Voltage unbalance improvement in low voltage residential feeders with rooftop PVs using custom power devices

Shahnia, Farhad, Ghosh, Arindam, Ledwich, Gerard, & Zare, Firuz (2014) Voltage unbalance improvement in low voltage residential feeders with rooftop PVs using custom power devices. International Journal of Electrical Power & Energy Systems, 55, pp. 362-377.

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Abstract

Voltage unbalance is a major power quality problem in low voltage residential feeders due to the random location and rating of single-phase rooftop photovoltaic cells (PV). In this paper, two different improvement methods based on the application of series (DVR) and parallel (DSTATCOM) custom power devices are investigated to improve the voltage unbalance problem in these feeders. First, based on the load flow analysis carried out in MATLAB, the effectiveness of these two custom power devices is studied vis-à-vis the voltage unbalance reduction in urban and semi-urban/rural feeders containing rooftop PVs. Their effectiveness is studied from the installation location and rating points of view. Later, a Monte Carlo based stochastic analysis is carried out to investigate their efficacy for different uncertainties of load and PV rating and location in the network. After the numerical analyses, a converter topology and control algorithm is proposed for the DSTATCOM and DVR for balancing the network voltage at their point of common coupling. A state feedback control, based on pole-shift technique, is developed to regulate the voltage in the output of the DSTATCOM and DVR converters such that the voltage balancing is achieved in the network. The dynamic feasibility of voltage unbalance and profile improvement in LV feeders, by the proposed structure and control algorithm for the DSTATCOM and DVR, is verified through detailed PSCAD/EMTDC simulations.

Impact and interest:

14 citations in Scopus
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13 citations in Web of Science®

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ID Code: 66603
Item Type: Journal Article
Refereed: Yes
Keywords: Low voltage feeder, Custom power device, DSTATCOM, DVR, Photovoltaic cells, Voltage unbalance
DOI: 10.1016/j.ijepes.2013.09.018
ISSN: 0142-0615
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier Ltd.
Deposited On: 23 Jan 2014 23:12
Last Modified: 28 Feb 2014 04:07

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