State Estimation in Unbalanced Three Phase Distribution Network through Accurate Modelling of Network Elements

State estimation in active distribution networks which is the heart of energy management central is of great importance. Considering the increase in complexity and realtime management of active distribution networks, knowing network information at each time instant is one of the important measures for exploitation, control and protection of these networks. In this paper, state estimation in unbalanced three phase networks is investigated. In order to obtain a high accuracy procedure which is close to reality, elements comprising distribution network should be modelled accurately. In this paper, different components including line, transformer, load and regulator are modelled. In addition, equations regarding real and virtual measurements used in state estimation of three-phase networks are given. Then, network component and measurement modelling in standard IEEE 13-bus network is implemented and simulated.