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Study on a Tracking Control System for Tower Heliostats

Author: MaJianHua
Tutor: PanYuLiang
School: Hangzhou University of Electronic Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: Solar Photoelectric sensors MCU Photodetector Heliostat
CLC: TK513.4
Type: Master's thesis
Year: 2011
Downloads: 126
Quote: 1
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Abstract

With the rapid development of economy, energy shortages and the attendant problem of environmental pollution is growing, the growing emphasis on the development and utilization of new energy and renewable energy as an ideal, the use of solar energy concern in recent years, countries around the world are actively developing solar energy. Since this solar energy utilization efficiency is low, the affect and hinder the popularity of solar technology, while to achieve precise tracking of the sun, and thus improve the thermal efficiency of the receiver, in order to achieve the purpose to improve the efficiency of solar energy utilization of such respect can promote the popularization and utilization of solar energy solve the energy shortage problem, not cause environmental pollution brought to the benefit of mankind. Foregoing reasons, this paper focuses on a systematic study of the solar tracking technology. Sun-tracking methods are mainly two kinds of optical tracking, and as the day trajectory tracking. The conclusion is that the system using a combination of two tracking methods to achieve accurate tracking of the sun both tracking method. When the sun light intensity of optical tracking requirements, the system uses optical tracking mode, or depending on the day trajectory tracking. If clouds block the sun suddenly appeared in the sunny optical tracking system can automatically switch as the day trajectory tracking; when the sun's rays intensity and the requirements of the optical tracking system and then switch to optical tracking, in order to achieve the sun weather automatic tracking. Firstly, the sun angle and declination angle, sun elevation angle and azimuth heliostat high angle and azimuth Theoretical analysis and calculation as a basis for a design based on the measurement accuracy of the position of the sun is high, stable good photoelectric sensor. In accordance with the requirements of the control system, the paper used C8051F020 microcontroller as the core of the control system, with reference to the characteristics of the microcontroller and required to achieve to complete the microcontroller peripheral hardware circuit design and the software design. The paper describes in detail the function of an important device in the system that can be achieved, and design the hardware interface circuit, including light intensity detection circuit, a clock circuit, display circuit, data storage circuit, motor control circuit. According to the needs of the design features, the main program module of the system, depending on the date of the trajectory tracking module the optical tracking module, clock module, as well as other relevant functional modules of the software design work. Through the effective combination of hardware and software, the tracking control system can achieve high accuracy and good stability. By the hardware and software debug and verify tower heliostat tracking control system hardware and software design is practicable, the tracking control system has a simple structure, reasonable design, smooth running and tracking and high accuracy can be achieved on The sun high precision, all-weather track, thereby improving the efficiency of the use of solar energy, to lay the foundation for the popularization and utilization of solar energy.

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CLC: > Industrial Technology > Energy and Power Engineering > Special heat and its mechanical > Solar Energy Technology > Solar energy conversion devices and equipment > Tracking device
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