| Abstract |
Power quality monitoring is a relatively recent problem but its complexity has been already proved. In
fact, the propagation of the harmonic distortion has been affecting the electrical networks for several
years, but it is recently assuming a growing importance because of the large diffusion of non-linear
loads. Hi-fi, computer, discharge lamp, battery charge, UPS, electrical drive are typical distorting
loads.
In this work two new indices to evaluate the quality of the power absorbed by a non-linear load have
been proposed. They rely on voltage and current waveform measurements at the point of common
coupling. Several simulations and experimental tests have been carried out and they have proved that
these new indices are less sensitive to the network voltage conditions than the traditional ones.
They are able not only to give an estimate of the harmonic distortion of the current flowing in an
electrical network, but they can also evaluate the responsibilities of distributors and customers. |
