Simulation and optimization of a dual-axis solar tracking mechanism

Abstract

The work deals with the simulation and optimization of a tracking mechanism used to increase the efficiency of photovoltaic (PV) systems. The proposed solar tracker is one with two degrees of freedom (so called dual-axis, or bi-axial), of the equatorial/polar type. The actuation of the tracking system is carried out with two linear actuators, one for each of the two movements. The study is carried out using a virtual prototyping platform that integrates, into a mechatronic concept, the commercial software packages ADAMS and EASY5. The optimization process is approached from three points of view, which target the mechanical device, the control system, and the bi-axial tracking program. All these optimization processes positively influence, in a specific way, the energy efficiency of the tracking system, which was comprehensively evaluated considering the data specific to the longest light-day of the year (i.e., summer solstice), where a net energy gain of 58.66% (by reference to the equivalent fixed system) was obtained. Similar numerical simulations corresponding to several representative days of the year have revealed that the annual net energy gain is around 42%, which fully justifies the use of the proposed tracking system.