This paper presents an analysis of harmonic decomposition and power quality analysis of a six-phase asynchronous motor drive model designed for traction systems, by the Fast Fourier Transform tool. The six-phase asynchronous motor is fed by a Voltage Source Inverter. The goal is to determine whether the proposed 6-phase traction system is viable to prototype and test from the standpoint of power quality and electromagnetic compatibility. The resulting power quality distortion by harmonics suggest that the proposed traction system generates acceptable distortions, through but for which the accepted FFT analysis, in the IEEE Standards 1459-2010 and 519-2014, is not an efficient tool for analysis of highly dynamic traction systems. For a good representation of power distortions, a different standard should be developed and employed
This paper presents an analysis of the power quality impact and electromagnetic interference in a trolleybus traction system. As test subject it is used a 180 kW induction motor supplied by a three phased inverter with field oriented control. A fast Fourier transform was used in a simulation process, to determine the power quality and electromagnetic interference processes of the current supplied to the motor.
This paper approaches problems of tram DC motors traction system modernization, system widely used in the area of Eastern Europe. First, the state-of-the-art and an overview of trams equiped with DC motors and classical rheostatic control system are presented. Poor economic status of this region only allows upgrading these trams with modern power converters. These improve the burning issues and allow reducing energy consumption and raising operational reliability. Second, the paper proposes the rehabilitation of the traction system with an new developped electronic module SDMC-103-04. In developping such a microcontroller based system is important to consider the characteristic problems in tram applications. Some of these problems relate to the friction between the wheel and rail (braking problems), or to the synchronization of the motors, when a multi-motor system is used. The developed module SDMC-103-04 has been tested on 71-605 tram type and confirmed the energy consumption reduction with about 30-40% and reliability increasing with about 20-25%.
The paper deals with the evaluation of root mean square deviations and maximum absolute relative errors associated to the decomposition followed by recomposition based on Wavelet Packet Transform (WPT) of signals pol-luted with harmonics. Subtrees associated to sets of harmonics presenting practical interest for industrial applications are addressed. The study uses artificial signals generated through the superposition of perfect sinusoids with pairs of harmonics which proved to be related in an almost exclusive manner to pairs of nodes from the bottom level of a WPT tree. 4 parameters had to be considered when determining the maximum and minimum values of errors for each set: the clustered harmonics’ magnitudes and their phase-shifts relative to the component of fundamental frequency. The decomposition/recomposition are time-efficient due to an original system of flags labeling each node from the WPT tree. For each analyzed set of harmonics, 3d graphical representation of minimum and maximum errors along with the associated 3d graphical representation of the phase-shifts are provided. At the same time, per set limits of errors ranges were established and discussed while specific patterns were deduced for the context in which extreme errors appear (phase-shifts and harmonic magnitudes). The results were commented, and conclusions were drawn.
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