Abstract
Operating modes of the single-phase 4qs transducer with pulse-width modulation as part of the AC electric rolling stock are investigated. The method is developed for determining the PWM parameters, at which the optimum transducer mode in terms of minimizing the reactive power in the “locomotive-traction network” system is implemented. The features of the developed method are the division of the process of determining the optimum PWM parameters into 2 steps. This allows removing unnecessary blocks from the simulation model and reducing the total simulation time. At the first step, the values of the power factor and current of the DC link in the whole range of coefficients of modulation and shift between the network current and the reference sine-wave signal are determined. Further, from the received data array, pairs of values of the PWM parameters, which ensure the highest power factor of the “electric locomotive-traction network” system are allocated and entered into the table system for setting the PWM parameters. At the second step, the dependences of power loss, and, consequently, both the efficiency and total harmonic distortion of the network current on the transducer clock frequency are determined. The determination of power loss is based on the calculation of the energy dissipated for 1 s on the IGBT transistor and snubber resistor depending on instant values of current through them
Highlights
Current trends in the development of electric rolling stock require the creation of modern energy-saving technologies in traction electric drives [1].The increase of power efficiency of electrified railroads is achieved through various measures
Power efficiency of the rolling stock is affected by the efficiency of using traction and regenerative braking modes [5, 6], design and element base of power circuits, and so on
The most widespread in the AC rolling stock were input traction transducers with zonephase regulation. Due to their peculiarities, such transducers produce a large amount of reactive power and higher current harmonics, which negatively affects the power factor and electromagnetic compatibility of the rolling stock
Summary
Current trends in the development of electric rolling stock require the creation of modern energy-saving technologies in traction electric drives [1]. Power efficiency of the rolling stock is affected by the efficiency of using traction and regenerative braking modes [5, 6], design and element base of power circuits, and so on. The most widespread in the AC rolling stock were input traction transducers with zonephase regulation. Due to their peculiarities, such transducers produce a large amount of reactive power and higher current harmonics, which negatively affects the power factor and electromagnetic compatibility of the rolling stock. The work aimed at researching traction transducers with a reduced level of the reactive component and higher current harmonics of the network is considered relevant
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