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

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

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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 increas-es,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 varia-tion range have been efficiently reduced.The detailed perfor-mance analysis is also presented regarding the switching fre-quency,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 reg-ulation range of the three-level PFC converter is reduced by 36.48％and the average switching times is reduced by 45.10％.The experimental result also shows a 1.2％higher efficiency for the three-level PFC converter in the full load range.

Critical conduction mode(CRM)on-board chargerswitching frequency rangeswitching timespower fac-tor correction(PFC)three-level converter

Ning Li、Yujie Cao、Xiaokang Liu、Yan Zhang、Ruotong Wang、Lin Jiang、Xiao-Ping Zhang

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School of Electrical Engineering,Xi'an University of Technology,Xi'an,China

Department of Electronics,Informa-tion and Bioengineering,Politecnico di Milano,Milan,Italy

Xi'an Jiaotong University,Xi'an,China

Department of Electrical Engineering and Electronics,University of Liverpool,Liverpool,U.K.

Department of Electronic,Electrical and Systems En-gineering,University of Birmingham,Birmingham,U.K.

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National Natural Science Foundation of ChinaChina Scholarship Council(CSC)State Scholarship Fund International Clean Energy Talent Project

52177193[2019]157

2024

10.35833/MPCE.2023.000210

现代电力系统与清洁能源学报(英文版)

现代电力系统与清洁能源学报(英文版)

ISSN：
年,卷(期)：2024.12(3)
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