Title :
A UPFC with reduced DC bus capacitance for LV distribution networks with high PV penetrations
Author_Institution :
Centre for Smart Grids & Sustainable Power Syst., Curtin Univ., Perth, WA, Australia
Abstract :
A low voltage (LV) distribution level unified power flow controller (UPFC) is shown capable of regulating the positive sequence voltage with a network while simultaneously correcting phase unbalance voltages that can be produced by high levels of distributed photovoltaic (PV) generation. Instantaneous reactive power theory shows that DC-bus capacitor power will fluctuate at twice mains frequency during any unbalanced operation. Instantaneous power balance can be maintained by allowing the input converter to draw a small negative sequence current. This allows a hundred-fold reduction in the value of the DC bus capacitance allowing long life ceramic or polypropylene capacitors to replace electrolytic capacitors in this application.
Keywords :
ceramic capacitors; distributed power generation; distribution networks; electrolytic capacitors; load flow control; photovoltaic power systems; power capacitors; power convertors; power generation control; reactive power control; DC bus capacitance reduction; LV distribution networks; PV generation; UPFC; ceramic capacitors; distributed photovoltaic generation; electrolytic capacitors; high PV penetration; input converter; low voltage distribution level unified power flow controller; phase unbalance voltage correction; polypropylene capacitors; positive sequence voltage; reactive power theory; Capacitors; Ceramics; Inverters; Load flow; Power control; Regulators; Voltage control; UPFC; distributed generation; instantaneous power theory; photovoltaic; power quality; reduced bus capacitance;
Conference_Titel :
Universities Power Engineering Conference (AUPEC), 2012 22nd Australasian
Conference_Location :
Bali
Print_ISBN :
978-1-4673-2933-0
