Control System Design Of Sun Tracking Systemin Thetower Solar Thermal Power Plant

Due to the over exploitation and consumption of non renewable energy resources,the earth’s climate and environment are getting worse and worse.Many species are extinct,and energy is also going to be exhausted.Therefore,renewable energy is becoming more and more popular all over the world.The tower solar thermal power technology is a leader in renewable energy.It has many advantages,such as unlimited energy storage,high operation temperature and High collector efficiency.It is widely recognized as one of the most effective ways to solve the current crisis.This paper focuses on the research of tower solar tracker,the key elements of the work are summarized as follows:First of all,to understand the characteristics and advantages of solar power generation,the common three kinds of solar thermal power generation are compared.The movement rule of the sun is expounded,and the motion relation between the sun and the earth is deeply understood.Then three kinds of coordinate systems for determining the solar position are put forward,and then the best choice is made after comparison.On the basis of two common tracking methods,a tracking scheme combined with day tracking and sensor tracking is proposed.Secondly,the tracking system of the design of the hardware components are introduced,including the selection of controller,motor and feedback module etc..At the same time,the hardware driver needs to be based on the software,the related signal also requires the controller and internal data acquisition program,data processing and analysis,the heliostat is able to accurately and stably track the sun also depends on the software framework and control algorithm is good.This chapter introduces the software design and algorithm flow tracking system in the position of the sun,including the main program module,manual mode and fast mode module algorithm.Thirdly,in the second chapter,based on the selection of the coordinate system,according to the relevant astronomy and mathematical algorithm,we set up the calculation model of the solar elevation angle and azimuth angle,and express the real location of the sun accurately in two angles.The establishment of the heliostat trajectory model,using the optical reflection principle in determining the position of the sun,a design calculation of the heliostat height angle and azimuth angle algorithm,so that the reflected light can always hit the receiver at the center.Finally,tracking system in order to verify whether the normal operation of the Matlab2015 a as the simulation platform,using the proposed control algorithm of the sun altitude angle and the azimuth angle of the sun,sunrise and sunset time,mirror field simulation and analysis of the opening time and the heliostat altitude angle and the azimuth angle of.The simulation results confirm the feasibility of the control strategy designed in this paper.