Improving the Energy Efficiency of the Centralized Power Supply of the Moscow Metro by Switching to a Nodal Power-Supply Scheme for the Traction Network

Feasibility of switching from a two-way separate power-supply scheme of the traction network to a nodal scheme by installing sectioning posts and parallel connection points is considered using the example of the traction power-supply system of the Arbatsko-Pokrovskaya Line of the Moscow Metro. The traction network is analyzed for the possibility of connecting sectioning posts. The criteria are the length of intersubstation zones with a centralized power-supply system, as well as free areas in the above-ground and, especially, in the underground parts of the metro. The two most suitable sections of the traction network in the intersubstation zones of substations are selected. Traction power-supply system simulation modeling of the Arbatsko-Pokrovskaya Line without sectioning posts and with their use on the selected sections of traction network is performed. Data on the electricity consumption of traction substations, as well as on electricity losses in the traction network for various power-supply schemes, are presented. The electric rolling-stock voltage oscillograms as a function of time are given for different power-supply schemes of the traction network. Statistical processing revealed that, in total, for the two tracks, the effect of using sectioning posts by voltage level is hardly noticeable. Based on the simulation modeling data statistical processing results, the technical and economic effect of using sectioning posts in two intersubstation zones is shown.