Abstract
This article is devoted to assessing the transit of electricity from an external electrical power supply system through the traction network of a railway district that includes nine traction substations. Substation transformers has star-delta-11 connection. The paper presents a simulation model of the railway district implemented in the MATLAB/Simulink software package. Various options of loading the external power supply system are modeled including into account the symmetrical load of the external network and the single-phase load of traction substations. The values of the voltage difference on the traction windings of power transformers of adjacent substations that occurs at different loads, the balancing currents that this difference creates and real power losses in the inter-substation areas are calculated.
Highlights
IntroductionThe volume of traffic on the Far Eastern Railway of the Russian Railways branch is increasing and their implementation requires the strengthening of the traction power supply system, which, as a rule, leads to a decrease in the resistance of the traction network and helps to increase the flow of electricity from the external power supply system to the traction system
At present, the volume of traffic on the Far Eastern Railway of the Russian Railways branch is increasing and their implementation requires the strengthening of the traction power supply system, which, as a rule, leads to a decrease in the resistance of the traction network and helps to increase the flow of electricity from the external power supply system to the traction system
The results of simulation the balancing current that occurs in the traction network with the above-described load variants of the external system are presented in table 2
Summary
The volume of traffic on the Far Eastern Railway of the Russian Railways branch is increasing and their implementation requires the strengthening of the traction power supply system, which, as a rule, leads to a decrease in the resistance of the traction network and helps to increase the flow of electricity from the external power supply system to the traction system. Voltage losses in the traction windings of transformers that supply ISA with the leading and lagging phase are determined by the formulas:. The purpose of the research is to evaluate the flow of electric energy amount from an external electrical power supply system through an AC traction network on a railway district. The objectives of the research are, firstly, a creating a simulation model of the power supply system of an electrified railway district, secondly, simulating the flow of electricity with various load cases of the power supply system; thirdly, assessing the effect of power-factor correction units and series capacitor banks on the flow of electricity through the traction network; fourthly, assessing the effectiveness of measures to reduce balancing current.
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