Improved Differential Strobe Terminal Based Open-loop Control of Smart Power Factor Metering System

This paper presents a smart power factor metering system to measure the power factor of a load by taking the frequency of a main-line. The variation of frequency makes sure the poor power factor (PF) which increases the utility charge. The proposed system provides the accurate FF by plotting a real-time AC power triangle in MATLAB environment. The system uses one embedded system as a controller that able to read the mainline frequency, load voltage, current and their phase difference. A preliminary circuit is used to transform the high value of voltage and current to the embedded system (ES) readable form. It consists of a potential transformer (PT), a current transformer (CT), high differential strobe terminal based comparator and logic gate that detects the phase delay between the load voltage and current. A serial communication between the ES and the MATLAB is established for plotting the power triangle which confirm the accurate PF. The simulation and experimental results are studied to validate the effectiveness of proposed system.