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In this paper, a modulation strategy based on the circuit-level decoupling concept is proposed and investigated for the three-level four-leg neutral-point-clamped (NPC) inverter,with the aim of delivering power to all sorts of loads, linear/nonlinear and balanced/unbalanced. By applying the proposed modulation strategy, the four-leg NPC inverter can be decoupled into three three-level Buck converters in each defined operating section. This makes the controller design much simpler compared to the conventional four-leg NPC inverter controllers. Also, this technique can be implemented with a simple logic and can be processed very quickly. Moreover, the switching loss is reduced substantially and the dc-link capacitors’ voltages balance is also achieved without any feedback control. The proposed modulation technique is verified by the experiment.
Original languageEnglish
TitleProceedings of The International Power Electronics and Motion Control Conference (IPEMC)
PublisherIEEE
Publication date2012
Pages274
Chapter280
ISBN (print)978-1-4577-2087-1
DOIs
StatePublished

Conference

ConferenceThe International Power Electronics and Motion Control Conference
CountryChina
CityHarbin
Period02/06/1205/06/12
CitationsWeb of Science® Times Cited: No match on DOI

Keywords

  • Circuit-level decoupling, Inverter, Neutral-pointclamped, PWM modulation, Three-level, Capacitors, Phase modulation, Voltage Control
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