Stochastic modeling of integrated power system coupled to hydrodynamics in the all-electric ship

Prempraneerach, Pradya; Kirtley, James L.; Chryssostomidis, Chryssostomos; Triantafyllou, Michael; Karniadakis, G. E.

doi:10.1109/speedham.2008.4581214

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…This is because conventional induction machines are designed to achieve their highest efficiency at the rated operating condition. Although motor design can be altered to improve efficiency, a properly selected machine will operate near its lowest loss point at rated load, and the opportunity for further improvement by adjustment is low, In the literature, these loads are part of "hotel loads" [3], "ship's service power system" [7], or "ship service distribution" [2]. Since most water and HVAC pumps utilize induction motors, loss minimization in these motors can be helpful.…”

Section: A Steady-state Applications At Rated Conditionsmentioning

confidence: 99%

“…Induction motors are common in propulsion systems; power ratings range from 10 to 25 MW (13,000 to 33,000 hp) [3]. A typical rating used in [2] and [3] is around 20 MW. A common electric propulsion system is shown in Figure 2, and shows six main parts: a fuel-driven or steamdriven turbine, a generator (GEN), electric transmission, an electronic drive, the propulsion motor (ac motor), and auxiliary loads (AUX).…”

Section: B Electric Ship Propulsionmentioning

confidence: 99%

“…Another perturbation method followed in [47] varies the rotor flux while estimating the rotor resistance online. This estimate is used in a Fibonacci search algorithm to find the optimal rotor flux in less than 1 s. 2 2…”

Section: Hybrid Techniquesmentioning

confidence: 99%

“…Of interest here are electric ship propulsion systems that utilize induction motors and consume the largest amount of power generated onboard the ship. The propulsion system constitutes 70 to 90% of the electrical load [1] and [2]. According to [3], only 10 to 20% of the electrical energy on an electric ship is consumed by loads other than the propulsion system.…”

Section: Introductionmentioning

confidence: 99%

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A survey of real-time power-loss minimizers for induction motors

Bazzi

Krein

2009

2009 IEEE Electric Ship Technologies Symposium

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This paper presents a survey of available techniques for minimizing power losses and input power of induction motors. The presented techniques serve different induction motor applications, including electric ship propulsion systems. Realtime techniques presented here are divided into three main categories: model-based methods that use the induction motor model, physics-based methods that search for the minimum power loss regardless of the motor model or parameters, and hybrid methods that combine both approaches. Definitions, comparisons, and details about these methods are presented. To compare model-based and physics-based methods in a propulsion application, simulations of a model-based technique and another physics-based technique are also presented.

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Section: A Steady-state Applications At Rated Conditionsmentioning

confidence: 99%

Section: B Electric Ship Propulsionmentioning

confidence: 99%

Section: Hybrid Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A survey of real-time power-loss minimizers for induction motors

Bazzi

Krein

2009

2009 IEEE Electric Ship Technologies Symposium

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“…The in-and-out-of-water effect and ventilation are the primary loss effects that have been considered in [12]. In [13], random waves are modeled through the one-parameter Pierson and Moskowitz seas spectrum. Then, the stochastic responses of the model are examined in the surge motion.…”

Section: Introductionmentioning

confidence: 99%

Modeling In-and-Out-of-Water Impact on All-Electric Ship Power System Considering Propeller Submergence in Waves

Nasiri

Peyghami

Parniani

et al. 2021

2021 IEEE Transportation Electrification Conference &Amp; Expo (ITEC)

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Despite the advantages of employing an electric propulsion system in All-Electric Ships (AES), additional power fluctuation sources have emerged in the ship power system as a result. Since the propellers are the primary power consumers in the AES, these fluctuations may significantly affect its power system power quality. Thus, for optimal performance of the ship power system, these fluctuations need to be rigorously investigated at the design level of vessels. Waves collision is one of the critical conditions where propellers inject power fluctuations into the ship power system. Therefore, a comprehensive model is essential to analyze the propellers inand-out-of-water effect on the ship power system thoroughly at the design level. This paper proposes a model-based approach for determining propeller immersion depth variations in collisions with different wave classes. According to this approach, the propellers thrust loss factor caused by the in-andout-of-water effect can be identified. The proposed method is then applied in an integrated AES model. This model interconnects the ship motion and power system dynamics. The in-and-out-of-water impact on the ship power system can be explored precisely in the model-based design of the vessels by utilizing the proposed model. In the end, the proposed method and the interconnected model have been used to simulate a notional ship in a wave collision condition. Simulations demonstrate that the proposed approach can accurately map the substantial impacts of the vessel-wave encountering conditions on the frequency, voltage, and generally on the power quality of the AES power system.

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Evaluation of the environmental and economic impacts of electric propulsion systems onboard ships: case study passenger vessel

Ammar

Seddiek

2021

Environ Sci Pollut Res

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The International Maritime Organization (IMO) announced that maritime transport share by 2.89% in global greenhouse gases. Electric propulsion system appears as a promising option for reducing ship emissions, especially for high-powered vessels. The aim of the current paper is to investigate the environmental and economic impact of using electric propulsion systems. Simple eco-environmental model was presented to assess the best propulsion system for passenger ships. A comparison between diesel electric (DE) and combined gas turbine electric and steam (COGES) propulsion systems is conducted. As a case study, one of the cruise ships is selected. The results showed specific environmental benefits of COGES over DE propulsion option. From the design and operational viewpoints, COGES propulsion system is more energy efficient than DE by 9.3% and 27.55%, respectively. Economically, the values of the life cycle costs are 5,013 and 6,042 $/kW for DE and COGES systems, respectively. Finally, COGES seems as a greener option with a life-cycle cost-effectiveness of 612, 1970, and 6 $/ton for NO x , SO x , and CO 2 emissions, respectively.

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Stochastic modeling of integrated power system coupled to hydrodynamics in the all-electric ship

Cited by 7 publications

References 6 publications

A survey of real-time power-loss minimizers for induction motors

A survey of real-time power-loss minimizers for induction motors

Modeling In-and-Out-of-Water Impact on All-Electric Ship Power System Considering Propeller Submergence in Waves

Evaluation of the environmental and economic impacts of electric propulsion systems onboard ships: case study passenger vessel

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