Nonisolated switching-capacitor-integrated three- port converters with seamless PWM/PFM modulation

Peichao Xu, Huiqing Wen*, Wanjun Hao, Yong Yang, Jieming Ma, Yiwang Wang, Jiafeng Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Efficiency and power density of power converters for interfacing photovoltaic panels, energy storage components such as batteries, and loads in photovoltaic (PV) systems become more and more important. Compared with individual converter design for different terminals, power-integrated multiport converters shows obvious advantages in simplifying the system structure, reducing the component count, and improving the operation reliability. Originated from the high power-density switched capacitor topology, a nonisolated switching-capacitor-integrated three-port converter (SCI-TPC) is presented to achieve single-stage direct power conversion among three ports. In order to minimize the cross-regulation effect, pulse-width-modulation (PWM) and pulse-frequency-modulation (PFM) are adopted to realize the flexible power regulation and achieve power balance among three ports. Main operation modes, power flow distribution, and power transfer characteristic are analyzed. With the seamless PWM and PFM hybrid modulation, the current stress can be reduced and the overall conversion efficiency over a full operating range can be improved. Main experimental results are provided to validate the effectiveness of the proposed concept.

Original languageEnglish
Pages (from-to)160-174
Number of pages15
JournalSolar Energy
Volume224
DOIs
Publication statusPublished - Aug 2021

Keywords

  • PWM/PFM modulation
  • Soft-switching
  • Switched capacitor converter (SCC)
  • Three-port converter (TPC)

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