Voltage quality control at distribution systems applying a fuzzy state estimator

This work presents a methodological proposal that, through a procedure of fuzzy state estimation, recreates the voltage and demand profile in the distribution system considering uncertainties. The methodology to evaluate the quality proposed here calculates the risk index operation out of the pre-settled voltage limits and quantifies the energy supplied with low quality levels from fuzzy voltage and load levels obtained at each medium/low voltage substation. After the application of the developed methodology to a real case of a radial feeder, those results are compared with the ones obtained by the direct method for quality evaluation through measurements. The methodology requirements show that the proposal has practical application at any distribution system that counts with an appropriate support system to systematize of users and network data.