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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Malinovskyi A. A. Generalized approach to modes analysis of modern heat supply systems [Електронний ресурс] / A. A. Malinovskyi, V. H. Turkovskyi, A. Z. Muzychak, M. B. Sabat // Науковий вісник Національного гірничого університету. - 2018. - № 1. - С. 80-88. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_1_13 Purpose. Solving analysis problems and improvement of modern physically inhomogeneous heat supply and heating systems. Developing the mathematical models that are suitable for applying all the features of the theory of energy circuits. Methodology. The study was conducted through applying fundamental laws of physics, fundamental principles of the theory of energy circuits and sectoral theories of hydraulic and electrical circuits, formalized methods for analysis of utility networks, methods of mathematical modeling. Findings. Contour and nodal mathematical models were improved as an instrument of a generalized ap- proach to the modes analysis of heat supply and heating systems. It has been shown that the mathematical models can adequately reproduce modes of studied systems. The models take into account the nature of the power and features of the two forms of mechanical energy - kinetic and potential. It is important for the analysis of mine heating modes, as there are considerable differences in height and emergency modes, due to leakages of heat-transfer agent to the environment. Originality. The generalized approach complies with all the requirements by principles of the metrical and energy analogies. It allows applying previously unavailable tools for the modes analysis of heating systems, in particular, power balance. The important advantage of this approach is the observance of unified system variables, which allows describing the phenomenon in circuits of different physical nature. Practical value. The developed mathematical models provide an effective tool for analysis of the planned and existing modern heat supply systems and their optimization in terms of minimizing energy costs. | ||
| 2. |
Malinovskyi A. A. Peculiarities of the reactive power flow in the arc furnace supply circuit with improved electromagnetic compatibility [Електронний ресурс] / A. A. Malinovskyi, V. H. Turkovskyi, A. Z. Muzychak, Yu. V. Turkovskyi // Науковий вісник Національного гірничого університету. - 2019. - № 2. - С. 79-86. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2019_2_13 Purpose. To suggest applying a converter with a characteristic of "constant current - constant voltage" for supplying electrical arc furnaces. Methodology. The MatLab Simulink software with matrix formation of electromagnetic state equations was used to obtain mode parameters for the installation. The averaged mode coordinates t for a certain interval of the furnace operation were calculated by taking into account the stochastic nature of the load based on the theory of probability. Findings. It is demonstated that the use of the above converter allows choosing the required level of reactive power flow between the electric network and the furnace device and provides constant value of the reactive power flow due to maintaining steady current in operating modes. As a result, the voltage fluctuations are significantly reduced and phase loads are balanced. A possibility to maintain steady reactive power consumption in furnace operating modes and to influence the reactive power volume is shown. Originality. An approach to the dynamic compensation of the reactive power of an electric arc furnace due to the device with static parameters is found. Practical value. Applying the "constant current - constant voltage" converter allows optimizing the reactive power use and its costs and improves electromagnetic compatibility of the arc furnace. | ||
| 3. | 
Turkovskyi V. Using the constant current - constant voltage converters to effectively reduce voltage fluctuations in the power supply systems for electric arc furnaces [Електронний ресурс] / V. Turkovskyi, A. Malinovskyi, A. Muzychak, O. Turkovskyi // Восточно-Европейский журнал передовых технологий. - 2020. - № 6(8). - С. 54-63. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2020_6(8)__8 AC electric arc furnaces (EAFs) are among the most common technological units for making high-quality steel. The use of furnaces is promising in the future as the production volumes of electric steel increase. These furnaces are powerful electrical installations exposed to the dynamic, asymmetrical, and nonlinear load, which adversely affects the quality indicators of electricity supply. Typically, this negative impact is reduced by connecting EAFs to high power energy systems or, in most cases, by applying different types of static reactive power compensators. Such approaches require considerable investment in the development of the power system or in the equipment of compensatory installations whose rated capacity is several times higher than the capacity of the furnace transformer. These approaches aim to reduce the effects of negative impact. It is possible to achieve the greater effect of limiting the negative impact, at smaller investments, by using an alternative approach that aims directly at the source of the negative impact. The approach implementation implies forming an external characteristic of the EAF power supply. The characteristic should be rigid in current in the region of furnace operating modes from operational short circuit to the rated load. In the region of modes from the rated load to idling, this characteristic should be rigid in voltage. Underlying the formation of this characteristic is a resonance converter, which ensures almost a stable value of the arc current under the furnace operating modes. This study has confirmed the significant benefits of the proposed approach, which proves more effective in improving the quality of electricity in the network. This makes it possible to use EAFs in smaller power systems and ensure the development of the industry at a lower investment. | ||
| 4. |
Turkovskyi V. Improvement of electromagnetic compatibility and efficiency of power supply schemes of electric arc furnaces in nonlinear asymmetric modes [Електронний ресурс] / V. Turkovskyi, A. Malinovskyi, A. Muzychak, O. Turkovskyi // Eastern-european journal of enterprise technologies. - 2021. - № 5(8). - С. 6-16. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2021_5(8)__3 AC steel arc furnaces are the most powerful units connected to the electrical grid, the operating mode of which is dynamic, asymmetrical and non-linear. That is why these furnaces cause the entire possible range of negative effects on the quality of electricity in the grid, in particular, fluctuations, asymmetry and non-sinusoidal voltage. Known proposals for improving the electromagnetic compatibility of electric arc furnaces are mainly focused on eliminating the consequences of their negative impact on the power grid. The proposed approach and the corresponding technical solution are aimed at reducing the level of generation of a negative factor and at the same time reduce fluctuations, asymmetry and non-sinusoidal voltage. This result is obtained due to the fact that the proposed solution takes into account the peculiarities of the range of modes natural for arc furnaces. Optimal for such consumers is the use of a constant current power supply system I = const in the range of modes from operational short circuit to maximum load and the system U = const in the whole other range of modes. The implementation of such a system is carried out on the basis of a resonant converter "constant current - constant voltage". Studies have found that the use of such a power supply system, in comparison with the traditional circuit, makes it possible to reduce the non-sinusoidal voltage in a low-power grid from 3,2 % to 2,1 % and the unbalance coefficient from 3,66 to 1,35 %. Previously published data on a significant reduction in voltage fluctuations was also confirmed. The positive effect of such a system on the energy performance of the furnace itself is shown, manifested in an increase in the arc power by 12,5 %, and the electrical efficiency by 5,1 %. This improves the productivity and efficiency of electric arc furnaces. | ||
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