Seven-Level PWM Inverter Employing Series-Connected Capacitors Paralleled to a Single DC Voltage Source

This paper presents an effective circuit configuration of a multilevel inverter that can increase the number of output voltage levels with a reduced number of circuit components. The proposed seven-level pulsewidth-modulation inverter consists of a single dc voltage source with a series of capacitor...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2015-06, Vol.62 (6), p.3448-3459
Main Authors: Choi, Jin-Sung, Kang, Feel-soon
Format: Article
Language:English
Subjects:
Capacitors
Circuits
Direct current
Discharges (electric)
Electric potential
Inverters
multilevel systems
phase disposition (PD)
Pulse duration modulation
Pulse width modulation
pulse width modulation (PWM)
Strategy
Switches
total harmonic distortion (THD)
Voltage
Voltage control
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Summary:This paper presents an effective circuit configuration of a multilevel inverter that can increase the number of output voltage levels with a reduced number of circuit components. The proposed seven-level pulsewidth-modulation inverter consists of a single dc voltage source with a series of capacitors, diodes, active switches for synthesizing output voltage levels, and an H-bridge cell. After theoretical analysis, we carry out computer-aided simulations and experiments to verify the validity of the proposed approach. Here, we also introduce a modified switching strategy to solve the capacitor voltage unbalancing that occurs in series-connected capacitors.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2014.2370948