The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Zaoxiao Zhang - One of the best experts on this subject based on the ideXlab platform.
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Dynamic modeling and operation strategy of an NG-Fueled SOFC-WGS-TSA-PEMFC hybrid energy conversion system for Fuel Cell Vehicle by using MATLAB/SIMULINK
Energy, 2019Co-Authors: Peng Tan, Bin Chen, Weizi Cai, Meina Chen, Zaoxiao ZhangAbstract:Abstract Proton exchange membrane Fuel Cells (PEMFCs) are promising energy conversion devices for electrical Vehicles. A reformer is needed when natural gas is used for Fuel Cell Vehicles. The reformer can be replaced by a solid oxide Fuel Cell (SOFC) which can reform natural gas and produce power simultaneously, which in turn can enhance the energy efficiency. In this paper, an SOFC/PEMFC hybrid system is proposed and numerically studied to improve energy efficiency and dynamic response. A water gas shift and thermal swing adsorption subsystem is integrated into the hybrid system to ensure pure H2 for PEMFC. It is found that slow transient response of the SOFC dominates short-term dynamic behaviors, while fast response of the PEMFC governs mid-term dynamic behaviors. The results also show that the integrating thermal swing adsorption reactor and H2 buffer as a single H2 Fuel source for PEMFC contributes to enhanced dynamic behaviors. The hybrid system with SOFC to PEMFC power distribution of 6:4 could stabilize output power within 20 s with a high energy efficiency of over 60% when used to power a 300 kW Fuel Cell Vehicle. The proposed system is promising for electrical Vehicle applications with enhanced energy efficiency and dynamic response.
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Dynamic modeling of a NG-Fueled SOFC-PEMFC hybrid system coupled with TSA process for Fuel Cell Vehicle
Energy Procedia, 2019Co-Authors: Pengfei Zhu, Zaoxiao ZhangAbstract:Abstract Fuel Cell power technology has drawn extensive attentions due to its high efficiency, low emission and noise. Solid oxide Fuel Cell (SOFC) could generate the power by diverse Fuels, such as natural gas (NG), while proton exchange membrane Fuel Cell (PEMFC) only feeds on pure H2. More and more attentions are paid on the combination of SOFC and PEMFC for high efficiency and convenient reFueling in the practical applications. To obtain H2 Fuel with high purity from SOFC as a reformer, the gas processing subsystem for H2 separation and purification should be applied between SOFC and PEMFC. In this present study, the gas processing subsystem, consisting of water gas shift (WGS) and thermal swing adsorption (TSA), is introduced into the SOFC-PEMFC hybrid system. Then, the SOFC-WGS-TSA-PEMFC hybrid system is modelled to investigate the transient behaviors under different operations. The simulation results show that the SOFC-WGS-TSA-PEMFC hybrid system has an improved energy conversion efficiency of approximately 64%, which is higher than the only-SOFC and the reform-PEMFC. The waste heat recovery for driving the TSA reaction accounts for the higher net electricity efficiency compared with the SOFC-PEMFC hybrid system based on the pressure swing adsorption (PSA) for H2 separation. Since the SOFC and PEMFC have completely different transient responses to the change of the loading, the influences of operating conditions of Fuel Cell Vehicles on the transient behaviors of single SOFC and PEMFC and the overall performance of the SOFC-WGS-TSA-PEMFC hybrid system are further investigated. Through the analysis and discussion based on the dynamic modelling, the operation strategy is unveiled in this paper for the performance optimization of the hybrid system when installed in the Fuel Cell Vehicles.
Lei Wang - One of the best experts on this subject based on the ideXlab platform.
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asymmetrical duty cycle control and decoupled power flow design of a three port bidirectional dc dc converter for Fuel Cell Vehicle application
IEEE Transactions on Power Electronics, 2012Co-Authors: Lei Wang, Zhan Wang, Hui LiAbstract:This paper proposes a new asymmetrical duty cycle control method for a three-port bidirectional DC-DC converter with two current-fed ports interfacing with low voltage battery and ultracapacitor in a Fuel Cell Vehicle. Along with the phase shift control managing the power flow between the ports, asymmetric duty cycle is applied to each port to maintain a constant DC bus voltage at low voltage side, which as a result will achieve wide zero-voltage-switching (ZVS) range for each port under varied ultracapacitor and battery voltages. The ZVS range analysis of different duty cycle control methods as well as the circulation power loss between the ports have been analyzed. In addition, the power flow design featuring the reduced coupling factors between the ports have been developed for the three-port bidirectional DC-DC converter. A Fuel Cell Vehicle power train including a 2.5 kW three-port DC-DC converter interfacing a 12 V battery and ultracapacitor was built in the laboratory. The proposed asymmetrical duty cycle control and power flow design was implemented and verified on the hardware test bed under urban driving cycle. The experimental results validated that proposed asymmetrical duty cycle method has higher efficiency than other methods; furthermore, they also validated the reduced coupling factor between phase shift control and duty cycle control.
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Maximum Fuel Economy-Oriented Power Management Design for a Fuel Cell Vehicle Using Battery and Ultracapacitor
IEEE Transactions on Industry Applications, 2010Co-Authors: Lei WangAbstract:A single energy storage element (ESE) has been used in Fuel Cell (FC) Vehicles to improve the FC dynamic response and to recover the braking energy. An energy storage system (ESS) consisting of hybrid ESEs extends the capabilities of single ESE and is, therefore, capable of achieving an optimized performance with improved life cycles for ESS. In this paper, an FC Vehicle power train configuration is presented, where a three-port isolated triple-half-bridge dc/dc converter is applied to interface a power dense ultracapacitor (UC) and an energy dense battery unit (BU). A design routine is provided to size the BU and UC to achieve the lightest mass at a 95 % efficiency. Furthermore, a control strategy is developed to achieve the maximum Fuel economy of the FC. The state of charge of the BU and UC is also controlled in a dynamic environment and maintained after the driving cycle. Two different approaches of the proposed control strategy have been implemented. The system loss of each method has been compared. The simulation and experimental results based on simplified urban driving cycles are presented to validate the proposed maximum Fuel economy design.
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Maximum Fuel Economy-oriented Power Management Design for a Fuel Cell Vehicle Using Battery and Ultracapacitor
2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, 2009Co-Authors: Lei WangAbstract:Single energy storage element (ESE) has been used in Fuel Cell (FC) Vehicle to regulate power flow between the FC and electric drive for improved dynamic response and system efficiency. An energy storage system (ESS) consisting of hybrid ESEs extend the capabilities of single ESE by providing overall higher efficiency, lower total weight, and better performance. In this paper, a Fuel Cell Vehicle power configuration structure that does not require a dc/dc converter to interface FC with inverter DC bus is provided. A three-port isolated Triple-Half-Bridge (THB) dc/dc converter with high efficiency and high power density is applied to interface an ESS of two energy storage elements - battery unit (BU) and ultracapacitor (UC). A new routine is presented to size the BU and UC to achieve lightest mass and 95% efficiency. Furthermore, a new control strategy to achieve maximum Fuel economy and reduced size of FC is proposed. The FC provides average electric drive power during driving cycles, the BU and UC compensate for the difference between electric drive requirement and power provided by FC. The state of charge (SOC) of BU and UC are also maintained after driving cycles. Two alternatives of this control strategy have been examined to identify the different impacts of Fuel Cell ohmic polarization loss and the combined BU/UC internal loss on system efficiency. Simulation and experimental results based on simplified urban driving cycles are presented to validate the proposed maximum Fuel economy design and efficiency comparisons of two control alternatives.
Robin Roche - One of the best experts on this subject based on the ideXlab platform.
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advanced passivity based aging tolerant control for a Fuel Cell super capacitor hybrid system
Control Engineering Practice, 2020Co-Authors: Suyao Kong, Mathieu Bressel, Mickaël Hilairet, Robin RocheAbstract:Abstract This paper proposes an advanced aging-tolerant control for a Fuel Cell/super-capacitor hybrid system applied to a commercial Vehicle. The controller is designed with the Interconnection and Damping Assignment-Passivity-Based Control (IDA-PBC) method to solve the converters coordination problem, where the state-of-charge of the super-capacitors and all current limitations are considered into the non-linear controller. The aging of the Fuel Cell is estimated in real-time by an extended Kalman filter and is integrated in the controller in order to preserve the stability of the whole system. Finally, a hardware-in-the-loop platform based on an INTEL/ALTERA FPGA is designed in order to validate the real-time operation of the algorithms for a specific case study with a Fuel Cell Vehicle.
Jenn-jiang Hwang - One of the best experts on this subject based on the ideXlab platform.
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Techno-economic evaluation of a hybrid Fuel Cell Vehicle with on-board MeOH-to-H2 processor
Applied Energy, 2019Co-Authors: Bo Neng Chuang, Jenn-jiang Hwang, Chien-kung Lin, Shu Bo YangAbstract:Abstract A new on-board MeOH-to-H2 processor, which is a combination of multi-tube annular membrane methanol reformer (MTAMMR), plate-fin heat exchangers, Fuel tank, and auxiliary equipment, is installed into the hybrid Fuel Cell Vehicle named as the methanol reformer-based hybrid Fuel Cell (MRHFC) Vehicle. Compared to the high-pressure hydrogen tank in the direct hydrogen Fuel Cell (DHHFC) Vehicle, e.g. 2016 Toyota Mirai hybrid Fuel Cell Vehicle, we found that (i) the estimated size of the MeOH-to-H2 processor is smaller than that of the hydrogen tank by 46.6% if the sizes of auxiliary equipment are not taken into account, and (ii) the estimated capital cost of the stainless steel MeOH-to-H2 processor is lower than that of the hydrogen tank by 77% if the present high cost of the tubular membrane is ignored. To explore the Fuel economy of the MRHFC Vehicle with different batteries, the urban/highway driving cycles in terms of the acceleration performance and the hybrid ratio (HR) of battery power and motor peak power is investigated by an advanced Vehicle simulator (ADVISOR). The simulations show that (i) the high HR can reduce the total cost as well as increase the Fuel economy of the MRHFC Vehicle, and (ii) the Li-ion battery is better equipped to ensure the high Fuel economy and avoid the undesired state of charge (SOC) of battery while HR = 0.6.
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Sustainability study of hydrogen pathways for Fuel Cell Vehicle applications
Renewable and Sustainable Energy Reviews, 2013Co-Authors: Jenn-jiang HwangAbstract:The present work has conducted a comprehensive life-cycle analysis of energy consumption and greenhouse gas (GHG) emission for various Fuel/Vehicles systems. Focus is placed on the hydrogen-based Fuel Cell Vehicle (FCV) technology, while the gasoline Vehicle (GV) equipped with an internal combustion engine (ICE) serves as a reference technology. A Fuel-cycle model developed at Argonne National Laboratory, the GREET model, is employed to evaluate the well-to-wheels (WTW) energy and emissions impacts caused by various Fuel/Vehicle systems. Six potential hydrogen pathways using renewable and non-renewable energy sources are simulated, namely, steam reforming of natural gas and corn ethanol, water electrolysis using grid generation and solar electricity, and coal gasification with and without carbon sequestration. Results showed that the FCVs Fuelled with solar electrolysis hydrogen have the greatest benefits in energy conservation and GHG emission reduction. However, by incorporating with the economic consideration, hydrogen from the natural gas reforming is likely to be the primary mode of production for the initial introduction of FCVs.
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development of a lightweight Fuel Cell Vehicle
Journal of Power Sources, 2005Co-Authors: Jenn-jiang Hwang, Dayung Wang, N C ShihAbstract:This paper described the development of a Fuel Cell system and its integration into the lightweight Vehicle known as the Mingdao hydrogen Vehicle (MHV). The Fuel Cell system consists of a 5-kW proton exchange membrane Fuel Cell (PEMFC), a microcontroller and other supported components like a compressed hydrogen cylinder, blower, solenoid valve, pressure regulator, water pump, heat exchanger and sensors. The Fuel Cell not only propels the Vehicle but also powers the supporting components. The MHV performs satisfactorily over a hundred-kilometer drive thus validating the concept of a Fuel Cell powered zero-emission Vehicle. Measurements further show that the Fuel Cell system has an efficiency of over 30% at the power consumption for Vehicle cruise, which is higher than that of a typical internal combustion engine. Tests to improve performance such as speed enhancement, acceleration and Fuel efficiency will be conducted in the future work. Such tests will consist of hybridizing with a battery pack.
Pengfei Zhu - One of the best experts on this subject based on the ideXlab platform.
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Dynamic modeling of a NG-Fueled SOFC-PEMFC hybrid system coupled with TSA process for Fuel Cell Vehicle
Energy Procedia, 2019Co-Authors: Pengfei Zhu, Zaoxiao ZhangAbstract:Abstract Fuel Cell power technology has drawn extensive attentions due to its high efficiency, low emission and noise. Solid oxide Fuel Cell (SOFC) could generate the power by diverse Fuels, such as natural gas (NG), while proton exchange membrane Fuel Cell (PEMFC) only feeds on pure H2. More and more attentions are paid on the combination of SOFC and PEMFC for high efficiency and convenient reFueling in the practical applications. To obtain H2 Fuel with high purity from SOFC as a reformer, the gas processing subsystem for H2 separation and purification should be applied between SOFC and PEMFC. In this present study, the gas processing subsystem, consisting of water gas shift (WGS) and thermal swing adsorption (TSA), is introduced into the SOFC-PEMFC hybrid system. Then, the SOFC-WGS-TSA-PEMFC hybrid system is modelled to investigate the transient behaviors under different operations. The simulation results show that the SOFC-WGS-TSA-PEMFC hybrid system has an improved energy conversion efficiency of approximately 64%, which is higher than the only-SOFC and the reform-PEMFC. The waste heat recovery for driving the TSA reaction accounts for the higher net electricity efficiency compared with the SOFC-PEMFC hybrid system based on the pressure swing adsorption (PSA) for H2 separation. Since the SOFC and PEMFC have completely different transient responses to the change of the loading, the influences of operating conditions of Fuel Cell Vehicles on the transient behaviors of single SOFC and PEMFC and the overall performance of the SOFC-WGS-TSA-PEMFC hybrid system are further investigated. Through the analysis and discussion based on the dynamic modelling, the operation strategy is unveiled in this paper for the performance optimization of the hybrid system when installed in the Fuel Cell Vehicles.
