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

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Open access
Authors
Wolfs, Peter
Date
2012
Type
Conference Paper

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Wolfs, P. 2012. A UPFC with reduced DC bus capacitance for LV distribution networks with high PV penetrations, in 22nd Australasian Universities Power Engineering Conference 2012 (AUPEC), Sep 26-29 2012. Bali, Indonesia: IEEE.
Source Title
Proceedings of the 22nd Australasian Universities Power Engineering Conference
Source Conference
22nd Australasian Universities Power Engineering Conference
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Department of Electrical and Computer Engineering
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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.