Change search
ReferencesLink to record
Permanent link

Direct link
Dynamic Model Predictive Control for Load Sharing in Electric Power Plants for Ships
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Marine Technology.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

The main contribution of this thesis is an investigation of model predictive control (MPC) for marine diesel electric power plants. Recommendations and new ideas for further development are emphasized. The motivation of the thesis is to develop a controller for diesel electric power plants that can control the plant in a more efficient way. This includes reducing wear and tear, fuel consumption, and emissions. However, the safety aspect is always the most important factor and must be handled with care. The case plant to be studied is a diesel electrical power plant consisting of several diesel driven generators (genset). These gensets produce electrical power to serve the electrical demands on a marine vessel. The consumers can be propulsion units, heave compensators, drilling equipment, and hotel loads. These highly dynamic consumers are large compared with the producers. This gives unwanted fluctuation of frequency. In some vessels this effect is so large that more gensets are required for transients than for peak demands. This can be avoided with better control strategies. The controller developed in this thesis adjusts the local controllers on the diesel engines. The objective is to keep the genset at a given load sharing, while keeping the frequency within rules and regulations. In addition is the plant controlled to a state where a single point failure does not lead to blackout. Blackout is prevented by calculating a failure case in addition to the normal case. The failure case may be a disconnection of the largest genset on the power bus segment. The case is calculated in the controller to make sure that if the case occurs the plant is able to handle the failure without a blackout. A normal case, where everything goes as normal, is calculated to optimize the current operation. The controller is verified by simulation done in MATLAB/Simulink. The implemented controller performs well during all of the simulated cases. However, the predictions made by the controller are in some cases conservative. This is due to the choice of the fuel rate constraints. Lastly, suggestions for how to improve the performance of the controller are included. The most important suggestions are to include a model of the turbocharger in the control plant model and to include more failure cases.

Place, publisher, year, edition, pages
Institutt for marin teknikk , 2012. , 122 p.
Keyword [no]
ntnudaim:7545, MTMART Marin teknikk, Marin kybernetikk
URN: urn:nbn:no:ntnu:diva-18749Local ID: ntnudaim:7545OAI: diva2:566241
Available from: 2012-11-08 Created: 2012-11-08

Open Access in DiVA

fulltext(2521 kB)2372 downloads
File information
File name FULLTEXT01.pdfFile size 2521 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)49 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf
attachment(52 kB)69 downloads
File information
File name ATTACHMENT01.zipFile size 52 kBChecksum SHA-512
Type attachmentMimetype application/zip

By organisation
Department of Marine Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 2372 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 395 hits
ReferencesLink to record
Permanent link

Direct link