ABSTRACT:
Matrix converters as induction motor
drivers have received considerable attention in recent years because of its
good alternative to voltage source inverter pulse width modulation (VSI-PWM)
converters. This paper presents the work carried out in developing a
mathematical model for a space vector modulated (SVM) direct controlled matrix
converter. The mathematical expressions relating the input and output of the
three phase matrix converter are implemented by using MATLAB/SIMULINK. The duty
cycles of the switches are modeled using space vector modulation for 0.5 and
0.866 voltage transfer ratios. Simulations of the matrix converter loaded by
passive RL load and active induction motor are performed. A unique feature
of the proposed model is that it requires very less computation time and less
memory compared to the power circuit realized by using actual switches. In
addition, it offers better spectral performances, full control of the input
power factor, fully utilization of input voltages, improve modulation performance
and output voltage close to sinusoidal.
KEYWORDS:
1.
Matrix Converter
2.
Space Vector Modulation
3.
Simulation Model
4.
Induction
Motor
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure 1: Block
diagram of simulation model for direct matrix converter
EXPECTED SIMULATION RESULTS:
Figure
2: Result for sector identification
Figure
3: Input and output voltage with passive load for q=0.5; R=135.95Ω,
L=168.15mH, Vim=100 V, fo = 60Hz, fs
= 2kHz
Figure
4: Input and output voltage with passive load for q=0.866; R=135.95Ω,
L=168.15mH, Vim=100 V, fo = 60Hz, fs
= 2kHz
Figure
5: Input and output voltage with loaded induction motor for q=0.5; 3hp, Rs
=0.277Ω, Rr=0.183Ω, Nr=1766.9rpm, Lm=0.0538H,
Lr=0.05606H, Ls=0.0533H,
fo=60Hz,
fs=2kHz
Figure
6: Input and output voltage with loaded induction motor for q=0.866;
3hp, Rs =0.277Ω, Rr=0.183Ω, Nr=1766.9rpm,
Lm=0.0538H, Lr=0.05606H, Ls=0.0533H,
fo=60Hz, fs=2kHz
Figure
7: Input current with passive load; R=135.95Ω, L=168.15mH, Vim=100
V, fo = 60Hz, fs = 2kHz (a) q=0.5, (b)
q = 0.866
Figure 8: Input current with loaded induction
motor for q=0.866; 3hp, Rs =0.277Ω, Rr=0.183Ω, Nr=1766.9rpm,
Lm=0.0538H, Lr=0.05606H, Ls=0.0533H, fo=60Hz,
fs=2kHz
CONCLUSION:
The main constraint in the theoretical
study of matrix converter control is the computation time it takes for the
simulation. This constraint has been overcome by the mathematical model that resembles
the operation of power conversion stage of matrix converter. This makes the
future research on matrix converter easy and prosperous. The operation of
direct control matrix converter was analysed using mathematical model with
induction motor load for 0.866 voltage transfer ratio.
REFERENCES:
[1]. A. Alesina, M.G.B.V., Analysis
And Design Of Optimum-Amplitude Nine – Switch Direct AC-AC Converters. IEEE
Trans. On Power. Electronic, 1989. 4.
[2]. D. Casadei, G.S., A. Tani, L. Zari,
Matrix Converters Modulation Strategies : A New General Approach Based On
Space-Vector Representation Of The Switch State. IEEE Trans. On Industrial
Electronic, 2002. 49(2).
[3]. P. W. Wheeler, J.R., J. C. Claire,
L. Empringham, A. Weinstein, Matrix Converters : A Technology Review. IEEE
Trans. On Industrial Electronic, 2002. 49(2).
[4]. H. Hara, E.Y., M. Zenke, J.K. Kang,
T. Kume. An Improvement Of Output Voltage Control Performance For Low
Voltage Region Of Matrix Converter. In Proc 2004 Japan Industry
Applications Society Conference, No. 1-48, 2004. (In Japanese). 2004
[5]. Ito J, S.I., Ohgushi H, Sato K, Odaka
A, Eguchi N., A Control Method For Matrix Converter Based On Virtual
Ac/Dc/Ac Conversion Using Carrier Comparison Method. Trans Iee Japan
Ia 2004. 124-D: P. 457–463.
