Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol. 4, No. 1, March 2016, pp. 54~64 ISSN: 2089-3272, DOI: 10.11591/ijeei.v4i1.187  54 Received August 27, 2015; Revised January 6, 2016; Accepted January 18, 2016 Two Axes Sun Tracking System for Heliostat in Algeria Mihoub Sofiane*, Ali Chermitti** * Research Unit Materials and Renewable Energies (URMER), AbouBakr Belkaid University -TLEMCEN- Teacher at university of BLIDA ** Research Unit Materials and Renewable Energies (URMER), AbouBakr Belkaid University -TLEMCEN- e-mail: mihoubsofiane@yahoo.fr Abstract In this paper, using Proteus software, sun tracking system with two axes program has developed and simulated for site of GHARDAIA, in the south of ALGERIA. Two direct current motors have used to move heliostat in North–South and East–West axis polar, in order to tracking the sun path.In addition, the distinction between day and night has provided by light dependent resistor (LDR).An algorithm of two axes sun tracking system hab developed and simulated under Proteus software, after DC motor’s parameters have verified and simulated under MATLAB software. The results show that: in the first, the development of the heliostat control requires the knowledge of the position of each heliostat relative to the tower to ensure the proper operation of the motors, and the uniformity of the reflected beam to the target.Then the choice of the drive motors is based on the useful power, including the weight of the heliostat, and all efforts affects on operation of motors in different seasons of the year, like the wind.And The position of the heliostat depends of chopper duty cycle.Finally,Conducting a power tower with mobile heliostats requires a techno-economic study on all components (heliostats, tower...) of the plant, for example weather two motors for each heliostat field. Keywords: Sun tracking system, Heliostat, DC motor, Proteus software 1. Introduction The question of global demand that growing up, specifically for clean energy, climate changes and sustainable development has a large importance in the programs of development in Algeria. This leans the Algerian governments to launch the renewable energies (REs) and energy efficiency program. Solar energy occupies one of the most important places among the various possible alternative energy sources for both urban and rural areas [1], and the strategic choice of this program is motivated by the huge potential of solar energy; in which it is the top source in the Mediterranean basin; more than 2,000,000 km 2 receives yearly a sunshine exposure equivalent to 2500 kWh/m 2 and the mean yearly sunshine duration varies from a low value of 2650 h on the coastal line to 3500 h in the south. This energy is the major focus of the program of which concentrating solar thermal power (CSP) and photovoltaic systems (CPV) constitute an essential part. Solar should achieve more than 37% of national electricity production by 2030 [1, 2]. In general, the power developed in such applications depends fundamentally upon the amount of solar energy captured by the collector, and thus the problem of developing tracking schemes capable of following the trajectory of the sun throughout the course of the day on a year-round basis has received significant coverage in the literature. For example, various schemes have been proposed for optimizing the tilt angle and orientation of solar collectors designed for different geographical latitudes or possible utilization periods [3-4]. A heliostat is a device that automatically tracks the sun as it moves across the sky and constantly reflects the sunlight to a fixed location, typically a thermal collector. For a large scale solar collection system such as a central receiver system, heliostats are essential. In a central receive system; a number of heliostats are employed to reflect sunlight to a single central receiver. Total solar energy is directly proportional to the area of solar intake, the aperture of the system. Thus, the energy is related to the number of heliostats and their reflective area. Working temperature of the receiver, however, related to the system concentration ratio, the ratio of the receiver area to the aperture area. If flat reflective surfaces are used by the heliostats, this concentration ratio is directly proportional to the number of heliostats employed.