Abstract
The paper presents a methodology for the design and tuning of real-time power and energy management systems for plug-in marine vessels. Main contributions are: (1) Method to design and tune the energy management strategy that will optimally share the load between on-board, fixed speed, diesel generator units and on-board energy storage, in such way that fuel consumption is minimized for a given expected load probability distribution (2) Method adaption for cases where the crew, for operational or safety reasons, decides to run with non-optimal number of diesel engines. (3) Outline of possible inclusion of adaptive tuning to cope with uncertain or unknown load probability distribution. The presented methodology applies to plug-in vessels where the battery storage cannot cover all energy needed for the planned trip, such that one need to combine the use of stored electrical energy from shore with the direct use of energy produced by on-board diesel generators. The proposed method uses the expected time of operation at each load level as key input for the optimization. Although getting such data upfront can be difficult, it is expected to be easier to get a good estimate of the load probability distribution rather than the exact load profile as function of time that is used by the existing methods.
Highlights
Main contributions are: (1) Method to design and tune the energy management strategy that will optimally share the load between onboard, fixed speed, diesel generator units and on-board energy storage, in such way that fuel consumption is minimized for a given expected load probability distribution (2) Method adaption for cases where the crew, for operational or safety reasons, decides to run with non-optimal number of diesel engines
All electric ships have over the last decades become more and more common, and recently it is seen that battery energy storages are installed as a supplement or replacement for the traditional onboard diesel generators [1]
This paper addresses the optimal operation of hybrid marine vessels with multiple diesel engine generators and energy storage where the use of energy charged from shore is the main motivation of having the energy storage installed
Summary
All electric ships have over the last decades become more and more common, and recently it is seen that battery energy storages are installed as a supplement or replacement for the traditional onboard diesel generators [1]. Under the assumption of no direct flow of energy from the on-board generators to the storage (only charging from shore is allowed), an optimal strategy is devised going through the following steps: Find fuel saving per unit of time, fcSP , at different specific load levels PL for all possible power splits between storage and DG units. Table 1) is illustrated, while Figure 4 shows the maximum and minimum values of at different vessel loads It is to be noted, that there will be some fuel saving no matter how the stored energy are spend as long as one does not run more engines than what is optimal in order to supply the share of the load that are not supplied from the battery. Expression (21) can be used in the same way as (12) to create a strategy for when to use shore energy in case a certain minimum number of running engines is prescribed
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