High power converters (MW), thyristor 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 out 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 cycloconverterprototype and confirm the theoretical study. These topologies are expected for a better matching between network and high power converters.
| Filename: | EPE Journal - 07-3-4 - 3 - Paper Richardeau |
| Filesize: | 1.16 MB |
