Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Droop Control for Parallel Inverers in Islanded Microgrid Considering Unbalanced Low-Voltage Line Impedances
Authors Kyung-Bae Lim ; Jaeho Choi
DOI 10.6113/TKPE/2013.18.4.387
Page pp.387-396
ISSN 1229-2214
Keywords droop control; parallel inverters; microgrid; load sharing; distributed generation; islanded mode; virtual inductor
Abstract This paper investigates the droop control of parallel inverters for an islanded mode of microgrid. Frequency and voltage droop control is one of power control and load demand sharing methods. However, although the active power is properly shared, the reactive power sharing is inaccurate with conventional method due to the unequal line impedances and the power coupling of active - reactive power. In order to solve this problem, an improved droop method with virtual inductor concept and a voltage and current controller properly designed have been considered and analyzed through the PSiM simulation. The performance of improved droop method is analyzed in not only low-voltage line but also medium voltage line.