Power sharing and voltage quality are challenging problems in islanded microgrids with nonlinear loads. Distributed generations (DGs) can be used to improve the power quality in microgrids. However, when several DGs are used for voltage harmonic compensation, the conventional droop control can cause poor harmonic power sharing among the DGs due to mismatched line impedance.
Kim Sung Hyok, a section head at the Faculty of Electrical Engineering, proposed a regulation method of virtual harmonic impedance for proportional harmonic power sharing. This method does not require the prior knowledge of line impedance.
The simulation results showed that the proposed method is effective for proportional sharing of harmonic power by reducing the total harmonic distortion (THD) of voltage at point of common coupling (PCC).
For more information, you can refer to his paper “Distributed Regulation of Virtual Impedance for Voltage Harmonic Compensation in Islanded Microgrids” in “Proceedings of KUTIC-2025”.