Abstract
Summary. The problem arising at the design of electric locomotives with asynchronous traction drive are considered. The electrical scheme provides the possibility of individual (by axle) control of traction motors. This allows realizing the operational disconnection/connection of one or more axles in the automatic mode, with account of actual load. In Part 1 of this paper, the complex computer model based on the representation of AC traction drive as controlled electromechanical system was developed. The description of methods applied in modeling of traction drive elements (traction motors, power converters, control systems), as well as of mechanical part and of wheel-rail contact, was given. In Part 2, the results of dynamic electromechanical processes modeling in various modes of electric locomotive operation (start and acceleration, traction regime in straight and curve railway sections, wheel-slide protection, etc.) are presented. In perspective, based on the developed model, the evaluation of locomotive's energy efficiency at the realization of various control algorithms must be obtained.
Highlights
A six-axle electric locomotive with individual control of traction motors is considered as a controlled electromechanical system which includes the mechanical part as multibody structure, the electrical part and the control block
It is modeled as an electric circuit, which consists of a main transformer, 4q-S input converters, a DC link and self-commutated voltage inverters for feeding the traction motors
Thereby, the control system sets the preset moment value equal to 0 at the electric locomotive commencing within 0.2 s from the start of operations that is necessary for the termination of the control transience of the rotor flux linkage
Summary
A six-axle electric locomotive with individual control of traction motors is considered as a controlled electromechanical system which includes the mechanical part as multibody structure, the electrical part (energy conversion devices and traction motors) and the control block (control algorithms and their realization). The energy conversion system provides the operation of the electric locomotive by feeding from catenary network of 3 kV DC and of 25 kV, 50 Hz AC. It is modeled as an electric circuit, which consists of a main transformer, 4q-S input converters, a DC link and self-commutated voltage inverters for feeding the traction motors. The ATM’s model is based on the presentation of induction motor as a system of magnet-connected contours. The mechanical part of the electric locomotive consists of a car body and three two-axle bogies. In Part 2, the obtained results of dynamic electromechanical processes simulation in various modes of electric locomotive operation are presented
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