Analysis of equivalent 10-Hz voltage flicker measurement using IEC flickermeter standard

Int. Trans. Electr. Energ. Syst.

Shoulaie

2012

SUMMARY The main contribution of this paper is the study of a new feeding system for direct current (DC) electric arc furnaces. This system includes pulse‐width modulation‐alternating current (PWM‐AC) choppers along with six‐pulse diode rectifier. In contrast with traditional power supplies such as 12‐pulse thyristor‐based rectifier and 12‐pulse diode rectifier–DC chopper‐based power supplies, the proposed configuration stands out because of the reduced number of rectifier units and output reactors. Furthermore, the proposed power supply system is free of any current/power‐sharing problems, and only one proportional‐integral controller is sufficient to control the DC arc current or its power. It is shown through analysis and simulation that in comparison with traditional feeding systems, the proposed topology can lead to smaller input filter size, total unbalance and harmonic distortion reduction, and power factor improvement. Copyright © 2012 John Wiley & Sons, Ltd.

Section: Simulating a Typical DC Arc Furnace Plantmentioning

confidence: 99%

A novel feeding topology for DC electric arc furnaces utilizing PWM-AC choppers

Int. Trans. Electr. Energ. Syst.

Shoulaie

2012

“…As it is known, the IEC defines flicker in terms of the statistical indices P st and P lt . The P st represents the short‐term flicker severity index and is calculated over a 10‐min interval .…”

Section: Applying Five‐phase Transformer In DC Electric Arc Furnace Fmentioning

confidence: 99%

Power quality improvement in DC electric arc furnace plants utilizing multi-phase transformers

Int. Trans. Electr. Energ. Syst.

Shoulaie

2012

SUMMARY Conventional feeding systems for DC electric arc furnace steel making plants usually include a 12‐pulse rectifier that is fed by Δ/Δ and Δ/Y three‐phase transformers. In this paper, with the use of the PSCAD/EMTDC software (Developed by Manitoba HVDC Research Center Inc., Canada), the advantages of applying multi‐phase transformers for supplying such loads are evaluated and compared with the traditional three‐phase power supply systems. A well‐designed secondary winding for multi‐phase transformer is proposed, and then the modeling of such transformers is discussed. With some proper power quality indices applied, it is shown that utilizing multi‐phase transformers can lead to power quality improvement such as current/voltage harmonic reduction and unbalance mitigation. Copyright © 2012 John Wiley & Sons, Ltd.

“…The name of this quantity is IFL. The IFL variable is an indication of instantaneous flicker value in each moment [11][12][13][14][15]. Figure 11 shows the block diagram of the IEC flicker meter that was simulated for flicker measurements [11].…”

Section: Applying Iec Flickermeter Before and After Open-loop Compensmentioning

confidence: 99%

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

Euro. Trans. Electr. Power

Kiyoumarsi

Ataei

et al. 2010

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.