Distribution Grid Admittance Estimation with Limited Non-Synchronized Measurements

In this paper we propose a method for estimating radial distribution grid admittance matrix using a limited number of measurement devices. Neither synchronized three-phase measurements nor phasor measurements are required. After making several practical assumptions, the method estimates even impedances of lines which have no local measurement devices installed. The computational complexity of the proposed method is low, and this makes it possible to use for on-line applications. Effectiveness of the proposed method is tested using data from a real-world distribution grid in Vienna, Austria.