ABSTRACT
Induction Motors have been used as the workhorse in
the industry for a long time due to its easy build, high robustness, and
generally satisfactory efficiency. However, they are significantly more
difficult to control than DC motors. One of the problems which might cause
unsuccessful attempts for designing a proper controller would be the time
varying nature of parameters and variables which might be changed while working
with the motion systems. One of the best suggested solutions to solve this
problem would be the use of Sliding Mode Control (SMC). This paper presents the
design of a new controller for a vector control induction motor drive that employs
an outer loop speed controller using SMC. Several tests were performed to
evaluate the performance of the new controller method, and two other sliding
mode controller techniques. From the comparative simulation results, one can conclude
that the new controller law provides high performance dynamic characteristics
and is robust with regard to plant parameter variations.
KEYWORDS:
1.
Induction
Motor
2.
Sliding Mode
Control
3.
DC Motors
4.
PI Controller
SOFTWARE: MATLAB/SIMULINK
BLOCK
DIAGRAM:
Fig.
1 Induction motor drive system with sliding mode controller
EXPECTED SIMULATION RESULTS:
Fig.2
(a)Rotor speed tracking performance
(b)Rotor speed tracking error
(c)Control effort
Fig.3
(a)Rotor speed tracking performance
(b)Rotor speed tracking error
(c)Control effort
Fig.4
(a)Rotor speed tracking performance
(b)Rotor speed tracking error
(c)Control effort
CONCLUSION
In
this paper, new technique to reduced chattering for sliding mode control is
submitted to design the rotor speed control of induction motor. To validate the
performances of the new proposed control law, we provided a series of
simulations and a comparative study between the performances of the new proposed
sliding mode controller strategy and those of the Pseudo and Saturation sliding
mode controller techniques. The sliding mode controller algorithms are capable
of high precision rotor speed tracking. From the comparative simulation results,
one can conclude that the three sliding mode controller techniques demonstrate
nearly the same dynamic behavior under nominal condition. Also, from the simulation
results, it can be seen obviously that the control performance of the new sliding
mode controller strategy in the rotor speed tracking, robustness to parameter
variations is superior to that of the other sliding mode controller techniques.
REFERENCES
[1]
S.Wade, M.W.Dunnigan, B.W.Williams,
X.Yu, ‘Position control of a vector controlled induction machine using
slotine’s sliding mode control’, IEE Proceeding Electronics Power Application,
Vol. 145, No.3, pp.231-238, 1998.
[2]
V.I.Utkin, ‘Sliding mode control design
principles and applications to electric drives’, IEEE Transactions on
Industrial Electronics, Vol.40, No.1, pp. 23-36, February 1993.
[3]
P.K.Namdam, P.C.Sen, ‘Accessible states
based sliding mode control of a variable speed drive system’, IEEE Transactions
Industry Application, Vol.30, August 1995, pp.373-381.
[4]
R.Krishnan, ‘Electric motor drives:
modelling, analysis, and control’, Prentice-Hall, New-Jersey, 2001.
[5]
R.J.Wai, K.H.Su, C.Y.Tu, ‘Implementation
of adaptive enhanced fuzzy sliding mode control for indirect field oriented
induction motor drive’, IEEE International Conference on Fuzzy Systems,
pp.1440-1445, 2003.
