Bidirectional static system for active D.C. traction substations: Theoretical and experimental evaluation

This paper is focused on the presentation of a active filtering and regeneration system (SISFREG) developed for converting the DC traction substations in active substations. SISFREG will be connected between the catenary-line and the primary of the traction transformer, via a dedicated transformer. The main component of SISFREG is a shunt active power filter based on voltage source inverter structure, whose control guarantees the keeping of the prescribed voltage on the DC-side and the proper current at the inverter output by the indirect control of the supply current. The DC voltage controller is tuned in accordance with the Modulus Optimum criterion and the grid current controller is of hysterezis type. In order to verify the operation of the system and assess its performance, detailed computer simulation studies were conducted using the Matlab/Simulink package. Finally, a laboratory model was designed and build. In order to testing the system and showing its performances, an experimental setup was configured. The experimental results confirmed the good performance of the system during both traction/filtering and regeneration regimes.