Virtual Impedance-based Decentralized Power Sharing Control of an Islanded AC Microgrid

  • E. Pathan Department of Electrical Power Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia
  • M. H. Khan Department of Electrical Power Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia
  • H. Arshad Department of Electrical Power Engineering, Universiti Tun Hussein Onn Malaysia, Malaysia
  • M. K. Aslam Electrical Engineering Department, COMSATS University, Pakistan
  • D. Jahangir Electrical Engineering Department, NUCES University, Pakistan
  • M. Asad Saudi Electricity Company, Saudi Arabia
  • M. I. Rabani Department of Electrical Contracting & Maintenance, XERVON, Saudi Arabia
Volume: 11 | Issue: 1 | Pages: 6620-6625 | February 2021 |


The future of power systems depends on the microgrid (MG) which includes distribution generators utilizing Renewable Energy Resources (RERs) and storage facilities. Decentralized control techniques are more reliable and stable in comparison with centralized controlled techniques. In this paper, a decentralized control strategy is presented for an islanded AC MG system. The control strategy includes improved droop control and virtual impedance. Control strategy with PI controllers to control the voltage and current is implemented to two Voltage Source Inverter (VSI) distribution generation units connected in parallel through a Point of Common Coupling (PCC). Circulating current and power-sharing deviations caused by the mismatched line impedance were taken into account. The proposed control scheme was tested in MATLAB/Simulink. Power-sharing accuracy and circulating current suppression were obtained by implementing the proposed virtual impedance-based decentralized control strategy.

Keywords: PI controller, decentralized control, droop control, virtual impedance


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