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Power conversion by virtue of its basic role produces harmonics due to theslicing of either voltages or currents. To a large extent the polluTIon in theuTIlity supply and the deterioraTIon of the power quality has been generatedor created by non-linear converters. It is therefore ironic that power convertersshould now be used to clean up the polluTIon that they helped to create inthe first place.In a utility system, it is desirable to prevent harmonic currents (which resultin EMI and resonance problems) and limit reactive power flows (whichresult in transmission losses).Traditionally, shunt passive filters, comprised of tuned LC elements andcapacitor banks, were used to filter the harmonics and to compensate forreactive current due to non-linear loads. However, in practical applicationsthese methods have many disadvantages.
