Using the constant current ‒ constant voltage converters to effectively reduce voltage fluctuations in the power supply systems for electric arc furnaces

Turkovskyi, Volodymyr; Malinovskyi, Anton; Muzychak, Andrii; Turkovskyi, Olexandr

doi:10.15587/1729-4061.2020.219439

Cited by 1 publication

(4 citation statements)

References 30 publications

(37 reference statements)

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“…In the circuit with CSS, the change in the load from the operational short-circuit current to the nominal one is accompanied by an unacceptable value of the voltage swing in the grid -9.7 %. These data confirm the results [22] on the possibility of reducing voltage fluctuations in low-power grids by more than an order of magnitude.…”

Section: Discussion Of the Results Of The Study Of Nonlinear Asymmetric Modes Of The Arc Furnace Power Supply Circuitssupporting

confidence: 90%

“…To do this, it is necessary to determine the indicators of the effect on the grid (coefficients of negative sequence and current distortion) and the effect on the indicators of the furnace itself (useful arc power and electrical efficiency). In addition, it is expected to confirm the nonlinear load result for reducing voltage fluctuations by a factor of 10-15, obtained by the linear dynamic load [22].…”

Section: The Aim and Objectives Of Researchsupporting

confidence: 53%

“…A converter with such a characteristic «constant current -constant voltage» (CCCV), allows to schematically stabilize reactive power flows [21] and in dynamic modes to significantly reduce the short-term flicker indicator in the grid [22] with simultaneous equalization of the phase load. An estimate of the power of the equipment required for the implementation of the converter is given in [23].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Studies [22] showed that the use of a CCCV resonant converter for powering arc steel-making furnaces can reduce the rate of short-term flicker by more than 10 times. These results were obtained by the linear symmetric problem setting and it is necessary to confirm them under conditions of nonlinearity and asymmetry of the load.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Improvement of electromagnetic compatibility and efficiency of power supply circuits of electric arc furnaces in nonlinear asymmetric modes

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et al. 2021

EEJET

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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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Section: Discussion Of the Results Of The Study Of Nonlinear Asymmetric Modes Of The Arc Furnace Power Supply Circuitssupporting

confidence: 90%

Section: The Aim and Objectives Of Researchsupporting

confidence: 53%