PV-Installable Capacity in Medium-Voltage and Low-Voltage Distribution Networks with Optimal Line-Drop Compensation Parameters
Publication: Journal of Energy Engineering
Volume 143, Issue 3
Abstract
To reduce greenhouse gases, the high penetration of photovoltaic (PV) generation has been greatly anticipated in Japan. However, local distribution networks face voltage-rise problems when numerous PV systems are connected. In particular, rooftop-type PVs on detached houses can be widely installed in Japan. In that case, the voltage rise in low-voltage wires or service wires is significant because of the high resistance of these wires. In terms of network operators, spatial distribution scenarios for PV installation cannot be prespecified because each PV installation is determined by the particular customer. This paper evaluates PV-installable capacity from a systematic perspective under voltage constraints in medium- and low-voltage networks with a consideration of voltage control equipment [under-load tap changer (ULTC) and step voltage regulator (SVR)]. Through the use of optimal parameters for ULTC and SVR, PV-installable capacity can be improved. In particular, PV-installable capacity around the end of a feeder can be significantly increased by installing a SVR. In addition, this paper analyzes the effect of load sharing of pole transformers for reducing voltage rise in terms of PV-installable capacity to compare with an installation of a SVR. Through numerical simulations, the SVR is shown to be more advantageous than the load sharing of pole transformers for increasing PV-installable capacity.
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Acknowledgments
This work was supported in part by the Japanese Society for the Promotion of Science under Grant-in-Aid for Scientific Research (No. 25420922). This work was also supported by CREST, JST.
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Published In
Journal of Energy Engineering
Volume 143 • Issue 3 • June 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 10, 2015
Accepted: Jan 27, 2016
Published online: Apr 6, 2016
Discussion open until: Sep 6, 2016
Published in print: Jun 1, 2017
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