Title: Frequency and voltage support for GFLI connected to weak grid using current compensation based on virtual inductance

Authors: A.U. Lawan; Inuwa Barau Inuwa; Ahmed Shehu Timta

Addresses: Department of Electrical Engineering, Bayero University, Kano, Nigeria ' Department of Electrical Engineering, Bayero University, Kano, Nigeria ' Department of Electrical Engineering, Bayero University, Kano, Nigeria

Abstract: Grid following inverters (GFLIs) are one of the devices required to generate electrical power from the IBR. GFLI system mostly used conventional proportional integral vector current control to an energised grid based on the required grid code. However, when connected to weak grid, the conventional control fails to adapt to grid variations, which leads to poor filtering and control of the ripples in the DC, which leads to instability and cascading effect of other control loops signals. To mitigate the effects and enhanced the adaptability of the GFLI under weak grid, the work proposes a simple and cost-effective technique of compensation current based on virtual inductance which provide frequency and voltage support to the system. Simulation and stability analysis using MATLAB/Simulink shows that the GFLI adapt the grid variations, thus it becomes stable even under weak grid without addition of extra hardware for compensation and variation mitigation.

Keywords: IBR; grid following inverter; GFLI; weak grid; grid variation; virtual inductance; compensation currents.

DOI: 10.1504/IJPEC.2026.152962

International Journal of Power and Energy Conversion, 2026 Vol.17 No.2, pp.173 - 191

Received: 26 Feb 2024
Accepted: 20 Jun 2024
Published online: 17 Apr 2026 *

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