Optimal Voltage Regulation and Power Sharing in Traction Power Systems With Reversible Converters

This paper proposes an efficient dc voltage control scheme in rail transit traction power systems with reversible converters for dc voltage regulation and power sharing. The proposed dc voltage control scheme is executed in a hierarchical structure based on the optimal power flow. Unlike conversional constant dc voltage control applied in traction power systems, this scheme allows the reversible converters operating in both rectifier and inverter regions and considers regenerative braking power sharing among multiple traction substations. The steady-state equivalent models of traction power systems including reversible converters are established, and the ac/dc sequential power flow algorithm based on Newton–Raphson method is presented. Finally, a multi-trains dynamic operation simulation is carried out with Matlab. The simulation results prove the validity of proposed scheme and indicate that the system energy saving effect in traction power systems with reversible converters is obvious with proposed scheme.