Off-line tracking of series parameters in distribution systems using AMI data

Journal Article · Sun May 01 00:00:00 EDT 2016 · Electric Power Systems Research

DOI:https://doi.org/10.1016/j.epsr.2015.12.036· OSTI ID:1253869

Williams, Tess L.; Sun, Yannan; Schneider, Kevin

Electric distribution systems have historically lacked measurement points, and equipment is often operated to its failure point, resulting in customer outages. The widespread deployment of sensors at the distribution level is enabling observability. This paper presents an off-line parameter value tracking procedure that takes advantage of the increasing number of measurement devices being deployed at the distribution level to estimate changes in series impedance parameter values over time. The tracking of parameter values enables non-diurnal and non-seasonal change to be flagged for investigation. The presented method uses an unbalanced Distribution System State Estimation (DSSE) and a measurement residual-based parameter estimation procedure. Measurement residuals from multiple measurement snapshots are combined in order to increase the effective local redundancy and improve the robustness of the calculations in the presence of measurement noise. Data from devices on the primary distribution system and from customer meters, via an AMI system, form the input data set. Results of simulations on the IEEE 13-Node Test Feeder are presented to illustrate the proposed approach applied to changes in series impedance parameters. A 5% change in series resistance elements can be detected in the presence of 2% measurement error when combining less than 1 day of measurement snapshots into a single estimate.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1253869
• Report Number(s): PNNL-SA-110004; TE1201000
• Journal Information: Electric Power Systems Research, Vol. 134; ISSN 0378-7796
• Publisher: Elsevier
• Country of Publication: United States
• Language: English