The model of integrated solar combined cycle(ISCC) system was built by Ebsilon software

and the topological structure of the ISCC system under varying load conditions was optimized

and an inlet water heating method of solar collector was proposed to improve the operation performance of the ISCC system under variable working condition. The simulation results show that

the output power of the ISCC system will increase compared with that before the optimization

under the design of solar integrated scale

with the addition of solar inlet water heater

when the gas turbine runs at reduced load

the ambient temperature increases and the solar radiation intensity increases. When the load rate of the gas turbine decreases from 100 % to 30 %

the system power increment increases from 0 to 0.240 MW. When the ambient temperature increases from 15 ℃ to 35 ℃

the system power increment increases from 0.011 MW to 0.291 MW. When the solar radiation intensity increases from 600 W/m~2 to 800 W/m~2

the system power increment increases from 0.109 MW to 0.477 MW. This conclusion can provide a theoretical basis for the design of ISCC power station.