A Study on Types of Measurements in Distribution System State Estimation

State estimation in active distribution networks is an integral part of the energy management center and is of great importance. With increasing complexity and real-time management of active distribution networks, knowing network information at any given time is one of the important criteria for controlling these types of networks. Regarding the economic issues, it is not reasonable to place the meters in each node from the distribution network. Therefore, the state estimation method is performed using a limited number of measurements to obtain complete information about the system conditions. The main part of state estimation is the information provided by the measurements. This paper investigates various types of measurements used in the estimation process of the balanced and unbalanced three-phase distribution networks and the characteristics of measurements, the relations corresponding to the measurement function and the Jacobian matrix elements are presented.