Kozlova O. Improving the energy efficiency of urban electric transport power supply systems.

The thesis is devoted to the decision of an actual scientific problem of efficiency increase of power supply systems functioning of city electric transport and decrease in specific expenses of power resources in the course of passengers transportations. Based on the analysis of the energy supply efficiency of the transportation process on urban electric transport, the influence of factors on the specific consumption of energy resources is determined. The choice of factors influencing the reduction of specific costs of energy resources on urban electric transport is substantiated. Among them: increasing the energy efficiency of traction power supply systems, the amount of energy recovery and optimization of trams and trolleybuses in terms of electricity consumption. A method for determining the energy saving potential of urban electric transport and forecasting energy needs for the future is proposed, which allows efficient use of technical means and technologies of energy saving units of power supply, track, traffic and tram and trolleybus depots to reduce specific energy costs. The forecast for the future is determined on the basis of the assumed principle of models of indicators of transport process and the analysis of available potential of energy saving by 2035 of size of specific consumption of energy resources. A comparative evaluation of methods for calculating instantaneous circuits on the example of a two-track section of a tram line and as a result of calculations of current distribution, voltage loss at circuit nodes, power loss by matrix and traditional methods, proved the effectiveness of the matrix method. Generalized methods for determining power flows on the traction network using simulation models and real measurements in automated commercial electricity metering systems have been developed for the selection of energy-saving power supply schemes when changing the passenger flow.