Mitigating the Dead-time Effects on Harmonics Spectrum of Inverter Waveform by the Confined Band VSFPWM Technique

H Attia, Hang Seng Che, Freddy Tan Suan, Ahmad Elkhateb

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Abstract

The dead-time is necessary to be inserted between the gates drive pulses of the two power electronic switches in a one leg of any inverter to avoid a short circuit in the leg and the DC supply as well. However, adding the dead-time increases the low order harmonics of the output voltage/current waveform of the inverter. This paper investigates the positive effects of decreasing the Pulse Width Modulation PWM drive pulses number per fundamental period on the current low order harmonics. In addition, this paper evaluates the impact of the Confined Band Variable Switching Frequency Pulse Width Modulation CBVSFPWM technique on inverter performance in terms of dead-time mitigating, and consequenctely lowering the low order harmonics. CBVSFPWM technique reduces the Total Harmonic Distortion THD levels in the inverter output current as well. Theoretical analysis of the CB-VSFPWM effectiveness in reducing the negative effect of the dead-time has explained in this study and confirmed by the MATLAB/Simulink simulation results.
Original languageEnglish
Pages (from-to)295-303
Number of pages9
JournalInternational Journal of Power Electronics and Drive Systems (IJPEDS)
Volume12
Issue number1
DOIs
Publication statusPublished - Mar 2021

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