
doi: 10.66800/0171
Conventional droop control for parallel Grid-Forming Inverters (GFMIs) relies on the assumption of highly inductive transmission lines to decouple active and reactive power. However, in low-voltage grids where transmission lines are predominantly resistive, this assumption fails, leading to power coupling, power-sharing inaccuracies, and system instability during load variations. This technical note presents the virtual impedance method to overcome these challenges. By digitally subtracting a calculated virtual voltage drop from the inverter's voltage reference, the control system mimics the behavior of an inductive line, effectively decoupling active and reactive power flows. The note provides a practical implementation of this strategy using MATLAB Simulink and the imperix ACG SDK, deployed on the TPI 8032 programmable inverter. Experimental results demonstrate that incorporating a well-tuned virtual inductance eliminates steady-state oscillations, restores system stability, and ensures accurate active power sharing between parallel GFMIs connected over resistive lines.
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