Design And Study Of The Electro Hydraulic Control System For The Solar Heat Collection Device Of Trough Solar Power Station

With economic development and social progress, people's demand of energy is more and more. Development and utilization of renewable energy become the best choice. Solar energy takes an important role in renewable energy research and development for its clean, high efficiency and broad prospects. Trough solar thermal power generation technology is mature, which have achieved commercial operations in the developed countries. A lot of research works, which realize nationalization of solar energy equipment, have been done in China.Electro-hydraulic control system has been widely used in many areas for its characteristics of high response ability, high power and high control precision. The problem of the electro-hydraulic control technology application in the trough solar thermal power is researched in this thesis. Then the sun-tracking method of solar heat collection device is improved.Based on the analysis of movement characteristics of solar heat collection device of trough solar power station, electro-hydraulic control system has finished. First, structural analysis of solar heat collection device,design of the hydraulic system and analysis in AMEsim have been achieved in this paper. After comparison of sun-tracking methods, an improved sun-tracking method has been proposed. Then, according to the planning control function of the system, controller's modular hardware and a sun-tracking sensor with the active searching function have been designed. It makes the motion relative separation between solar heat collection device and the sensor. Real-time tracking is carried out by the solar sensor. According to the feedback error comes from the sensor, the electro-hydraulic actuator adjusts the position of whole solar heat collection device, which makes it easy to improve control accuracy. Function modules of the control system software, such as signal processing, hydraulic servo driver module, sun-tracking strategies, have been completed in the MPLAB IDE. Finally, debugging, software simulation and experimental verification are carried out, and the experiment results are provided to show the success of the electro-hydraulic control system and photoelectric sensor.