风电-压缩空气储能系统火用和火用成本分析模型

Exergy and exergy cost analysis model for wind-compressed air energy storage system

风电-压缩空气联合运行系统中存在多种能量输入,从而使得对其系统性能的评价更为复杂。为了准确衡量风能在系统中的存储、释放、转换特性,本文基于热力学第二定律和热经济学原理,在火用成本分析方法基础上提出利用风能火用流比例系数α和风能火用成本比例系数γ评价风电-压缩空气储能联合运行系统中风电存储能耗特性和经济性。实例计算结果表明:风电-压缩空气储能系统的单位发电火用成本为1.038元/(kW·h),其中释放存储的风能所占单位发电火用成本比例85.71%,该比例会随着风电成本和天然气价格的增加而降低。该方法可在系统中存在不同能量输入时详细地描述风能在存储和释放过程中的能耗特性和存储风能所需的成本,为储能政策的制定提供一定的理论依据。

Different energy inputs exist during the operation of wind-compressed air combined system,which makes the system performance evaluation turn more complicate.To accurately measure the characteristics of storage,release and transfer of the wind,a new method evaluating the energy consumption and economy of the wind-compressed air energy storage system was proposed,on the basis of the second law of thermodynamics and the principle of thermoeconomics.The ratio of wind exergyαand ratio of wind exergy costγwere firstly used in the new method to analyze the energy loss and the cost in charging and discharging wind energy process in detailed when there were different energy sources in the wind-compressed air energy storage system.The results show that the discharging wind energy exergy cost of the wind-compressed air energy storage system was 1.038yuan/（kW·h）,while the cost of the wind exergy discharging accounts for 85.71% and this proportion would be increased with the increase of wind power costs and decrease of nature gas prices.Therefore,this study not only supplies the theoretical reference for the future research of analysis methods,but also is a theory basis for energy storage subsidy.