An Automated Impedance Estimation Method in Low-Voltage Distribution Network for Coordinated Voltage Regulation

Internode line impedance values are essential information for achieving coordinated voltage regulation with distributed energy devices. However, in a low-voltage distribution system, these values are difficult to acquire, especially when the devices are installed in an ad hoc manner by individual us...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2016-03, Vol.7 (2), p.1012-1020
Main Authors: Sekyung Han, Kodaira, Daisuke, Soohee Han, Bokyu Kwon, Hasegawa, Yasuo, Aki, Hirohisa
Format: Article
Language:English
Subjects:
Automation
Control
Current measurement
DER
Devices
Electric potential
Estimation
Impedance
impedance estimation
Mathematical models
Reactive power
Terminals
Topology
Voltage
Voltage control
Voltage measurement
voltage regulation
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Summary:Internode line impedance values are essential information for achieving coordinated voltage regulation with distributed energy devices. However, in a low-voltage distribution system, these values are difficult to acquire, especially when the devices are installed in an ad hoc manner by individual users. This paper proposes a novel method for automated impedance estimation based on practically available parameters at the terminal nodes. The distributed energy devices measure and transmit the terminal parameters to a host device. Then, the host device estimates the line impedances based on its impedance model and the collected parameters. For practical implementation, the proposed method is built under several assumptions. For example, it is assumed that the phases of terminal voltages are not synchronized owing to communication latency. Instead, only the magnitude value is incorporated during the impedance estimation. The proposed method is verified via a simulation that assumes a realistic environment.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2015.2489199