The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Jonghwa Chong - One of the best experts on this subject based on the ideXlab platform.
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IEC 61850 Standard Based MMS Communication Stack Design Using OOP
2012 26th International Conference on Advanced Information Networking and Applications Workshops, 2012Co-Authors: Jongjoo Park, Eunkyu In, Sangwoo Ahn, Cheljon Jang, Jonghwa ChongAbstract:This paper deals with the MMS communication Stack library based on IEC 61850 standard. IEC 61850 standard is communication protocol of substation automation for converting conventional copper-wired type to Ethernet based open architecture in digital method. With IEC 61850 standard, interoperability can be maximized. With IEC 61850, optimal use and prediction of troubles are done through real-time surveillance by substation system. Starting from European market, substation automation systems (Sass) based on IEC61850 are spreading trend. Trying to stay with the trend, communication Stack library is needed. IEC 61850 standard consists of object, we adopt the strategy of using object-oriented programming (OOP) based on C++ language. Therefore we can take advantages of maintenance, management, alteration and reuse. For improving power of OOP method, we adopt Design pattern, especially singleton pattern. With these two strategies, this paper layers the library into a dozen or more layer to provide developers ease of use. We simulate this library by making Microsoft Windows programs.
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AINA Workshops - IEC 61850 Standard Based MMS Communication Stack Design Using OOP
2012 26th International Conference on Advanced Information Networking and Applications Workshops, 2012Co-Authors: Jongjoo Park, Sangwoo Ahn, Cheljon Jang, Jonghwa ChongAbstract:This paper deals with the MMS communication Stack library based on IEC 61850 standard. IEC 61850 standard is communication protocol of substation automation for converting conventional copper-wired type to Ethernet based open architecture in digital method. With IEC 61850 standard, interoperability can be maximized. With IEC 61850, optimal use and prediction of troubles are done through real-time surveillance by substation system. Starting from European market, substation automation systems (Sass) based on IEC61850 are spreading trend. Trying to stay with the trend, communication Stack library is needed. IEC 61850 standard consists of object, we adopt the strategy of using object-oriented programming (OOP) based on C++ language. Therefore we can take advantages of maintenance, management, alteration and reuse. For improving power of OOP method, we adopt Design pattern, especially singleton pattern. With these two strategies, this paper layers the library into a dozen or more layer to provide developers ease of use. We simulate this library by making Microsoft Windows programs.
Maria Skyllas-kazacos - One of the best experts on this subject based on the ideXlab platform.
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Investigation of the effect of shunt current on battery efficiency and Stack temperature in vanadium redox flow battery
Journal of Power Sources, 2013Co-Authors: Ao Tang, J.f. Mccann, Jie Bao, Maria Skyllas-kazacosAbstract:Abstract In vanadium redox flow batteries (VFB), the power of the battery is determined by the number of cells in the Stack. Serial and parallel layouts are commonly adopted interactively to suit the Designed power demand. The bipolar Stack Design inevitably introduces shunt currents bypassing into the common manifolds in the Stack and thereby resulting in a parasitic loss of power and energy. During standby, shunt current and its associated internal discharge reactions can generate heat and increase Stack temperature, potentially leading to thermal precipitation in the positive half-cell. This study aims to investigate the effect of shunt current on Stack efficiency and temperature variation during standby periods for a 40-cell Stack. Dynamic models based on mass balance, energy balance and electrical circuit are developed for simulations and the results provide an insight into Stack performance that will aid in optimising Stack Design and suitable cooling strategies for the VFB.
Jongjoo Park - One of the best experts on this subject based on the ideXlab platform.
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IEC 61850 Standard Based MMS Communication Stack Design Using OOP
2012 26th International Conference on Advanced Information Networking and Applications Workshops, 2012Co-Authors: Jongjoo Park, Eunkyu In, Sangwoo Ahn, Cheljon Jang, Jonghwa ChongAbstract:This paper deals with the MMS communication Stack library based on IEC 61850 standard. IEC 61850 standard is communication protocol of substation automation for converting conventional copper-wired type to Ethernet based open architecture in digital method. With IEC 61850 standard, interoperability can be maximized. With IEC 61850, optimal use and prediction of troubles are done through real-time surveillance by substation system. Starting from European market, substation automation systems (Sass) based on IEC61850 are spreading trend. Trying to stay with the trend, communication Stack library is needed. IEC 61850 standard consists of object, we adopt the strategy of using object-oriented programming (OOP) based on C++ language. Therefore we can take advantages of maintenance, management, alteration and reuse. For improving power of OOP method, we adopt Design pattern, especially singleton pattern. With these two strategies, this paper layers the library into a dozen or more layer to provide developers ease of use. We simulate this library by making Microsoft Windows programs.
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AINA Workshops - IEC 61850 Standard Based MMS Communication Stack Design Using OOP
2012 26th International Conference on Advanced Information Networking and Applications Workshops, 2012Co-Authors: Jongjoo Park, Sangwoo Ahn, Cheljon Jang, Jonghwa ChongAbstract:This paper deals with the MMS communication Stack library based on IEC 61850 standard. IEC 61850 standard is communication protocol of substation automation for converting conventional copper-wired type to Ethernet based open architecture in digital method. With IEC 61850 standard, interoperability can be maximized. With IEC 61850, optimal use and prediction of troubles are done through real-time surveillance by substation system. Starting from European market, substation automation systems (Sass) based on IEC61850 are spreading trend. Trying to stay with the trend, communication Stack library is needed. IEC 61850 standard consists of object, we adopt the strategy of using object-oriented programming (OOP) based on C++ language. Therefore we can take advantages of maintenance, management, alteration and reuse. For improving power of OOP method, we adopt Design pattern, especially singleton pattern. With these two strategies, this paper layers the library into a dozen or more layer to provide developers ease of use. We simulate this library by making Microsoft Windows programs.
Ludger Blum - One of the best experts on this subject based on the ideXlab platform.
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Three-dimensional computational fluid dynamics modelling and experimental validation of the Julich Mark-F solid oxide fuel cell Stack
Journal of Power Sources, 2018Co-Authors: R. T. Nishida, Steven Beale, L.g.j. De Haart, Jon G. Pharoah, Ludger BlumAbstract:Abstract This work is among the first where the results of an extensive experimental research programme are compared to performance calculations of a comprehensive computational fluid dynamics model for a solid oxide fuel cell Stack. The model, which combines electrochemical reactions with momentum, heat, and mass transport, is used to obtain results for an established industrial-scale fuel cell Stack Design with complex manifolds. To validate the model, comparisons with experimentally gathered voltage and temperature data are made for the Julich Mark-F, 18-cell Stack operating in a test furnace. Good agreement is obtained between the model and experiment results for cell voltages and temperature distributions, confirming the validity of the computational methodology for Stack Design. The transient effects during ramp up of current in the experiment may explain a lower average voltage than model predictions for the power curve.
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Combined Modelling and Experimental Analysis of a Solid Oxide Fuel Cell Stack
2014Co-Authors: R. T. Nishida, Steven Beale, L.g.j. De Haart, Jon G. Pharoah, Ludger BlumAbstract:The proper distribution of reactant species and removal of excess heat and reaction products are fundamental to the success of solid oxide fuel cell (SOFC) Stack technology. Experimental advances are limited due to the time and expense of varying the parameters over a range of Designs and operating conditions. Modelling of SOFCs at the Stack scale, as opposed to at the cell scale, has generally been confined to studies of the fluid distribution, neglecting any coupled effects associated with electrochemistry and/or species transport. The present work considers results from an original computational fluid dynamics (CFD) model and compares them with experimentally gathered data obtained for the Julich Mark F Stack Design. The model couples the equations of momentum, heat and species transport with electrochemical reactions for large SOFC Stacks with internal and external manifolds, with calculations being performed in reasonably short computation times. To validate the model, comparisons with voltage and temperature data from an 18-cell Stack operating in a test furnace are made. Good agreement is obtained between the model and experiment results, confirming the validity of the methodology for Stack Design.
Masanobu Awano - One of the best experts on this subject based on the ideXlab platform.
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new Stack Design of micro tubular sofcs for portable power sources
Fuel Cells, 2008Co-Authors: Toshio Suzuki, Yoshihiro Funahashi, Toshiaki Yamaguchi, Yoshinobu Fujishiro, Masanobu AwanoAbstract:Micro-tubular solid oxide fuel cells (SOFCs) have high thermal stability and higher volumetric power density, which are considered to be ideal features for portable power sources and auxiliary power units for automobile. Here, we report a new Stack Design using anode supported micro-tubular SOFCs with 2 mm diameter using Gd doped CeO2 (GDC) electrolyte, NiO-GDC anode and (La, Sr)(Co, Fe)O3 (LSCF)-GDC cathode. The new Stack consists of three bundles with five tubular cells, sealing layers and interconnects and fuel manifolds. The performance of the Stack whose volume is 1 cm3 was shown to be 2.8 V OCV and maximum power output of 1.5 W at 500 °C, applying air only by natural convection. The results also showed strong dependence of the fuel flow rates on the Stack performance, which was correlated to the gas diffusion limitation.
