Secondary control with reduced communication requirements for accurate reactive power sharing in AC microgrids

Mehdi Baharizadeh*, Mohammad Sadegh Golsorkhi, Mehdi Savaghebi

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

A secondary control method is proposed for accurate reactive power sharing as well as frequency and voltage restoration in islanded AC microgrids (MGs). The proposed method consists of an MG secondary controller, local secondary controllers for distributed energy resources (DERs), and a low-bandwidth communication link for broadcasting common data from the MG secondary controller to DERs. The broadcasted data includes the MG point of common coupling voltage magnitude and a common vertical shift for frequency and voltage restoration. Local secondary controllers calculate specific shifts for the Q-V droop characteristic of each dispatchable DER and the V-Q reverse droop characteristic of each photovoltaic (PV) system, aligning their operating points with the Q-VPCC and VPCC-Q droop characteristics, respectively. By employing VPCC as a common global variable, coordination of reactive power generation of all dispatchable DERs and PV systems is achieved, enabling accurate reactive power sharing. Importantly, in the proposed scheme, the required communication bandwidth and the communication burden are minor and are not increased with the number of DERs. Additionally, the DERs are relieved of the need for data transmission capability. The small signal stability of the proposed method is examined and its effectiveness is validated through Hardware-in-the-Loop (HIL) experimental results.
Original languageEnglish
JournalIET Smart Grid
Volume6
Issue number6
Pages (from-to)638-652
Number of pages15
ISSN2515-2947
DOIs
Publication statusPublished - 2023

Keywords

  • And peer-to-peer energy trading
  • Distributed power generation
  • Hierarchical systems
  • Invertors
  • Microgrid
  • Nanogrid
  • Photovoltaic power systems

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