Um estimador de estado de redes de distribuição de energia elétrica baseado em simulated annealing.

Abstract

Estimation of bus voltages and power losses in primary distribution feeders are important for system planning and operation. However, the number of measurements that are available to do that is very small. Usually, there are just measurements in the substation exit and in buses where special consumers are connected. The nominal MVA of the transformers installed in all the other buses is the only information that one had. In this work, a state estimation method for distribution feeders is proposed. So, approximated value of voltage buses and the total technical losses can be determined. For that, it takes place an adjustment of the common loads by estimating of power factor and utilization factors. For each point of available measurement (P, Q, V and I), power factor and utilization factor are calculated to be attributed to the loads installed after that point. A simulated annealing algorithm is used to calculate both power factors and utilization factors. The available measures and the values of nominal power of the distribution transformers are the only required data. The method was applied to the IEEE 13, 34, 37 and 123 buses test feeders and the validation is made starting from the comparison of the values obtained with the known values of the results of these feeders.