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Summary
High power converters (MW) use thyristors arrangements in phase-controlled mode by the voltages of the power supply network. However, low-rank harmonic currents and lagging reactive power are drawn on a.c. side. In this paper, a new “dual-switching” mode with GTO switches reverse blocking abilities is studied and carried our in basic rectifier bridges and naturally commutated cycloconverter topologies. This concept allows to suppress the reactive power flow between power supply network and direct converters whatever load parameters. Global features are given with a final comparison list, especially on the following “dual-switching” topologies: full-bridges cycloconverter, mixed-bridges cycloconverter and series arrangement of full-bridges cycloconverters. Presented experimental results are based on a 20 kVA versatile cycloconverter prototype and confirm the theoretical study. These topologies are expected for a better matching between network and high power converters.
Additional information
Notes on contributors
F. Richardeau
Frédéric Richardeau Doctorate degree in Electrical Engineering from the “Institut National Polytechnique de Toulouse” in 1996. He is currently working as researcher at the CNRS and the Laboratoire d’Elcctrotechniquc et d’Electronique Industrielle (LEEI). His areas of interest arc Power Supply Network Conditioners and Fault Tolerant High Power Converters. He works also as teacher in Power Electronics at the “Ecolc Nationalc Supéricurc d’Electrotechnique, d’Electronique, d’Hydraulique el d’lnformatique de Toulouse”, e-mail: [email protected]
P.H. Ladoux
Philippe Ladoux Doctorate degree in Electrical Engineering from Institut National Polytechnique de Toulouse (France). Electrical Engineering degree from ENSEEIHT. “Maitre de conférence” reseacher in Laboratoire d’Electrotechnique et d’Electronique Industrielle in Toulouse (LEEI). His research interests are high power converters using switches in soft commutation mode. (E-Mail: [email protected])
Y. Chéron
Yvon Chéron Docteur es Sciences degree from the Institut National polyiechniquc de Toulouse. Directeur de Recherche at CNRS. Author of a book about soft commutation. (E-Mail: [email protected]