High quality energy is necessary to end-users domestic or industrial customers of the public electric distribution networks. The quality of the electric power is characterized by the measurement and the analysis of the electric disturbances which make it possible to understand the origin of the disturbances, to evaluate their impact on the sensitive equipment, and thus to find and choose the most suitable solution either economically or technically. This paper aims to introduce the possible relevance of the evolution of the intervention function of a DVR (Dynamic Voltage Restorer) as a new technique to reduce and/or attenuate the various electric defects in voltage influencing the quality of energy supply.