The Fresnel solar energy aided coal-fired power system is the combination of solar energy and coal-fired power plant.The heat collected by Fresnel solar collector field is used to replace the first stage high pressure extraction from coal-fired power plant.The substituted extraction steam is returned to the turbine to do work.There are two kinds of operation modes

fuel-saving mode and power boosting mode.This paper calculated the thermal performance and economic performance of both the two operation modes

based on the simulation results of thermodynamic calculation program.The results show that

the coal consumption rate of the integrated system in fuel-saving mode is 15.04g/(kW·h)lower than that of the original coal-fired power plant

the output of the integrated system in power boosting mode is 57.8 MW higher than that of the coal-fired power plant.The solar electricity conversion efficiency in the integrated system is much higher than that in the solar thermal power generation system.Since the solar collector field is introduced into the coal-fired power plant

the electricity production cost of the integrated system in fuel-saving mode and power boosting mode is improved by 17.54yuan/(MW·h)and 16.86yuan/(MW·h)

respectively.