Apart from the classical cycle conversion there exist also other methods of direct frequency conversion. The paper characterizes different developments in this field. The first of the considered conversion methods is based on the approximation of the converter output voltage to the reference (standard) voltage by selection of such a two-value three-phase voltage combination that possesses the most long-lasting integral voltage deviation from the reference in a respective time interval. Here summation of different on-load input voltages is performed by a 3 - phase input voltage regulator. The second method is characterized through the formation of the direct rectified voltage without pulsations theoretical and practical capabilities overview. The third of these control methods is pulse - width modulation that can be performed in matrix structures. The aim of the work is to contribute to development of yet unknown or untapped potentialities of direct conversion. Based on these solutions, the environment-friendly conversion of the necessary electric energy parameters could be expected.