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International Journal of Scientific and Research Publications, Volume 2, Issue 8, August 2012 ISSN 22503153 1 Comparison of Conventional and Fuzzy P/PI/PD/PID Controller for Higher Order Non Linear Plant with High Dead Time Preeti1, Dr. Narendra Singh Beniwal2 1 Electronics & Communication, BIET Jhansi Electronics & Communication, BIET Jhansi 2 Abstract: Several industrial processes have the “deadtime its performance is analysed. Secondly, for the same system a effect ” produced due to measurement delay or due to the FLC is designed with five membership functions, then its approximation of higher order dynamics of the process by a performance is analysed and compared with the conventional simple transfer function model. This delay causes the one. The parameters which are to b compared, taken here are unstabilty of the whole system. In this paper the designing of peak overshoot(MP), Rise time(TR) & Settling time(TS).. Fuzzy controller is done for the system having higher order and high dead time. Performance table shows the affects of the proposed Fuzzy Logic Controllers as compared to the ZN II. GENERALISED FORM OF CONVENTIONAL tuned Conventional Controllers. CONTROLLER A PID controller is designated by: Keywords: PID controller, ZeiglerNichols tuning, Fuzzy G(s) = P+I+D logic controller, High Dead time, tuning, simulation, = KP + KI/s + KDs  (1) = KP (1+ 1/ TI/s + TDs)  (2) I. INTRODUCTION Conventional PID controllers have been a wide range of use Where KP = proportional gain, KI = integration coefficient, in industry because of its simple structure and acceptable TI = integral action, TD = derivative action. performance. This controller deals with both time response For the best performance of the system, there is need of and frequency response improvements if they are properly adjusting these three parameters which is more difficult & tuned. But as the demands increases to control the different time consuming. KD = derivative coefficient. systems in industries, performance of conventional controllers are tend to degrade. Now systems are getting III. DESIGNING OF CONVENTIONAL PID complicated day by day introducing higher order plants which increases the dead time so resulting the unstabilty in CONTROLLER For the higher order and high delay time system with transfer the systems.There is drastic change in the performance of function controllers with the introduction of Fuzzy systems and so ...
International Journal of Scientific and Research Publications, Volume 2, Issue 8, August 2012 1
ISSN 22503153
www.ijsrp.org
Comparison of Conventional and Fuzzy P/PI/PD/PID
Controller for Higher Order Non Linear Plant with
High Dead Time
Preeti
1
, Dr. Narendra Singh Beniwal
2
1
Electronics & Communication, BIET Jhansi
2
Electronics & Communication, BIET Jhansi
Abstract: Several industrial processes have the “deadtime
effect ” produced due to measurement delay or due to the
approximation of higher order dynamics of the process by a
simple transfer function model. This delay causes the
unstabilty of the whole system. In this paper the designing of
Fuzzy controller is done for the system having higher order
and high dead time. Performance table shows the affects of
the proposed Fuzzy Logic Controllers as compared to the ZN
tuned Conventional Controllers.
Keywords: PID controller, ZeiglerNichols tuning, Fuzzy
logic controller, High Dead time, tuning, simulation,
I. INTRODUCTION
Conventional PID controllers have been a wide range of use
in industry because of its simple structure and acceptable
performance. This controller deals with both time response
and frequency response improvements if they are properly
tuned. But as the demands increases to control the different
systems in industries, performance of conventional
controllers are tend to degrade. Now systems are getting
complicated day by day introducing higher order plants
which increases the dead time so resulting the unstabilty in
the systems.There is drastic change in the performance of
controllers with the introduction of Fuzzy systems and so the
Fuzzy controllers (P, PI, PD, and PID) has been designed and
tuned for third order system with such a high dead time
which is difficult to control by the use of conventional
controllers. FLC has been widely used for nonlinear, high
order & high dead time plants. This paper has two main
considerations. Firstly, a PID controller has been designed for
nonlinear unstable third order with high delay system using
Zeigler Nichols tuning method (De Paor & O’Malley, 1989;
Venkatashankar & Chidambaram, 1994; Ho & Xu, 1998), &
its performance is analysed. Secondly, for the same system a
FLC is designed with five membership functions, then its
performance is analysed and compared with the conventional
one. The parameters which are to b compared, taken here are
peak overshoot(M
P
), Rise time(T
R
) & Settling time(T
S
)..
II. GENERALISED FORM OF CONVENTIONAL
CONTROLLER
A PID controller is designated by:
G(s) = P+I+D
= K
P
+ K
I
/s + K
D
s  (1)
= K
P
(1+ 1/ T
I
/s + T
D
s)  (2)
Where K
P
= proportional gain, K
I
= integration coefficient,
K
D
= derivative coefficient.
T
I
= integral action, T
D
= derivative action.
For the best performance of the system, there is need of
adjusting these three parameters which is more difficult &
time consuming.
III. DESIGNING OF CONVENTIONAL PID
CONTROLLER
For the higher order and high delay time system with transfer
function
PID controller family is being designed. Fig1 shows the
simulink model of the conventional controller and plant with
the unity feedback.
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