Static model of a 2×25kV AC traction system

Transport system, and especially railways as a part of it, has a highly significant place in the modern world. Railway system has a lot of advantages, comparing to the other type of transport, such as: comfort, economy, better control on the travel time and schedule and less risk factors. Development of high performance computers, growing complexity of traction drives and power supplies made possible and, moreover, necessary to model railway systems in order to provide its efficient planning, design and maintenance. This paper introduces a basis of the traction system modelling for high speed railway systems. First, a brief review of existing traction systems is given. Second, a 2×25kV AC bivoltage network is explained in details. Finally, a mathematical model of the static AC system has been proposed.