High current DC choppers in the metals industry

Scaini, V.; Ma, Tao

doi:10.1109/ias.2000.883194

Cited by 15 publications

(17 citation statements)

References 2 publications

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“…There have been several efforts to apply IGBT technology into high power rectifier systems [2]. A chopper rectifier which uses a combination of unregulated diode rectifiers and step-down dc/dc converter using IGBT to generate large controlled dc current has been proposed in previous literatures [3], [4]. It has been expected that a chopper rectifier system based on IGBT technology would bring the advantage of fast control dynamics and better line-side performance.…”

mentioning

confidence: 99%

“…2 is often utilized [2]. The much faster system response of IGBTs reduces the shortcircuit current excursions in the case of dc arc furnace applications [3]. The power supply system shown in Fig.…”

mentioning

confidence: 99%

“…This configuration brings the benefit of higher power factor and low harmonic generation in ac main side. Depending on the load current demand and the basic configuration of IGBT power cell, various types of connection at the input and output side of IGBT power cell are possible [3], [4]. As the current and power rating of load increases, the number of IGBT power cell connected in parallel also increases leading to a considerable rise of system cost including the output filter choke.…”

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Application of IGCT in High Power Rectifiers

Suh

Steimer

2008

2008 IEEE Industry Applications Society Annual Meeting

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This paper investigates the possibility of applying IGCT(Integrated Gate Commutated Thyristor) into high current high power rectifier systems. The optimal power converter topology that fully utilizes the functionality of IGCT is proposed. The proposed power converter consists of a front-end diode rectifier and 3-level step-down dc/dc converter. As compared to 2-level operation, half the input dc voltage and twice the effective switching frequency of 3-level operation can provide a wider operation range of continuous conduction mode resulting in a higher average output current of less ripple size than 2-level case. A laboratory proto-type of 5kA, 3.1MW rectifier has been simulated and tested to confirm the feasibility of IGCT in the proposed power converter topology. The proposed solution generates a relatively smooth output dc current with less contents of high frequency harmonics, thereby avoiding the high frequency harmonic related problems found in IGBT based high current rectifiers. IGCT would play a significant role to improve the cost-effective performance and reliability in low and medium ranged high current high power rectifier systems.

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Application of IGCT in High Power Rectifiers

Suh

Steimer

2008

2008 IEEE Industry Applications Society Annual Meeting

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“…Their applications include electrowinning, dc arc furnaces, resistive heating and plasma cutting, to name a few [1], [2]. Historically, they have been realized using regulating transformers followed by uncontrolled diode bridge rectifiers and phase-controlled SCR bridge rectifiers.…”

Section: Introductionmentioning

confidence: 99%

“…Bendre other benefits have prompted the introduction of dc choppers to be applied for these applications [2]. The power circuit schematic of such a diode bridge rectifier-dc chopper system configuration is shown in Fig.…”

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confidence: 99%

A unity power factor three phase PWM SCR rectifier for high power applications in the metal industry

Wallace¹,

Bendre²,

Nord³

et al.

Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248)

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Abstract-A new thyristor current-source rectifier that achieves unity power factor, low-current total harmonic distortion (THD), and dc-bus current and voltage control is presented. The rectifier is suitable for high-power applications such as induction heating and dc arc furnaces. It combines a traditional six-pulse thyristor bridge and a dc chopper that together solve power quality problems such as poor power factor and flicker generation. This topology achieves low input current THD and dc power control without additional power-factor-correction equipment, harmonic trap filters, use of multiple pulse rectifiers, or high--factor transformers.

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Novel DC Furnace Design for Smelting Nickel and Cobalt Bearing Concentrate from Spent Alumina Catalyst

Vries

Voermann

et al. 2013

Recycling of Metals and Engineercd Materials

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Gulf Chemical & Metallurgical Corporation operates a circular DC electric smelting furnace to treat nickel and cobalt bearing residues at its plant in Freeport, Texas. The furnace, originally built by others, has experienced problems including runouts through the hearth and the lower sidewall. Hatch has designed several improvements to the furnace to alleviate these problems:The single anode at the centre of the hearth was replaced with a patented system of twelve air-cooled copper anodes evenly spaced around the furnace lower sidewall. The DC power supply comprises two transformers and two rectifiers operating in parallel. The water-cooling system on the bottom and lower sidewall shell plates was replaced with an air-cooling system using copper cooling fins. The existing row of water-cooled copper coolers in the metal bath zone was re-designed for greater heat removal capacity and better element joint sealing, and a new row of water-cooled copper coolers was added to cool both the alumina bath and freeboard zones. The existing water-cooled metal and alumina tapblocks were also re-designed for more robust cooling. A binding system was added to provide refractory compression that reduces the risk of liquid leaks. Finally, the furnace tilting frame was relocated to the top of the furnace where it is less likely to be damaged.

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High current DC choppers in the metals industry

Cited by 15 publications

References 2 publications

Application of IGCT in High Power Rectifiers

Application of IGCT in High Power Rectifiers

A unity power factor three phase PWM SCR rectifier for high power applications in the metal industry

Novel DC Furnace Design for Smelting Nickel and Cobalt Bearing Concentrate from Spent Alumina Catalyst

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