耦合蒸汽熔盐储热的燃煤机组调频响应特性研究

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Abstract To investigate the improvement of steam molten salt thermal energy storage (TES) on the frequency regulation performance of coal-fired units, this paper establishes a dynamic model of the molten salt TES system and analyzes the dynamic characteristics of the molten salt during the charging and discharging stages. Taking a 330 MW subcritical coal-fired unit as an example, a control method for molten salt-assisted unit frequency regulation based on power deviation is proposed, and the automatic generation control (AGC) response characteristics of coal-fired units coupled with steam molten salt TES are studied. The research results show that the power response amplitude and speed of the unit during the charging stage are greater and faster than those during the discharging stage. The charging/discharging process of molten salt TES can partially compensate for the response deficiency caused by the thermal inertia of coal-fired units, significantly improving the AGC response quality of coal-fired units and alleviating overshoot and reverse adjustment to a certain extent. Within 1 200 seconds, the average value of the comprehensive response index K_p increases from 1.21 to 3.04, and the average load change rate increases from 0.99%P_N/min to 3.32%P_N/min. During this process, the average power response contribution rate of molten salt TES reaches 71%, indicating that the steam molten salt TES technology can significantly enhance the frequency regulation performance of coal-fired units. This study is of great significance for promoting the application and expansion of molten salt TES technology in coal-fired power plants.

Key words： molten salt thermal energy storage coal-fired unit automatic generation control (AGC) dynamic characteristics

Received: 07 May 2025

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	Articles by authors
	LUAN Jun
	MA Yong
	SONG Lei
	GE Mingming
	SHANG Zhijie

Cite this article:

LUAN Jun,MA Yong,SONG Lei等. Study on frequency regulation response characteristics of a coal-fired unit integrating steam molten salt thermal energy storage[J]. Electrical Engineering, 2025, 26(9): 13-20.

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https://dqjs.cesmedia.cn/EN/Y2025/V26/I9/13

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