太阳能辅助燃煤发电系统蓄热运行策略优化

Optimization of Storage Operation Strategy for Solar Aided Coal-Fired Power Generation(SACPG) System

太阳能辅助燃煤发电已经被证明是一种有效利用太阳能的发电方式。与纯太阳能光热发电系统不同,太阳能辅助燃煤互补发电系统(下简称互补发电系统)中采用不同的蓄热运行策略将对互补系统的性能产生显著影响。本文针对槽式互补发电系统,建立了槽式太阳能集热场以及互补系统的数学模型,采用了真实的气象数据进行仿真模拟,研究分析了互补发电系统的年性能,得出了不同太阳能倍数、蓄热小时数对互补系统的太阳能发电成本LCOE的影响规律,并据此优化蓄热运行策略。其结果表明:三种策略中,削峰填谷策略是最适合互补发电系统的运行策略,在0.5蓄热小时数、1.2太阳能倍数下,其太阳能发电成本取得极小值,为0.064$/kWh。

Solar aid coal-fired power generation（SACPG） technology has been proved to be an efficient way in the utilization of solar energy.Different from solar-only generation,operation strategy has big impacts on performance.In this paper,a math model of parabolic trough solar field integrated with coal-fired unit has been established.Annual performance of SACPG system is analyzed under different storage capacity（hours） and solar multiple,and the effect on the levelized cost of electricity（LCOE） of SACPG system can be obtained also.Based on it,optimization of operation strategy could be found.The results show that the first operation strategy is the most suitable strategy of the SACPG system.The minimum LCOE is 0.064 $/kWh with 0.5-hours storage capacity and 1.2 solar multiple.