高能量密度超级电容器单体设计与制备及其在火电调频中的应用

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Abstract In order to meet the flexibility transformation requirements of thermal power units under the “dual carbon” goal, this paper designs and develops a high-energy density lithium-ion supercapacitor monomer to address the bottleneck problems of insufficient frequency response rate of traditional lithium-ion batteries and limited energy density of supercapacitors. A supercapacitor unit with a rated capacity of 17 000 F, energy density of 90 W∙h/kg, and power density of 10 kW/kg is developed by using a hybrid energy storage mechanism of hard carbon negative electrode/activated carbon positive electrode. According to QC/T 741—2014 standard testing, the monomer maintains a capacity retention rate of 83.2% in the temperature range of -20~55℃. After 50 000 cycles, the capacity decay rate is only 16.8%. After 1 000 hours of high-temperature aging, the capacity remains at 87.3%. When applied to a 5 MW supercapacitor +15 MW lithium-ion hybrid frequency regulation system, the frequency regulation performance index is improved by 60% compared to traditional coal-fired units, and the full life cycle cost is lower than that of pure lithium battery solutions. Research has shown that this high- energy-density supercapacitor unit effectively solves the prominent contradiction between high power demand and equipment lifespan in thermal power frequency regulation scenarios through its “second level response + ten thousand cycles” characteristics.

Key words： lithium-ion supercapacitor thermal power frequency regulation hybrid energy storage system energy density cycle life economic analysis

Received: 07 May 2025

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	Articles by authors
	DANG Guoju
	XU Wenhao
	WU Pengyue
	ZHENG Yun
	QIU Fengtao

Cite this article:

DANG Guoju,XU Wenhao,WU Pengyue等. Design and preparation of high-performance supercapacitor units and their application in thermal power frequency regulation[J]. Electrical Engineering, 2025, 26(9): 21-27.

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https://dqjs.cesmedia.cn/EN/Y2025/V26/I9/21

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