1. Coordinated reactive power control for static synchronous compensators under unbalanced voltage sags
- Author
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Luis Garcia de Vicuna, Miguel Castilla, Jose Matas, Jaume Miret, Eduardo Alarcon-Gallo, Antonio Camacho, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, and Universitat Politècnica de Catalunya. SEPIC - Sistemes Electrònics de Potència i de Control
- Subjects
Energies::Energia elèctrica::Automatització i control de l'energia elèctrica [Àrees temàtiques de la UPC] ,Engineering ,Switched-mode power supply ,business.industry ,Reactive power ,Voltage sag ,Voltage support ,Static VAR compensator ,Power factor ,AC power ,Voltage optimisation ,Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric [Àrees temàtiques de la UPC] ,Static synchronous compensator ,Control theory ,Electronic engineering ,Energia elèctrica -- Distribució ,Sistemes de distribució d'energia elèctrica -- Control ,Voltage regulation ,Voltage regulators ,Sistemes de distribució d'energia elèctrica -- Estabilitat ,Volt-ampere reactive ,business ,Capacitors, Synchronous - Abstract
Unbalanced voltage sags strongly deteriorate the performance of power converters and electrical machines connected to the distribution network. In particular, a reduction of the power quality is noticed in these equipments, which is caused by a ripple in the output power and an increase of the current harmonic distortion. Several solutions based on reactive power compensation have been introduced to cope with this problem. Among them, static synchronous compensators have confirmed the superior performance due to the possibility of using all rated power exclusively to voltage support. This paper presents a simple reactive power control algorithm for static synchronous compensators operating under unbalanced voltage sags. The main feature of the proposed algorithm is that it allows a fine adjustment of the amount of reactive power injected by the positive- and negative-sequence components. Thus the control algorithm provides voltage support at the output of the static synchronous compensator. Specifically the proposed control conveniently corrects both the positive- and negative-sequence voltage. Selected simulation results are provided to validate the proposal.
- Published
- 2012
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