This report reviews the technical complications associated with engineering and operation of Diesel electric ship propulsion.
The report has focus on losses in diesel electric propulsion, and therefore starts with a historical review of developments in the field.
This review outlines the problems with losses that are related to the different energy transforming processes that are an inevitable part of this propulsion system.
The purpose of this is to show that although progress has been rapid in this area and new technology is implemented, the losses are still relatively large and must be taken into account during the deliberations made during the design of the system.
This leads to an explanation of the decision-making process in the company Esvagt a/s to achieve their goal to build diesel-electric ships this is based on an interview with Fleet Group Manager in Esvagt, Bjørn Viig.
There is now inserted a theoretical part undergoing construction of the VFD , which is a central part of a diesel electric plant this is followed by a theoretical part about the losses that arise in this type of plant.
The theoretical part undergoing the losses is one of the key parts of the report as it will be vital to understand the impact that the losses have on the involved parts of the process to be able to understand the report conclusions.
The central part of the report is technical analyses on the Esvagt Cassiopeia in operation. Various relevant measurements are taken on the diesel electric plant at 5 representative loads on the ships propulsion system.
These measurements are subsequently used as a tool to construct the ship's operating profile as an ERRV this profile is also based on the captain's long experience as a skipper in the company.
The analysing results and operational profile is evaluated by Siemens Marine and Stadt, and the assessment from those two companies form the base that will lead to a result in choosing an alternative solution for a diesel electric plant.
The conclusion is that both companies will be able to provide solutions with significant loss savings, but a really clear choice between the two companies' systems is not possible because the available information is insufficient.
It is also concluded that preliminary work towards the establishment of the ship's operating profile is extremely important, to secure a correct engineering of the system and following the right composition of components.