摘要
为研究蒸汽熔盐储热对燃煤机组调频性能的提升情况,本文建立熔盐储热系统的动态模型,分析熔盐蓄热阶段与放热阶段的动态特性。以一台330MW亚临界燃煤机组为例,提出基于功率偏差的熔盐辅助机组调频的控制方法,并研究耦合蒸汽熔盐储热的燃煤机组自动发电控制(AGC)的响应特性。研究结果表明,相较于放热阶段,机组在蓄热阶段的功率响应幅度更大,响应速度更快。熔盐通过蓄热/放热过程弥补了由于燃煤机组热惯性导致的响应不足,燃煤机组的AGC响应品质明显提升,改善了超调与反调现象。在1200s时间内,综合响应指标Kp平均值从1.21提升至3.04,平均变负荷速率从0.99%PN/min提升至3.32%PN/min。在此过程中,熔盐储热的平均功率响应贡献率达71%,表明蒸汽熔盐储热技术可显著提升燃煤机组调频性能。本文研究对推动熔盐储热技术在燃煤电厂的应用拓展具有重要意义。
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 1200 seconds,the average value of the comprehensive response index Kp increases from 1.21 to 3.04,and the average load change rate increases from 0.99%PN/min to 3.32%PN/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.
作者
栾俊
马勇
宋磊
葛明明
尚志杰
LUAN Jun;MA Yong;SONG Lei;GE Mingming;SHANG Zhijie(Huaneng Jinan Huangtai Power Plant Co.,Ltd,Jinan 250033)
出处
《电气技术》
2025年第9期13-20,61,共9页
Electrical Engineering
关键词
熔盐储热
燃煤机组
自动发电控制(AGC)
动态特性
molten salt thermal energy storage
coal-fired unit
automatic generation control(AGC)
dynamic characteristics
作者简介
栾俊(1978-),男,山东青岛人,高级工程师,主要从事电厂节能技术、安全生产管理方面的工作。
