Voltage Oriented Control of an Innovative Bidirectional 3 kV Railway electric substation using Parallel Three-Level NPC Converters

Italian railway system is based on 3 kV DC voltage and it is connected to the AC grid through electric substation which are realized with diode rectifier. This configuration does not allow power reversible operation and regenerative braking is not possible with a consequent waste of electric energy which is dissipated on braking rheostats. The present paper proposes a bidirectional electric substation configuration based on NPC parallel connected converter. A control strategy is proposed and simulation results are presented.

[1]  Bindeshwar Singh,et al.  Multilevel inverters: A literature survey on topologies and control strategies , 2012, 2012 2nd International Conference on Power, Control and Embedded Systems.

[2]  Dario Zaninelli,et al.  Bidirectional ESS for railway power supply , 2013, AEIT Annual Conference 2013.

[3]  José R. Rodríguez,et al.  A Survey on Neutral-Point-Clamped Inverters , 2010, IEEE Transactions on Industrial Electronics.

[4]  Dario Zaninelli,et al.  Conversion systems for braking energy recovery in 3 kVDc railway lines , 2015, 2015 AEIT International Annual Conference (AEIT).

[5]  Hossein Madadi Kojabadi,et al.  An intelligent strategy for regenerative braking energy harvesting in AC electrical railway substation , 2017, 2017 5th IEEE International Conference on Models and Technologies for Intelligent Transportation Systems (MT-ITS).