Ukrit Chaiya and Somyot Kaitwanidvilai Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand Center of Excellence for Innovative Energy Systems, King Mongkut's Institute of Technology

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24 Οκτ 2013 (πριν από 3 χρόνια και 9 μήνες)

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Robust PMDCM Speed Controller using Genetic Algorithms and Mixed
-
Sensitivity Approach


Ukrit Chaiya
*1
and Somyot Kaitwanidvilai
*2


*1

Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520,
Thailand

*2

Center of Excellenc
e for Innovative Energy Systems, King Mongkut's Institute of Technology
Ladkrabang, Bangkok 10520, Thailand


Abstract

Normally, i
t is d
ifficult

to
design a robust H infinity optimal speed
control
ler for

DC motor
because the
structure

of such controller
is
usually

complicate

and the order of controller is
higher than that of the plant.
To overcome this problem, t
his paper presents a
new
technique for
designing

a robust
Permanent Magnet
DC
M
otor

(PMDCM)

speed
controller
based on the
concept of fixed
-
structure

controller and a mixed sensitivity
approach
.

In the proposed
technique, robust H infinity optimal control problem is formulated as an optimization problem
with a constraint of specified structure controller, and
Genetic Algorithm (GA)
is used
to find the
optimal controller.
In addition, the uncertainties of
motor resistance, motor inductance and load

are incorporated in the design. The evolved controller achieves the advantages of simple
structure controller, robust against parameter variations, and good p
erformance.
Experimental
and simulation results in
a PMDCM
speed control system
verify
the
effectiveness of the
proposed controller.


Keywords:

Robust PMDCM Speed Controller, Genetic Algorithms, Mixed
-
Sensitivity Method, H infinity Control.