Aiming at the defects of low-efficiency power generation of medium-low temperature geothermal power plants, a medium-low temperature hybrid solargeothermal power generation system was proposed. Through MATLAB simulation calculation, the performance analysis of the stand-alone geothermal plant and the hybrid solar- geothermal plant (HSGP) was carried out. According to ambient temperature, solar radiation intensity and geothermal resources, this paper selected areas with typical meteorological conditions for time-by-time simulation. The results show that the HSGP has better performance than the stand-alone geothermal power plant. When the power-increasing operation scheme is adopted, the HSGP in the Lhasa area has the largest increase in power generation compared to the stand-alone geothermal power plant, and the annual average monthly increase percentage is 3.0%. When the geothermal water-saving operation scheme is adopted, the HSGP in Xi’an area has the largest amount of geothermal water saving compared to the stand-alone geothermal power plant, and the annual average monthly savings is 4.0%. The simulation results provide a theoretical basis for the location and performance evaluation of the HSGPs.
Keywords hybrid, solar-geothermal, power plant, performance analysis, power-increasing, geothermal water-saving