Low-Voltage Ride-Through Operation of Power Converters in Grid-Interactive Microgrids by Using Negative-Sequence Droop Control

Xin Zhao, Josep M. Guerrero, Mehdi Savaghebi, Juan Carlos Vasquez Quintero, Xiaohua Wu, Kai Sun

Research output: Contribution to journalJournal articleResearchpeer-review

42 Citations (Scopus)
800 Downloads (Pure)

Abstract

Due to the increasing penetration level of microgrids (MGs), it becomes a critical issue for MGs to help sustaining power system stability. Therefore, ancillary services, such as the low-voltage ride-through (LVRT) capability should be incorporated in MGs in order to guarantee stable operation of the utility grid during grid faults. In this paper, a LVRT control strategy based on positive/negative sequence droop control is proposed for grid-interactive MGs to ride-through voltage sags with not only inductive/resistive, but also complex line impedance. By using the proposed control strategy, MGs can support the grid voltage, make profits, and also ride-through the voltage dip during the whole fault period. A two layer hierarchical control strategy is proposed in this paper. The primary controller consists of voltage and current inner loops, a conventional droop control
and a virtual impedance loop, while the secondary controller is based on a positive/negative sequence droop scheme which is able to coordinate the power injection during voltage sags. Experimental results are obtained to verify the effectiveness of the proposed control strategy.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume32
Issue number4
Pages (from-to)3128 - 3142
Number of pages15
ISSN0885-8993
DOIs
Publication statusPublished - Apr 2017

Keywords

  • Grid-interactive microgrid
  • Negative sequence droop control
  • Low-voltage ride-through
  • Hierarchical control

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