Abstract  The attention in this paper is directed to the transformation of an existing DC-traction substationsequipped with 12-pulse parallel uncontrolled rectifier into an active substation. In this manner, the traction substation gains the capability of redirecting the braking energy to the power supply and the power quality indicators during the traction regime are greatly improved. The practical solution lies in … Continuă lectura Performance of an Active DC-Traction Substation with 12-Pulse Parallel Rectifier and Indirect Current Control