Solar-aided　coal-fired　power　generation　is　a　hybrid　technique　to　generate　power　with　the　coal　and　solar　energy.　The　performance　of　solar-aided　coal-fired　power　plant　(SACFPP)　with　solar　irradiance　fluctuations　received　little　attention　in　previous　studies.　Dynamic　and　exergy　analysis　models　of　SACFPP　are　developed　to　evaluate　the　SACFPP　performance　in　transient　processes　caused　by　solar　irradiance　disturbances　and　the　consequent　system　regulation.　An　SACFPP　integrating　the　trough　collector　system　(TCS)　in　parallel　with　HP2　and　HP3　heaters　of　a　660　MW　coal-fired　power　plant　is　simulated.　Influences　of　solar　irradiance　and　feedwater　ratio　to　TCS　disturbances　on　SACFPP　performance　are　analyzed,　including　step　cases　and　typical　solar　days.　The　solar-to-power　exergy　efficiency　fluctuates　sharply　in　the　dynamic　process.　It　increases　from　32.62%　to　57.25%　and　decreases　to　28.1%　when　solar　irradiance　step　decreases　from　700　to　400　W　m(-2).　Accumulations　of　additional　power　and　exergy　destruction　are　the　highest　in　Autumn　Equinox.　Then,　control　strategies　of　feedwater　flow　to　TCS　are　proposed　and　compared　to　obtain　maximal　solar-to-power　exergy　efficiency　during　transients.　Results　indicate　that　the　feedwater　flow　to　TCS　should　follow　the　solar　irradiance　decrease　with　a　dynamic　period　of　less　than　200　s;　otherwise,　extra　exergy　destruction　occurs.　(C)　2021　Published　by　Elsevier　Ltd.