Low voltage system state estimation using smart meters

Abstract

Accurate and reliable state estimation for low voltage networks is the core stone for flexible operation and control in the current transaction from passive conventional to active smart grids. The development in the energy supply has revealed a rapid increase of controllable distributed generators, consumer's installation, stationary storage systems and electric vehicles. This development leads to a significantly different kind of system behavior which must be understood first, and then to make suggestions for operational network improvements in order to increase the security and efficiency of the distribution system operation. For this, a high chronological and topological resolution of information for the system state estimation in the low voltage level is necessary. However, measurement data are necessary for state estimation, these measurements can be obtained either from the distribution system measurement infrastructure or from the smart meters at the connection points of the customer. The focus of this paper is to obtain the technical feasibility of using smart meter and their measurements for low voltage network observability and controllability through state estimation techniques. Also to analyse the impact of high accuracy measurement data provided from smart meters on the state estimation output accuracy for both voltage and it's phase angle.