Distributed Control Strategy Based on a Consensus Algorithm and on the Conservative Power Theory for Imbalance and Harmonic Sharing in 4-Wire Microgrids

Claudio Burgos-Mellado, Jacqueline J. Llanos, Roberto Cardenas, Doris Saez, Daniel E. Olivares, Mark Sumner, Alessandro Costabeber

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

A distributed control system is proposed which uses the Conservative Power Theory (CPT) and a consensus algorithm to share imbalance and harmonics between different converters in three-phase four-wire droop-controlled Microgrids (MGs). The CPT is used to identify the balanced, unbalanced and distorted components of the currents and powers in the system. Control loops based on virtual impedance and implemented in the stationary a-b-c frame are then used to distribute these components between the various converters in the MG. The magnitudes of the virtual impedances are adaptively calculated using a novel consensus-based distributed control scheme with the aim of sharing imbalances and harmonics according to the residual VA capacity of each converter whilst regulating the imbalance and distortion at their output to meet the appropriate IEEE power quality standards. Extensive simulations show that the proposed distributed control has excellent performance, and experimental validation is provided using a laboratory-scale 4-wire MG.

Original languageEnglish
Article number8834868
Pages (from-to)1604-1619
Number of pages16
JournalIEEE Transactions on Smart Grid
Volume11
Issue number2
DOIs
StatePublished - Mar 2020
Externally publishedYes

Keywords

  • 4-wire microgrids
  • CPT
  • consensus algorithm
  • distributed control
  • harmonic sharing
  • imbalance sharing

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