A Practical Electric Arc Furnace Model For Flicker Assessment

Junior, Arnaldo José Pereira Rosentino; Gondim, Isaque N.; Macedo, José Rubens; Delaiba, Antônio Carlos

doi:10.1007/s40313-014-0153-3

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…The time-varying characteristics are modeled by utilizing the ARMA models. The inter-harmonic frequency spectrum of a real EAF recorded current waveform as the basis for a stochastic time-domain model of the EAF is offered in [16]. In [17], a time domain model of EAF is presented to investigate power quality issues.…”

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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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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Power Quality Study and Analysis of Different Arc Welding Machines

Moreira

Silva

Paredes

2018

J Control Autom Electr Syst

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Electrical welding machines are among the most pollutant loads due to their strong nonlinear behavior. As a result, utilities have established new criteria for connecting welding machines in the grid. One approach that can provide good results in this context is based on modeling this special load and performing simulation studies. In this paper, two different computational models were developed in PSCAD/EMTDC to help the connection evaluation process and power quality studies. Furthermore, instead of a conventional power quality analysis, a power theory for non-sinusoidal voltages and currents is needed to analyze three-phase welding machines. The conservative power theory (CPT) allows an advanced analysis of the load's characteristics as it decouples the power factor into different load conformity factors that are associated with specific characteristics in the load. The analysis and discussions are based on simulations and experimental measurements obtained at the terminals of two different welding machines. The results help to demonstrate the main advantage of the CPT compared to conventional approaches, which is related to its general application for single-phase and three-phase disturbing loads under non-ideal supply voltage conditions. Keywords Conservative power theory • Harmonics • Modeling • Nonlinear loads • Power quality • Welding machine 1 Introduction Welding machines are based on the Joule effect; that is, they use the heat dissipated by a current circulation so as to join two metal parts. This requires the passage of a very high current value, and for this reason, welding machines usually use a step-down transformer in order to reduce the applied voltage to very low values. These loads can be directly con-B Alexandre C. Moreira

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