DocumentCode :
59818
Title :
Level- and Phase-Shifted PWM for Seven-Level Switched-Capacitor Inverter Using Series/Parallel Conversion
Author :
Tsunoda, Asuka ; Hinago, Youhei ; Koizumi, Hirotaka
Author_Institution :
Dept. of Electr. Eng., Tokyo Univ. of Sci., Tokyo, Japan
Volume :
61
Issue :
8
fYear :
2014
fDate :
Aug. 2014
Firstpage :
4011
Lastpage :
4021
Abstract :
This paper presents a comparison of two modulation methods for the seven-level switched-capacitor (SC) inverter using series/parallel conversion (SCISPC). The SCISPC is a multilevel inverter which has the less number of switching devices than the conventional multilevel inverters. The level-shifted pulsewidth modulation (PWM) (LS-PWM) was applied to the seven-level SCISPC in the previous research. In this paper, the level- and phase-shifted PWM (LPS-PWM) and the LS-PWM are applied to the seven-level SCISPC, and LPS-PWM is compared with LS-PWM for the seven-level SCISPC. The LPS-PWM has both the characteristics of the phase-shifted PWM (PS-PWM) and the LS-PWM. The voltage reduction during the discharging term of the SCs is reduced by means of the shorter discharging period compared to LS-PWM. The voltage ripple of the capacitors is also reduced, which leads to higher power conversion efficiency. The difference of the two modulation methods is confirmed by the theoretical approach, simulation with PSIM, and circuit experiment.
Keywords :
PWM invertors; switched capacitor networks; switching convertors; LPS-PWM; PSIM; SC; SCISPC; level-phase-shifted pulsewidth modulation; modulation method; multilevel inverter; power conversion efficiency; series-parallel conversion; seven-level switched-capacitor inverter; voltage reduction; voltage ripple; Capacitance; Capacitors; Inverters; Pulse width modulation; Switches; Switching loss; Inverters; multilevel systems; pulse width modulated inverters;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2013.2286559
Filename :
6642040
Link To Document :
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