A novel soft-switching grid-connected PV inverter and its implementation

Minjie Chen, Xutao Lee, Yoshihara Tsutomu

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    This paper proposes a novel soft-switching PV inverter formed by a ZVT-PWM boost converter, a ZVS-ZCS-PWM buck converter and a low frequency full-bridge inverter. The ZVT-PWM boost converter maintains the dc-bus voltage and provides an auxiliary current source for the soft-switching cell of the buck converter. The buck converter consists of a main switch and an auxiliary switch, with ZVS and ZCS features respectively, which generates a semi-sinusoidal current output. The semi-sinusoidal current is inverted into sinusoidal and fed to the utility grid by the low frequency full-bridge inverter. The overall efficiency is improved and the size is dramatically reduced due to high frequency operation. The operating principles are presented and the circuit is implemented to a 1000W prototype machine. The experimental results with a maximum overall efficiency up to 97% at 100 kHz, about 1.5%'s improvement compared to the hard-switching one, verify the proposal.

    Original languageEnglish
    Title of host publicationProceedings of the International Conference on Power Electronics and Drive Systems
    Pages373-378
    Number of pages6
    DOIs
    Publication statusPublished - 2011
    Event2011 IEEE 9th International Conference on Power Electronics and Drive Systems, PEDS 2011 - Singapore
    Duration: 2011 Dec 52011 Dec 8

    Other

    Other2011 IEEE 9th International Conference on Power Electronics and Drive Systems, PEDS 2011
    CitySingapore
    Period11/12/511/12/8

    Keywords

    • boost converter
    • buck converter
    • full-bridge inverter
    • Grid-Connected PV Inverter
    • ZVS-ZCS-PWM
    • ZVT-PWM

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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