An estimator-based distributed voltage-predictive control strategy for ac islanded microgrids

Yanbo Wang, Zhe Chen, Xiongfei Wang, Yanjun Tian, Yongdong Tan, Chao Yang

Research output: Contribution to journalJournal articleResearchpeer-review

60 Citations (Scopus)

Abstract

This paper presents an estimator-based voltage predictive control strategy for AC islanded microgrids, which is able to perform voltage control without any communication facilities. The proposed control strategy is composed of a network voltage estimator and a voltage predictive controller for each distributed generator, where the voltage estimator serves as an essential tool to obtain network voltages response without using communication links, while the voltage predictive controller is able to implement offset-free voltage control for a specified bus. The dynamic performance of the proposed voltage control strategy is analyzed through small signal analysis method, from which the design guideline for the controller parameters is formulated. Furthermore, the robustness of the proposed voltage control strategy is investigated under a series of parameters uncertainties, including the line parameters perturbation, load parameters variation, different disturbance locations, LC filters perturbation, output impedances perturbation and DG unit fault. The simulation and experimental results show that the proposed control approach is able to perform offset-free voltage control without any communication links and has a good capability to reject uncertain perturbations of islanded microgrids.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume30
Issue number7
Pages (from-to)3934 - 3951
Number of pages18
ISSN0885-8993
DOIs
Publication statusPublished - Jul 2015

Keywords

  • Distributed voltage-predictive control
  • Dynamic performance
  • Islanded microgrid
  • Robustness
  • Voltage estimator

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