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Related Experiment Video

Updated: Jan 13, 2026

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Bumpless transfer for distributed generation units with mode-dependent controllers.

Pablo E Muñoz1, Ricardo J Mantz2, Sergio A González1

  • 1GECEP, Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales (LEICI), UNLP, CONICET, Asoc. CICpBA, C.C. 91 (1900), La Plata, Buenos Aires, Argentina.

ISA Transactions
|January 9, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a bumpless transfer scheme for distributed generation units (DGUs) in microgrids. The method ensures smooth transitions between grid-connected and island modes, preventing power transients and enhancing stability.

Keywords:
Bumpless transferMicrogridsReference conditioningSliding-mode control

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Area of Science:

  • Electrical Engineering
  • Power Systems
  • Control Theory

Background:

  • Distributed generation units (DGUs) in microgrids typically use current source control when grid-connected.
  • Transitioning to island mode requires some DGUs to switch to voltage source control.
  • This control switching can cause power transients, voltage/frequency instability, and system disruption.

Purpose of the Study:

  • To propose a novel bumpless transfer scheme for DGUs in microgrids.
  • To ensure smooth transitions between grid-connected and island modes.
  • To mitigate transients and maintain stability during mode switching.

Main Methods:

  • Implementation of a bumpless-transfer scheme using sliding-mode reference conditioning.
  • Guaranteeing the establishment of a sliding regime for DGU controllers.
  • Minimizing controller output mismatch during mode switching.

Main Results:

  • The proposed scheme effectively eliminates mismatches between DGU controller outputs during mode switching.
  • Unwanted transients in control action and DGU power output are avoided.
  • Robust performance was demonstrated for both islanding and reconnection events.

Conclusions:

  • The sliding-mode reference conditioning provides a robust solution for bumpless transfer in microgrids.
  • This method significantly improves the stability and reliability of microgrids during operational mode changes.
  • The approach ensures seamless transitions, regardless of the switching timing.