Development of the ñonverter structure that enables power supply to traction induction motors of mine electric locomotives from different levels of voltage

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.148776

Keywords:

induction motor, autonomous voltage inverter, pulse­width modulation, electric losses, harmonics coefficient, mine electric locomotive

Abstract

We have proposed an adjustable structure of the converter of energy of electric drive in the electrotechnical complex of a mine electric locomotive from power sources with different voltage levels ‒ from a contact network and a battery of traction accumulators. A characteristic feature of the converter is the presence of inverter units that can be connected either sequentially or in parallel. When powered by a low­voltage source, inverter units are connected in parallel over the entire range of change in the output voltage. When powered by a high voltage source, inverter units are connected sequentially in the range of low output voltages and in parallel in the range of high output voltages. Such an approach makes it possible to align the power voltage levels of traction asynchronous motors of a mine electric locomotive at a lower level. The expected alignment of voltage levels is carried out at a lower level compared to a standard circuit of the three­phase bridge autonomous inverter and is achieved by controlling the paired bridges in the power circuit of traction induction motors. Given this, the frequency of voltages of width­pulse modulation does not change, which is important for the process of reducing dynamic losses of power in the drive’s elements.

It has been confirmed that an increase in the output voltage distortion coefficient in the IGB­transistors of the inverter with the minimal level of energy losses in the electric drive’s elements is achieved by modulating the voltage at a constant switching frequency at different voltage levels. We have proven the fact that the best indicators for the harmonic coefficient were obtained at frequencies about 30 Hz, which are the working ones, so the converter operating mode is most effective at these frequencies. The result of analysis of the classical scheme of the inverter has revealed that increasing the frequency of pulse­width modulation by three times significantly increases electrical losses in the windings of traction electric motor. In the proposed circuit of the voltage inverter of engine’s power, at leveling the voltage at low level, there is no need to increase the frequency of pulse­width modulation, which does not lead to a growth in the electrical losses in a traction motor

Author Biographies

Oleksandr Lazurenko, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Associate Professor

Department of Electric Power Stations

Dmytro Shokarov, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD

Department of the Electric Power Stations

Viktoriia Chorna, Kremenchuk Mykhailo Ostrohradskiy National University Pershotravneva str., 20, Kremenchuk, Ukraine, 39600

PhD

Department of systems of power consumption and energy management

Olha Melnyk, Kryvyi Rih National University Vitaly Matusevich str., 11, Kryvyi Rih, Ukraine, 50027

PhD, Associate professor

Department of power supply and energy management

Halyna Cherkashyna, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD

Department of Electric Power Stations

Vladyslav Volynets, Lutsk National Technical University Lvivska str., 75, Lutsk, Ukraine, 43018

PhD

Department of the Power Supply

Olesia Antsyferova, National Technical University «Kharkiv Polytechnical Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Postgraduate student

Department of Technology of Machining Machines and Metal Versions

References

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Published

2018-11-29

How to Cite

Lazurenko, O., Shokarov, D., Chorna, V., Melnyk, O., Cherkashyna, H., Volynets, V., & Antsyferova, O. (2018). Development of the ñonverter structure that enables power supply to traction induction motors of mine electric locomotives from different levels of voltage. Eastern-European Journal of Enterprise Technologies, 6(8 (96), 57–64. https://doi.org/10.15587/1729-4061.2018.148776

Issue

Vol. 6 No. 8 (96) (2018): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2018 Oleksandr Lazurenko, Dmytro Shokarov, Viktoriia Chorna, Olha Melnyk, Halyna Cherkashyna, Vladyslav Volynets, Olesia Antsyferova

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