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

Le Yu, Xu Peng and Shibin Gao
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Le Yu: School of Electrical Engineering Southwest Jiaotong University Chengdu, Chengdu 610000, China
Xu Peng: Aviation Engineering Institute, Civil Aviation Flight University Chengdu, Chengdu 618307, China
Shibin Gao: School of Electrical Engineering Southwest Jiaotong University Chengdu, Chengdu 610000, China

Energies, 2019, vol. 12, issue 20, 1-17

Abstract: 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.

Keywords: three-level neutral point clamped cascaded converter; sequence pulse modulation; voltage-balancing; level jump (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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