The feeding system of the electrified railways in Hungary is challenged by increased power consumption due to more traffic and new trains (locomotives) with higher rated power, which lead to higher quality requirements against the traction power supply system and therefore necessary for electrical parameters to be more accurately and thoroughly analyzed.
In the first section of my university thesis the most commonly used traction supply systems (conventional and specifically ones) are demonstrated with a little historical background focusing on the Hungarian practice. It is also introduced where the traction system located in the national and international power system.
The second chapter contains an overall description about the functions and operation of the new railway simulation software developed in MATLAB, which is capable of calculating the most important electrical quantities of a simple 1x25 kV feeding system.
In the third chapter the calculation methods are described, naturally with mathematical formulas. These models are competent to calculate voltage drops, power losses, energy consumptions, power energy losses caused by locomotives and other fixed installations. Short-term power limits of traction transformers are important to define the rated power of the substation transformer. Fixed installations are taken as railway stations into consideration because they have huge power consumption, such as rail and train heating systems.
The last section contain simulation results about feeding sections of Nyekladhaza conventional 1x25 kV traction substation during normal and abnormal (blackout of the neighboring transformers) operation, which are compared with the results of an older software developed at the Department of Electrical Power Engineering.