Technical Lecture Session
Power electronics, Low voltage microgrid, Droop control, Virtual impedance
This article proposes a virtual impedance loop to shape the output voltage in microgrids for line voltage regulation for maintaining power quality. A virtual impedance extracting and shaping filter is proposed to extract and weigh selected frequency components of the line current for achieving harmonic current sharing and reducing total harmonic distortion in presence of non-linear loads. An isochronous voltage-active power droop architecture is employed to achieve power sharing and to limit circulating currents. Analytical results on designing virtual impedances and their dependence on network line parameters are obtained. Simulations are performed to validate the proposed method.