Economic analysis of integrated energy system based on liquid air energy storage

doi:10.19799/j.cnki.2095-4239.2021.0211

Abstract

Abstract:

The integrated energy system is studied with the park as the backdrop, based on the two modes of "ordering power by heat" and "ordering heat by power." This paper develops eight schemes to compare changes in output power of each subsystem and total cost when the system is configured with and without liquid-air energy storage using two typical summer and winter days as examples. When operating in the "ordering power by heat" mode, the results show that when liquid-air energy storage is configured in the park, the economic benefit is the greatest and the smallest energy loss. On Great Heat Day, the total cost is 6.1% less than the system without liquid-air energy storage. On a Great Cold Day, the total cost is 4.5% less than the system without liquid-air energy storage. Furthermore, the system's total cost operating in "ordering power by heat" is lower than that in the mode of "ordering heat by power" when the system is equipped with liquid-air energy storage. On Great Heat Day, the total cost is reduced by 9.5%, and on Great Cold Day, the total cost is reduced by 4.5%.

Key words: integrated energy system, liquid-air energy storage, total cost, power by heat ordering, power by heat ordering

CLC Number:

TK 02

Guqiang WEI, Congchuan HU, Yixue LIU, Shuangshuang CUI, Hong LI. Economic analysis of integrated energy system based on liquid air energy storage[J]. Energy Storage Science and Technology, 2021, 10(6): 2403-2410.

Figures/Tables 10

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时段	电价/[元/(kW·h)]	天然气价/(元/m³)
07:00—08:00	0.6586	2.5
08:00—11:00	0.9441	2.5
11:00—18:00	0.6586	2.5
18:00—23:00	0.9441	2.5
23:00—07:00	0.3891	2.5

设备类型	最小功率/MW	额定功率/MW	发电效率/%	储能效率/%	制冷效率/%	制热效率/%	制冷系数	热能自耗散效率/%
光伏	0	5	—	—	—	—	—	—
CCHP	5	10	0.35	—	0.2	0.4	—	0.05
电制冷机	0	1	—	—	—	—	3.2	—
电锅炉	0.4	1	—	—	—	0.98	—	—
LAES系统	0	6.5	—	0.6	—	—	—	—

设备类型	天然气热值/(kW·h/m³)	光伏补贴/[元/(kW·h)]	单位成本费/(元/kW)	单位折旧费/[元/(kW·h)]	使用年限/年
光伏	—	0.1	9000	0.0235	20
CCHP	10.08	—	5500	0.1	20
电制冷机	—	—	700	0.015	15
电锅炉	—	—	1500	0.021	20
LAES系统	—	—	4500	0.015	30

方案	典型日	LAES配置	优先负荷
1	大寒	无	电
2	大寒	有	电
3	大寒	有	热
4	大寒	无	热
5	大暑	无	电
6	大暑	有	电
7	大暑	有	热
8	大暑	无	热

方案	1	2	3	4	5	6	7	8
购电成本/元	21215	13554	25980	55486	13406	6384	17534	53413
购气成本/元	60941	44642	27998	27998	71570	49603	31225	31225
光伏装置成本/元	5401	5401	5401	5401	3255	3255	3255	3255
CCHP系统装置成本/元	16134	13834	11485	11485	17634	14534	11941	11941
电制冷装置成本/元	64	64	79	64	84	97	76	76
电锅炉装置成本/元	214	248	279	260	205	205	205	205
LAES系统装置成本/元	—	4016	4091	—	—	4269	4270	—
LAES系统储电成本/元	—	18885	20840	—	—	25444	25472	—
总成本/元	103969	100644	96154	100694	106155	103792	93978	100115