A Two-layer Control Scheme Based on P-V Droop Characteristic for Accurate Power Sharing and Voltage Regulation in DC Microgrids

Mehdi Baharizadeh, Mohammad S. Golsorkhi, Mahdi Shahparasti*, Mehdi Savaghebi

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The increasing penetration of dc distributed energy resources (DERs) and dc loads has motivated the utilization of dc microgrids (MGs). In this paper, a new two-level control scheme is proposed for accurate power sharing and appropriate voltage regulation in dc MGs during islanded operation mode. In the primary control level, a P-\dot V droop method is proposed to eliminate the dependency of power sharing among DERs on line resistances. Since the P V droop deviates the voltage derivative to a nonzero value, a voltage derivative restoration mechanism is adopted in the secondary control level to provide voltage stability. The secondary control level also compensates the voltage deviations by cascading an outer voltage control loop with the inner voltage derivative restoration loop. The secondary control signal is broadcasted to each DER via a unidirectional low-bandwidth communication link. Small signal stability of the proposed scheme is analyzed by studying the locus of the system eigenvalues. To verify the efficacy of the proposed method and compare it with the conventional scheme, real-time simulations in OPAL-RT lab setup are provided.

Original languageEnglish
JournalIEEE Transactions on Smart Grid
Volume12
Issue number4
Pages (from-to)2776-2787
ISSN1949-3053
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Bandwidth
  • Bidirectional control
  • DC microgrids
  • Distributed energy resources
  • Microgrids
  • power management
  • Power system stability
  • Reactive power
  • Topology
  • Voltage control
  • voltage regulation.
  • voltage regulation

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