Research And Application Of Photovoltaic Grid-connected Power Generation System Based On MPPT

With the rapid development of the economy and society,energy demand is also constantly improving.Compared with the application of non-renewable resources such as coal and petroleum,the development of new energy has become an important trend.Green,clean and renewable have become important development goals and requirements.The application of photovoltaic power generation can not only alleviate China’s energy crisis,but also reduce environmental pollution in China,and has broad application prospects.In Liangshui area,the light resources are abundant.In order to alleviate the power supply pressure in this area,this paper designed a 50 MW agricultural photovoltaic photovoltaic power generation project in Liangshui Town.In this paper,the basic principle of photovoltaic power generation system is analyzed,and the output characteristics of photovoltaic array are studied by constructing a mathematical model of photovoltaic array,and the maximum power tracking method(Maximum Power Point Tracking,in grid-connected photovoltaic power generation is analyzed.Based on the basic theory of MPPT,a new maximum power tracking method is proposed to solve the existing problems of MPPT.Finally,MATLAB/SIMULINK is used to simulate the proposed method to verify the effectiveness of the proposed method.Then the photovoltaic access system The scheme is designed and selected from the aspects of power flow,power loss and reliability of power supply.Secondly,the neutral grounding mode is designed,and the access scheme of the whole photovoltaic substation is designed.Finally,the power quality of photovoltaic substation is evaluated and analyzed,and it is verified by calculation that the photovoltaic substation can provide stable and high quality electric energy after it is connected to the grid.In this paper,MPPT photovoltaic power generation system and grid-connected technology are realized,the consumption of fossil energy in Liangshui area is reduced,the clean energy is used effectively,the power supply pressure in this area is alleviated and the local ecological environment protection is greatly contributed.