Controlador automático de fator de potência e de demanda.

Abstract

This work is dedicated to the construction of a single-phase automatic power factor and demand controller. The need to reduce costs for greater profitability in industrial production has increased interest by means of saving energy costs. Based on this, in this work, a prototype of the electrical equipment responsible for power factor control, coupled with demand control, was proposed and made low cost, aiming at the elimination of fines in the electric energy bill, for exceeding the consumption of reagents and contracted demand. The construction of the prototype was done by means of voltage and current sensors, electromechanical relays and an ATmega2560 microcontroller, belonging to the Arduino Mega 2560 platform, chosen due to its low cost and good performance. The voltage and current signals for the tests were simulated by MATLAB software and verified through a portable oscilloscope. In the operating range of the controller, the relative errors presented in the power factor test were less than 2% and 6% for active power measurements. The controller acted in a timely and effective manner, preventing fines in the electric bill.