Performance of Sinusoidal Pulse Width Modulation based Three Phase Inverter

In this paper a new sinusoidal PWM inverter suitable for use with power MOSFETs is described. . The output waveforms in the proposed PWM inverter are investigated both theoretically and experimentally. The fundamental component of the three-phase line-to-line voltage is increased by about 15 percent above than that of the conventional sine-wave inverter. The sinusoidal PWM switching scheme allows control of the magnitude and the frequency of the output voltage. Therefore, the input to the PWM inverters is an uncontrolled, essentially constant dc voltage source. This switching scheme results in harmonic voltage in the range of the switching frequency and higher, which can be easily filtered out. This Paper proposes several carrier based modulation techniques for full bridge inverter. In this paper, various pulse width modulation techniques are implemented, which can minimize the total harmonic distortion and enhances the output voltages. The methodologies adopting the constant switching frequency, variable switching frequency multicarrier, phase shifted carrier pulse width modulation concepts are implemented in this paper. The above methodologies divided in to two techniques, triangular carrier and sawtooth carrier for gate signal generation. In this paper, simulation of three phase inverter using sawtooth waveform as carrier signal has been done. Another method using asymmetrical modulation technique with triangular waveform as a carrier signal has been done.