Stability analysis and experimental evaluation of a control strategy for islanded operation of distributed generation units

Behrooz Bahrani, Houshang Karimi, Reza Iravani

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This paper presents stability analysis of a distributed generation (DG) controller (1), in an islanded mode, based on the Mapping Theorem and the Zero Exclusion Condition, and validates the results based on a laboratory scale experimental setup. The DG unit is interfaced to the host system through a voltage-sourced converter (VSC). The control strategy regulates the load voltage at the desired value in the islanded mode, despite uncertainties in the load parameters. The frequency of the island is controlled in an open loop manner by an internal oscillator. The experimental results show that the controller provides robust voltage control for a wide range of load parameters, and even maintains the voltage within the prescribed range during the start-up transients of a motor which is part of the island load.

Original languageEnglish
Pages (from-to)1013-1022
Number of pages10
JournalIEEJ Transactions on Industry Applications
Issue number8
Publication statusPublished - 2011
Externally publishedYes


  • Autonomous operation
  • Distributed generation (DG)
  • Islanding operation
  • Robust control
  • Stability analysis
  • Uncertainty

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