Mediumandhighpowerfrequencyconvertersaresourcesofhigherharmonicsinthesupply network. ThereareRussianandinternationalstandards (GOST 51317.3.12-2006, IEC 61000-3-14, IEC-555, IEEE-519) thatimposerequirementsforissuingtheharmoniccomponentsofcurrentsconsumedbytechnicalmeans.Pressingissueisemissionsreductionofhigherharmonicsandimprovethepowerfactor.Promisingistheuseoffrequencyconverterswith two-and three-levelactiverectifierwithpowerfactorcorrection. Application ofactiverectifierwithpowerfactorcorrectionwillallowtheimplementationoftheinputphasecurrentswithlowcontentofhigherharmonicsandpowerfactorclosetounity, thepossibilityofimplementingenergyrecovery, andtheabilitytocontrolthevoltageonthe DC bus.The articleprovidesananalysisoftheemissionlevelhigherharmoniccomponentsoffrequencyconverterswith two-and three-levelactiverectifiers, powerqualityanalysisofthe DC andthepowerdissipatedintheIGBT keysofactiverectifiers.