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Reactive-Power Compensation of Coal Mining Excavators by Using a New-Generation STATCOM

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10 Author(s)
Bilgin, H.F. ; Electr. & Electron. Eng. Dept., Middle East Tech. Univ., Ankara ; Ermis, M. ; Kose, K.N. ; Cetin, A.
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This paper deals with the development and implementation of a current-source-converter-based static synchronous compensator (CSC-STATCOM) applied to the volt-ampere-reactive (VAR) compensation problem of coal mining excavators. It is composed of a plusmn750-kVAR full-bridge CSC with selective harmonic elimination, a low-pass input filter tuned to 200 Hz, and a Delta/Y-connected coupling transformer for connection to medium-voltage load bus. Each power semiconductor switch is composed of an asymmetrical integrated gate commutated thyristor (IGCT) connected in series with a reverse-blocking diode and switched at 500 Hz to eliminate 5th, 7th, 11th, and 13th current harmonics produced by the CSC. Operating principles, power stage, design of dc link, and input filter are also described in this paper. It has been verified by field tests that the developed STATCOM follows rapid fluctuations in nearly symmetrical lagging and leading VAR consumption of electric excavators, resulting in nearly unity power factor on monthly basis, and the harmonic current spectra in the lines of CSC-STATCOM at the point of common coupling comply with the IEEE Std. 519-1992

Published in:

Industry Applications, IEEE Transactions on  (Volume:43 ,  Issue: 1 )

Date of Publication:

Jan.-feb. 2007

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