Research on optimal configuration for integrated energy system with liquid air energy storage combined heat and power supply

doi:10.19799/j.cnki.2095-4239.2024.0045

Abstract

Abstract:

Liquid air energy storage (LAES) has significant potential for use in multi-energy coupled integrated energy systems. Appropriately configuring energy storage capacity can enhance the low-carbon and economic operation of these systems. However, current research has yet to fully account for the combined heat and power supply characteristics of LAES. Therefore, this study proposes a configuration optimization method for a combined heat and power supply LAES-coupled integrated energy system. Based on the foundational architecture of the integrated energy system, we develop heat and power co-supply and constraint models for system components. The system's total annual cost, encompassing the initial equipment investment, operation and maintenance costs, energy purchase expenses, and penalties for solar and wind energy abandonment, serves as the objective function. Considering the constraints of system energy balance, equipment capacity, equipment output, interaction with external networks, and energy storage constraints, we establish an optimal configuration model. This model is solved using the mixed-integer linear programming method. A real-world park scenario is used to set up five different scenarios for comparative analysis of optimization results. The simulation findings demonstrate that an integrated energy system incorporating LAES heat and power co-supply can effectively meet real-time system energy demands while achieving better economic and environmental outcomes. Compared with traditional sub-supply systems, the integrated approach reduces total costs by 37.1% and carbon emissions by 71.50%. It also offers substantial benefits in terms of lowering carbon emissions and minimizing wind and solar energy waste. This study provides a theoretical basis for the effectiveness of the optimization model for a heat and power co-supply LAES-coupled system and promotes the commercial application of LAES in integrated energy systems.

Key words: liquid air energy storage, integrated energy system, combined heat and power supply, allocation optimization, mixed integer linear programming

CLC Number:

TK 01

Siyuan HUANG, Chen WANG, Ting LIANG, Zhu JIANG, Jiajing LI, Xiaohui SHE, Xiaosong ZHANG. Research on optimal configuration for integrated energy system with liquid air energy storage combined heat and power supply[J]. Energy Storage Science and Technology, 2024, 13(6): 1929-1939.

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时段	购电价格/(元/kWh)	时刻
峰时	1.1865	10:00~17:00

平时	0.8102	8:00~9:00 18:00~21:00

低谷	0.4015	1:00~7:00 22:00~24:00

运行参数	数值	运行参数	数值
压缩机级数	3	发电透平级数	3
压缩机压缩比	4.48	发电透平膨胀比	4.93
压缩机等熵效率	0.85	发电透平等熵效率	0.87
压缩机电转换效率	0.9	发电透平电转换效率	0.9
压缩机功率下限	0.4	发电透平功率下限	0.4
压缩机进口温度/K 第一级第二级第三级	293 309 309	透平进口温度/K 第一级第二级第三级	458.1 458.1 458.1
液空储罐容量上下限	0.1~0.8	液空储罐容量初值	0.2

设备名称	技术参数
燃气轮机	电效率热效率最小负载率	0.32 0.54 0.3

燃气锅炉	热效率	0.85

蓄电池	耗散率充放电效率最大充放电倍率初始状态储电状态范围	0.001 0.9 0.25 0.2 0.2~0.8

蓄热箱	耗散率充放热效率最大充放热倍率初始状态储热状态范围	0.01 0.9 0.25 0.2 0.1~0.8

设备名称	投资成本 /(元/kW)	维护成本 /(元/kW)	安装容量范围	使用寿命/年
光伏	10000	0.01	0~30 MW	20
风机	4500	0.019	0~30 MW	20
燃气轮机	8350	0.085	0~15 MW	20
燃气锅炉	800	0.045	0~15 MW	15
蓄电池	1500	0.043	0~30 MWh	10
蓄热箱	150	0.023	0~30 MWh	20

设备种类	方案1	方案2	方案3	方案4	方案5
燃气轮机/MW	0	10	10	9	9
燃气锅炉/MW	32	15	15	15	15
光伏/MW	0	6	4	1	1
风机/MW	0	27	28	30	30
蓄热箱/MW	0	0	19.24	16	16
空气压缩机/MW	0	0	0	4.04	4
发电透平/MW	0	0	0	2	2
液态空气储罐/t	0	0	0	200	205
蓄电池/MW	0	0	9.13	0	0