A compact seven switches topology and reduced DC-link capacitor size for single-phase stand-alone PV system with hybrid energy storages

Xiong Liu, Peng Wang, Poh Chiang Loh, Frede Blaabjerg, Feng Gao

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

5 Citations (Scopus)

Abstract

Single-phase stand-alone PV system is suitable for household applications in remote area. Hybrid battery/ultra-capacitor energy storage can reduce charge and discharge cycles and avoid deep discharges of battery. This paper proposes a compact seven switches structure for stand-alone PV system, which otherwise needs nine switches configuration, inclusive of one switch for boost converter, four switches for single-phase inverter and four switches for two DC/DC converters of battery and ultra-capacitor. It is well-known that a bulky DC-link capacitor is always required to absorb second-order harmonic current caused by single-phase inverter. In the proposed compact topology, a small size DC-link capacitor can achieve the same function through charging/discharging control of ultra-capacitor to mitigate second-order ripple current. Simulation results are provided to validate the effectiveness of the topology and control schemes of the proposed system.
Original languageEnglish
Title of host publicationProceedings of the 26th Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2011)
Number of pages6
PublisherIEEE Press
Publication dateMar 2011
Pages1920-1925
ISBN (Print)978-1-4244-8084-5
DOIs
Publication statusPublished - Mar 2011

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