International Journal of Application or Innovation in Engineering & Management (IJAIEM)
Web Site: www.ijaiem.org Email: editor@ijaiem.org, editorijaiem@gmail.com
Volume 2, Issue 12, December 2013
ISSN 2319 - 4847
Analysis of Space Vector Pulse Width
Modulation VSI Induction Motor on various
conditions
Padma Chaturvedi1, Amarish Dubey2
1
Department of Electrical Engineering, Maharana Pratap Engineering College, Mandhana, Kanpur (U.P.) India
2
Department of Electronics and Communication Engineering, Rama Institute of Engineering and Technology,
Mandhana, Kanpur (U.P.) India
ABSTRACT
In this paper an attempt is made to investigate the performance of SVPWM VSI-fed induction motor drive. The openloop Simulink model of the voltage source inverter-fed induction motor drive is presented based on space vector theory.
Simulation results are obtained for performance analysis of the drive under different loading conditions and are discussed in
detail.
Keywords: Induction motor drive, Space vector pulse width modulation (SVPWM), Voltage source inverter.
1. INTRODUCTION
Advances in power electronics have led to an increased interest in voltage source inverters with pulse width modulation
control of AC drives. A number of pulse width modulation (PWM) schemes are used to obtain variable voltage and
frequency supply. The most widely used PWM schemes for three-phase voltage source inverters are carrier- based
sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using space vector PWM (SVPWM)
because of their easier digital realization and better DC bus utilization [1-3]. Moreover, it gives a higher output voltage
for the same DC bus voltage, lower switching losses, and better harmonic performance in comparison to carrier based
sinusoidal pulse width modulation [4-5]. The space vector pulse width modulation of a three level inverter provides the
additional advantage of superior harmonic quality and larger under-modulation range that extends the modulation factor
to 90.7% from the traditional value of 78.5% in sinusoidal pulse width modulation. This paper focuses on SVPWM
implemented on an induction motor drive. The model of a three-phase voltage source inverter is presented based on space
vector theory.
2. SYSTEM DESCRIPTION
Fig.1 shows the basic circuit for the performance investigation of VSI-fed induction motor drive using SVPWM
technique. Fig.2 shows the simulation model for the performance investigation of VSI-fed induction motor drive using
SVPWM technique. The SVPWM voltage source inverter-fed induction motor drive system consist of an input LC filter,
a three-phase controlled rectifier, a DC link capacitor, a three-phase voltage source inverter, a squirrel-cage induction
motor and an output LC filter for controlling the speed of the induction motor.
Figure 1 Circuit model of the SVPWM VSI fed IM drive.
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International Journal of Application or Innovation in Engineering & Management (IJAIEM)
Web Site: www.ijaiem.org Email: editor@ijaiem.org, editorijaiem@gmail.com
Volume 2, Issue 12, December 2013
ISSN 2319 - 4847
3. PERFORMANCE INVESTIGATION OF THE DRIVE
A MATLAB/Simulink model is developed to examine the performance of the three-phase induction motor drive as shown
in Fig.2. A three-phase squirrel-cage induction motor rated 3 hp, 220 V, 60 Hz, 1725 rpm is fed by a three-phase IGBT
inverter connected to a DC link voltage source of 325 V. The firing pulses to the inverter are generated by the spacevector PWM modulator block of the SPS library. The chopping frequency is set to 1980 Hz and the input reference vector
to magnitude-angle. Speed control of the motor is performed by the constant V/Hz block. The magnitude and frequency of
the stator voltages are governed by the speed set point. By varying the stator voltage magnitude in proportion with
frequency, the stator flux is kept constant.
Figure 2 Simulink model of the SVPWM VSI fed IM drive System
The performance of the drive is investigated for the following loading conditions:
3.1 CASE 1: AT FULL LOAD (Tfl = 11.9 N-m.)
Simulation results of induction motor at full load are shown in figures 3-8. Figure 3 shows DC link voltage which is
found to be 309.6 V. Figure 4 shows inverter output voltage of which the peak amplitude is 309.6 V. The stator and rotor
currents are shown in figures 5-6. The starting current is high and within 0.85 second, it reaches to steady state value
10.72 A. Steady state value of rotor current is 8.735 A. The rotor speed is shown in figure 7 and it can be observed that
speed reaches at steady state value 1720 rpm within 0.85 second when motor is subjected to full load 11.9 N-m. Figure 8
shows the electromagnetic torque of the motor of which steady state value is 12.15 N-m.
Figure 3 DC link voltage (Case-1)
Volume 2, Issue 12, December 2013
Figure 4 Inverter output voltages (Case-1)
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International Journal of Application or Innovation in Engineering & Management (IJAIEM)
Web Site: www.ijaiem.org Email: editor@ijaiem.org, editorijaiem@gmail.com
Volume 2, Issue 12, December 2013
ISSN 2319 - 4847
Figure 5 Three-phase induction motor
stator current (Case-1)
Figure 6 Three-phase induction motor rotor
current (Case-1)
Figure
7 Three-phase induction motor rotor speed
(Case-1)
Figure 8 Three-phase induction motor
electromagnetic torque (Case-1)
3.2 CASE 2: AT NO LOAD CONDITION (T =0 N-m.)
Simulation results of induction motor at no load condition are shown in figures 9-14. Figure 9 shows DC link voltage
which is found to be 309.8 V. Figure 10 shows inverter output voltage of which the peak amplitude is 311 V. The stator
and rotor currents are shown in figures 11-12. The starting current is high and within 0.7 second, it reaches to steady
state value 2.495 A. Steady state value of rotor current is 0.03483 A. The rotor speed is shown in figure 13 and it can be
observed that speed reaches at steady state value 1800 rpm within 0.7 second when motor is subjected to no load. Figure
14 shows the electromagnetic torque of the motor of which steady state value is 0.1975 N-m.
Figure 9 DC link voltages (Case-2)
Figure 11 Three-phase induction motor stator current
Figure 13 Three-phase induction motor rotor speed (Case-2)
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Figure 10 Inverter output voltages (Case-2)
Figure 12 Three-phase induction motor rotor (Case-2)
current (Case-2)
Figure 14 Three-phase induction motor
Electromagnetic torque (Case-2).
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3.3 CASE 3: AT OVER LOAD CONDITION (T=15 N-m)
Simulation results of induction motor at over load condition are shown in figures 15-20. Figure 15 shows DC link voltage
which is found to be 309.2 V. Figure 16 shows inverter output voltage of which the peak amplitude is 309.3 V. The stator
and rotor currents are shown in figures 17-18. The starting current is high and within 0.9 second, it reaches to steady
state value 13.06 A. Steady state value of rotor current is 6.385A. The rotor speed is shown in figure 19 and it can be
observed that speed reaches at steady state value 1697 rpm within 0.9 second when motor is subjected to over load 15 Nm. Figure 20 shows the electromagnetic torque of the motor of which steady state value is 15.27 N-m.
Figure 15 DC link voltages (Case-3).
Figure 17 Three-phase induction motor stator current (Case-3)
Figure 19 Three-phase induction motor rotor speed (Case-3)
Figure 16 Inverter output voltages (Case-3)
Figure 18 Three-phase induction motor rotor
current (Case-3)
Figure 20 Three-phase induction motor
electromagnetic torque (Case-3)
3.4 CASE 4: AT UNDER LOAD CONDITION (T = 8 N-m)
Simulation results of induction motor at under load condition are shown in figure from figure 21-26. Figure 21 shows DC
link voltage which is found 309.6 V. Figure 22 shows inverter output voltage of which the peak amplitude is309.6 V. The
stator and rotor currents are shown in figures 23- 24. The starting current is high and within 0 .75 second, it reaches to
steady state value 7.896 A. Steady state value of rotor current is 5.065 A. The rotor speed is shown in figure 25 and it can
be observed that speed reaches at steady state value 1748 rpm within 0.75 second when motor is subjected to under load
8 N-m. Figure 26 shows the electromagnetic torque of the motor of which steady state value is 8.236 N-m.
Figure 21 DC link voltage (Case-4)
Volume 2, Issue 12, December 2013
Figure 22 Inverter output voltages (Case-4)
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International Journal of Application or Innovation in Engineering & Management (IJAIEM)
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Volume 2, Issue 12, December 2013
ISSN 2319 - 4847
Figure 23 Three-phase induction motor stator current (Case-4)
Figure 24 Three-phase induction motor
rotor current (Case-4)
Figure 25 Three-phase induction motor rotor speed (Case-4)
Figure 26 Three-phase induction motor
electromagnetic torque (Case-4).
Table 1 Performance investigation of VSI-fed induction motor drives using SVPWM technique at different loading
conditions
Performance
Quantities
Full Load
(11.9 N-m)
No Load
(0 N-m)
Over Load
(17 N-m)
Under Load
(8 N-m)
Stator Current(A)
10.72
2.495
13.06
7.896
Rotor Current (A)
8.735
0.03483
6.385
5.065
Speed (rpm)
Electromagnetic
Torque (N-m)
1720
1800
1697
1748
12.15
0.1975
15.27
8.236
0.85
0.7
0.9
0.75
Settling Time (s)
The facts and figures discussed in section-III have been summarized in Table 1.
References
[1] Khoudir Marouani, Lotfi Baghli, DjafarHadiouche, Abdelaziz Kheloui1, and Abderrezak Rezzoug, “Discontinuous
SVPWM Techniques for Double Star Induction Motor Drive Control,” IEEE,pp. 902-907, 2006.
[2] R. Rajendran and Dr. N. Devarajan, “FPGA Implementation of Space Vector PWM technique for Voltage Source
Inverter Fed Induction Motor Drive,” IEEE, pp. 422-426, 2009.
[3] Y. Zhao and T. A. Lipo, “Space Vector PWM Control of DualThree-phase Induction Machine using Vector Space
Decomposition,” IEEE Trans. Ind Appl., vol. 31, no. 5, pp. 1100– 1109, Sep./Oct. 1995.
[4] Comprehensive Analysis,” IEEE Transaction on Industrial Electronics, vol. 49, no.1, pp.186–196, Feb. 2002.H.
Bain, Z. Zhao, S. Meng, J. Liu, and X. Sun, “Comparison of Three PWM Strategies-SPWM, SVPWM & OnecycleControl,” in Proc. 5th International Conference on Power Electronics Drive system, vol. 2, pp. 1313-1316, 2003.
AUTHOR
Padma Chaturvedi was born in Kanpur (U.P.), India. She received her Bachelor degree in Electrical and
Electronics Engineering from U.P. Technical University, India. She did her Master of Technology from
Department of Electrical Engineering (Power Electronics and Drives), Kamala Nehru Institute of
Technology, Sultanpur, (U.P.) India. She worked as lecturer and Asst. Prof. in different Engineering colleges
of UP Technical University. Presently she is working as an Asst. Professor in Department of Electronics Engineering,
Maharana Pratap Engineering College Kanpur, UP, India. Her areas of interest are in the field of Power Electronics and
Drives, Fault Tolerance, Leakage and Power reduction in Semiconductor Devices and etc.
Volume 2, Issue 12, December 2013
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International Journal of Application or Innovation in Engineering & Management (IJAIEM)
Web Site: www.ijaiem.org Email: editor@ijaiem.org, editorijaiem@gmail.com
Volume 2, Issue 12, December 2013
ISSN 2319 - 4847
Amarish Dubey was born in Kanpur, (U.P.) India. He received his Bachelor degree in Electronics and
Communication Engineering from U.P. Technical University, INDIA. He has completed his Master of
Technology from Department of Electronics Engineering, Indian Institute of Technology (Banaras Hindu
University), Varanasi (U.P.) India. He worked as lecturer and Asst. Prof. in different Engineering colleges of
U.P. Technical University. Presently he is working as an Asst. Professor in Department of Electronics and
Communication Engineering, Rama Institute of Engineering and Technology, Kanpur (U.P.) India. His areas of interest
are Digital Design, Fault Tolerance, Leakage and Power reduction in VLSI Design, Radiation Effects in Semiconductor
Devices, Power Electronics and Drives and etc.
APPENDIX-I
Induction Motor Parameters
Voltage
220V
Nominal Power
2238W
Frequency
60Hz
Pole Pairs
2
Rated Load Torque
11.6 N-m
Speed
1725 rpm
Rotation Inertia
0.0879Kg-m2
Stator Resistance
0.435 ohm
Rotor Resistance
Stator Leakage
Inductance
Rotor Leakage
Inductance
0.816 ohm
Mutual Inductance
0.06931 H
Volume 2, Issue 12, December 2013
0.004 H
0.004 H
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