Increasing the accuracy of the calculation of power supply circuits for traction loads of 25 kV AC railways
The article is devoted to the topical issue of choosing a power supply scheme for traction loads in order to reduce the energy intensity of the transportation process by electric rolling stock. It is proposed to improve the energy efficiency of electric rolling stock power supply by choosing normal power supply schemes for traction loads at forecast time intervals of the calculation period with counter interval regulation. In order to improve the accuracy of choosing normal power supply circuits for traction loads, a methodology has been developed for calculating the predicted currents of the arms of traction substations, taking into account the heterogeneity of the resistances of external and traction power supply systems. The calculation of the predicted currents of the shoulders of traction substations takes into account the actual voltage difference on the substation buses and improves the accuracy of determining the modules and arguments of the currents. The choice of normal power supply schemes for traction loads in the time intervals of the calculation period when calculating of electric currents of the shoulders, taking into account the resistances of the external and traction power supply systems, ensures the fulfillment of the train schedule, reducing technological and additional losses of electrical energy.