Artemenko A. Traction electric drive with adaptive control under varying coupling conditions on electric quarry locomotives

The dissertation is devoted to solution of an actual scientific problem of development of principles, methods of calculation and control parameters of a traction DC electric drive of a quarry electric locomotive, providing increase of its operational parameters taking into account change of conditions of coupling. The features analysis of traction electric drive operating conditions for multi-motor electric drives of open-pit locomotive, the existing ways of their improvement has been done, and it has been proved, that insufficient attention has been paid to the issue of electric drive control with account of traction electric drive parameters change during their operation, repair and at change of coupling conditions. The paper studies operation modes of multi-motor electric drives at non-uniformity of traction motors parameters, establishes values of excess losses and reduction of winding insulation lifetime. The probability of completing multi-motor electric locomotive drive with traction motors with permissible deviations of winding parameters, but exceeding permissible limits of deviations between them is analyzed which allows timely updating of the enterprise’s repair fund and thus reducing traction electric drive failure rate. The calculation of DC traction motors parameters on the basis of state space method which allows calculating parameters in dynamic mode, when tension on a motor armature is formed by control system and varies in time, increasing accuracy of definition of equivalent parameters of the electric drive. On the basis of developed mathematical models of mechanical part of bogie and traction electric drive control principles of multi-motor electric drive with non-uniformity of load between motors have been further developed. The essence of these principles is in formation of excitation control signal of traction motors with account of their parameters non-uniformity and change of conditions of wheelsets coupling with rail track which provides more precise load equalization between motors. The degree of load equalization from asymmetry of parameters and change of conditions of wheelset coupling with rails is determined. Experimental studies have been conducted using a laboratory research stand, which allows simulation of wheel slippage for traction electric drive. Studies have confirmed the possibility of load equalisation of traction motors. The estimation of economic effect from application of proposed methods of parameters control and management of traction electric drive of open-pit electric locomotives used at Ferrexpo Poltava Mining quarry has been substantiated.