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Objective: To improve the subsidiary electric drive of high-speed electric stock by applying asynchronous drive frequency regulator. Methods: Fuzzy logic concepts were applied for an automatic control system regulator. Results: A computer model of the regulator was developed and the results of modeling were presented in the form of optimization process of load moment stepped variation by the control system with standard and fuzzy logic controllers. Practical importance: On the basis of the introduced computer model, transient analysis is possible in automatic control system of the subsidiary electric drive of the high-speed electric stock. The research findings may be used in the design of new and retrofit of the existing automatic control systems of the subsidiary electric drive with improved characteristics of control performance.

Purpose: Development of circuit solutions for pulse converters with improved control parameters for DC electric trains with a collector traction drive. Methods: The analysis of semiconductor control systems of DC electric trains is carried out. The calculation of frequency characteristics of the converter at using the parameters of traction motors of ED4M electric train is made. Results: Separated regulation of the currents of the armature and excitation windings makes it possible to realize the stability of braking system with pulse converter and the absence of motor current surges. Practical importance: It is expedient to use the considered circuit solutions on mainline railway electric trains that will allow expanding the speed range in electric braking mode and increasing the energy efficiency of a rolling stock.