| Solar concentrating power generation system is the combination of solar tracking system and optical equipment,to use Principles of optics gather the sunlight to a small collector,and then take a heat source to the traditional power generation system.Based on the difference in the form of condenser,the main categories can be divided into tower condenser,disc condenser,slot condenser and linear Fresnel-type condenser system Linear Fresnel-type condenser power generation system is a new generation of potential power generation technology,because of its simple structure,low cost,wind safety capacity,high land use characteristics,in a wide range of power generation will have a good Application prospects.Linear Fresnel mirror tracking is different from a single solar panel and the entire mirror in the various parameters directly or indirectly affect the number of tracking and receiving the solar radiation.In this paper,we focus on the optimization of the non-shadow arrangement of the linear Fresnel mirror field,the vector optimization calculation of the tracking angle of the mirror field,the height of the control angle of the mirror field,the reflection of the primary mirror to the CPC rate,Fresnel tracking system hardware structure,the use of the field of Fresnel software system structure.Firstly,a scheme is proposed to optimize the arrangement of the mirror field.The calculation method is given and the numerical analysis is given.Then,the calculation method of the inclination angle of the mirror is deduced by the vector decomposition method.The calculation formula of the tilt angle of the mirror is deduced.It is concluded that the inclination error of the mirror element has a great influence on the light entering the condenser.Then,the optimization range of the linear Fresnel mirror angle is obtained by MATLAB simulation.On this basis,a reflection of the reflected light into the CPC rate test,and the tested results show that the accuracy of the calculation of the tilt of the mirror and the height of the control play a key in the whole linear Fresnel mirror tracking system.In the fourth chapter,the hardware structure of the linear Fresnel mirror tracking system is introduced.The first part is optimized on the main control unit,and it changes the single-chip to PLC.The single-chip microcomputer being the main control unit in the Fresnel mirror tracking system is relatively high to program,and is generally compiled by the sellerafter the direct buying back,but the PLC is relatively easy to get started,and can be based on the needs of the mirror real-time procedures for compensation.The drive unit is replaced by a conventional motor into a digitally controlled stepper motor and is equipped with a drive control circuit consisting of the AT89C2051 microcontroller and the L293 D power amplifier.The reducer uses a harmonic reducer that is now in a hot state.At the end of the paper,the paper introduces the software part and the practical case of the linear Fresnel mirror tracking system.The first is the preparation of the main program,which can be divided into two small subroutines,one is based on the sun position astronomical parameters and formulas,Height angle and azimuth of the exact calculation;the other is the calculation of stepper motor pulse.In summary,in strict accordance with the corresponding sun astronomical position parameters and formula programming calculate the sun height angle and azimuth,and the completion of the calculation of the tilt of the mirror.And then the stepper motor drives control circuit to send the corresponding signals to the motor controlling mirror real-time to track the sun.All in all,from the current level of linear Fresnel concentrating power generation technology,the tracking control can be more accurate track,and easy cleaning and maintenance. |
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