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

Le Yu, Xu Peng, Chao Zhou and Shibin Gao
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Le Yu: School of Electrical Engineering, Jiaotong University Chengdu, Chengdu 611756, China
Xu Peng: Aviation Engineering Institute Civil, Aviation Flight University, Guanghan 618307, China
Chao Zhou: Aviation Engineering Institute Civil, Aviation Flight University, Guanghan 618307, China
Shibin Gao: School of Electrical Engineering, Jiaotong University Chengdu, Chengdu 611756, China

Energies, 2020, vol. 13, issue 18, 1-18

Abstract: Three-level neutral-point clamped cascaded converters (3LNPC-CC) are widely used in high power nigh-voltage applications. This paper mainly discusses the open-circuit fault in DC-side of the 3LNPC-CC. Optimized by the sequence pulse modulation, a sequence smooth modulation (SSM) is proposed to keep the DC-side voltage balance while the 3LNPC-CC suffers open-circuit fault from DC-side. The SSM found efficient switch-state path through a 3-D cube model and simplified the path from thousands of switch state. The SSM avoids the complex calculation in the voltage-balancing modulation, while the dynamic character of it was less influenced. At the same time, the modulation changes the voltage level smoothly and balances the fault DC-side voltage effectively. The characters of the proposed modulation are verified by the simulation and the experiment.

Keywords: 3LNPC-CC; voltage-balancing; sequence smooth modulation open-circuit fault (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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