Method for controlling heliostat used for condensing of sunlight and device thereof

Abstract

Provided are a method for controlling a heliostat used for collecting of sunlight and a device of the method that achieve: a high sunlight collecting efficiency with a high light collecting rate by allowing no deviation of a light collecting point (a focal point) of sunlight; and a high area arrangement efficiency by having such a configuration in which no rotation by means of a rotation mechanism is carried out. The method is a method for controlling a heliostat being used for collecting of sunlight and having multiple reflecting mirrors in a way that the heliostat tracks the sun in motion, reflects sunlight, and collects the sunlight at a predetermined focal point. The method includes: a step of adjusting the multiple reflecting mirrors so that the multiple reflecting mirrors have a focal point at a predetermined distance; and a step of controlling the multiple reflecting mirrors to track the sun while light beams reflected from the reflecting mirrors have a focal point at an arbitrary point, the multiple reflecting mirrors being configured to tilt in conjunction with each other. In the method, while maintaining a state where the coordinates of predetermined points of the respective reflecting mirrors are fixed, the reflecting mirrors are operated in conjunction with each other.

1 . A method for controlling a heliostat, which is used for collecting of sunlight and has a plurality of reflecting mirrors, in a way that the heliostat tracks the sun in motion, reflects sunlight, and collects the sunlight at a predetermined focal point, the method characterized by comprising the steps of:
 adjusting the plurality of reflecting mirrors so that the plurality of reflecting mirrors have a focal point at a predetermined distance; and   controlling the plurality of reflecting mirrors so that the plurality of reflecting mirrors track the sun and light beams reflected from the respective reflecting mirrors have a focal point at an arbitrary point, the plurality of reflecting mirrors being configured to tilt in conjunction with each other, the method characterized in that   the reflecting mirrors are operated in conjunction with each other while maintaining a state where coordinates of predetermined points of the respective reflecting mirrors are fixed.   
     
     
         2 . The method for controlling a heliostat according to  claim 1 , characterized in that the reflecting mirrors are operated in conjunction with each other while maintaining a state where coordinates of centers of the respective reflecting mirrors are fixed. 
     
     
         3 . The method for controlling a heliostat according to  claim 1 , characterized in that a focal point formed by the plurality of reflecting mirrors moves on a celestial sphere surface having an arbitrary radius in such a way to prevent comatic aberration. 
     
     
         4 . The method for controlling a heliostat according to  claim 1 , characterized in that directions of the plurality of reflecting mirrors are controlled in conjunction with each other by two different link mechanisms. 
     
     
         5 . A heliostat used for collecting of sunlight and configured to arrange a plurality of reflecting mirrors therein in such a way that the plurality of reflecting mirrors have a focal point, the heliostat characterized in that:
 the plurality of reflecting mirrors are mounted on pedestals with tilting mechanisms in between, respectively; the plurality of tilting mechanisms are connected to each other by a first axis link and a second axis link which are directed in two different directions; and   the plurality of tilting mechanisms change an orientation in conjunction with each other by the links.   
     
     
         6 . The heliostat according to  claim 5 , characterized in that:
 the first axis link and the second axis link are rod-shaped links, are provided in directions orthogonal to each other, and are connected to respective driving devices; and   the driving devices are controlled so as to configure that a position of a focal point of the plurality of reflecting mirrors is movable through the respective links and the respective tilting mechanisms.   
     
     
         7 . A solar thermal power generation plant, characterized by comprising a plurality of heliostats according to  claim 5 , characterized in that sunlight is collected at a heat receiving part using a molten salt as a heat medium so as to carry out solar thermal power generation.