TY - GEN
T1 - An accurate reactive power sharing strategy for an islanded microgrid based on online feeder impedance estimation
AU - Mohammed, Nabil
AU - Ciobotaru, Mihai
PY - 2020
Y1 - 2020
N2 - The mismatched feeder impedances in islanded microgrids result in poor reactive power sharing when the conventional frequency and voltage droop control technique is deployed. Thus, adaptive/improved droop control schemes should be adopted. This paper proposes a novel reactive power sharing for resistive-inductive islanded microgrids. The proposed control scheme relies on the online estimation of feeder impedances to accurately and adaptively tune the virtual complex impedances of parallel-connected inverters. After the virtual impedance is tuned for a given operating point, it is required to be tuned again only if the microgrid load changes. This advantage makes the proposed control scheme tolerant of communication disruptions/delays. The proposed technique perfectly compensates the voltage drops across various feeder impedances in real-time. Consequently, it is ensured that load demands are taken up among parallel-connected inverters in proportion to their power ratings by only adopting the conventional droop control method and the proposed adaptive virtual complex impedance. Simulation results of an islanded microgrid consists of two parallel single-phase inverters are presented to validate the performance of the propose technique.
AB - The mismatched feeder impedances in islanded microgrids result in poor reactive power sharing when the conventional frequency and voltage droop control technique is deployed. Thus, adaptive/improved droop control schemes should be adopted. This paper proposes a novel reactive power sharing for resistive-inductive islanded microgrids. The proposed control scheme relies on the online estimation of feeder impedances to accurately and adaptively tune the virtual complex impedances of parallel-connected inverters. After the virtual impedance is tuned for a given operating point, it is required to be tuned again only if the microgrid load changes. This advantage makes the proposed control scheme tolerant of communication disruptions/delays. The proposed technique perfectly compensates the voltage drops across various feeder impedances in real-time. Consequently, it is ensured that load demands are taken up among parallel-connected inverters in proportion to their power ratings by only adopting the conventional droop control method and the proposed adaptive virtual complex impedance. Simulation results of an islanded microgrid consists of two parallel single-phase inverters are presented to validate the performance of the propose technique.
UR - http://www.scopus.com/inward/record.url?scp=85097741075&partnerID=8YFLogxK
U2 - 10.1109/IECON43393.2020.9255394
DO - 10.1109/IECON43393.2020.9255394
M3 - Conference proceeding contribution
AN - SCOPUS:85097741075
SN - 9781728154152
SP - 2525
EP - 2530
BT - Proceedings IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society
PB - Institute of Electrical and Electronics Engineers (IEEE)
CY - Piscataway, NJ
T2 - 46th Annual Conference of the IEEE Industrial Electronics Society, IECON 2020
Y2 - 19 October 2020 through 21 October 2020
ER -