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dc.contributor.advisorUndeland, Tore Marvinnb_NO
dc.contributor.authorOpdahl, Aleksandernb_NO
dc.date.accessioned2014-12-19T13:53:58Z
dc.date.available2014-12-19T13:53:58Z
dc.date.created2013-08-29nb_NO
dc.date.issued2013nb_NO
dc.identifier644239nb_NO
dc.identifierntnudaim:10035nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/257477
dc.description.abstractToday most of the diesel-electric systems on board ships are based on an AC-distribution of the generated power. The electric power is fed directly from the synchronous generators into an AC-grid, where it is distributed to the different loads on board. This system requires a constant rotational speed to provide the grid with the rated frequency.By introducing a DC-grid, the system no longer has to depend on constant speed. This opens the possibility to vary the speed during operations and thereby optimize the fuel-efficiency of the prime mover to the load-situation. This thesis has investigated the fuel savings by replacing traditional AC-distribution systems on board ships with DC-distribution systems.The DC-distribution systems that have been considered is a DC-grid supplied by three-phase, full-bridge diode rectifiers, and a DC-grid supplied by active front-end (AFE) IGBT based rectifiers.The thesis has concluded that vessels which experience frequent low load situations will benefit from introducing an AFE based DC-distribution system on board. The thesis has also drawn the conclusion that vessels which mostly experience high load situations, the extra cost of investing in AFE-rectifiers cannot be justified, as the fuel savings will be virtually zero at high loads. For these vessels it will be expedient to replace the AC-distribution with the less expensive diode based DC-distribution system.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for elkraftteknikknb_NO
dc.titleFuel Savings Obtained by Replacing Traditional AC-distribution Systems onboard Vessels with DC-distribution Systemsnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber62nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for elkraftteknikknb_NO


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