Analysis of power losses in catenary wires in AC electric traction power supply systems when installing a device for shunt compensation of reactive power

Abstract

The research is aimed at studying the catenary wires power losses change by transverse capacitive compensation with considering the movement of trains on the intersubstation zone. Calculations instantaneous and average catenary wires power losses while passing through the intersubstation zone one train and two successive trains are presented in this article. Losses are determined for two cases: when installed compensating device and in its absence. The values of the differences of these losses are founded. The computer simulation in MATLAB-Simulink software was implemented. According to the results of calculations graphs were built, illustrating the change of catenary wires power losses while moving trains on the intersubstation zone when installed compensating device and without it, as well as the differences between the said losses. Average values of catenary wires power losses were determined by integrating these functions and their comparison is carried out. Calculations have shown that by selecting compensating device power by the average reactive power consumed by a train, its intersubstation zone passage with constant current causes the same average catenary wires power losses as in the absence of the compensating device. Increasing the number of trains, simultaneously located on the intersubstation zone at the same compensating device power, entails a reduction of catenary wires power losses with respect to a similar situation without the compensating device, but at the same time reactive power is compensated only partially.