New approach for estimation of harmonics in the electrical network

Industrial and domestic equipments use non-linear electronic components. As examples of these non-linear loads: rectifiers, inverters, choppers or in a general manner, all equipments using the electronic switches and the junctions with semiconductors. This creates non sinusoidal electrical currents which will be injected in the electrical supply network. These non sinusoidal currents present other frequencies added to the usual 50Hz. These parasitical frequencies, multiple entireties of the frequency 50Hz, will inevitably cause harmful effects on the electric installations, loads and even sources. It is called the pollution of the electrical supply network. In this paper a new approach for estimation of the parasitical frequencies generated, as example by PC (Personal Computer) switching power supply, is proposed. The estimate of these parasitical frequencies is a preliminary phase which precedes usually their elimination.