Development of full-automatic solar tracker and its applications

In order to realize accurate tracking the sun by a pyrheliometer,a full-automatic solar tracker has been developed.The tracker has two tracking modes,one is to calculate the sun moving and the other is to control the solar displacement.This paper introduces the principle of two tracking modes,and realizes the high-precision automatic sun tracking of all weather by switching automatically and cooperation with each other.The track error is within the rang of ±0.14°on the basis of experiments for 18 months.Putting pyrheliometer and pyrameter on the tracker,it can improve the measurement accuracies of direct radiation and total radiation,which solves signal wire of pyrheliometer intertwist and achieves full-automatic measurements of direct radiation,sunshine duration and diffusive radiation.