Time‐varying frequency model for electric arc furnaces

Samet, Haidar; Sadeghi, Reza; Ghanbari, Teymoor

doi:10.1049/gtd2.12355

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…In [28], a technique for simulating the AC system's dynamic voltage-current properties is suggested which is based on the discrete wavelet transform (DWT) and ANN. In [29], the fundamental and harmonic currents are represented by seven parallel current sources. The phase and magnitude of the current sources are all considered to be updated every 10 ms. A technique that estimates power system harmonics and inter harmonics of the EAF has been proposed in [30], based on spectral model optimization.…”

Section: ) Frequency Domain Modelsmentioning

confidence: 99%

Optimized time varying parameters of the power balance equation model for electric arc furnaces

Babaei,

Samet

2024

IET Generation Trans & Dist

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An accurate model of electric arc furnaces (EAFs) is required to analyse their impact on the system's power quality. One of the well‐known approaches to model EAF is using the power balance equation. This model has two terms, each one has a coefficient named the model parameter. Also, both terms are powered to values, which are called model orders. So, the model includes two model parameters and two model orders. Model orders highly affect the modelling precision. The optimum model orders have not been obtained yet in previous studies. Here, based on many actual records from EAFs, the best model orders for refining, melting, and scrapping stages are attained. Unlike the original power balance equation which has constant model parameters, the first proposed model uses the attained optimal model orders with the time‐varying model parameters. In the second proposed model, the model orders are also considered time‐varying. Model parameters, which are updated every 10 ms, are obtained using autoregressive moving average (ARMA) models. The correctness of the models is assessed by calculating some important electric quantities using the actual data and the proposed models. Finally, the time‐varying parameters are generated using two MATLAB codes.

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Section: ) Frequency Domain Modelsmentioning

confidence: 99%

Optimized time varying parameters of the power balance equation model for electric arc furnaces

Babaei,

Samet

2024

IET Generation Trans & Dist

Self Cite

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“…In frequency‐domain models, EAF quantities such as voltage and current are represented by some harmonic sources. In [22], a model for the EAF is presented which includes seven parallel current sources that stand for the fundamental and harmonic currents. The magnitude and phase of the fundamental frequency and harmonics are changing every half cycle.…”

Section: Introductionmentioning

confidence: 99%

Enhanced models with time‐series coefficients used for electric arc furnace

Babaei

Samet

Jalil

2023

IET Generation Trans & Dist

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Electric arc furnace (EAF) is one of the most disturbing loads in the power system as it is highly time-varying and nonlinear. In this paper, new models based on the instantaneous EAF voltage and current, recorded from EAFs in Mobarakeh steel company in Isfahan/Iran are proposed. The focus of this paper is on developing efficient models based on the Schwarz model where three modified types are proposed. The original Schwarz model has four constant parameters. Unlike the original Schwarz model which uses invariant parameters, the time-varying nature of the arc's parameters is considered in the proposed models. The first modified model has two constant model orders and two time-varying coefficients. Additionally, to further enhance the model's accuracy, in the second modified model, six parameters include three constant model orders, and three time-varying coefficients exist. The third model uses all the original model's parameters as time-series parameters. The parameters of the time-varying model are derived using autoregressive moving average (ARMA) models. The accuracy of the proposed model is evaluated by calculating the active power, harmonics, instantaneous flicker, and short-term flicker. Finally, three MATLAB codes are provided to generate the model parameters time series.

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“…This topic is still valid and new directions are constantly being set in the modeling of electric arc furnaces [9,10]. The accurate modeling of the electric arc furnace is necessary to study its impact on power systems [11][12][13][14][15]. It is necessary to know the energy consumed within the individual steps of the arc furnace operation [16,17].…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of a Bifilar Short Electric Network for a Submerged Arc Furnace with Delta-Connected Electrodes

Baron,

Kraszewski,

Kusiak

et al. 2023

Energies

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In this paper, a non-linear programming method allowing for the optimization of the structure of high-current circuits that supply resistance-arc furnaces was presented. In the case of resistance-arc furnaces, two types of asymmetries most often occur: structural and operational ones. The structural asymmetry is related to the construction of a bifilar high-current busduct, which leads to the so-called short network. Knowing the parameters of the high-current busduct allows one to determine the operating characteristics of the arc furnace. It is also necessary to know the energy consumed in individual steps of the arc furnace operation. The method proposed in this paper makes it possible to establish guidelines for the modernization of a short network in order to eliminate asymmetry. The presented method was verified on a real object by conducting experimental tests on a furnace with a power of 12 MVA. Experimental tests were first carried out for a furnace with asymmetry, and then, by conducting simulation tests, guidelines for changing the design of the short network were determined. The measurements carried out after the modernization of the short network confirmed that the furnace was in a symmetrical operating condition and confirmed the correctness of the calculation method proposed in this paper.

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Time‐varying frequency model for electric arc furnaces

Cited by 6 publications

References 35 publications

Optimized time varying parameters of the power balance equation model for electric arc furnaces

Optimized time varying parameters of the power balance equation model for electric arc furnaces

Enhanced models with time‐series coefficients used for electric arc furnace

The Synthesis of a Bifilar Short Electric Network for a Submerged Arc Furnace with Delta-Connected Electrodes

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