942, 64, 1942, 759-768.

194

MULTI-LOOP PID
CONTROLLER:
ANALYSIS, DESIGN
AND TUNING FOR
MULTIVARIABLE
PROCESSES

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ISBN: 978-604-73-5977-6

MULTI-LOOP PID CONTROLLER:
ANALYSIS, DESIGN AND TUNING
FOR MULTIVARIABLE PROCESSES

TRUONG NGUYEN LUAN VU

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