光伏-塔式光热SCO_(2)混合发电系统优化配置  

Optimal Configuration of Photovoltaic-Tower SCO_(2) Hybrid Power Generation System

作　　者：宫啸宇 范刚 张嘉耕 王宇兴 戴义平[1] GONG Xiaoyu;FAN Gang;ZHANG Jiageng;WANG Yuxing;DAI Yiping(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2024年第8期80-91,共12页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51976145)。

摘　　要：针对现阶段光热发电系统成本较高和光伏发电功率波动性大的问题,提出了光伏-塔式光热超临界二氧化碳布雷顿循环(SCO_(2))混合发电系统,研究了系统关键配置参数对经济性-环保性的影响规律,基于不同负荷类型对系统参数配置进行了多目标优化,探索了不同应用场景下混合发电系统的运行特性。仿真结果表明:光伏-塔式光热SCO_(2)混合发电系统中,光热发电比例升高时,系统经济性下降,但环保性能改善;增大混合发电系统总额定功率可降低系统平准化度电成本;当太阳倍数为4、储热时长为18 h情况下,平准化度电成本存在最低值为0.64元/(kW·h),比单纯光热发电经济性提高了31%。孤网运行条件下,在光伏-塔式光热SCO_(2)混合发电系统基础上增设柴油发电机组后,能够有效提升太阳能发电系统的供电可靠性,柴油发电占比仅为1.5%,柴油发电机组的年运行时长不足200 h即可保证100%满足实时电负荷需求。In view of the high cost of the current solar thermal power generation system and the large fluctuation of photovoltaic power generation,a photovoltaic-tower photothermal supercritical carbon dioxide Brayton cycle(SCO_(2))hybrid power generation system is proposed,and the influence law of the key configuration parameters of the system on economical efficiency and environmental protection performance is studied.The multi-objective optimization of system parameter configuration is carried out based on different load types,and the operating characteristics of the hybrid power generation system under different application scenarios are explored.The simulation results show that when the ratio of solar thermal power generation in the hybrid power generation system increases,the economical efficiency of the system decreases,but the environmental protection performance improves.Increasing the total fixed power of the hybrid power generation system can reduce the system’s levelized cost of energy.When the solar multiple is 4 and the heat storage time is 18 h,the minimum value of the levelized cost of energy is 0.64 yuan/(kW·h),which is 31%higher than the economical efficiency of solar thermal power generation alone.Under isolated grid operation conditions,the addition of diesel generator sets to the hybrid power generation system can effectively improve the power supply reliability of the solar power generation system.When the proportion of diesel power generation is only 1.5%,and the annual operation time of diesel generator sets is less than 200 h,all the real-time power load demand will be met.

关 键 词：光热发电 光伏发电 超临界二氧化碳 布雷顿循环 多目标优化 运行特性 

分 类 号：TK514[动力工程及工程热物理—热能工程]