In order to build a large capacity flexible power supply and solve the dilemma of balancing winter peak shaving and heating for coal-fired units

six new “solar thermal storage” integrated power generation systems are proposed based on conventional thermal power plants(CFPP)

utilizing solar energy and molten salt thermal storage to balance winter heating. The system is modeled using EBSLION software

and a comparative analysis is conducted on thermal performance and peak shaving performance of each scheme from the perspectives of thermal storage load and electricity load. The use of a “steam extraction + electric heating” thermal storage scheme significantly improves the peak shaving capability of thermal power units. Among the various schemes

Scheme W1 exhibits the maximum peak shaving depth of 92.71%

Scheme W6 shows a minimum comprehensive coal consumption of only 178.15 g/(kW·h)

with a daily saving of 182 tons of standard coal. In addition

Scheme W2 achieves the highest cycle thermal efficiency of 55.2%. The use of the “light coal” storage scheme fully enhances the backup capacity of the supercritical carbon dioxide(S-CO_2) system

and the “extraction steam storage heat” drives the “small turbine” to assist the S-CO_2 system in heating

achieving the dual goal of peak shaving heating in winter. This type of system not only expands the peak shaving capacity of coal-fired units

ensuring heating for people's livelihoods

but also fully utilizes solar energy resources

reduces coal consumption per kilowatt hour

and enhances the reserve capacity and power generation hours of S-CO_2 systems

providing theoretical and engineering guidance for the construction of high-capacity flexible regulation power sources.