Performance study of a modified sine wave inverter

Abstract EN

This paper presents the performance of a modified sine wave voltage source inverter with duty cycle.

Evaluation of quality factors like the Total Harmonic Distortion THD of the output voltage for various values of switching-on angleα indicates that the minimum harmonic distortion occurs at α=23.2180, where the THD is 28.96% , about 60% of that of the square wave.

The 3rd harmonic is about 12.61% of the fundamental, and about third of the square wave.

The current paper, illustrates the inverter waveforms and how different types of loads behave when operating from them.

Therefore, the THD of the output current depends on the load types.

Results of typical load types are presented.

No heavy filters or complex timing circuits are necessary; therefore, the resulting inverter is smaller, lighter weight, and simpler, implying greater reliability and lower cost.

These advantages invite a closer look at inverter-motor systems.

Variations in induction motor performance may occur when the motor is driven from a modified sine wave inverter rather than a sine wave source.