Realization And Optimization Of Bionic-sunflower Tracking Technology

With the development of industrialization, the energy demand of human beings increase rapidly. Developing renewable energy becomes extremely urgent as the traditional fossil sources will be exhausted soon. Among all the renewable energy, solar energy comes at the top of the list due to its evenly distribution in nature, abundance and environmentally friendly. The study of sun-tracking system is very important because their ues can boost electrical gain of solar systems.Features of existing sun-tracking technologies have been presented in this article, especially the Bionic Sunflower Tracking Technology( BSTT). BSTT has the advantages of modular design, flexible tracking accuracy and low energy consumption. The simulation analysis,system development and experimental study has been carried out in this article based on BSTT.Firstly, the principle of BSTT has been presented, then the Simplified Parallel Two Axises Sun-tracking Model(SPTASM) has been set up based on street lamp application. Key parameters including tracking range, tracking accuracy have been set based on sun’s orbit and irradiance model. A deformed shape and stress analysis of SPTASM has been carried out in this work; a displacement ratio range has been get according to the deformed shape analysis; the stress analysis shows that the mechanical system could withstand strain caused by deformation.There are two parts for Simplified Parallel Two Axises Sun-tracking System(SPTASS): mechanical structure and controller. The mechanical structure which includes sensor and driver has been built baed on modular design; the modular sensor can simplify installation and manufacture process according to put two axises’ sensors together; modular driver can boost its reliability by using overtravel-limit switch. Controller contains electronic circuit and programming; there are four parts for electronic circuit: MSP430F149 microcontroller minimum system, singnal collector, motor controller and JTAG. Working in daytime while rest in night has been achieved by built software which contains four essential parts: signal collecting, status judging, sleep and tracking.The experimental study has been done both indoor and outdoor. Indoor experiment contains lifespan test, point accurate test and tracking speed test. Outdoor experiment contains tracking performance test and power improve performance test. Pointing accuracy has been worked out in tracking performance test. By comparing the PV system with tracking device and fixed PV system, the test of generating speed, generating capacity and percentage of generating improvement has been finished.