Conductance-frequency droop control to ensure transient stability of inverter-based stand-alone microgrids
Fecha
2023Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Identificador del proyecto
Impacto
|
10.1016/j.ijepes.2022.108562
Resumen
Currently, inverter-based stand-alone microgrids are gaining interest due to the advantages of obtaining energy
from renewable sources. To manage the operation, these microgrids include storage systems connected in par-
allel to the PCC through electronic inverters that are controlled as voltage sources in order to support the fre-
quency and voltage at the PCC. For the purpose of ensuring P a ...
[++]
Currently, inverter-based stand-alone microgrids are gaining interest due to the advantages of obtaining energy
from renewable sources. To manage the operation, these microgrids include storage systems connected in par-
allel to the PCC through electronic inverters that are controlled as voltage sources in order to support the fre-
quency and voltage at the PCC. For the purpose of ensuring P and Q sharing among inverters and also the
synchronization stability of the microgrid, droop control is widely used, achieving a satisfactory performance in
normal operation. Nevertheless, in the presence of overloads or short-circuits, the inverters must limit the current
for self-protection, thereby modifying the performance of the system that then becomes prone to suffer transient
stability problems. In this paper, first the performance of the inverter-based stand-alone microgrids with the
conventional P-f and Iact-f droops is analyzed, obtaining the stability boundaries during current limitation. In
order to always ensure the synchronization stability of the system, this paper then proposes the G-f droop that
consists in employing the equivalent conductance seen by each inverter for its frequency droop control.
Furthermore, as this variable always correctly represents the inverter power angle, the system dynamics are not
affected by the operating conditions. The theoretical results have been validated by means of simulation and
Hardware-In-the-Loop results, showing the superior performance of the proposed G-f droop [--]
Materias
Inverter-based microgrids,
Droop control,
Current limitation,
Overloads,
Short-circuits
Editor
Elsevier
Publicado en
International Journal of Electrical Power & Energy Systems 144 (2023) 108562
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica, Electrónica y de Comunicación /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza Saila
Versión del editor
Entidades Financiadoras
This work has been supported by the Spanish State Research Agency (AEI) under grant PID2019-110956RB-I00/AEI/ 10.13039/501100011033, and by the
Public University of Navarre through a PhD scholarship. Open access funding provided by Public University of Navarre.