INVESTIGATION OF HARMONIC CURRENT SOURCE EFFECTS ON DISTRIBUTION AND TRANSMISSION LINES CAPACITY AND LOSSES: CASE STUDY

Recently, power quality (PQ) has because a significant issue for both power supplies and customers. Researchers in all developed countries know that power quality is one of the factors of losses in the network. Increasing power electronic equipment changes current waveform in distribution networks and this can cause many problems in networks. Distortion of voltage waveforms results in the appearance of harmonic and sometimes non-harmonic frequencies in the network voltage. Harmonic distortions on the network voltage can cause additional losses and heating of certain network equipment, faulty operation of control equipment, an increase in peak voltage and disturbance and interference in neighbouring telecommunication systems. This paper will investigate the effect of harmonic on the sample distribution network losses and then the capacity of transmission lines. The harmonic studies consist of site background harmonic measurements at the existing local distribution substations, and computer-based system modelling based on site measured results. For modeling of system in computer we used ETAP power station software.