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A fast-processing modulation strategy for three-phase four-leg neutral-point-clamped inverter based on the circuit-level decoupling concept

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4 Author(s)
Ghoreishy, Hoda ; Department of Electrical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark ; Zhe Zhang ; Thomsen, Ole C. ; Andersen, M.A.E.

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.

Published in:

Power Electronics and Motion Control Conference (IPEMC), 2012 7th International  (Volume:1 )

Date of Conference:

2-5 June 2012

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