Economic efficiency analysis of operation strategies for the solar-coal peak-shaving system with steam extraction and molten salt thermal energy storage based on wind and solar power integration amount

doi:10.3969/j.issn.2097-0706.2026.05.009

Abstract

Abstract:

To solve the problem of coordinating peak-shaving flexibility and economic efficiency of coal-fired units under the background of high-proportion wind-solar power integration， 600 MW subcritical coal-fired units were taken as the research object， and a deep peak-shaving system with solar-coal coupling based on steam extraction and molten salt thermal energy storage was proposed. In view of the limitation that existing research fails to fully consider the interaction between wind and solar power integration amount and the operation strategies for the peak-shaving system， a life-cycle cost system covering initial investment， operation and maintenance， and coal cost was established. Additionally， an economic model was established with net present value， dynamic investment payback period， levelized cost of electricity， and wind and solar power curtailment as evaluation indicators. Combined with wind and solar output curves and daily load curves， seven differentiated operation strategies were designed， and their multi-dimensional performance was comprehensively optimized and selected using the entropy weight-TOPSIS method. The results showed that strategy 1 was optimal for comprehensive performance. By precisely matching the thermal energy storage timing of high wind and solar power output with low load periods， strategy 1 achieved the triple advantages of a net present value of 1.807 1×10⁹ yuan， a dynamic investment payback period of 7.424 a， and wind and solar power curtailment of 2 090 MW·h. The system output power closely followed the daily load curves， and the wind and solar power integration ratio reached 72.54%.

Key words: molten salt thermal energy storage, solar-coal coupling, deep peak shaving, wind and solar power integration, operation strategies, entropy weight-TOPSIS method, economic efficiency

CLC Number:

TK01

CUI Yaru, LU Yuanwei, WANG Zixuan, YANG Han, WU Yuting. Economic efficiency analysis of operation strategies for the solar-coal peak-shaving system with steam extraction and molten salt thermal energy storage based on wind and solar power integration amount[J]. Integrated Intelligent Energy, 2026, 48(5): 83-94.

Figures/Tables 17

Table 1

Table 2

Fig.1

Table 3

Fig. 2

Fig.3

Table 4

Table 5

Operation strategies for peak-shaving system

运行策略时间	策略1	策略2	策略3	策略4	策略5	策略6	策略7
00:00	50%THA	释热	释热	释热	释热	75%THA	75%THA
01:00	50%THA	释热	释热	50%THA	75%THA	75%THA	50%THA
02:00	50%THA	释热	75%THA	释热	75%THA	75%THA	75%THA
03:00	75%THA	75%THA	75%THA	释热	75%THA	75%THA	75%THA
04:00	释热	释热	释热	释热	释热	释热	释热
05:00	75%THA	释热	释热	释热	释热	释热	释热
06:00	50%THA	抽汽储热	抽汽储热	抽汽储热	抽汽储热	抽汽储热	抽汽储热
07:00	释热	抽汽储热	抽汽储热	抽汽储热	抽汽储热	抽汽储热	抽汽储热
08:00	75%THA	抽汽储热	抽汽储热	抽汽储热	抽汽储热	抽汽储热	抽汽储热
09:00	75%THA	抽汽储热+光热储热	抽汽储热	抽汽储热	抽汽储热	释热	释热
10:00	75%THA	抽汽储热+光热储热	释热	50%THA+光热储热	释热	释热	释热
11:00	75%THA+光热储热	75%THA+光热储热	释热	释热	释热	75%THA+光热储热	75%THA
12:00	75%THA+光热储热	释热	75%THA+光热储热	释热	75%THA+光热储热	75%THA+光热储热	50%THA+光热储热
13:00	50%THA	释热	75%THA+光热储热	75%THA+光热储热	75%THA+光热储热	50%THA+光热储热	50%THA+光热储热
14:00	50%THA	75%THA+光热储热	75%THA+光热储热	50%THA+光热储热	75%THA+光热储热	50%THA	50%THA+光热储热
15:00	75%THA	75%THA+光热储热	50%THA+光热储热	50%THA+光热储热	50%THA+光热储热	50%THA	50%THA
16:00	75%THA	释热	50%THA	50%THA	50%THA	50%THA	50%THA
17:00	释热	释热	释热	释热	释热	释热	释热
18:00	释热	释热	释热	释热	释热	释热	释热
19:00	释热	释热	释热	释热	释热	释热	释热
20:00	释热	释热	释热	释热	释热	释热	释热
21:00	50%THA	释热	释热	释热	释热	释热	释热
22:00	抽汽储热	释热	释热	50%THA	释热	75%THA	50%THA
23:00	抽汽储热	释热	50%THA	50%THA	释热	50%THA	50%THA

Table 5

Table 6

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Table 7

Fig.10

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热力指标	工况
热力指标	100%THA	75%THA	50%THA
额定功率/MW	600.18	450.19	300.03
主蒸汽流量/（t·h^-1)	1 844.00	1 369.50	894.30
主蒸汽压力/MPa	16.67	14.40	9.77
主蒸汽温度/℃	538.00	538.00	538.00
再热蒸汽流量/（t·h^-1)	1 582.81	1 203.63	804.23
再热蒸汽压力/MPa	3.41	2.60	1.71
给水温度/℃	276.00	257.42	235.50

参数	100%THA			75%THA			50%THA
参数	设计值	模拟值	误差/%	设计值	模拟值	误差/%	设计值	模拟值	误差/%
发电功率/MW	600.18	600.33	0.02	450.21	450.73	0.12	300.03	299.74	0.10
主蒸汽流量/（t·h^-1)	1 848.78	1 844.00	0.26	1 350.31	1 369.50	1.42	900.11	894.30	0.65
主蒸汽压力/MPa	16.67	16.67	0.00	14.40	14.40	0.00	9.77	9.77	0.00
再热蒸汽流量/（t·h^-1)	1 576.13	1 582.81	0.42	1 173.44	1 203.63	2.57	789.27	804.23	1.90
再热蒸汽压力/MPa	3.41	3.41	0.00	2.56	2.60	1.39	1.75	1.71	2.10
^#1抽汽温度/℃	276.07	276.09	0.01	256.26	257.42	0.45	232.84	232.84	0.00
^#2抽汽温度/℃	245.44	245.44	0.00	228.95	230.02	0.47	208.45	208.44	0.00
^#3抽汽温度/℃	210.91	211.96	0.49	198.2	199.15	0.48	180.76	180.75	0.01
^#4抽汽温度/℃	178.34	178.33	0.01	166.68	167.47	0.47	151.9	151.88	0.01
^#5抽汽温度/℃	154.99	154.97	0.01	144.56	145.27	0.49	131.28	131.25	0.02
^#6抽汽温度/℃	121.66	121.62	0.03	113.05	113.65	0.53	102.07	102.00	0.07
^#7抽汽温度/℃	89.52	89.42	0.11	82.42	82.91	0.60	73.47	73.30	0.23

参数	设定值	参数	设定值
高温熔盐温度/℃	560.00	t_zp1/℃	538.00
中温熔盐温度/℃	328.00	t_zp2/℃	189.00
低温熔盐温度/℃	184.00	t_fp1/℃	175.97
主蒸汽抽汽量/（t·h^-1)	169.02	t_fp2/℃	263.76
光汽储热比	3	t_fp3/℃	322.50
储热基准工况	50%THA	t_fp4/℃	538.00
释热基准工况	75%THA	t_fp5/℃	538.00

时间	上网电价
00:00 — 04:00	0.205
04:00 —06:00	0.427
06:00 — 08:00	0.717
08:00 — 11:00	0.427
11:00 — 16:00	0.205
16:00 — 18:00	0.427
18:00 — 22:00	0.717
22:00 — 24:00	0.427

运行策略	净现值/10⁷元	动态投资回收期/a	平准化度电成本/[元·(kW·h)^-1]	风光弃电量/(MW·h)	得分
1	180.71	7.424	0.382	2 090	0.28
2	173.41	7.749	0.360	5 905	0.19
3	159.65	8.080	0.368	6 015	0.16
4	138.98	8.725	0.374	5 965	0.14
5	173.47	7.701	0.366	7 839	0.11
6	171.65	7.702	0.374	7 949	0.07
7	170.17	7.741	0.379	8 049	0.05
权重	0.138	0.138	0.257	0.468