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Open AccessArticle

Voltage-Balancing Strategy for Three-Level Neutral Point Clamped Cascade Converter under Sequence Pulse Modulation

1
School of Electrical Engineering Southwest Jiaotong University Chengdu, Chengdu 610000, China
2
Aviation Engineering Institute, Civil Aviation Flight University Chengdu, Chengdu 618307, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3829; https://doi.org/10.3390/en12203829
Received: 29 August 2019 / Revised: 30 September 2019 / Accepted: 3 October 2019 / Published: 10 October 2019
(This article belongs to the Special Issue Function Design and Control of Multilevel Converters)
In response to the unbalanced DC-port fault of three-level neutral point clamped cascaded converter (3LNPC-CC), a sequence pulse modulation (SPM) voltage-balancing strategy is proposed in this paper to balance DC-link voltage, not only within the module but also among modules. With the steps of carrier cascaded calculation and sequence pulse generator, the voltage level of cascaded modules would take a smooth transition. Then the limitation of the SPM strategy is calculated according to the law of volt-second balance and the law of energy conservation. The proposed strategy has the advantage of simple calculation and control stability. Simulation and experimental results show the superiority of the proposed strategy. View Full-Text
Keywords: three-level neutral point clamped cascaded converter; sequence pulse modulation; voltage-balancing; level jump three-level neutral point clamped cascaded converter; sequence pulse modulation; voltage-balancing; level jump
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Yu, L.; Peng, X.; Gao, S. Voltage-Balancing Strategy for Three-Level Neutral Point Clamped Cascade Converter under Sequence Pulse Modulation. Energies 2019, 12, 3829.

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