Quantitative Analysis of Balancing Range for Single-Phase 3L-NPC Converters

Ziying Wang, Ning Jiao (), Shunliang Wang, Junpeng Ma, Rui Zhang and Tianqi Liu
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Ziying Wang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Ning Jiao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Shunliang Wang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Junpeng Ma: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Rui Zhang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Tianqi Liu: College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2024, vol. 17, issue 6, 1-17

Abstract: Multiple techniques have been suggested to achieve control balance in single-phase three-level neutral-point clamped (3L-NPC) converters. Nevertheless, there is a deficiency of quantitative calculations related to the extent of balancing. Operating beyond the balancing range may result in a sequence of safety incidents. This paper presents a conceptualization of the 3L-NPC converter as two cascaded H-bridges. By employing power conservation principles, the balancing range for the NPC converter is derived, and two novel methods are investigated to broaden the balance range in accordance with the calculated balance range. A comparison is made among the balancing ranges under different balancing control methods. This study establishes a theoretical foundation to ensure the secure and stable operation of the NPC converter.

Keywords: 3L-NPC converter; single phase; voltage balance; balancing range (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: 2024
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