Title:
|
Flexible voltage support control for three-phase distributed generation inverters under grid fault
|
Author:
|
Camacho Santiago, Antonio; Castilla Fernández, Miguel; Miret Tomàs, Jaume; Vasquez, Juan C.; Alarcón Gallo, Eduardo
|
Other authors:
|
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. SEPIC - Sistemes Electrònics de Potència i de Control |
Abstract:
|
Ancillary services for distributed generation (DG)systems become a challenging issue to smartly integrate renewable-energy sources into the grid. Voltage control is one of these ancillary services which can ride through and support the voltage under grid faults. Grid codes fromthe transmission system operators describe the behavior of the energy source, regulating voltage limits and reactive power injection to remain connected and support the grid under fault. On the basis that different kinds of voltage sags require different voltage support strategies, a flexible control scheme for three-phase grid-connected inverters is proposed.
In three-phase balanced voltage sags, the inverter should inject reactive power in order to raise the voltage in all phases. In
one- or two-phase faults, the main concern of the DG inverter is to equalize voltages by reducing the negative symmetric sequence
and clear the phase jump. Due to system limitations, a balance between these two extreme policies is mandatory. Thus, over- and undervoltage can be avoided, and the proposed control scheme prevents disconnection while achieving the desired voltage support service. The main contribution of this work is the introduction of a control algorithm for reference current generation that provides
flexible voltage support under grid faults. Two different voltage sags have been experimentally tested to illustrate the behavior of the proposed voltage support control scheme. |
Subject(s):
|
-Àrees temàtiques de la UPC::Enginyeria electrònica -Àrees temàtiques de la UPC::Energies::Energia elèctrica -Distributed generation of electric power. -Reactive power control -voltage ride through -voltage sag -voltage support -Energia elèctrica -- Distribució -Energia elèctrica -- Generació distribuïda -Generadors |
Rights:
|
|
Document type:
|
Article - Published version Article |
Published by:
|
Institute of Electrical and Electronics Engineers (IEEE)
|
Share:
|
|