太阳能燃气联合循环发电系统能效优化与给水控制分析
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摘要
太阳能燃气联合循环系统(ISCC)是将槽式太阳能与燃气轮机联合循环相结合,充分利用太阳能作为中低温热源,是提高太阳能发电效率,降低太阳能发电成本,并减少系统CO_2放的有效途径。太阳能能流密度低,易受气候和昼夜影响,在阴雨和夜间,太阳能集热器几乎停止工作,造成系统工作不稳定。基于以上太阳能发电系统的缺点和不足,根据最优给水比研究,采用比值控制法,使集热器给水比例匹配设计最优给水比,既满足发电系统的高效稳定运行,又达到对系统的给水调节。结果显示,采用太阳能集热器变比值给水,系统热效率、效率、太阳能净发电效率以及系统燃料基热效率稳定在0.558、0.55、0.185以及0.65;而定比值给水,随着DNI的下降,效率有所下降,下降百分比分别为:0.015、0.032、0.1以及0.038。控制系统模型在Matlab/Simulink平台上做仿真验证,通过仿真验证设计控制系统对ISCC系统集热器给水调节的准确度与可靠性。
The Integrated Solar Combined Cycle is a combination of trough collector and gas turbine combined cycle. It is an effective way to make full use of solar energy as a low-temperature heat source to improve the efficiency of solar power generation, reduce the cost of solar power generation and release the emission of CO_2. Solar energy is a kind of low flux energy which are affected by the weather and the day and night. During the rainy day and night, the solar collectors almost stopped working which result to the unstable of system. Based on the shortcomings and deficiencies of solar power system, according to the study of optimal water ratio, ratio control method was used to make the proportion of water of the solar collector in accordance with the designed optimal water ratio. Not only dose it meet the efficient and stable operation of power generation system, but also to meet the regulation of water supply of the system. The result show that the percentage of thermal efficiency,exergy efficiency, net solar power efficiency and fuel thermal efficiency of system are stabled at 55.8,55, 18.5 and 65 which adopt to the changed ratio control method. But the given ratio of water supply,with the decline of DNI, the efficiency has declined. The percentage has respectively declined 1.5,3.2, 10 and 3.8. The control system model is simulated on the platform of Matlab/Simulink and the accuracy and reliability of the design control system for the collector regulation of the ISCC system are verified through simulation.
The Integrated Solar Combined Cycle is a combination of trough collector and gas turbine combined cycle. It is an effective way to make full use of solar energy as a low-temperature heat source to improve the efficiency of solar power generation, reduce the cost of solar power generation and release the emission of CO_2. Solar energy is a kind of low flux energy which are affected by the weather and the day and night. During the rainy day and night, the solar collectors almost stopped working which result to the unstable of system. Based on the shortcomings and deficiencies of solar power system, according to the study of optimal water ratio, ratio control method was used to make the proportion of water of the solar collector in accordance with the designed optimal water ratio. Not only dose it meet the efficient and stable operation of power generation system, but also to meet the regulation of water supply of the system. The result show that the percentage of thermal efficiency,exergy efficiency, net solar power efficiency and fuel thermal efficiency of system are stabled at 55.8,55, 18.5 and 65 which adopt to the changed ratio control method. But the given ratio of water supply,with the decline of DNI, the efficiency has declined. The percentage has respectively declined 1.5,3.2, 10 and 3.8. The control system model is simulated on the platform of Matlab/Simulink and the accuracy and reliability of the design control system for the collector regulation of the ISCC system are verified through simulation.
引文
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[15]张兰婷,孙超,任绿原.双闭环流量比值控制系统的设计及仿真分析[J].数字技术与应用,2015(3):11-11ZHANG Lanting, SUN Chao, REN Lueyuan. Design And Simulation of Double Closed-loop Flow Ratio Control System[J].Numerical Control, 2015(3):11-11
[2] Hermann U, Lippke F. The Influence of Transients on the Design of DSG Solar Fields[J]. Phys IV France, 1999,9(PR3):489-500
[3] Markus Eck, Tobias Hirsch. Dynamics and Control of Parabolic Trough Collector Loops with Direct Steam Generation[J]. Solar Energy, 2007, 81(2):268-279
[4] Jessica Leo, Chady Kharrat, Alina Voda, Gildas Besancon, Frans Davelaar. Modeling and Control of a Linear Fresnel Reflector for an Integrated Solar Combined Cycle[C]//European Control Conference(ECC), Strasbourg, France, IEEE, 2014:1319-1324
[5]潘小弟,纪云锋,王桂荣.注入模式下DSG系统反馈线性化串级控制器设计[J].微计算机信息,2011, 27(1):28-30PAN Xiaodi, JI Yunfeng, WANG Guirong. Feedback Linearization Cascade Controller Design of DSG System under Injection Mode[J]. Control&Automation, 2011,27(1):28-30
[6] Yuanyuan Li, Yongping Yang. Thermodynamic Analysis of a Novel Integrated Solar Combined Cycle[J]. Applied Energy, 2014, 122(122):133-142
[7]李元媛,袁晶,杨勇平.太阳能燃气联合循环系统集成优化研究[J].工程热物理学报,2014, 35(12):2348-2352LI Yuanyuan, YUAN Jing, YANG Yongping. Optimization Study for Integrated Solar Combined Cycle System[J]. Journal of Engineering Thermophysics, 2014, 35(12):2348-2352
[8]刘文定,王东林.Matlab/Simulink与过程控制系统[M].北京:机械工业出版社,2013:169-184LIU Wending, WANG Donglin. Matlab/Simulink and Process Control System[M]. China Machine Press, 2013:169-184
[9]时广礼.给水流量控制系统仿真辅助设计[J].计算机仿真,1994(3):15-19SHI Guangli. Simulation Aid Design of Water-Feed System[J].Computer Simulation, 1994(3):15-19
[10]谢克瑞.一种模糊动态修正的双闭环比值控制在硝酸生产中的应用研究[D].重庆:重庆大学,2014XIE Kerui. Research on Double Closed-loop Ratio Control Method with Fuzzy Dynamic Correction and its Application in Nitric Acid Production[D]. Chongqing:ChongQing University, 2014
[11] Ali Yce, Nusret Tan, Derek P. Atherton. Fractional Order PI Controller Design for Time Delay Systems[J].IFACPaperOnLine, 2016, 49(10):94-99
[12]杨玉涛,张小栋.高速电磁阀模型建立及响应特性研究[J].测控技术,2008, 27(6):86-89YANG Yutao, ZHANG Xiaodong. Study on Mathematicl Modeling and Response Characteristics of High-Speed Solenoid Valve[J]. Measurement&Control Technology,2008, 27(6):86-89
[13]柏艳红,李小宁.基于比例流量阀的气动位置伺服系统的一种非线性补偿方法[J].液压与气动,2007(7):52-55BAI Yanhong, LI Xiaoning. A Nonliner Compensation Method for Pneumatic Positioning System with Proportional Flow Valve[J]. Chinese Hydraulics&Pneumatics,2007(7):52-55
[14]张玉润,祝和云.适用于低S值运行的调节阀[J].石油化工自动化,1982(4):13-27ZHANG Yurun, ZHU Heyun. A Control Valve Applied in the Operation of Low S-Value[J]. Automation in Petrochemical Industry, 1982(4):13-27
[15]张兰婷,孙超,任绿原.双闭环流量比值控制系统的设计及仿真分析[J].数字技术与应用,2015(3):11-11ZHANG Lanting, SUN Chao, REN Lueyuan. Design And Simulation of Double Closed-loop Flow Ratio Control System[J].Numerical Control, 2015(3):11-11