Taking the capacity-expanded geothermal and trough type solar power combined generation system as the research object

the temperature at outlet of the solar energy collector was estimated to obtain the optimum outlet temperature.Evaluation models for such indexes as generation efficiency

the increasing ratio of power generation capacity and solar energy utilization fraction were set up to analyze the thermal performance of this system.By applying the Aspen Plus software

the geothermal-solar energy combined power generation system model for the Yangbajing geothermal power station in Tibet was established.Moreover

sensitivity analysis and optimization tool were used to calculate major parameters of this system

to obtain the best capacity expansion temperature

which is helpful to the system's capacity espansion.The results show that

after the optimization

the generation power of the system was 4 044.5kW

the generation efficiency was 13.1%

the hot water consumption was 94kg/(kW·h)

the steam consumption rate was9.2kg/(kW·h)

the solar energy utilization percentage was 58.1%

and the power generation increment ratio was 30.0%.Each performance index of the system enhanced significantly.