Open AccessMitigating the dead-time effects on harmonics spectrum of inverter waveform by the confined band VSFPWM technique
Author(s) -
Hussain Attia,
Hang Seng,
Freddy Tan Kheng Suan,
Ahmad Elkhateb
Publication year - 2021
Publication title -
international journal of power electronics and drive systems/international journal of electrical and computer engineering
Language(s) - English
Resource type - Journals
eISSN - 2722-2578
pISSN - 2722-256X
DOI - 10.11591/ijpeds.v12.i1.pp295-303
Subject(s) - harmonics , inverter , pulse width modulation , total harmonic distortion , waveform , dead time , harmonic spectrum , power (physics) , voltage , modulation (music) , matlab , control theory (sociology) , harmonic , distortion (music) , computer science , electronic engineering , physics , electrical engineering , telecommunications , acoustics , engineering , bandwidth (computing) , amplifier , control (management) , quantum mechanics , artificial intelligence , operating system
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.