Wpływ topologii obwodu wejściowego przemiennika częstotliwości dużej mocy na parametry mocy pobieranej z sieci zasilającej

Nowadays in Industry we observe commonly implemented 6, 12, 18 pulse topologies for input units of High Power Frequency Converters. Also more and more we can meet Active Front End solutions with active rectifier unit. In this article we show diagrams of recorded input currents and input voltages flows for 6,12,18 pulse and AFE input topologies of similar nominal power frequency converters ( ca 800kW drives for water pumps). Recordings have been made in real industrial circumstances at different load steps to perform THDI distortion factor calculations. We expect, that results of these calculations will allow us to decide , what topology should be recommended for new High Power Variable Speed Drive solutions.