Year-end Sale % OFF 
Abstract
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
Highlights
AC electric arc furnaces (EAF) are special consumers of electricity that negatively affect the quality of electricity in the grid, thereby creating problems for other electricity receivers
Considering that powerful technological units have high efficiency, one can expect a further increase in the unit capacity of the furnaces, which may exceed the current maximum of 300 MVA
The development of the electric steel market does not provide for a decrease in the load on the power grid
Summary
AC electric arc furnaces (EAF) are special consumers of electricity that negatively affect the quality of electricity in the grid, thereby creating problems for other electricity receivers. Metallurgical enterprises solve these problems by installing devices that improve the quality of electricity in the power grid. Their cost is comparable to the cost of the main technological electrical equipment, which leads to a deterioration in the economic performance of enterprises. Used measures to reduce the negative impact of electric arc furnaces on the power supply grid are aimed, as a rule, at eliminating the consequences of the negative impact of furnaces by increasing the power of the power system or using means of dynamic compensation of reactive power. The relevance of the topic and the development lies in the fact that the «constant current – constant voltage» converter (CC-CVC) for powering the EAF makes it possible to significantly reduce the negative electromagnetic effect on the power grid, and to simultaneously improve the energy performance of steel smelting
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Eastern-European Journal of Enterprise Technologies
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
