An adaptive scheme for power-related measurements and power-factor correction

摘要

This paper presents a fast, low cost and accurate instrumentation scheme for power-related measurements and power-factor correction. These measurements include the root-mean-square values of current and voltage, the active and reactive powers, the total harmonic distortion and the true power factor. It is a microcontroller-based digital sampling system which runs a fast algorithm for displacement power factor measurement. The controlling system monitors and senses any variations in power factor, and accordingly switches the appropriate capacitor combination across the load. The scheme presents an economical and efficient solution to the power distribution companies for its customers.