Optimal control of static VAr compensators in power supply systems with electrical arc furnaces

Prinz, S.; Pietzsch, H.; Stade, D.

doi:10.1109/epe.2005.219506

Cited by 11 publications

(4 citation statements)

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“…Because the positive reactive power at PCC means that TCR absorbs greater reactive power than the essential value, therefore, the firing angle should be increased [13], [15]. Equations (4) and 5…”

Section: Closed Loop Control Of the Tcr/fc Compensator Using Voltage mentioning

confidence: 99%

“…An improved measuring procedure was suggested to enhance TCR performance that achieves faster compensation than traditional methods. In 2003, A. Hernandez et al [3] evaluated flicker magnitudes of rapidly varying loads by means of a new frequency domain method and analytical expressions of the instantaneous flicker sensation were obtained in terms of inter-harmonic voltages and in 2005, S. Prins et al [4] presented a solution in order to obtain an optimum flicker reduction at a comparatively low capacity compensator power rating by an anti-windup extension of the controller. In this paper in order to use the measured arc voltages and currents-to describe the arc electrical behavior-a practical model of EAF based on random variables is proposed.…”

Section: Introductionmentioning

confidence: 99%

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Electric Arc Furnace Voltage Flicker Mitigation by Applying a Predictive Method with Closed Loop Control of the TCR/FC Compensator

Kiyoumarsi¹,

Ataei²,

Hooshmand³

et al. 2010

Journal of Electrical Engineering and Technology

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Modeling of the three phase electric arc furnace and its voltage flicker mitigation are the purposes of this paper. For modeling of the electric arc furnace, at first, the arc is modeled by using current-voltage characteristic of a real arc. Then, the arc random characteristic has been taken into account by modulating the ac voltage via a band limited white noise. The electric arc furnace compensation with static VAr compensator, Thyristor Controlled Reactor combined with a Fixed Capacitor bank (TCR/FC), is discussed for closed loop control of the compensator. Instantaneous flicker sensation curves, before and after accomplishing compensation, are measured based on IEC standard. A new method for controlling TCR/FC compensator is proposed. This method is based on applying a predictive approach with closed loop control of the TCR/FC. In this method, by using the previous samples of the load reactive power, the future values of the load reactive power are predicted in order to consider the time delay in the compensator control. Also, in closed loop control, two different approaches are considered. The former is based on voltage regulation at the point of common coupling (PCC) and the later is based on enhancement of power factor at PCC. Finally, in order to show the effectiveness of the proposed methodology, the simulation results are provided.

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Section: Closed Loop Control Of the Tcr/fc Compensator Using Voltage mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electric Arc Furnace Voltage Flicker Mitigation by Applying a Predictive Method with Closed Loop Control of the TCR/FC Compensator

Kiyoumarsi¹,

Ataei²,

Hooshmand³

et al. 2010

Journal of Electrical Engineering and Technology

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show abstract

“…On the other hand, a solution of obtaining an optimum flicker reduction at a comparatively low compensator power rating by an anti-windup extension of the controller is presented in Reference [2]. The dimensioning of a SVC for a steel plant grid with several operating EAF, taking the economic dimensioning of the compensator into account, is also demonstrated in this paper.…”

Section: Introductionmentioning

confidence: 96%

Reactive power compensation in a steel industrial plant with several operating electric arc furnaces utilizing open-loop controlled TCR/FC compensators

Kolagar

Kiyoumarsi

Ataei

et al. 2010

Euro. Trans. Electr. Power

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Electric arc furnaces (EAFs) produce voltage fluctuations and flicker because of the reactive power severe variations. Furthermore, these loads absorb a large amount of reactive power. The static VAr compensators (SVCs) have been widely used by the industrial customers with arc furnaces to compensate the reactive power due to the quick response of the power electronic devices. In this paper, reactive power compensation in the steel industrial plant with several EAFs by utilizing open-loop controlled thyristor controlled reactor/fixed capacitor (TCR/FC) compensator is performed. The TCR/ FC compensator is usually applied in conventional steel making plants; one is in Mobarakeh/ Isfahan, Iran which is considered as the case study in this paper. Simulation results show that, although open-loop controlled TCR/FC is effective for compensating reactive power, it cannot efficiently compensate the fluctuations of the reactive power and reduce the flicker intensity. Figure 10. RMS voltages at PCC from t ¼ 0.2 second to t ¼ 0.28 second.

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“…An improved measuring procedure was suggested to enhance TCR performance that it achieves faster compensation more than traditional methods [2]. In 2003, A. Hernandez et al evaluated flicker magnitudes of rapidly varying loads by means of a new frequency domain method and analytical expressions of the instantaneous flicker sensation were obtained in terms of interharmonic voltages [3] and in 2005, S. Prins et al presented a solution for how to obtain an optimum flicker reduction at a comparatively low capacity compensator power rating by an anti-windup extension of the controller [4]. In this paper by using the measured arc voltage and currents-to describe the arc electrical behavior-and by applying software, a practical model of EAF based on random variables is proposed.…”

Section: Introductionmentioning

confidence: 99%

Voltage flicker severity improvement in a power distribution system including electric arc furnaces

Azimi

Kolagar

Kiyoumarsi

et al. 2013

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013)

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Modelling of the three phase electric arc furnace and its voltage flicker mitigation is the purpose of this paper. The arc furnace model is implemented referring to an actual electric plant installed in Mobarakeh, Isfahan, Iran. For modelling of the electric arc furnace, at first, the arc is modeled using current-voltage characteristics of a real arc, i.e., the arc current samples as inputs and their corresponding voltages as outputs in the equivalent circuit of the furnace and its supply system. Then, the arc random characteristic has been taken into account by modulating the ac voltage by a band limited white noise. Electric arc furnace compensation with static VAr compensator, Thyristor controlled reactor combined with a fixed capacitor bank (TCR/FC), is discussed for closed loop control of the compensator. Instantaneous flicker sensation curves, before and after accomplishing compensation, are measured based on IEC standard. In closed loop control, two different approaches are considered; the former is based on voltage regulation at the point of common coupling (PCC) and the later is based on enhancement of power factor at PCC. A new method for controlling TCR/FC compensator is proposed. This method is based on applying a predictive method with closed loop control of the TCR/FC. In this method, by using the previous samples of the load reactive power, the future values of the load reactive power are predicted in order to consider the time delay in compensator control. I.

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Optimal control of static VAr compensators in power supply systems with electrical arc furnaces

Cited by 11 publications

References 0 publications

Electric Arc Furnace Voltage Flicker Mitigation by Applying a Predictive Method with Closed Loop Control of the TCR/FC Compensator

Electric Arc Furnace Voltage Flicker Mitigation by Applying a Predictive Method with Closed Loop Control of the TCR/FC Compensator

Reactive power compensation in a steel industrial plant with several operating electric arc furnaces utilizing open-loop controlled TCR/FC compensators

Voltage flicker severity improvement in a power distribution system including electric arc furnaces

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