Consensus-Based Droop Control Synthesis for Multiple DICs in Isolated Micro-Grids

Lin Yu Lu, Chia Chi Chu

Research output: Contribution to journalJournal Article peer-review

144 Scopus citations

Abstract

The task of autonomous power sharing in a micro-grid is usually achieved by decentralized droop control on individual interface power converters, which may suffer from the dependence on output line impedances. Inaccurate reactive power sharing will occur under strongly non-uniform line impedances. Due to inherently distributed and heterogeneous nature of the micro-grid, it becomes an ideal platform for applications of consensus control algorithms. In this paper, the consensus-based droop control with sparse communication network is proposed to overcome the drawback of existing droop control methods. In particular, when line impedances of the power grid are either lossy with the uniform R/X ratio or even pure resistive, the consensus droop control is still an effective method for autonomous real and reactive power sharing. In addition, closed-loop system stability of the proposed consensus-based droop control method can be ensured by the energy function approach under certain conditions. Real-time simulations of two micro-grid systems are studied to validate the feasibility of the proposed consensus-based droop control method.

Original languageEnglish
Article number6967870
Pages (from-to)2243-2256
Number of pages14
JournalIEEE Transactions on Power Systems
Volume30
Issue number5
DOIs
StatePublished - 01 09 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1969-2012 IEEE.

Keywords

  • Consensus algorithm
  • droop control
  • energy functions
  • micro-grid
  • real-time simulations

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