This paper presents an equivalent model that allows representing bi-voltage autotransformer-based systems (such as 2 25 kV ac, 2 15 kV ac) as if they were monovoltage systems. This model can be used for symmetrical (such as 2 25-kV 50-Hz systems) and unsymmetrical (such as 12/24-kV 25-Hz systems) configurations. It is based on two simplifying hypotheses that establish relationships between currents and voltages in the positive and negative phases. These hypotheses are discussed and the accuracy of the model is evaluated by comparing the results with a detailed conventional model of power-supply systems.
The design of the electrical supply system of high-speed railway lines involves the selection of the single phase system (one or two active conductors: lx25kV or 2x25 kV), the design of the catenary, and the location and sizing of the substations and the autotransformers in case of a 2x25 kV system. The electrical system should be designed so the train voltages are in the admissible range and the conductor currents and transformer powers are smaller that their rated values. This paper presents a simulation tool for the design of the electrical supply system of high-speed railway lines. The tool is composed of two main modules: (1) the simulator of the railway line and (2) the electrical system simulator. The railway line simulator determines the position and power consumption of each train at each time step provided the line operation policy. The electrical system simulator solves the AC network at each time step and provides the catenary and train voltages, the conductor currents and the transformer power flows.
This paper presents a reduced model of 2x25 kV electrical systems for high speed railways. The structure of both the proposed reduced model and the 1x25 kV system are similar. This reduced model has been developed to be included in an design optimization program of high-speed railways power supply systems. The accuracy of the reduced model is checked with a detailed model of power supply system of high speed-railways.
This paper presents an optimization procedure to determine the topology of AC railways power supply networks: location and type of the substations, catenaries to be used, location of neutral zones and location of autotransformers in 2×25kV systems. In the proposed procedure, a mixed integer programming problem (MIP) is formulated in order to minimize the total construction cost associated to the power supply network while satisfying technical constraints to ensure proper behavior of power supply system. The performance of the proposed procedure is evaluated for a study case corresponding to a part of the new Madrid-Barcelona high-speed line and the obtained results are discussed.
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