Assessment of the Repair Modes Impact on the System of External Power Supply System on Throughput Capacity of Traction Power Supply System

Abstract

As a rule, traction substations are supplied by an external power supply from two independent sources, since electrified railroads are referred to the 1st category consumers. In this case, 110 (220) kV transmission lines connect the network of external power supply with switchgear (SG) of traction substations. During the joint operation of external and traction power supply systems, the problem of strengthening the power supply systems emerges, when due to the increasing traction load on the power supply areas, the system operation indicators do not comply with the established regulations. At the same time, the capacity of the traction power supply system is influenced heavily by parameters of both the normal operation mode of the external power supply system and especially, by parameters of its operation repair modes. This is associated with the withdrawal for repairs of such major power sources as autotransformer substations. It is also associated with the disconnection of power lines that supply long sections of the traction power supply system. If, in this case, these sections have a complex mountainous profile with excessive gradients, then in some options of the repair modes of the external power supply system it is extremely difficult to ensure the passage of heavy-tonnage trains. One of the most problematic sections of the East Siberian Railway is the section of GN - SL with inter-substation zones having a mountainous profile, where, not only the voltage level in the contact network is reduced, when switching to repair modes, but also the voltage in the power lines of the external power supply system is significantly reduced when a load of overhead lines increases. Taking into account the growth of freight traffic volume up to 2025 while taking into account the prospective freight traffic volume, and in order to check the necessity of strengthening the systems of external and traction power supply of the researched railroad section, the combined model of these systems with different combinations of means of strengthening was developed on the basis of Fazonord PSW.