A sun-tracking system for parabolic trough solar concentrators (PTCs) is a control system used to orient the\nconcentrator toward the sun always, so that the maximum energy can be collected. The work presented here is a\ndesign and development of PLC based sun tracking control system for PTC. Sun tracking control system consists of a\nProgrammable Logic Controller (PLC) and a single axis hydraulic drives tracking control system. Hydraulic drives\nand the necessary tracking angle algorithm have been designed and developed to perform the technical tasks. A PLC\nunit was employed to control and monitor the mechanical movement of the PTC and to collect and store data related\nto the tracking angle of PTC. It is found that the tracking error of the system is less than 0.6 �°. Field experience shows\nthat tracking algorithm act stable and reliable and suit for PTCs.
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