首页|An Improved Droop-Based Adaptive Virtual Impedance for Accurate Power Sharing Among Multiple DGs in Islanded Microgrid

An Improved Droop-Based Adaptive Virtual Impedance for Accurate Power Sharing Among Multiple DGs in Islanded Microgrid

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Accurate power sharing in islanded microgrids (MGs) is essential to preserve the system stability and deliver the required load power. However, the distinct ratings of feeders result in disparate voltage drops and, therefore, varying output voltages from distributed generators (DGs). This work proposes a distributed adaptive virtual complex impedance to achieve accurate power sharing among DG units with minimal control loops. The controller dynamically adjusts its parameters based on the system parameters, allowing it to adapt to various conditions. Unlike previous controllers, the proposed controller can operate effectively with multiple connected DGs in the system. The designed approach accounts for complex components of the feeders’ impedances, with actual ratios between the complex components to enhance the system performance and the point of common coupling (PCC) voltage. Based on that, the decoupling between the active and reactive power is achieved. The effectiveness of the proposed controller is validated through simulations involving both two and multiple DG units, and its performance is compared against conventional control methods. It demonstrated superior performance by achieving accurate reactive power sharing, reducing active power overshoot from 7.14% to 4%, and decreasing the voltage deviation at the PCC from −0.783% to −0.435%. Additionally, the controller effectively synchronized system currents and reduced circulating currents by 98%. These improvements were observed across various test scenarios. The first scenario is executed considering two DGs in the MG system, and the results are compared with those of conventional droop control and conventional virtual impedance. The second scenario involves statistically comparing the proposed controller with those in the literature, focusing on the percentage overshoot of the controller, response time, and PCC voltage level. The third scenario is conducted to demonstrate the proposed controller’s ability to be extended for multiple connected DGs in the MG system.

ResistanceImpedanceReactive powerInductanceTuningAccuracyPI controlMicrogridsVoltage controlEstimation

Ahmed M. Abouassy、Hamoud Alafnan、Diaa-Eldin A. Mansour、Abdullah Albaker、Tamer F. Megahed

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Department of Electrical Engineering, Benha Faculty of Engineering, Benha University, Benha, Egypt

Department of Electrical Engineering, College of Engineering, University of Ha’il, Ha’il, Saudi Arabia

Department of Electrical Power and Machines Engineering, Faculty of Engineering, Tanta University, Tanta, Egypt|Department of Electrical Power Engineering, Faculty of Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El Arab City, Alexandria, Egypt

Department of Electrical Power Engineering, Faculty of Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El Arab City, Alexandria, Egypt|Department of Electrical Engineering, Faculty of Engineering, Mansoura University, Mansoura, Egypt

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2025

10.1109/ACCESS.2025.3581481

IEEE Access

IEEE Access

ISSN：
年,卷(期)：2025.13(1)
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