Goolak S. Increasing the energy performance of AC electric locomotives through reactive power compensation adapted to the power supply system

The dissertation is devoted to creation of scientific bases of a choice of optimum parameters and operating modes of system of compensation of reactive power on electric locomotives of alternating current and adaptation of work of system of compensation to parameters of traction power supply. To perform research, mathematical and software-oriented models of traction and auxiliary drive of an AC electric locomotive (on the example of VL-80K electric locomotive) were developed. Distinctive features of these models are the ability to take into account the mutual influence of the traction drive and auxiliary units and modes of operation of the electric locomotive. Experimental confirmation of the adequacy of the developed simulation models with real traction and auxiliary drive for rolling stock is performed. On the basis of the developed models electromagnetic processes in traction and auxiliary drives are investigated that allowed to estimate them qualitatively and quantitatively. The power scheme of the hybrid reactive power compensator and the control scheme of its active part are developed. The basis of the control system is a method for determining the spectral composition of the traction current based on the Levinson-Darbin algorithm, which will adapt the operation of the compensator to the parameters of the power supply system. It is proposed to use a static converter instead of a phase release in the auxiliary drive system. The calculation of total power losses before and after the modernization confirmed the economic feasibility of introducing a reactive power compensator and the use of a static converter in the system of auxiliary machines instead of a phase breaker.