On Identification of Distribution Grids
Large-scale integration of distributed energy resources into distribution feeders necessitates careful control of their operation through power flow analysis. While the knowledge of the distribution system model is crucial for this analysis, it is often unavailable or outdated. The recent introduction of synchrophasor technology in low-voltage distribution grids has created ample opportunity to learn this model from high-precision, time-synchronized measurements of voltage and current phasors at various locations. This paper focuses on joint estimation of admittance parameters and topology of a polyphase distribution network from the available telemetry data via the lasso, a method for regression shrinkage and selection. We propose tractable convex programs capable of tackling the low-rank structure of the distribution system and develop an online algorithm for early detection and localization of critical events that induce a change in the admittance matrix. The efficacy of these techniques is corroborated through power flow studies on four three-phase radial distribution systems serving real and synthetic household demands.
© 2019 IEEE. Manuscript received February 22, 2018; revised October 31, 2018; accepted December 5, 2018. Date of publication January 4, 2019; date of current version September 17, 2019. This work was supported in part by the National Natural Science Foundation of China (NNSFC Grant No. 91748112) and in part by the Natural Science and Engineering Research Council of Canada (NSERC).
Submitted - 1711.01526.pdf