Alekseeva T. L., Ryabchenok N. L., Astrakhantsev L. A., Nemykina V. V. Analiz energeticheskoi effektivnosti asin-khronnogo elektroprivoda elektrovozov [The analysis of energy efficiency of asynchronous electric drive of electric locomotives]. Sovremennye tekhnologii. Sistemnyi analiz. Modelirovanie [Modern Technologies. System Analysis. Modeling], 2020, Vol. 65, No. 1, pp. 101–111. 10.26731/1813-9108.2020.1(65).101-111
10.26731/1813-9108.2020.1(65).101-111
The refined law of energy preservation in the electromagnetic field, spectral analysis of non-sinusoidal voltage, current used in operation and developed new energy characteristics of the electric drive allow us to take into account the main factors affecting the energy efficiency of the electric drive. The current consumed from the power source is significantly reduced compared to the three-phase rated current in the stator windings of the electric motor during the running-up, start-off and acceleration stages of the electric drive. As opposed to traditional methods, the authors for the first time prove the expediency of increasing energy efficiency through the proposed analysis of energy processes by using the voltage at the input of an electric semiconductor variator of the Irkutsk State Transport University design up to the amplitude of the alternating voltage of the energy source. In mathematical model of asynchronous electric drive, a spectral FFT-analysis of voltage and current is applied at the input of power regulator and in windings of electric motor stator at various stages of dynamic mode of electric drive operation. By means of blocks (Blocks Simulink / Math Operations) in the “MatLab” computer program, a resistance moment is formed on an electric motor shaft, taking into account nonlinear mechanical characteristic of the fan. Energy accumulators of electric field in the electric semiconductor variator and magnetic field in the stator of asynchronous motor provide full and continuous use of electric potential to compensate for losses of active power and to perform mechanical work by the asynchronous electric motor. The method of analysis of energy processes in the frequency-controlled asynchronous electric drive proposed in the article allows us to increase accuracy of evaluation of energetic processes in knowledge-intensive technologies and to eliminate methodological contradictions in the teaching process of educational institutions.
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