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Abstract
This paper presents the implementation of microcontroller based multilevel inverter using SVPWM technique. The output harmonic content is reduced by using multilevel inverter. The voltage and power increase with increase in the number of levels of inverter. The switching angle for the pulse is selected in such way to reduce the harmonic distortion. The model of the multilevel inverter system is developed with space vector modulation (SVM) strategy to run the induction motor. Space vector modulation technique is used to reduce the harmonics. Space vector modulation is required due to vector selection in d-q stationary reference frame.SVPWM technique proposed here can also work in over modulation range. The simulation work for space vector modulation and sinusoidal pulse width modulation (SPWM) are done and the results are compared. The THD content is reduced in case of SVM technique. In hardware, microcontroller based multilevel inverter is implemented. The hardware is implemented for a two level inverter. The multilevel inverter output has reduced harmonic level. A microcontroller based gating circuit generates the pulses required by the inverter. The multilevel inverter hardware is successfully fabricated and tested.
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