Abstract: In order to overcome the influence of solar intermittent on the solar-assisted coal-fired power generation system,a trough solar-assisted coal-fired power generation system with heat storage device is proposed for a 350 MW coal-fired power unit. In this system,heat storage devices are arranged side by side. During the day,part of the heat transfer oil heated by solar collector enters the oil-water heat exchanger to heat the feed water of thermal power units,while the other part enters the heat storage device for storing heat to heat the feed water at night. Taking the solar energy data on spring equinox day as an example,the scheme of the system is designed,and the thermal performance of the system is simulated by using EBSILON software. The results show that the system can save 26.3 t of standard coal per day compared with the original coal-fired generating unit. Based on the solar energy data at 17:00,the number of packed bed heat storage tanks was designed and the temperature field was simulated.