摘要
以220kW的SOFC/MGT混合发电系统为研究对象,建立了相应的数学模型,分析了不同控制模式对混合发电系统变工况性能的影响.结果表明:对于220kW的SOFC/MGT混合发电系统,在单独SOFC燃料控制模式(Case 1)下,系统的稳定负荷必须大于70%;在变转速控制模式(Case 2)下,系统的稳定负荷必须大于77%;而在定转速恒定电池温度的控制模式(Case3)下,系统最低负荷可以低到59%.在相同负荷条件下,Case 2对应的系统效率最高,Case 1对应的系统效率最低.为保证混合发电系统的高效率,并扩大混合发电系统的运行范围,提出了一种新的控制模式,可以使得混合发电系统最低负荷达到45%,而系统效率始终保持在56.4%以上.
Based on the 220 kW solid oxide fuel cell / micro gas turbine （SOFC/MGT） hybrid power system existing, the relevant mathematical models were established and the study of control modes on part-load performance of hybrid power system was carried out. The simulation results indicate that the 220 kW SOFC/MGT hybrid power system adjustable range must be more than 70~ of the design output power for the SOFC fuel only control mode （Case 1）, and more than 77~/6o of the design output power for the variable rotational speed control mode （Case 2）, and more than 59o/6o of the design output power for the constant rotational speed and SOFC temperature control mode （Case 3）. There is the highest efficiency for Case 2, but the lowest one for Case 1 at the same load. To extend the hybrid power system operation range and ensure the system efficiency and safety, a new control mode is proposed in which the hybrid power system may operate at lowest load of 45% of design output power and keep efficiency at above 56.4%.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2013年第5期653-658,共6页
Journal of Dalian University of Technology
基金
辽宁省自然科学基金资助项目(20092155)
关键词
SOFC
MGT混合发电系统
控制模式
变工况性能
运行范围
系统效率
solid oxide fuel cell / micro gas turbine （SOFC/MGT） hybrid power system
controlmode
part-load performance
operation range
system efficiency
