The Experts below are selected from a list of 8496 Experts worldwide ranked by ideXlab platform
Heath Hofmann - One of the best experts on this subject based on the ideXlab platform.
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control development and performance evaluation for battery flywheel hybrid energy storage solutions to mitigate load fluctuations in all electric Ship Propulsion systems
Applied Energy, 2018Co-Authors: Jun Hou, Jing Sun, Heath HofmannAbstract:Abstract Current trends in both commercial and military Ship development have focused on Ship electrification. A challenge for electric-Ship Propulsion systems, however, is large Propulsion-load fluctuations. To address this issue, this paper explores a new solution, namely a combined battery and flywheel (B/FW) hybrid energy storage system (HESS) as a buffer to isolate load fluctuations from the Shipboard network. Our two main objectives, power-fluctuation compensation and energy saving under various operating constraints, are formulated as a multi-objective optimization problem. Pareto fronts, which illustrate the trade-offs between the main objectives, are obtained by using dynamic programming with the weighted sum method. To quantitatively analyze the performance of B/FW HESS, a comparative study is performed under different sea conditions, where a battery/ultra-capacitor (B/UC) HESS configuration is used as a reference in performance evaluation. Simulation results show the feasibility and effectiveness of B/FW to mitigate the load fluctuations for all-electric Ships, especially at high sea states. Furthermore, a model predictive control (MPC) algorithm is developed to facilitate real-time implementation of the proposed solution. A performance comparison between the proposed MPC energy management strategy and the global dynamic programming is performed, and this comparison demonstrates the effectiveness of the proposed MPC strategy.
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Interaction analysis and integrated control of hybrid energy storage and generator control system for electric Ship Propulsion
Proceedings of the American Control Conference, 2015Co-Authors: Jun Hou, Jing Sun, Heath HofmannAbstract:Ship Propulsion systems experience large power and torque fluctuations on their drive shaft due to hydrodynamic interactions and wave excitation. For electric Propulsions, a hybrid energy storage system (HESS) could be an effective solution to address the negative impact of these fluctuations. However, the HESS, when introduced into the existing Shipboard electrical Propulsion system, will interact with the power generation control systems. In this paper, a model-based analysis is performed to evaluate the interactions of the multiple power sources when a hybrid energy storage system is incorporated. The study has revealed undesirable interactions when the controls are not coordinated properly, and leads to the conclusion that a system-level energy management strategy (EMS) will be needed. To evaluate the benefits of the system-level EMS, a comparative study is performed, and results show that the system-level EMS has advantages over other strategies in terms of many of the performance metrics.
Jun Hou - One of the best experts on this subject based on the ideXlab platform.
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control development and performance evaluation for battery flywheel hybrid energy storage solutions to mitigate load fluctuations in all electric Ship Propulsion systems
Applied Energy, 2018Co-Authors: Jun Hou, Jing Sun, Heath HofmannAbstract:Abstract Current trends in both commercial and military Ship development have focused on Ship electrification. A challenge for electric-Ship Propulsion systems, however, is large Propulsion-load fluctuations. To address this issue, this paper explores a new solution, namely a combined battery and flywheel (B/FW) hybrid energy storage system (HESS) as a buffer to isolate load fluctuations from the Shipboard network. Our two main objectives, power-fluctuation compensation and energy saving under various operating constraints, are formulated as a multi-objective optimization problem. Pareto fronts, which illustrate the trade-offs between the main objectives, are obtained by using dynamic programming with the weighted sum method. To quantitatively analyze the performance of B/FW HESS, a comparative study is performed under different sea conditions, where a battery/ultra-capacitor (B/UC) HESS configuration is used as a reference in performance evaluation. Simulation results show the feasibility and effectiveness of B/FW to mitigate the load fluctuations for all-electric Ships, especially at high sea states. Furthermore, a model predictive control (MPC) algorithm is developed to facilitate real-time implementation of the proposed solution. A performance comparison between the proposed MPC energy management strategy and the global dynamic programming is performed, and this comparison demonstrates the effectiveness of the proposed MPC strategy.
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Interaction analysis and integrated control of hybrid energy storage and generator control system for electric Ship Propulsion
Proceedings of the American Control Conference, 2015Co-Authors: Jun Hou, Jing Sun, Heath HofmannAbstract:Ship Propulsion systems experience large power and torque fluctuations on their drive shaft due to hydrodynamic interactions and wave excitation. For electric Propulsions, a hybrid energy storage system (HESS) could be an effective solution to address the negative impact of these fluctuations. However, the HESS, when introduced into the existing Shipboard electrical Propulsion system, will interact with the power generation control systems. In this paper, a model-based analysis is performed to evaluate the interactions of the multiple power sources when a hybrid energy storage system is incorporated. The study has revealed undesirable interactions when the controls are not coordinated properly, and leads to the conclusion that a system-level energy management strategy (EMS) will be needed. To evaluate the benefits of the system-level EMS, a comparative study is performed, and results show that the system-level EMS has advantages over other strategies in terms of many of the performance metrics.
G. Snitchler - One of the best experts on this subject based on the ideXlab platform.
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hardware in the loop investigation of rotor heating in a 5 mw hts Propulsion motor
IEEE Transactions on Applied Superconductivity, 2007Co-Authors: M Steurer, Stephen L Woodruff, T L Baldwin, H Boenig, Ferenc Bogdan, Tom Fikse, M Sloderbeck, G. SnitchlerAbstract:Of particular concern to designers of HTS machines are potential heating effects in the superconducting windings due to AC losses caused by load fluctuations encountered in real-life operating conditions. A 5 MW HTS synchronous prototype Ship Propulsion motor has been tested extensively under steady-state and dynamic load conditions in the advanced test facility of the Center for Advanced Power Systems at Florida State University. This paper presents results from two tests of rotor heating effects, one employing single frequency torque oscillations and the other more realistic load modeling of sea-states by means of hardware-in-the-loop (HIL) real-time simulations. Temperature results from 4 different torque oscillation tests and 12 different sea-state tests provide rotor-heating information, obtained from multiple temperature sensor data within the HTS rotor, and are compared with data obtained from steady-state runs.
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5 mw high temperature superconductor Ship Propulsion motor design and test results
Naval Engineers Journal, 2005Co-Authors: P W Eckels, G. SnitchlerAbstract:American Superconductor has designed, built, tested and delivered to the U.S. Navy's Office of Naval Research (ONR) a 5MW, 230-RPM, 6-pole high temperature superconductor (HTS) Ship Propulsion motor. The motor uses an air core armature winding and first generation HTS wire (BSCCO-2223) field winding. The goal of the motor development project was to validate the technologies required to design and build larger HTS Ship Propulsion motors, as well as to develop a motor production process that streamlines development time and minimizes cost. A commercial variable frequency drive is used to power the motor. The HTS field winding is cooled with G-M coolers with gaseous helium as the cooling medium in a closed cycle. The armature is cooled by MideP. The motor was delivered to the U.S. Navy in July 2003 and met or exceeded requirements in operation (up to the facility's testing limit of 2.5MW). The motor demonstrated both full torque and full speed operation in separate tests.
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The performance of a 5 MW high temperature superconductor Ship Propulsion motor
IEEE Transactions on Applied Superconductivity, 2005Co-Authors: G. Snitchler, Bruce Gamble, Sukhminderbir Singh KalsiAbstract:A 5 MW, 230 RPM, 6-pole high temperature superconductor (HTS) Ship Propulsion motor is presently under test at the Center for Advance Power Systems (CAPS). This paper provides a summary of the key design features of the motor, predicted performance, factory test results and extended test results to date at CAPS. This motor was designed and built under the U.S. Navy's Office of Naval Research (ONR) funding (Contract #N00014-02-C-0190) to address the next generation of electric Ship Propulsion systems. HTS motors are characterized by high power density, quiet operation and high efficiency. HTS air-core motors have unique electrical characteristics and therefore require dynamic testing to validate all modes of operation. The test program at CAPS is designed to address dynamic performance and simulation of this class of Propulsion motor. The motor has been operated at 5 MW load for over 3 hours at CAPS.
Rodolfo Taccani - One of the best experts on this subject based on the ideXlab platform.
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Health-Conscious Optimization of Long-Term Operation for Hybrid PEMFC Ship Propulsion Systems
'MDPI AG', 2021Co-Authors: Chiara Dall’armi, Davide Pivetta, Rodolfo TaccaniAbstract:The need to decarbonize the Shipping sector is leading to a growing interest in fuel cell-based Propulsion systems. While Polymer Electrolyte Membrane Fuel Cells (PEMFC) represent one of the most promising and mature technologies for onboard implementation, they are still prone to remarkable degradation. The same problem is also affecting Lithium-ion batteries (LIB), which are usually coupled with PEMFC in hybrid powertrains. By including the combined degradation effects in an optimization strategy, the best compromise between costs and PEMFC/LIB lifetime could be determined. However, this is still a challenging yet crucial aspect, rarely addressed in the literature and rarely yet explored. To fill this gap, a health-conscious optimization is here proposed for the long-term minimization of costs and PEMFC/LIB degradation. Results show that a holistic multi-objective optimization allows a 185% increase of PEMFC/LIB lifetime with respect to a fuel-consumption-minimization-only approach. With the progressive ageing of PEMFC/LIB, the hybrid Propulsion system modifies the energy management strategy to limit the increase of the daily operation cost. Comparing the optimization results at the beginning and the end of the plant lifetime, daily operation costs are increased by 73% and hydrogen consumption by 29%. The proposed methodology is believed to be a useful tool, able to give insights into the effective costs involved in the long-term operation of this new type of Propulsion system
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a review of waste heat recovery and organic rankine cycles orc in on off highway vehicle heavy duty diesel engine applications
Renewable & Sustainable Energy Reviews, 2017Co-Authors: Simone Lion, Constantine N Michos, Ioannis Vlaskos, Cedric Rouaud, Rodolfo TaccaniAbstract:Heavy Duty Diesel Engine (HDDE) are between the biggest contributors to CO2 emission and ambient pollution as they are the most widely used technology for commercial vehicles and Ship Propulsion applications, as well as, together with reciprocating gas engines, for small medium-size distributed stationary power generation.
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improving sustainability of maritime transport through utilization of liquefied natural gas lng for Propulsion
Energy, 2013Co-Authors: Fabio Burel, Rodolfo Taccani, Nicola ZulianiAbstract:Today, most merchant vessels use Heavy Fuel Oils (HFOs) for Ship Propulsion. These fuels are cost effective but they produce significant amounts of noxious emissions. In order to comply with International Maritime Organization (IMO) rules, Liquefied Natural Gas (LNG) is becoming an interesting option for merchant Ships. The aim of the research presented in this paper is to analyse the economic upturn that can result from the use of LNG as fuel for merchant Ships and to assess the effects of its utilization in terms of environmental impact.
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improving sustainability of maritime transport through utilization of liquefied natural gas lng for Propulsion
Energy, 2013Co-Authors: Fabio Burel, Rodolfo Taccani, Nicola ZulianiAbstract:Abstract Today, most merchant vessels use Heavy Fuel Oils (HFOs) for Ship Propulsion. These fuels are cost effective but they produce significant amounts of noxious emissions. In order to comply with International Maritime Organization (IMO) rules, Liquefied Natural Gas (LNG) is becoming an interesting option for merchant Ships. The aim of the research presented in this paper is to analyse the economic upturn that can result from the use of LNG as fuel for merchant Ships and to assess the effects of its utilization in terms of environmental impact. In the first part of the study, a statistical analysis of maritime traffic is carried out in order to identify which merchant Ship types could most benefit from using LNG as fuel for Ship Propulsion. Traffic data of world Ships related to the months of May 2008, 2009 and 2010 are analysed. Roll-on/Roll-off vessels (RoRo) and tanker Ships spend most of their sailing time in Emission Control Areas (ECA) consequently appear to be the best candidates for LNG use. In particular, the use of LNG is most profitable for tanker Ships in the range of 10,000–60,000 DWT (deadweight). In the second part of the study, operational costs and pollutant emission reduction, following LNG implementation, are calculated for a 33,000 DWT tanker Ship. Results show that LNG leads to a reduction of 35% of operational costs and 25% of CO2 emissions. The possibility of improving energy efficiency on board is analysed considering that combustion gases, produced by LNG, are cleaner, thus simplifying the introduction of exhaust gas heat recovery. Two options are considered: simple heat recovery and heat recovery to drive a turbine (ORC). The results show that it is possible to achieve a reduction in fuel consumption of up to 15%.
Jing Sun - One of the best experts on this subject based on the ideXlab platform.
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control development and performance evaluation for battery flywheel hybrid energy storage solutions to mitigate load fluctuations in all electric Ship Propulsion systems
Applied Energy, 2018Co-Authors: Jun Hou, Jing Sun, Heath HofmannAbstract:Abstract Current trends in both commercial and military Ship development have focused on Ship electrification. A challenge for electric-Ship Propulsion systems, however, is large Propulsion-load fluctuations. To address this issue, this paper explores a new solution, namely a combined battery and flywheel (B/FW) hybrid energy storage system (HESS) as a buffer to isolate load fluctuations from the Shipboard network. Our two main objectives, power-fluctuation compensation and energy saving under various operating constraints, are formulated as a multi-objective optimization problem. Pareto fronts, which illustrate the trade-offs between the main objectives, are obtained by using dynamic programming with the weighted sum method. To quantitatively analyze the performance of B/FW HESS, a comparative study is performed under different sea conditions, where a battery/ultra-capacitor (B/UC) HESS configuration is used as a reference in performance evaluation. Simulation results show the feasibility and effectiveness of B/FW to mitigate the load fluctuations for all-electric Ships, especially at high sea states. Furthermore, a model predictive control (MPC) algorithm is developed to facilitate real-time implementation of the proposed solution. A performance comparison between the proposed MPC energy management strategy and the global dynamic programming is performed, and this comparison demonstrates the effectiveness of the proposed MPC strategy.
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Interaction analysis and integrated control of hybrid energy storage and generator control system for electric Ship Propulsion
Proceedings of the American Control Conference, 2015Co-Authors: Jun Hou, Jing Sun, Heath HofmannAbstract:Ship Propulsion systems experience large power and torque fluctuations on their drive shaft due to hydrodynamic interactions and wave excitation. For electric Propulsions, a hybrid energy storage system (HESS) could be an effective solution to address the negative impact of these fluctuations. However, the HESS, when introduced into the existing Shipboard electrical Propulsion system, will interact with the power generation control systems. In this paper, a model-based analysis is performed to evaluate the interactions of the multiple power sources when a hybrid energy storage system is incorporated. The study has revealed undesirable interactions when the controls are not coordinated properly, and leads to the conclusion that a system-level energy management strategy (EMS) will be needed. To evaluate the benefits of the system-level EMS, a comparative study is performed, and results show that the system-level EMS has advantages over other strategies in terms of many of the performance metrics.