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Single phase currents and voltages were acquired from the primary winding of a locomotive transformer. Four operating regimes were considered (acceleration, running at constant speed, normal and respectively regenerative braking). 6 data sets consisting of 3 consecutive periods were considered as representative for this study and analyzed: one per each of the first 3 mentioned operating regimes and...
The paper is focused on finding appropriate procedures of denoising electrical signals (SN) acquired from the secondary winding of the excitation transformer in a large power group and evaluating their benefits. The signals were affected by white Gaussian noise with relatively high Signal to Noise ratios. The currents have significant harmonic contents (total harmonic distortions exceeding 25%). Two...
The paper deals with the design of an electric locomotive drive system used in electric railway transportation. The drive system consists of an induction motor and a voltage source inverter. A dedicated induction motor design algorithm is developed, in order to improve the motor efficiency. The design of the induction motor was realized with MathCAD and validated with Matlab Simulink. In the second...
The paper deals with a series of issues relative to power quality in drive systems and the behavior of a load composed from a uncontrolled rectifier, chopper and a DC motor. A MATLAB-Simulink scheme was designed in order to study the possibility to eliminate the unwanted power-related effects from the system. An equipment having the role of active filter is modeled and studied. The active filter is...
The paper is concerned with aspects related to the reactive power compensation capacitors influence over the current and voltage distortions. This work aims to discover if the use of capacitors for the reactive power compensation have more drawbacks than positive effects. A solution of compensation is modeled and simulated in the MATLAB/Simulink software environment. The compensation algorithm is...
A control strategy for positioning systems used in hail suppression is presented in this paper. The proposed position control solution is designed to obtain a precise control of the launch pad position over the azimuth and elevation, resulting in controlling a system with two degrees of freedom. The proposed strategy has been simulated starting from a permanent magnet synchronous motor that was modeled...
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