Application of Renewable Energy Sources in Railway Power Supply Systems of Direct Current

Using renewable energy sources (RES) in power supply systems of rail transport (PSSRT) makes it possible to increase the reliability of energy supply for transportation processes, improve their energy efficiency and improve the quality indicators of electric power. Computer models of the power supply system of a section of a DC main railway were developed to obtain quantitative indicators characterizing the results of using RES. Wind farms, the capacity of which varied over time, were connected to the inputs of 10 kV traction substations. These models can be used to solve the following problems: assessing the impact of RES on the quality of electric power; determining the areas of their application in PSSRT; identifying the best places to place RES in networks. The results of digital modeling of PSSRT showed that the following positive effects are achieved due to VP: voltage supplied to electric locomotives increases by 1…2.5 %; coefficients at the inputs of 110 kV traction substations (TS) decrease by 60…64 %; harmonic coefficients are reduced by 2.6…2.8 times; average values of power losses in the main 110 kV transmission line are reduced by 2.4 times. Thus, the use of renewable energy sources makes it possible to stabilize voltages on electric locomotive current collectors, reduce asymmetry and non-sinusoidality levels on 110 kV TS buses, as well as electricity consumption from the EPS and electricity losses. Thus, the use of renewable energy sources makes it possible to stabilize voltages on electric locomotive current collectors, reduce asymmetry and non-sinusoidality levels on 110 kV TS buses, as well as electricity consumption from the electric power system (EPS) and electricity losses. Thus, based on the integration of renewable energy sources into the RES, it is possible to increase energy efficiency indicators and improve the quality of electricity. Due to the reduction in electricity consumption from the EPS using thermal power plants, greenhouse gas emissions can be significantly reduced.