Research On Distributed Photovoltaic Power Generation System And Grid Connection

Under the background of economic globalization and the rapid development of science and technology,energy problem has become a world difficult problem to break through the current situation and seek further development.At the same time,the global population is still on the rise,and the consumption of non-renewable resources such as coal,oil and natural gas is also increasing.Environmental problems(Climate Warming,El Nio Phenomenon,etc.)are aggravated by various factors.Therefore,countries around the world attach great importance to the development and effective use of renewable and clean energy,which has become their common development goal.Among them,solar energy,which has great potential in use,has gradually attracted people’s attention.In the field of photovoltaic power generation,scholars from various countries have conducted in-depth research in order to realize the development of green energy.Based on the practical problems of energy,this paper takes distributed photovoltaic power generation as the research topic,and makes research and exploration for it.Firstly,this paper introduces the background and significance of distributed photovoltaic power generation,the development status at home and abroad and the research content,which lays the foundation for the following development.Subsequently,the related theory of distributed photovoltaic power generation system is studied,in which the composition,advantages,grid-connected inverter system and control mode of distributed photovoltaic power generation system are explained,which lays a theoretical foundation for the follow-up study of the subject.Thereafter,photovoltaic cells and maximum power tracking algorithms are studied,and an improved disturbance observation method based on previous theories is proposed.Based on the previous research and analysis,this paper further studies the photovoltaic grid-connected power generation,and explores the photovoltaic grid-connected power generation system from the aspects of grid-connected technical requirements,system structure and grid-connected filter.Subsequently,related research on grid-connected photovoltaic inverters is carried out.In this paper,a PI cascade quasi-resonant PR controller is proposed,the relevant model is established,and then the grid-connected photovoltaic inverters are completed.Design of Control Part.The last part of the paper is the simulation experiment,which verifies the rationality of the design of grid-connected photovoltaic inverters,and can be further promoted in production practice.