EDDA FERD Electrical solutions - SINTEF...Utilization on EDDA FERD Integrated control and monitoring Voltage setpoint Speed setpoint Energy Management (extended Power Management System)
9
Msc.EE Ketil Aagesen Siemens AS EDDA FERD Electrical solutions
* Reduced fuel consumption through variable speed propellers
Advantages
* Improved redundancy * Branch standard for the offshore fleet
* Constant speed gensets
Disadvantages
* Complex protection systems needed to maintain rendundancy * Synchronism and load sharing * Complex drives systems, reliability, losses
Development objectives;
Variable Speed
Generators Reduced Losses
Energy Storage
Clean Power
Network
Easy installation
Reduced Volume
Compact Single
unit
Closed bustie
operation
No Syncronizi
ng
Dual Thruster
Feeds
Flexible shore
connection 50/60 Hz
Presenter
Presentation Notes
In the end of 1990-ies, within the electric propulsion business, it were several problems on gensets, particularly on high speed gensets. The yellow diesel engines were also hurts, but the other colors of diesel engines as well, have had even more challenges. It look likes that the high speed engine including the base frame was not able in a long period to be loaded at rated load. Identical own frequencies created resonances, which Broken bolts on diesel engines, i.e. manifolds and flywheel housing Damaged bearings on generators Fatigue fracture on the common base frame This vibration challenges caused some modification on the generators on site. I.e. angle iron needed to be welded on the bearing flanges of the generators to move the own frequencies, to avoid resonances. In addition we had a challenge by smaller high speed gensets to stabilize the voltage out of the generators. Generators with a low moment of inertia caused this problem and gave challenges towards fluctuation of electric reactive power between the geneators. In year 2000 we started an project to investigate how we could vary the speed of the connected diesel engines according to the power or load requirements onboard. Simple adjust the speed on the diesel engine according the power requirement. As we didn`t either wait with our car at the traffic light to get green, with full throttle of the engine under the bonnet. When a ferry is connected to the landing point, why shouldn`t a solution be developed where the speed of the diesel engines where reduced, and maybe close to the idle speed. We had some show stoppers in the power electronic technology, which put this development on hold for a while challenges on high speed diesel generators Solution with variable speed diesel-generators already investigated for 10years ago but not realized due to challenges to achieve Bus-bar selectivity Why operate on rated speed at low power requirement Challenges of reactive power balance between diesel- generators due to low moment of inertia on high speed diesel engines Vibration challenges on high speed diesel generators Solution with variable speed diesel-generators already investigated for 10years ago but not realized due to challenges to achieve Bus-bar selectivity Why operate on rated speed at low power requirement
AC
AC
AC AC
DC
DC
Electrical achievement
-Variable speed in/out -Low losses -30% less volume / footprint -True redundant feeds -Clean power distribution - No syncronization
- Energy storage modules
Battery Integration – Utilization on EDDA FERD
Integrated control and monitoring
Voltage setpoint Speed setpoint
Energy Management(extended Power Management System)
rpm
P
Propulsion Control
Remote Control
Power setpoint
Modes
Uset
Powerrequest
rpm
U
Available RPM set
Limitation
Speed setpoint
Presenter
Presentation Notes
This concept has another dimension in controlling, as the we have introduced the speed of the diesel engine as a variable. We have several dynamic systems which have to be synchronized and controlled: Propulsion is influenced from the sea Speed of the propulsion motors is changing due to the requirement in thrust and waves Important to secure a stable constant power outtake from the power station The power station will reduce the speed of the diesel engines individually depending of the power required The control system need also to make sure that the power station is able to connect an larger consumer or the Energy Management system will increase the speed of the diesel engine before consumer is connected, to make sure that power is available. It`s important to handle these variables in one system
