Indirect Current Control of a Filtering and Regeneration System used in DC Substations for Urban Traction

The aim of this paper is an easier control method for an active filtering and energy recovery system for high power DC traction substations. This system converts the classical dc traction substation, with 6-pulse three-phase bridge rectifier, in an “active substation”. The active substation allows both the braking energy recovery to the power grid and the compensation of current harmonics and reactive power of the current absorbed from the power grid. To achieve this goal an indirect current control method had been investigated and implemented both on a virtual system and on a scale experimental model.