Autor/autori: Ion POTÂRNICHE, Cornelia POPESCU, Mina GHEAMALINGA

Abstract: The power static converters, products used intensively in industrial applications of type as energy conversion, traction, equipment and lifting equipment structure and others, are characterized through two validates abilities in the industrial practice: utility and efficiency energy. This paper presents the related aspects to the efficiency energy of this converters, putting into evidence there advantages and the less known disadvantages, too. On the base of the mathematical models of the converters and by means of the practical results of this usage in the industrial applications, there are analyzed solutions to remove the shortcomings occurring from the power static converters used in industrial applications. The practice proved that the listed advantages of the static converters in specialty literature by the point of view of efficiency energy, only in the case of converter utility, are reduced by the point of view of power balance by the total efficiency energy of the applications where there are used. The analyze of operating influence of one static converter about the power supply source is realized in the case of one application where the converter load is a power lifting equipment about of 850 kW. The total supplementary loess calculation, reported at transformed utile power, justifies the advantage of power static converters for the efficiency energy of technological processes, where there are used.

Keywords: efficiency energy, converters, energy balance, harmonic content