sine pulse width modulation inverter
TRANSCRIPT
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MATLAB SIMULATION OF
SPWM Inverter Using
Bipolar and Unipolar Switching Strategy
Aditya ParmarB.Tech Electrical Engineering
Charotar University Of Science & TechnologyChanga - Anand
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OBJECTIVE: To analyze the output voltage of a SPWM inverter using FFT.
■ In most of the inverter applications, the magnitude of the output AC voltage and the input DC voltage varies continuously.
■ This requires continous variation of the control pulse width inorder to achieve the desired output voltage waveform.
■ In this method a reference signal is compared with a high frequency triangular wave to generate PWM signal.
■ If the reference signal is a sine wave, the modulation is called Sine wave pulse width modulation(SPWM).
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■ The SPWM is realized by comparing a sine wave reference signal(Vr) with a high frequency triangular or sawtooth wave carrier signal(Vc).
■ The ratio Vr/Vc is called the modulation index and it determines the harmonic content in the inverter output voltage wave form.
■ The frequency of the reference signal determines the inverter output frequency and its peak magnitude determines the modulation index which inturn determines the RMS output voltage.
■ When the reference signal is compared with the carrier signal, their intersection determines the switching instants of the inverter switches.
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CIRCUIT DIAGRAM OF BIPOLAR SWITCHING
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OUTPUT WAVEFORMS
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FFT Analysis
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CIRCUIT DIAGRAM OF BIPOLAR SWITCHING
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OUTPUT WAVEFORM
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FFT Analysis
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CONCLUSION
■ A SPWM inverter was simulated and FFT analysis was made in Matlab for the 2 different switching strategies. It was found that unipolar inverter with a filter circuit will give better sinusoidal output waveform compared to bipolar inverter.
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THANK YOUFor Matlab Simulation FileDownload Following Files:
http://downloads.ziddu.com/download/25104164/unipolar_SPWM_Copy.pdf.htmlhttp://downloads.ziddu.com/download/25104163/Bipolar_SPWM_Copy.pdf.html
http://downloads.ziddu.com/download/25104161/Instruction.txt.html