Abstract: To investigate the dynamic performance and exergy loss characteristics of the tower-type heat-collecting solar aided coal-fired power plant (SACFPP) system under solar irradiance disturbances, a dynamic model of the system was established. The energy conversion characteristics and exergy loss patterns of the system under solar irradiance intensity disturbances were analyzed, along with the differences in dynamic response time scales of the SACFPP system with coupled heat storage under solar irradiance intensity disturbances. Additionally, the transient operational performance of the system under continuous changes in solar irradiance under typical meteorological conditions was studied. Results show that the stabilization time of the SACFPP system with coupled heat storage is longer than that of the system without heat storage, and the larger the storage tank capacity, the longer the stabilization time. Under 100% turbine heat acceptance (THA) condition, when the solar irradiance undergoes a step change of -15% to +15% from 900 W/m², the power output of system changes from 660 MW to 656.9-663.1 MW during the transient process, and the solar-to-electricity exergy efficiency changes from 29.7% to 26.6%-32.0%. After coupling heat storage, system fluctuations can be effectively reduced, and as the heat storage capacity increases, the fluctuation amplitude further decreases.