Multicell High-Current Rectifier

Wiechmann, Eduardo P.; Aqueveque, Pablo; Morales, Anibal S.; Acuna, Pablo; Burgos, Rolando

doi:10.1109/tia.2007.912728

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…The MLCR losses may thus be compared for the reactive power rating of 80 MVAr using: The revised efficiency, given in Figure 10.45, shows that during normal operation the losses are 3.8% (almost three times those of Table 10.4), and the equivalent efficiency is 96.2%. Figure 10.46 shows an IGCT-based rectifier configuration proposed for the copper electrowinning and electro-refining metallurgical processes with current ratings of up to 40 kA [12]. It consists of 24 parallel cells with independent PWM-controlled current-source rectifier modules.…”

Section: Efficiencymentioning

confidence: 99%

Low Voltage High DC Current AC–DC Conversion

Arrillaga

Liu

Watson

et al. 2009

Self‐Commutating Converters for High Power Applications

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Smelting requires extremely large DC currents, often in excess of 320 kA, to facilitate the production of commercial quantities of aluminium using the reduction process. The DC load consists of one or more potlines, which in turn are made up of many series-connected reduction cells, often in groups of 250 or more. Each cell has a nominal operating voltage which is controlled to around 4.0-4.5 V. The reduction cell is constructed with a movable carbon anode, electrolyte, aluminium cathode, cathode carbon and steel collector as shown in Figure 10.2. Figure 10.2 Simplified schematic of an aluminium reduction cell.

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Section: Efficiencymentioning

confidence: 99%

Low Voltage High DC Current AC–DC Conversion

Arrillaga

Liu

Watson

et al. 2009

Self‐Commutating Converters for High Power Applications

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“…Specifically, combining a "power cell" with reduced losses and the use of twin power transformers for improved reliability should produce a better solution. This approach is currently under development by the authors [12].…”

Section: F Economic Evaluation and Reliabilitymentioning

confidence: 99%

On the Efficiency and Reliability of High-Current Rectifiers

Aqueveque

Wiechmann

Burgos

2006

Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting

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Industrial electrolytic rectifiers work with high currents (in the order of kilo Amps) and very low dc voltage levels (few hundred Volts). The preferred industrial solutions for this type of application are thyristor-based double-bridge and fourstar multi-pulse rectifiers. A number of alternative more advanced rectifiers have been recently proposed presenting improved electrical properties, such as reduced harmonic distortion and reduced reactive power consumption. The various tradeoffs existent between these topologies have been evaluated only partially. This paper presents a full evaluation method based on standards. It should become a valuable tool for the plant design engineer offering quantitative figures to support the electrical project. The proposed method is based on the reliability, electrical performance, efficiency and required equipment investment for these rectifiers. The IEEE Standards 493-1997 and IEEE C57.18.10 for reliability and efficiency are the basis of this method, being used specifically to configure the evaluation platform. Complete results are presented for the conventional double-bridge and four-star rectifiers, and for, "late harvest" rectifier topologies including the chopper-rectifier, the sequential rectifier, and the filterless rectifier. From these, it is concluded that the modular multi-cell technology used in the chopper highcurrent rectifier is capable to challenge thyristor-based industrial solutions.

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“…1a). This compensation scheme presents a number of drawbacks, such as high-rating power of passive filter components, possibility of power distribution system resonances and requisite large physical space to install the filters (5000 ft 2 ) [4].…”

Section: Introductionmentioning

confidence: 99%

“…Alternative pulse-width-modulated (PWM) rectifier configurations aimed at improving the electrical performance of long-used thyristor-based configurations have been reported in the literature [4,5]. An extensive evaluation of the operation, configuration and electric properties of thyristor and PWM rectifiers is presented in [6], concluding that in the future PWM rectifiers will become a very attractive alternative to replace thyristor rectifiers.…”

Section: Introductionmentioning

confidence: 99%

Current harmonics compensation for electrolytic processes using a series active scheme

Acuna

Morán

Dixon

2012

IET Power Electron.

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A series active filter to compensate current harmonics injected by high-power rectifiers [such as in copper electrowinning (EW) and electro-refining (ER) processes] is presented and analysed. The proposed current harmonic compensation method is accomplished by injecting a corresponding series voltage distortion at the rectifier ac terminals. The distorted ac voltage generated at the high-power rectifier ac terminal forces the line current to be sinusoidal and increases dc voltage distortion, but it does not affect the EW or ER processes. A complete design procedure for the series active system is presented. In conjunction with simulated results obtained from a 10 MVA copper EW facility, a 2 kVA laboratory prototype is used to validate the current harmonic compensator scheme. The results obtained through simulation and from the experimental prototype confirm the viability of the proposed compensator and associated control strategy.

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Multicell High-Current Rectifier

Cited by 17 publications

References 13 publications

Low Voltage High DC Current AC–DC Conversion

Low Voltage High DC Current AC–DC Conversion

On the Efficiency and Reliability of High-Current Rectifiers

Current harmonics compensation for electrolytic processes using a series active scheme

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