Abstract Although the high power DC traction substations are using 12 pulse rectifier which have lower distortion than the classical 6 pulse rectifier, considering the high power, the reactive and harmonic components of the absorbed current are harmful to the power grid. The addition of an active compensator to the classical dc traction substation creates the “active substation”. The active … Continuă lectura Study of Indirect Current Control Methods for Urban Traction Active DC Substations