Temperature Dependent Branch Current Based Active Distribution System State Estimation

Abstract This paper proposed a state estimation method for an active distribution system that includes conductor temperature as a state variable. It is well known that the feeder parameters of a distribution system are sensitive to temperature variations, line loading and line losses. So the tempera...
Ausführliche Beschreibung

Abstract This paper proposed a state estimation method for an active distribution system that includes conductor temperature as a state variable. It is well known that the feeder parameters of a distribution system are sensitive to temperature variations, line loading and line losses. So the temperature variation effect on state estimation performance is highly significant that most authors have not considered in the case of the distribution system. The proposed approach of state estimation has incorporated the temperature uncertainty effect on state estimation accuracy. The conductor parameters such as resistances and reactances are changing due to uncertain variations of conductor temperature. To study the temperature effect, the state vector includes branch current magnitudes and angles of all the lines and conductor temperature as an extra state variable for accurate monitoring and control of the distribution systems. The performance of the proposed temperature-dependent state estimation technique has been tested on the IEEE-69 bus system under different operating scenarios and metrological characteristics of measuring devices for validation of the proposed work. The proposed state estimator performance is also investigated in the presence of distribution generation (DGs). The results obtained using the proposed state estimation techniques have been compared with the conventional state estimation methods for validation of the simulation results. Ausführliche Beschreibung