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Title: Reactive-power compensation of coal mining excavators by using a new-generation STATCOM

Abstract

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 +/- 750-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 Standard 519-1992.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. TUBITAK Information Technology & Electronic Research Institute, Ankara (Turkey)
Publication Date:
OSTI Identifier:
20885704
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Industry Applications; Journal Volume: 43; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; EARTHMOVING EQUIPMENT; COAL MINING; BUCKET WHEEL EXCAVATORS; ELECTRIC POWER; POWER SYSTEMS

Citation Formats

Bilgin, H.F., Ermis, M., Kose, K.N., Cadirci, I., Acik, A., Demirci, T., Terciyanli, A., Kocak, C., and Yorukoglu, M. Reactive-power compensation of coal mining excavators by using a new-generation STATCOM. United States: N. p., 2007. Web. doi:10.1109/TIA.2006.887308.
Bilgin, H.F., Ermis, M., Kose, K.N., Cadirci, I., Acik, A., Demirci, T., Terciyanli, A., Kocak, C., & Yorukoglu, M. Reactive-power compensation of coal mining excavators by using a new-generation STATCOM. United States. doi:10.1109/TIA.2006.887308.
Bilgin, H.F., Ermis, M., Kose, K.N., Cadirci, I., Acik, A., Demirci, T., Terciyanli, A., Kocak, C., and Yorukoglu, M. Mon . "Reactive-power compensation of coal mining excavators by using a new-generation STATCOM". United States. doi:10.1109/TIA.2006.887308.
@article{osti_20885704,
title = {Reactive-power compensation of coal mining excavators by using a new-generation STATCOM},
author = {Bilgin, H.F. and Ermis, M. and Kose, K.N. and Cadirci, I. and Acik, A. and Demirci, T. and Terciyanli, A. and Kocak, C. and Yorukoglu, M.},
abstractNote = {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 +/- 750-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 Standard 519-1992.},
doi = {10.1109/TIA.2006.887308},
journal = {IEEE Transactions on Industry Applications},
number = 1,
volume = 43,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}
  • A three-phase insulated gate bipolar transistor (IGBT)-based static var compensator (STATCOM) is used for voltage and/or current unbalance compensation. An instantaneous power theory is adopted for real-time calculation and control. Three control schemes, current control, voltage control, and integrated control are proposed to compensate the unbalance of current, voltage, or both. The compensation results of the different control schemes in unbalance cases (load unbalance or voltage source unbalance) are compared and analyzed. The simulation and experimental results show that the control schemes can compensate the unbalance in load current or in the voltage source. Different compensation objectives can be achieved,more » i.e., balanced and unity power factor source current, balanced and regulated voltage, or both, by choosing appropriate control schemes.« less
  • The necessity to equip cable excavators with rotary buckets is substantiated. The results of graphic-analytical analysis of the rotary bucket operation are presented, and its main advantages are determined in comparison with conventional buckets in mining coal seams of complex structure.
  • The paper describes how controlled reactive power compensation can be used to damp power systems oscillations. This is of particular interest in the case of weakly coupled networks. A comparison is made between two kinds of controllable reactive power elements, namely the CSC (Controlled Series Capacitor) and the SVC (Static Var Compensator). The essential topics dealt with are efficiency in terms of damping effect'' per installed Mvar and the dependence of equipment location. Also the influence of connected loads is investigated to some extent. Basic relationships for the CSC and the SVC approaches are shown in appendices.
  • The proposed method of determining and taking into consideration the error in calculating the power losses in the power supply systems of large coal excavators makes it possible to significantly increase the accuracy in calculating the power losses.