this presentation is about the modelling and simulation of three phase pure sine wave inverter

2. Department of Electrical Engineering,
HITEC University ,Taxila
Pure Sine Wave Inverter
Group No: 16
Project Advisor: Dr. Aashiq Hussain
2Undergraduate Final Year Project

3. Undergraduate Final Year Project 3
Group Members
Asad Ullah Abbas
14-EE(P)-014
Ayesha Saman
14-EE(P)-017
Asad Ali
14-EE(P)-012
Mohsin Azeem
14-EE(P)-035

4. Contents
• Introduction
• Problem statement
• Proposed solution
• Topologies of inverter
• Methodology
• Why PWM technique
• Block diagram
• Sine PWM based three phase inverter
• MATLAB simulation and result
• Space vector based three phase inverter
• MATLAB simulation and result
• Conclusion
• Project timeline
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5. Pure Sine Wave Inverter
An inverter is an electric apparatus that changes direct current (DC) to alternating current (AC)
A true sine wave inverter produces output with the lowest total harmonic distortion (normally below 3%).
There are usually two types of inverter
Single phase inverters
Three phase inverters
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6. Problem Statement
• Square wave produced causes irritating humming noise and greater
number of harmonics which produces heating effect and can result in
damage of our electrical appliances.
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7. Proposed Solution
• The proposed solution is obviously to use Pure Sine wave inverter
whose output is very close to the AC current. It is very pure form
compared to Square wave output. Offers less harmonics due to which
heating effect is minimized
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8. Topologies Of Inverters
• Voltage Source Inverter (VSI)
• Where the independently controlled ac output is a voltage waveform.
• In industrial markets, the VSI design has proven to be more efficient, have
higher reliability and faster dynamic response, and be capable of running
motors without de-rating.
• Current Source Inverter (CSI)
• Where the independently controlled ac output is a current waveform.
• These structures are still widely used in medium-voltage industrial
applications, where high-quality voltage waveforms are required.
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10. Methodology
Most common techniques used in pure sine wave inverter are :
• SINE PWM
• Space Vector
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11. Why use PWM techniques?
• To control inverter output frequency
• To control inverter output voltage (fundamental)
• To minimize harmonic distortion
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Block Diagram

13. Sine PWM Based Three Phase Inverter
• Sinusoidal PWM is a type of "carrier-based" pulse width modulation.
Carrier based PWM uses pre-defined modulation signals to determine
output voltages. In sinusoidal PWM, the modulation signal is
sinusoidal, with the peak of the modulating signal always less than
the peak of the carrier signal.
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14. Inverter Configuration And Waves
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15. MATLAB Simulation OF SPWM Based Three Phase
Inverter
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16. Simulation Result
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17. Line Voltages
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FFT analysis
Modulation = 0.45 Modulation = 0.95

19. Filtered voltages
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FFT analysis
Modulation = 0.45 Modulation = 0.95

21. Space Vector PWM Based Three Phase Inverter
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• The space vector PWM (SVM) method is an advanced computation-
intensive PWM method and is possibly the best method among the
all PWM techniques for variable- frequency drive application. Because
of its superior performance characteristics, it has been finding wide
spread application in recent years

22. Principle Of Space Vector PWM
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• Treats the sinusoidal voltage as a constant amplitude vector rotating at constant frequency.
• This PWM technique approximates the reference voltage Vref by a combination of the eight switching
patterns (V0 to V7)

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Representation in Alpha-Beta plane
Non zero switching state zero switching state

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Output Waveform

25. MATLAB Simulation of Space Vector PWM Based
Three Phase Inverter
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26. Simulation Results
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27. Line Voltages
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28. FFT Analysis
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Modulation index =0.45 Modulation index =0.95

29. Filtered Voltages
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30. FFT Analysis
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Modulation index=0.45 Modulation index=0.95

31. Conclusion
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• From all the simulation result it is clear that SVPWM after filtration
has less THD as compared to that of SPWM
• Less ripples and more sine wave at output is achieved with SVPWM as
compared to SPWM

32. Project Timeline
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`
NOV DEC JAN FEB MAR APR
Literature Review
Paper Implementation
(simulation)
Modification if needed
and HARDWARE fabrication
On Time!
In Sha ALLAH

33. References
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• K. Vinoth Kumar, Prawin Angel Michael, Joseph P. John and Dr. S. Suresh Kumar “ SIMULATION
AND COMPARISON OF SPWM AND SVPWM CONTROL FOR THREE PHASE INVERTER”
• T. Erfidan, S. Urugun, Y. Karabag and B. Cakir. 2004. “ Software implementation of the Space
Vector Modulation. Proceedings of IEEE Conference. pp.1113-1115”

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