Baixiang Research And Design Of 12MW Roof Photovoltaic PV Grid Power Generation Project

With the rapid economic and social development,energy demand is also rising.Relative to the coal,oil and other non-renewable resources,the development of new energy sources become an important trend,green,clean,renewable as an important development goals and requirements.The application of photovoltaic power generation can not only ease China's energy crisis but also reduce the environmental pollution in our country,and has a wide range of application prospects.At present,with a large number of generation using the traditional way of grid-connected,resulting in the lack of inertia of the system,reducing the stability of the system,this paper adopts the virtual synchronous motor way and grid,the main contents of this paper include:(1)The principle of photovoltaic grid-connected,the working principle of photovoltaic cells and the basic characteristics are introduced,and the influence of light intensity and temperature on the output current and power is obtained.Then,the overall structure of photovoltaic power generation is designed.Based on this,the maximum power tracking method of photovoltaic power generation in the grid is studied.At the same time,MATLAB is used to simulate the commonly used MPPT method.(2)Designing the hardware,software and monitoring equipment of the photovoltaic power generation system designed in this paper.The hardware design mainly includes the DC voltage sampling circuit,AC voltage sampling circuit,control power supply current,etc.The software design mainly includes the main program design,interrupt Service design and virtual synchronous motor algorithm design,and finally configure the appropriate monitoring equipment to achieve the full functionality of photovoltaic power generation.(3)The electrical design of photovoltaic power station and the selection of the main equipment in the system according to the specific design to complete the electrical design of the entire photovoltaic power station.Finally,the actual operating results show that the voltage and current waveforms after the grid connection are smoother,meanwhile,the output harmonic of the inverter is smaller and the voltage flicker value is lower,which is in line with the related grid-connected specifications.