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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 54890 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Parniani, Mostafa; Blaabjerg, Frede
- Abstract:
- Development of the electric propulsion system and its applications in all-electric ships (AES) has made proper operating approaches for their power system more essential than ever. The proposed solutions should lower the design cost, operation cost, and greenhouse gas emission while increasing the reliability and power quality of the vessel. Because of abrupt changes in propellers consumption power, it is critical to consider the hydrodynamic phenomena and examine the propulsion system torque variations in the power management system at the design stage.In this dissertation, considering the importance of evaluating the operation methods in different operating conditions, such as sea waves or maneuvers, an integrated model is proposed that can interconnect the hydrodynamic and electrical system behavior of a vessel. Then, the mechanical fatigue imposed on the propulsion system of a vessel operating in different scenarios is studied using a novel index. An optimal power management approach to change the ship speed is presented by utilizing this index. This method is shown to impose less mechanical fatigue on the propellers. Following that, novel power management systems are provided to smooth the propellers power fluctuations in wave collisions by altering the propellers speed. In addition, according to the presented index for considering mechanical fatigue and based on the life cycle of energy storage devices, a multi-objective optimization method is developed for electric vessels. The proposed approaches are investigated using simulation validation methods, and the superiority of each method in reducing operating cost, improving power quality, and increasing equipment lifespan in all-electric ships is demonstrated. It is shown that the proposed power management system can reduce more than 80 percent of power system variations by smoothing propulsion system power fluctuations, regardless of deploying energy storage systems. Besides, the developed multi-objective optimization approach is capable of reducing the operation cost of a ship by up to 40 percent.
- Keywords:
- Energy Management System ; Demand Side Mangement ; Power Management ; Energy Management ; Electric Propulsion ; All-Electric Ships
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