A Direct Voltage Unbalance Compensation Strategy for Islanded Microgrids

Xin Zhao, Xiaohua Wu, Lexuan Meng, Josep M. Guerrero, Juan Carlos Vasquez

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

12 Citations (Scopus)
1027 Downloads (Pure)

Abstract

In this paper, a control strategy with low bandwidth communications for paralleled three-phase inverters is proposed to achieve satisfactory voltage unbalance compensation. The proposed control algorithm mainly consists of voltage/current inner loop controllers, a droop controller, a selective virtual impedance loop, and an unbalance compensator. The inner loop controllers are based on the stationary reference frame to better mitigate the voltage distortion under nonlinear loads. Droop control and selective virtual impedance loop achieve accurate current-sharing when supplying both linear and nonlinear loads. Moreover, by adjusting voltage references according to the amplitude of the negative sequence voltage, the unbalance factor, which is mainly caused by single phase generators/loads, can be mitigated to an extremely low value. Finally, an AC microgrid which includes three three-phase three-leg inverters was tested in order to validate the proposed control strategy.
Original languageEnglish
Title of host publicationProceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)
Number of pages8
PublisherIEEE Press
Publication dateMar 2015
Pages3252 - 3259
ISBN (Print)978-1-4799-6735-3
DOIs
Publication statusPublished - Mar 2015
Event30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015 - Charlotte, United States
Duration: 15 Mar 201519 Mar 2015

Conference

Conference30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015
CountryUnited States
CityCharlotte
Period15/03/201519/03/2015
SeriesI E E E Applied Power Electronics Conference and Exposition. Conference Proceedings
ISSN1048-2334

Keywords

  • Microgrids
  • Droop control
  • Virtual impedance
  • Voltage unbalance compensation

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  • Cite this

    Zhao, X., Wu, X., Meng, L., Guerrero, J. M., & Vasquez, J. C. (2015). A Direct Voltage Unbalance Compensation Strategy for Islanded Microgrids. In Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC) (pp. 3252 - 3259 ). IEEE Press. I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings https://doi.org/10.1109/APEC.2015.7104818