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A UPFC with reduced DC bus capacitance for LV distribution networks with high PV penetrations

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1 Author(s)
Wolfs, P. ; Centre for Smart Grids & Sustainable Power Syst., Curtin Univ., Perth, WA, Australia

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.

Published in:

Universities Power Engineering Conference (AUPEC), 2012 22nd Australasian

Date of Conference:

26-29 Sept. 2012