A Seven-Switch Five-Level Active-Neutral-Point-Clamped Converter and Its Optimal Modulation Strategy

Multilevel inverters are receiving more attentions nowadays as one of preferred solutions for medium- and high-power applications. As one of the most popular hybrid multilevel inverter topologies, the five-level active-neutral-point-clamped inverter (5L-ANPC) combines the features of the conventiona...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-07, Vol.32 (7), p.5146-5161
Main Authors: Hongliang Wang, Lei Kou, Yan-Fei Liu, Sen, Paresh C.
Format: Article
Language:English
Subjects:
Active-neutral-point-clamped (ANPC) inverter
Capacitors
Converters
Diodes
flying-capacitor (FC)
Industrial applications
Inverters
Modulation
multilevel inverter
Power factor
pulse width modulation (PWM)
Reactive power
Switches
Topology
Voltage control
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Summary:Multilevel inverters are receiving more attentions nowadays as one of preferred solutions for medium- and high-power applications. As one of the most popular hybrid multilevel inverter topologies, the five-level active-neutral-point-clamped inverter (5L-ANPC) combines the features of the conventional flying-capacitor type and neutral-point-clamped (NPC) type inverter and was commercially used for industrial applications. In order to further decrease the number of active switches, this paper proposes a seven-switch 5L-ANPC (7S-5L-ANPC) topology, which employs only seven active switches and two discrete diodes. The analysis has shown a lower current rating can be selected for the seventh switch under high power factor condition, which is verified by simulation results. The modulation strategy for 7S-5L-ANPC inverter is discussed. A 1 kVA single-phase experimental prototype is built to verify the validity and flexibility of the proposed topology and modulation method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2614265