Analysis of fast onload multitap-changing clamped-hard-switching AC stabilizers

The rate of change in classic thyristor-based onload tap-changing ac stabilizers is limited to that of the load current zero crossing (once per half cycle) due to the natural turnoff method involved. The growth of the power rate of insulated-gate bipolar transistor and other gate turnoff switches al...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2006-04, Vol.21 (2), p.852-861
Main Authors: Lopez, J.V., Rodriguez, J.C.C., Fernandez, S.M., Garcia, S.M., Garcia, M.A.P.
Format: Article
Language:English
Subjects:
AC voltage stabilizer
Applied sciences
Attenuators
Circuit synthesis
Cost analysis
Costs
Electric potential
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Harmonic analysis
Harmonics
Instability
Insulated gate bipolar transistors
Insulation
Iterative methods
onload tap-changer
Operation. Load control. Reliability
Oscillations
power conditioning
Power electronics, power supplies
Power networks and lines
power quality
Power system harmonics
Switches
Synthesis
Voltage
voltage control
Voltage fluctuations
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Summary:The rate of change in classic thyristor-based onload tap-changing ac stabilizers is limited to that of the load current zero crossing (once per half cycle) due to the natural turnoff method involved. The growth of the power rate of insulated-gate bipolar transistor and other gate turnoff switches allows exploring of stabilizers that are able to change taps several times in a half cycle of the mains wave (subcyclic commutation). This paper analyzes the best four solutions for the power circuit of this new class of tap-changers in the multitap version, developed through an iterative analysis and synthesis cost comparative method that moves the tap-changing stabilizers over to the world of low-frequency voltage harmonics, oscillations, flicker, and instability phenomena attenuators. These topologies allow changing times as low as 150 /spl mu/s by using a multicoil inductance to perform current limitation and voltage clamping tasks during the switching operation, as it shall be shown in a second paper dedicated to the synthesis and experimental aspects.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2005.859298