Research On Maximum Power Point Tracking And Solar Position Tracking Technology For Photovoltaic Power Generation System

With the extensive use of fossil energy,the disadvantages of over-exploitation of energy and serious impact on the environment gradually emerged.Therefore,countries began to focus on cleaner and sustainable use of new energy.Among them,solar energy as a green energy has been widely concerned and used,and the photovoltaic industry has also been paid attention to and developed worldwide.However,there are still low efficiency of photovoltaic power generation and low utilization rate of solar energy,so this paper carries out research on this.Based on the current development of photovoltaic Power generation,this paper introduces the development status of Maximum Power Point Tracking(MPPT)and solar azimuth tracking technology involved respectively.Finally,the solar cell model is constructed,and the model construction under different foundation is proposed respectively,and the U-I and P-U characteristic curves of the battery under different external environmental conditions are simulated for correlation analysis.In terms of maximum power point tracking,this paper selects the traditional perturbation observation method which is more suitable for the purpose of this study and optimizes it by taking the MPPT algorithm which is more common now and making analysis and comparison.The simulation results show that the optimized variable step size perturbation observation method has more advantages than the traditional method in tracking speed and stability of the maximum power point.In terms of solar azimuth tracking,this paper chooses to use the photoelectric sensor tracking method under the celestial equator coordinate system to design the system,introduce and analyze the hardware and software of the whole system,and use the experimental data of uniaxial tracking to prove that the physical light tracking experimental platform built by this design can achieve a good sunlight tracking effect.The utility and practicability of the light tracking method are verified.Through the research and design of this paper,the overall optimization of the efficiency of the photovoltaic power generation system is completed from the two technical aspects of MPPT and light tracking.The light tracking system can improve the reasonable utilization of light energy of the photovoltaic system and improve the efficiency of energy utilization.The MPPT can effectively improve the operation stability of the photovoltaic power generation system and the speed of tracking effective working points.It is verified that these two technologies can effectively improve the efficiency and stability of photovoltaic power generation system.