Dreiphasige Lastflußschätzung für Verteilungsnetze

A three-phase state estimation method for distribution systems is presented by means of normal equations or orthogonal transformation alternatively. Three phase models for lines and for two- and three-winding transformers are proposed. Some of these transformer models cause convergence problems due to ill conditioning of the gain matrix. Methods for overcoming these problems are discussed. The efficiency of the methods is demonstrated by means of a municipal distribution network.