Mitigating the dead-time effects on harmonics spectrum of inverter waveform by the confined band vsfpwm technique
Document Type
Article
Publication Date
1-1-2021
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 (CB-VSFPWM) technique on inverter performance in terms of dead-time mitigating, and consequenctely lowering the low order harmonics. CB-VSFPWM 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. © 2021, Institute of Advanced Engineering and Science. All rights reserved.
Keywords
Confined band variable switching frequency pulse width modulation, Constant switching freuency pulse width modulation, Dead-time, Harmonics spectrum, Low order harmonics, MATLAB/Simulink, Single-phase inverter, THD
Divisions
umpedac
Funders
Ministry of Higher Education, Malaysia
Publication Title
International Journal of Power Electronics and Drive Systems
Volume
12
Issue
1
Publisher
Institute of Advanced Engineering and Science