An Improved Modulation Strategy for Single-phase Three-level Neutral-point-clamped Converter in Critical Conduction Mode

Li, Ning, Cao, Yujie, Liu, Xiaokang, Zhang, Yan, Wang, Ruotong, Jiang, Lin ORCID: 0000-0001-6531-2791 and Zhang, Xiao-Ping (2024) An Improved Modulation Strategy for Single-phase Three-level Neutral-point-clamped Converter in Critical Conduction Mode Journal of Modern Power Systems and Clean Energy, 12 (3). pp. 981-990. ISSN 2196-5625, 2196-5420

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Abstract

Two-level totem-pole power factor correction (PFC) converters in critical conduction mode (CRM) suffer from the wide regulation range of switching frequency. Besides, in high-frequency applications, the number of switching times increases, resulting in significant switching losses. To solve these issues, this paper proposes an improved modulation strategy for the single-phase three-level neutral-point-clamped (NPC) converter in CRM with PFC. By optimizing the discharging strategy and switching state sequence, the switching frequency and its variation range have been efficiently reduced. The detailed performance analysis is also presented regarding the switching frequency, the average switching times, and the effect of voltage gain. A 2 kW prototype is built to verify the effectiveness of the proposed modulation strategy and analysis results. Compared with the totem-pole PFC converter, the switching frequency regulation range of the three-level PFC converter is reduced by 36%, and the average switching times is reduced by 45%. The experimental result also shows a 1.2% higher efficiency for the three-level PFC converter in the full load range.

Item Type:	Article
Uncontrolled Keywords:	Switches, Switching frequency, Control systems, Topology, Bridge circuits, Inductors, Customer relationship management, Critical conduction mode (CRM), on-board charger, switching frequency range, switching times, power factor correction (PFC), three-level converter
Depositing User:	Symplectic Admin
Date Deposited:	28 Jun 2024 10:19
Last Modified:	28 Feb 2026 20:50
DOI:	10.35833/mpce.2023.000210
Open Access URL:	https://www.mpce.info/mpce/article/pdf/202403026
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3182529
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