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Date submitted2023-03-02
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Date accepted2023-06-20
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Date published2023-07-19
Improving the efficiency of autonomous electrical complex with renewable energy sources by means of adaptive regulation of its operating modes
Renewable energy sources are gradually becoming useful in mining industry. They are actively used in remote, sparsely populated areas to power shift settlements, geological and meteorological stations, pipeline equipment, mobile cell towers, helicopter pads lighting, etc. In comparison with diesel generators, systems with renewable sources do not require fuel transportation, have short payback periods and flexible configuration for different categories of electrical loads. The main obstacles to their spread are instability of generation and high cost of produced electricity. One of the possible ways to solve these problems is to develop new technologies, increase power density of generators and energy storage systems. The other way represents energy saving and rational use of affordable resources. The new solutions for implementation of the second method are proposed in this work. The object of the study is autonomous DC electrical complex with photovoltaic and wind power sources. In such systems the generated power from renewable sources is transferred to consumers via intermediate DC bus, the voltage level of which affects the power losses in the process of power transmission. The vast majority of complexes have a problem that their DC bus voltage is constant, while the optimum voltage level with lowest losses varies depending on the generated and consumed power. Therefore, electrical complexes potentially lose a part of the transmitted energy. To avoid this, a special algorithm was added to automatically adjust DC bus voltage to optimum level according to changes in working conditions. An additional contribution to efficiency improvement can be made by dynamic change of operating frequency in power converters depending on their load. The evaluation based on results of computer simulation showed that in a complex with rated power 10 kW active power losses during its lifetime can be reduced by 2-5 %.
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Date submitted2015-08-12
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Date accepted2015-10-05
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Date published2016-04-22
Energy efficient electromechanical systems of mining andtransport machines
- Authors:
- A. E. Kozyaruk
The problems of selecting the type and the structure of mining and transport machines elec-tromechanical control system, providing energy efficiency and performance. The conclusion about the most admissibility of variable frequency drives with induction motors and power semiconduc-tor converters was made. The methods and technical means of improving the energy efficiency of asynchronous electric motors due to the choice of increased power characteristics motors, design of special motor control algorithms and applying of semiconductor converters with active rectifi-ers, providing high power factor and improving of the electricity supply quality were reviewed. To improve the operational characteristics prompted use of diagnostic systems and residual life as-sessment of electrical equipment. Implementation of designs tied to the excavator-transport sector. The schemes of the excavator power drive, mining truck and implemented complex picture at coal mine are shown.
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Date submitted2009-09-06
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Date accepted2009-11-10
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Date published2010-06-25
Diagnostic method for measurements of emission parameters of thermoemission cathodes
- Authors:
- A. S. Mustafaev
This article deals with the diagnostic method of emission parameters of thermo emission cathodes by the transverse magnetic field. The knudsen Cs-Ba-diode with the surface ionization are investigated.
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Date submitted2009-09-16
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Date accepted2009-11-17
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Date published2010-06-25
Information technology usage during linguistic competitions in technical higher school conducting
- Authors:
- E. V. Terentyeva
This article is devoted to the issue of IT technologies usage for teaching methods in humanities. The article is covering the experience of carrying out the linguistic creative contest among the students of the Mining Institute with the help of the soft «My test». Advantages and disadvantages of the mentioned programme for such kind of workshop are noted in the article. The conclusion for improving of teaching methods with the help of IT technologies is made.
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Date submitted2009-07-04
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Date accepted2009-09-12
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Date published2010-04-22
New technologies of conducting mine surveying works
- Authors:
- S. P. Smirnov
The paper presents principles for arrangement of mine surveying works. It is shown the role of new mine surveying and geodetic instruments and also new methods for application of these instruments in mineral mining.
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Date submitted2008-11-12
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Date accepted2009-01-14
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Date published2009-12-11
Electronic commerce and its influence on business
- Authors:
- N. I. Sattarova
- G. A. Prudinsky
Electronic commerce can give new possibilities to any firm in any industrial sector. It can lead to change of the existing markets: the new markets can appear, and old – to disappear. A key condition of successful introduction of electronic commerce is increase of professional qualities of employees.