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.


PI controller, decentralized control, droop control, virtual impedance


Download data is not yet available.


T. Adefarati and R. C. Bansal, "Reliability, economic and environmental analysis of a microgrid system in the presence of renewable energy resources," Applied Energy, vol. 236, pp. 1089-1114, Feb. 2019.

M. Allison and G. Pillai, "Planning the Future Electricity Mix for Countries in the Global South: Renewable Energy Potentials and Designing the Use of Artificial Neural Networks to Investigate Their Use Cases," Designs, vol. 4, no. 3, Sep. 2020, Art. no. 20.

M. H. Rehmani, M. Reisslein, A. Rachedi, M. Erol-Kantarci, and M. Radenkovic, "Integrating Renewable Energy Resources Into the Smart Grid: Recent Developments in Information and Communication Technologies," IEEE Transactions on Industrial Informatics, vol. 14, no. 7, pp. 2814-2825, Jul. 2018.

J. Zhang, J. Ning, L. Huang, H. Wang, and J. Shu, "Adaptive droop control for accurate power sharing in islanded microgrid using virtual impedance," in IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, Beijing, China, Oct. 2017, pp. 2383-2388.

C. Hao, L. Hengyu, L. Xuchen, W. Defu, G. Tie, and W. Wei, "Parallel Inverter Circulating Current Suppression Method Based on Adaptive Virtual Impedance," in 2019 4th International Conference on Power and Renewable Energy (ICPRE), Chengdu, China, Sep. 2019, pp. 162-166.

M. Zhang, B. Song, and J. Wang, "Circulating Current Control Strategy Based on Equivalent Feeder for Parallel Inverters in Islanded Microgrid," IEEE Transactions on Power Systems, vol. 34, no. 1, pp. 595-605, Jan. 2019.

M. H. Khan, S. A. Zulkifli, E. Pathan, E. Garba, R. Jackson, and H. Arshad, "Decentralize power sharing control strategy in islanded microgridsDecentralize power sharing control strategy in islanded microgrids," Indonesian Journal of Electrical Engineering and Computer Science, vol. 20, no. 2, pp. 752-760, Nov. 2020.

D. Li and J. Li, "Improved current-based droop control strategy for microgrids inverter," in 2020 39th Chinese Control Conference (CCC), Shenyang, China, Jul. 2020, pp. 3654-3658.

E. Pathan, A. A. Bakar, S. A. Zulkifi, M. H. Khan, H. Arshad, and M. Asad, "A Robust Frequency Controller based on Linear Matrix Inequality for a Parallel Islanded Microgrid," Engineering, Technology & Applied Science Research, vol. 10, no. 5, pp. 6264-6269, Oct. 2020.

E. Pathan, S. A. Zulkifli, U. B. Tayab, and R. Jackson, "Small Signal Modeling of Inverter-based Grid-Connected Microgrid to Determine the Zero-Pole Drift Control with Dynamic Power Sharing Controller," Engineering, Technology & Applied Science Research, vol. 9, no. 1, pp. 3790-3795, Feb. 2019.

X. Ding, R. Yao, X. Zhai, C. Li, and H. Dong, "An adaptive compensation droop control strategy for reactive power sharing in islanded microgrid," Electrical Engineering, vol. 102, no. 1, pp. 267-278, Mar. 2020.

A. U. Krismanto, N. Mithulananthan, and O. Krause, "Stability of Renewable Energy based Microgrid in Autonomous Operation," Sustainable Energy, Grids and Networks, vol. 13, pp. 134-147, Mar. 2018.

J. Chen, D. Yue, C. Dou, L. Chen, S. Weng, and Y. Li, "A Virtual Complex Impedance Based P-V Droop Method for Parallel-Connected Inverters in Low-Voltage AC Microgrids," IEEE Transactions on Industrial Informatics, vol. 17, no. 3, pp. 1763-1773, Mar. 2021.

A. S. Alsafran and M. W. Daniels, "Consensus Control for Reactive Power Sharing Using an Adaptive Virtual Impedance Approach," Energies, vol. 13, no. 8, Jan. 2020, Art. no. 2026.


How to Cite

E. Pathan, “Virtual Impedance-based Decentralized Power Sharing Control of an Islanded AC Microgrid”, Eng. Technol. Appl. Sci. Res., vol. 11, no. 1, pp. 6620–6625, Feb. 2021.


Abstract Views: 657
PDF Downloads: 520

Metrics Information

Most read articles by the same author(s)