Capacity optimization of thermal storage system for renewable-thermal-storage generation plant in power spot market

doi:10.19799/j.cnki.2095-4239.2023.0335

Abstract

Abstract:

Renewable heat-storge generation plant is a new type of generation system that combines renewable generation and thermalstorage to optimize the generation of the plant. It has the advantages of controllability, high efficiency, and clean generation. When the power spot market widely takes place in China's power industry, maximizing the generation revenue of renewable plants in the power market with varying generation prices becomes the most critical task for the generation company. This paper proposes capacity optimization of the thermal storage system for the renewable-thermal-storage generation plant. An optimization generation model of renewable-thermal-storage generation plants is established. Maximizing the plant'srevenue is the objective function of the model. The model considers a variable locational marginal price and renewable accommodation capability at the plant node of the transmission network. Charging and discharging schedules of thermalstorage are optimized as the variables to simulate the optimal generation in the power market with consideration of renewable generation profile, parabolic troughs characteristics, the heat-storage capacity, and their coupling behavior. Based on the optimization generation model, a two-stage evaluation model is designed to optimize the capacity of thermal storage system using the internal return rate as the economic benefit index. Finally, the case study shows that the proposed optimization method can find the optimal thermal storage capacity for the actual planning of the renewable project. In comparison with the conventional economic evaluation method, a method is innovatively realized in the paper for the optimization model and the planning method for the heat storage system. Renewable generation plants will most likely operate in the power market with varying market prices. Therefore, the method can provide an objective and accurate optimal plan of heat storage in a power market for generation companies and energy storage investors and ensure the investment return and reduce financial risk.

Key words: renewable generation, solar thermal storage generation system, thermal storage system, optimizationmodel, powerspot market, economicbenefit

CLC Number:

TK 02

Hang YIN, Jianfang TANG, Ji ZHANG, Hao YAN, Xiaorui HU, Shu WANG. Capacity optimization of thermal storage system for renewable-thermal-storage generation plant in power spot market[J]. Energy Storage Science and Technology, 2023, 12(9): 2842-2853.

Figures/Tables 15

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Table 1

Operational parameters of the renewable-CSP integrated plant"

参数	参数值	参数	参数值
$η P W$	0.96	$Q F S, m a x$	500
$η W S$	0.42	$Q W S, m a x$	300
$T o f f$	1	$P m a x$	300
$T o n$	1	$P D$	270
$P C S P, m a x$	300	$P C S P, m i n$	0

Table 1

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Table 2

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Table 3

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Table 4

Table 5

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方案	最大充放能功率 /MW	储热容量 /MWh	储热系统年利润/万元	IRR
CASE1	50	250	475	-12.36%
CASE2	100	500	1727	-3.47%
CASE3	150	750	6171	14.46%
CASE4	200	1000	7891	13.39%
CASE5	250	1250	9486	12.41%
CASE6	300	1500	10856	11.26%
CASE7	350	1750	12008	10.00%
CASE8	400	2000	12975	8.72%
CASE9	450	2250	13764	7.41%
CASE10	500	2500	14394	6.11%

方案	最大充放能功率 /MW	储热容量 /MWh	储热系统年利润/万元	IRR
CASE11	143.6	718	5941	14.597%
CASE12	143.8	719	5947	14.608%
CASE13	144.0	720	5961	14.624%
CASE14	144.2	721	5969	14.622%
CASE15	144.4	722	5972	14.596%

方案	最大充放能功率 /MW	储热容量 /MWh	储热系统年利润 /万元	IRR
CASE16	143.6	718	5770	13.697%
CASE17	143.8	719	5776	13.707%
CASE18	144.0	720	5790	13.722%
CASE19	144.2	721	5798	13.720%
CASE20	144.4	722	5801	13.696%

方案	最大充放能功率 /MW	储热容量 /MWh	储热系统年利润 /万元	IRR
CASE21	143.6	718	5704	13.345%
CASE22	143.8	719	5710	13.356%
CASE23	144.0	720	5724	13.370%
CASE24	144.2	721	5731	13.368%
CASE25	144.4	722	5734	13.345%

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