An Enhanced Droop Control Scheme for Resilient Active Power Sharing in Paralleled Two-Stage PV Inverter Systems

Hongpeng Liu, Yongheng Yang, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg, Wei Wang, Dianguo Xu

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

3 Citations (Scopus)

Abstract

Traditional droop-controlled systems assume that the generators are able to provide sufficient power as required. This is however not always true, especially in renewable systems, where the energy sources (e.g., photovoltaic source) may not be able to provide enough power (or even loss of power generation) due to the intermittency. In that case, unbalance in active power generation may occur among the paralleled systems. Additionally, most droop-controlled systems have been assumed to be a single dc-ac inverter with a fixed dc input source. The dc-dc converter as the front-end of a two-stage photovoltaic (PV) system has not been considered. In this paper, an enhanced droop scheme is thus proposed to address those issues, and the proposed scheme can enable resilient active power sharing in parallel two-stage PV inverter systems. Furthermore, a small-signal analysis for the proposed droop control strategy is carried out. Experiments have verified the effectiveness of the proposed droop control scheme.
Original languageEnglish
Title of host publicationProceedings of the 31st Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Number of pages8
PublisherIEEE
Publication dateMar 2016
Pages1253-1260
ISBN (Print)978-1-4673-8394-3, 978-1-4673-8393-6, 978-1-4673-9551-9
ISBN (Electronic)978-1-4673-9550-2
DOIs
Publication statusPublished - Mar 2016
Event31st Annual IEEE Applied Power Electronics Conference and Exposition - Long Beach Convention Center, Long Beach, United States
Duration: 20 Mar 201625 Mar 2016
http://www.apec-conf.org

Conference

Conference31st Annual IEEE Applied Power Electronics Conference and Exposition
LocationLong Beach Convention Center
CountryUnited States
CityLong Beach
Period20/03/201625/03/2016
Internet address

Keywords

  • Microgrid
  • Two-stage PV systems
  • Single-phase systems
  • Droop control
  • Active power sharing
  • Small-signal modelling

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