Simulation of a Space Vector PWM Controller for a Three-Level
Voltage-Fed Inverter Motor Drive
ABSTRACT
Multilevel voltage-fed inverters with space vector pulse
width modulation strategy are gained importance in high power high performance
industrial drive applications. This paper proposes a new simplified space
vector PWM method for a three-level inverter fed induction motor drive. The
three- level inverter has a large number of switching states compared to a two-level
inverter. In the proposed scheme, three-level space vector PWM inverter is
easily implemented as conventional two-level space vector PWM inverter.
Therefore, the proposed method can also be applied to multilevel inverters. In
this work, a three-level inverter using space vector modulation strategy has
been modeled and simulated. Simulation results are presented for various operation
conditions using R-L load and motor load to verify the system model.
KEYWORDS
1.
Space vector
PWM
2.
Three-level
inverters
3.
Multilevel
inverters
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.1
Three level multilevel inverter using cascaded inverters with separated DC
sources
EXPECTED SIMULATION RESULTS
Fig.2
The line output voltage waveform for fo=10Hz and m=0.65
Fig.3
Three-phase line output current waveforms for fo=10Hz and m=0.65
Fig.4
The line output voltage waveform and its spectrum for fo=10Hz and m=0.65.
Fig.5
The line output voltage waveform for fo=50Hz and m=0.7
CONCLUSION
The
space vector PWM algorithm for a three level voltage-fed inverter using
cascaded H-bridges inverter has been modeled and simulated using
Simulink/MATLAB package program. Simulation results have been given for both
R-L and induction motor loads using 1 kHz switching frequency with various output
frequencies. The proposed control algorithm used in the three-level inverter
can be easily applied to multilevel inverters with more than three levels. It
has been shown that high quality waveforms at the output of the multilevel inverter
can be obtained even with 1 kHz of low switching frequency.
REFERENCES
[1] P.M. Bhagwat and V.R. Stefanovic,
“Generalized Structure of A Multilevel Inverter”, IEEE Trans. On I.A., Vol.
IA-19, n.6, 1983, pp. 1057-1069.
[2] S.K. Mondal, J.O.P Pinto, B.K. Bose, “A
Neural- Network-Based Space Vector PWM Controller for a Three-Level Voltage-Fed
Inverter Induction Motor Drive”, IEEE Trans. on I.A., Vol. 38, no. 3, May/June
2002, pp.660-669.
[3] S.K. Mondal, B.K. Bose, V. Oleschuk and
J.O.P Pinto, “Space Vector Pulse Width Modulation of Three-Level Inverter
Extending Operation Into Overmodulation Region”, IEEE Trans. on Power Electronics,
Vol. 18, no. 2, March 2003, pp.604-611.
[4] M. Manjrekar and G. Venkataramanan,
“Advanced Topologies and Modulation Strategies for Multilevel Inverters”, Power
Electronics Specialists Conference, Vol. 2, 23-27 June 1996, pp. 1013-1018.
[5] A. Nabae, I. Takahashi and H. Akagi, “A
New Neutral-Point-Clamped PWM Inverter”, IEEE Trans. on I.A., Vol. 17, No.5,
September/October 1981, pp.518-523.
