Patent ID: 8185358
Filing Date: 2012-05-22
Classification: G01R

Abstract:
1. A method of measuring a power quality index, comprising: measuring a total current waveform of an ingress from a customer, and a current waveform and a voltage waveform of each of at least one load installed at the customer; computing a load composition (LC) of the customer by modeling with resect to a configuration of each of the at least one load using the total current waveform of the ingress and the current waveform of each of the at least one load; computing a total harmonic distortion (THD) of each of the at least one load by performing a discrete fast fourier transform (DFFT) using the current waveform and the voltage waveform of each of the at least one load; and computing a distortion power quality index (DPQI) of each of the at least one load by multiplying the LC and computing value based on the THD.