Bologna - Florence high speed railway line: MV emergency traction power supply, operating conditions and PQ issues

The paper illustrates the characteristics and operating modes of the emergency traction power supply system implemented on the Bologna - Florence line of the Italian High Speed network which is electrified at 2x25kV, 50Hz. The paper first describes the main characteristics of the equipment installed, the design criteria and power supply scheme. The paper goes on to outline the challenges of power quality associated with the connection of a heavy single phase load to the Medium Voltage (MV) network. The effectiveness of the installation and the evaluation of voltage unbalance compatibility levels compliance are then presented. ©2010 IEEE

Supply system characteristics and harmonic penetration studies of the new high speed FS railways line "Milan- Rome-Naples"

The Milan-Rome-Naples, main railway connection of the Italian State Railways (FS) network, is characterized by very intense traffic, with the existing lines already having reached their saturation limit. New lines are to be constructed. The infrastructure is planned with line alignment and routing characteristics intended to permit speeds of up to 300 km/h. The project has been developed envisaging use of the traditional 3 kV d.c. system. Topics discussed are the catenary, electric substations, and harmonic penetration studies

A high traffic density metro electrfied at 2x25 kV 50 Hz

The paper reports a complete study of electrical power system on a metro line under construction in Buenos Aires supplied at 2x25 kV-50 HZ. The metro line, is at the forefront from the technological point of view, because of it represents one of the very few examples of a metro line with a 2x25 kV alternating current electrification system.The results of traffic and electrical simulations of the proposed 2x25 kV-50 Hz electrical system are presented, including energy performance due to the braking recovery, considering time shifting of departures.Different network operations, have been taken into account considering the out of service of main electrical substation. Electrical standard requirements have been taken into account to verified the results performed.Overloads of electrical machines, voltage values on the pantograph, step and touch voltages and voltage unbalances have been calculated

Individual driving style impact on traction energy consumption in railway lines: A simulation model

The study reports some energy saving evaluations in rail transit due to appropriate driving styles. Several simulations were performed on an Italian 3 kV d.c.railway line feeding high-speed and two regional trains. Different scenarios about braking phases and coasting management are reported to quantify energy saving. Evaluation of the energy recovered during the braking phases for a traffic scenario is also reported