Frequency Regulation Capacity Analysis of a Coal-Fired Power Plant Integrated with A Steam Energy Storage System
To achieve carbon peak and neutrality targets,a new type power system is being con-structed in China,and the operational flexibility of coal-fired power plants should be enhanced.The integration of steam energy storage system is an effective way to enhance the frequency regulation capability of coal-fired power plants.Dynamic models of steam accumulator and steam turbine ther-mal system were developed in this study,and the dynamic characteristics of the steam accumulator and turbine thermal system were studied during the charging and discharging processes of the steam accumulator.Moreover,the energy efficiency and frequency regulation capability of the steam ac-cumulator were evaluated.Results show that the steam accumulator has a fast response speed to support the frequency regulation of coal-fired power plants,and the equivalent round-trip efficiency is 46.62％when the steam accumulator is charged at 30％THA condition and discharged at 100％TH A condition.
steam accumulatorcoal-fired power plantsoff-design conditionsfrequency regula-tionenergy storage efficiency
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