Abstract
Due to the advent of technology, electronic equipments are much more sensitive to harmonic and its analysis play an important role whereby reducing the distortion due to harmonics needs attention. To meet the requirements of the industries, harmonic free-high rating power sources are in high demand. Total Harmonic Distortion (THD) is an indicator of AC voltage source quality. In case of inverters, one such way to reduce THD would be the use of Pulse Width Modulation (PWM). The existing methods mainly use the low frequency pulse width modulation techniques for the switching. Control methods employing high frequency switching techniques held in controlling THD with proper application of filters. This paper analyses THD in multilevel inverters using multicarrier PWM technique with five pulse width modulation technique through MATLAB simulations. Finally, a comparison is done to find the less harmonic generated PWM method using fewerfilters.
Highlights
Practical industrial inverters are of non- sinusoidal in nature and are prone to harmonics
LS-Pulse Width Modulation (PWM) technique is further grouped into Phase Disposition PWM (PD-PWM), Phase Opposition and Disposition PWM (PODPWM), and Alternative Phase Opposition and Disposition PWM (APOD-PWM)
Three level inverter Five level inverter Phase disposition Phase opposition disposition Alternate phase opposition disposition Phase shifted PWM In the simulation of the various types of Multi-Level Inverters (MLIs)’s using different PWM techniques, we analyzed the harmonics through the FFT analysis tool in the MATLAB
Summary
Practical industrial inverters are of non- sinusoidal in nature and are prone to harmonics. In case of low- power applications, voltage of quasi squared or pulse waveform is desired but high and moderate power applications warrant sinusoidal output waveforms with minimum distortion. Use of filters and certain techniques like PWM minimize the harmonics in the inverter’s output. The former poses some demerits like size, cost etc. While the later helps in reducing the usage of filters The former poses some demerits like size, cost etc. while the later helps in reducing the usage of filters
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