Heliostat Autonomous Power Distribution And Wireless Networking Design

With the global energy resource reserve depleted at a high speed, new energy power generation technology becomes the key to human development, which contains solar power generation technology. Tower-solar thermal generation system provides a clean way of generating electricity with large scales. Solar power is constrainted using heliostats and then reflected with maximum efficiency. The absorbed solar energy is transformed to thermal energy to drive the generator to produce electricity. Heliostats play an important role in the solar energy system. The heliostat technology is one of the most important factors that restrict the improvement of concentration temperature, efficiency and scale. The upgrading of technology and the reduction of cost have become the competitive focus in the world.A new discrete-type tracing method is put forward based on the law of solar motion to ensure the power need of system stay low in this thesis. PV modules are used to meet the power need of two-axis motor of heliostats. Wireless technology based on ZigBee network is designed for the communication between the central controlling system and heliostats. The main work is as follows:Firstly, the law of solar motion is studied and the model of it is established to calculate the zenith and altitude of solar. Simulations of the angles on the equinoxes and solstices are run to summarize the rule of variety.Secondly, the main work of heliostats is reflecting sunlights to the receiver. According to law of solar motion, the rule of how heliostats reflect the sunlight is studied and tracing model is established. A batch-type rotation of the two-axis motor of heliostats is put forward in order to reduce the power need. Then the power requirement that heliostats work in low-power condition is analyzed and predicted.Thirdly, PV modules are designed to generate electricity to meet the power need of heliostats. The photoelectric conversion efficiency is determined by the photocoltaic materials.Different types of material are compared to select an appropriate one. The main factors which have influence on the output of PV modules are studied and the output model is established to simulate the power generated by PV modules. In consideration of power need of heliostats, the capacity of PV modules is designed. In order to reduce the impact on efficiency of heliostats,the distribution maps of heliostats efficiency are generated using the heliostats efficiency model.The several lowest efficiency positions of heliostats are found out to install PV modules.Lastly, the analyzation of wireless network. Wire communication technology is replaced by Wireless technology to control heliostats. According to the actual situation,the ZigBee network is simulated by OPNET to analyze the delay and through of date.