It is state of the art that these generators are driven by a diesel engine at constant speed and are selected according to the expected maximal power needed. These systems have a low efficiency and consequently high fuel consumption particularly when driven at small loads. The system can yield a higher efficiency for partial load conditions by reducing the rotary speed of the driving diesel engine.
At the Karlsruhe Institute of Technology (KIT) a diesel electric drive train has been mounted on a test rig consisting of a diesel engine, a permanent magnet synchronous generator, a frequency converter and an electric load. Relevant load profiles where chosen which represent typical duty cycles in stationary and mobile applications.
The consumption of the variable speed generator was measured and compared with the one of a constant speed generator. The tests revealed fuel savings of about 30 % for all of the relevant load profiles compared to a constant speed generator. Further fuel saving potential was achieved with a start/stop-function which stops the diesel engine after a determined time period when no power is needed in order to avoid idle operation periods.
Project Operation:
Heinzmann GmbH & Co. KG
Am Haselbach 1
79677 Schönau
Telefon 07673|82080
r.zahoransky@heinzmann.de
Project Partner:
Karlsruher Institut für Technologie (KIT)
Lehrstuhl für Mobile Arbeitsmaschinen
Rintheimer Querallee 2
76131 Karlsruhe
Telefon 0721|60848649
peter.dengler@kit.edu
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