scholarly journals Impacts of Load Profiles on the Optimization of Power Management of a Green Building Employing Fuel Cells

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 57 ◽  
Author(s):  
Fu-Cheng Wang ◽  
Kuang-Ming Lin
Keyword(s):  
Power System ◽  
Power Management ◽  
Performance Improvement ◽  
Green Building ◽  
Model Parameters ◽  
Total System ◽  
System Safety ◽  
Hybrid Power System ◽  
System Cost ◽  
Hybrid Power

This paper discusses the performance improvement of a green building by optimization procedures and the influences of load characteristics on optimization. The green building is equipped with a self-sustained hybrid power system consisting of solar cells, wind turbines, batteries, proton exchange membrane fuel cell (PEMFC), electrolyzer, and power electronic devices. We develop a simulation model using the Matlab/SimPowerSystemTM and tune the model parameters based on experimental responses, so that we can predict and analyze system responses without conducting extensive experiments. Three performance indexes are then defined to optimize the design of the hybrid system for three typical load profiles: the household, the laboratory, and the office loads. The results indicate that the total system cost was reduced by 38.9%, 40% and 28.6% for the household, laboratory and office loads, respectively, while the system reliability was improved by 4.89%, 24.42% and 5.08%. That is, the component sizes and power management strategies could greatly improve system cost and reliability, while the performance improvement can be greatly influenced by the characteristics of the load profiles. A safety index is applied to evaluate the sustainability of the hybrid power system under extreme weather conditions. We further discuss two methods for improving the system safety: the use of sub-optimal settings or the additional chemical hydride. Adding 20 kg of NaBH4 can provide 63 kWh and increase system safety by 3.33, 2.10, and 2.90 days for the household, laboratory and office loads, respectively. In future, the proposed method can be applied to explore the potential benefits when constructing customized hybrid power systems.

scholarly journals A Small Hybrid Power System of Photovoltaic Cell and Sodium Borohydride Hydrolysis-Based Fuel Cell

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 278
Author(s):  
Mingxue Li ◽  
Huichao Deng ◽  
Yufeng Zhang ◽  
Chenjun Hou
Keyword(s):  
Fuel Cell ◽  
Power System ◽  
Power Management ◽  
Lithium Ion ◽  
Photovoltaic Cell ◽  
Power Source ◽  
Cell System ◽  
Fuel Cell System ◽  
Hybrid Power System ◽  
Hybrid Power

Although the hybrid power system that combines a photovoltaic cell and a lithium-ion battery is increasingly mature and practical, long-lifetime auxiliary power will be still needed in severe weather conditions. A small-volume hydrogen–oxygen fuel cell system based on the hydrolysis of NaBH4 is designed. The fuel cell system contains a tiny hydrogen generator, a hydrogen cleaner, and a small fuel cell stack consisting of three units in series. The relationship between the amount of catalyst and output performance is discussed. The long-time discharging results indicate that the fuel cell system has high power capacity. The compact design allows the fuel cell system to integrate the structure with a photovoltaic cell and lithium-ion cell and forms a hybrid power system with a small package. The power management circuit for these power sources without logic devices is designed and tested. The control strategy selects the photovoltaic–battery subsystem as the primary power source, and the fuel cell subsystem works as the backup power source to handle the circumstance when the energy stored in the battery is exhausted. The test results show that the power management system could switch the power supply automatically and timely under various emergency conditions, and the output voltage remains stable all the time.

Study on SOFC-IGCC Hybrid Power System With High Efficiency

2007 ◽  
Author(s):  
Liqiang Duan ◽  
Yongping Yang ◽  
Ershu Xu
Keyword(s):  
Power Generation ◽  
Power System ◽  
Hybrid System ◽  
System Performance ◽  
High Efficiency ◽  
Thermal Power ◽  
Combined Cycle ◽  
Total System ◽  
Hybrid Power System ◽  
Hybrid Power

Due to its high efficiency and good environmental performance, solid oxide fuel cell (SOFC) system is very attractive for future power generation, especially integrated with the conventional power generation system. However, how to effectively integrate SOFC with the conventional thermal power system and build the hybrid system with high efficiency is still a research focus. This paper studies a novel SOFC-IGCC (integrated gasification combined cycle) hybrid power system with high efficiency. On the base of the integration idea of total energy system, a novel SOFC-IGCC hybrid power system is proposed in this paper. The energy conversion mechanism of SOFC from chemical energy to electrical energy is analyzed. The maximum potential of improving the total system performance is also analyzed. The system characteristics of the hybrid system have been studied. The optimal rules of main parameters of hybrid system are revealed. The research results obtained in this paper show that integration with SOFC system will result in a significant performance improve of the total hybrid system. The integration degree of SOFC with IGCC greatly influences the system performance of the hybrid system. Compared with the base IGCC system (the system thermal efficiency is 46%), the efficiency of SOFC-IGCC hybrid system is greatly improved and increased to approximately 52%. The achievements acquired results from this paper will provide a feasible way to develop hybrid power system and valuable information for further study on IGCC system with high efficiency.

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