Solar thermal power generation technology is an important way of efficient utilization of solar energy due to its stable energy output and can be used for peak regulation of power grid. Solar tower power generation with high collection and storage temperature has high power generation efficiency and great development potential.However

due to the influence of cosine efficiency

the optical efficiency of the heliostat field will decrease when the capacity exceeds a certain limit. On the contrary

the field efficiency of the trough collector is not affected by cosine efficiency and is independent of capacity. Therefore

a method of coupling tower and trough collector is proposed to improve the efficiency. MATLAB software is used to simulate and study the optical efficiency of the 100 MW tower slot coupling solar thermal power generation system. The results show that

the average annual optical efficiency of the coupling system can reach 50.65% under the condition of constant total heat collection

which is 3.04 percentage points higher than that of single tower system. When the tower height is 260 m

the optical efficiency of the coupling system is 2.52 percentage points higher than that of 180 m

and the ratio of heliostat field area to parabolic trough collector area decreases from 2.35 to 2.22. According to the tower slot coupling system with different latitudes and capacities

the variation regulation of the optical efficiency of the heliostat field is analyzed

and the application range of the tower slot coupling system is proposed

which is expected to provide reference for the design of new solar thermal power generation system.