Seamless Transition between Islanded and Grid Connected Three-Phase VSI-based Microgrids

  • M. H. Khan Department of Electrical Power Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia
  • E. Pathan Department of Electrical Power Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia
  • M. Asad Saudi Electricity Company, Saudi Arabia
  • M. A. Sadiq Department of Electrical Engineering, Faculty of Engineering & Technology, University of Poonch Rawalakot, Pakistan
  • A. A. Qureshi Trafigura Nyrstar, Australia
  • M. Shahid Siemens Ltd, Saudi Arabia
  • A. K. Pathan Power and Distribution Department, Larsen and Toubro Saudi Arabia LLC, Saudi Arabia
  • N. I. Shaikh Construction Manager, Larsen and Toubro Saudi Arabia LLC, Saudi Arabia

Abstract

Microgrids (MGs) are the emergent solution to overcome the current electricity demand. The MGs provide the facility to operate in both isolated and grid-connected modes. For both operating modes, Distributed Generation (DG) inverters are operating under grid forming or grid following control modes. During mode switching, the MG experiences enormous fluctuations, which occur due to the unidirectional islanding event. This paper presents a control strategy by using the modified power control scheme, current controller, and DC linked voltage controller scheme to ensure the operational mode transfer smoothly from the grid-connected to the islanded mode and vice versa. The proposed control scheme is applied to a three-phase distributed energy resource-based MG system with fixed loads. The simulation results validate the effectiveness of the control technique while tested at the point of common coupling and also at the time of mode transfer.

Keywords: grid forming, grid following, seamless transition, droop control

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