A parameter that allows an evaluation of power quality transmitted, or distributed, between energy source and the final user is electric system power factor. Among other aspects, a bigger power factor, close to unit value, relieves operational conditions of lines and cables, besides, it improves feeder's voltage behavior. Due to load variation along the day, the dynamic compensation of power factor allows maintaining this parameter close to the ideal. This paper brings a study about a reactive dynamic compensator based on the voltage control in a capacitive element, varying the reactive energy in accordance with the system demand, everything from the energy efficiency point of view. In distribution systems, the losses due to this variable compensation can be lower than in other compensation methods and also the voltage presents a better behavior, justifying its application.

Resumo-O objetivo deste trabalho é apresentar uma metodologia de comparação do desempenho de sistemas de bombeamento controlados por válvulas de estrangulamento e a utilização de inversores de freqüência no controle da vazão. Adicionalmente, identificar a redução do consumo de energia elétrica bem como justificativas da escolha de um sistema em detrimento do outro. Palavras-Chaveeficiência energética, inversor de freqüência, sistemas de bombeamento.