Design Of A 200MW Photovoltaic Access System Project In Xingning,Guangdong

With the increasingly serious impact of global warming,countries around the world are actively taking measures to reduce the consumption and dependence of non renewable energy such as oil and coal in energy production,so as to alleviate the global warming and air pollution caused by the use of oil and coal.Therefore,energy transformation has become a global development trend.The development of sustainable low-carbon clean energy supply system such as distributed photovoltaic solar energy is an important direction in the global energy field.After the removal of Xingda power plant of Huaneng Group in 2014,Xingning power grid at the end of the power grid has no main power supply.With the rapid development of the load in Xingning area,the power gap is becoming larger and larger.However,Xingning area is rich in solar energy resources,so it is urgent to make use of local sufficient solar energy resources for power supply supplement.The 200 MW photovoltaic power generation project in this paper came into being.The main contents of this paper are as follows:Firstly,it analyzes the background and significance of the development of new photovoltaic energy,and introduces the development of distributed photovoltaic power generation at home and abroad.Secondly,carry out the demand analysis and overall scheme design of the project.Based on the current situation and load situation of Xingning power grid,the power balance calculation and the analysis of solar energy resources in the station area are carried out,and it is found that the photovoltaic energy in Xingning area can meet the future load gap.Therefore,the overall scheme design of photovoltaic power station,110 k V booster station and grid connection access line is carried out.Thirdly,design 200 MW photovoltaic access system.The design of 200 MW photovoltaic access system is carried out.The basic data are obtained through the calculation and analysis of the power flow of Xingning power grid,the calculation of the short-circuit current level and the prediction of the power generation capacity of the photovoltaic power generation project.According to the calculation results,the design of the electrical primary,electrical secondary,communication and overhead power collection lines is carried out.This paper mainly designs the selection of grid connected parts,photovoltaic array operation mode,inverter selection,photovoltaic power generation unit,electrical main wiring,dispatching automation system,relay protection and automatic device,communication automation,overhead power collection line and so on.Fourth,the simulation and benefit analysis of 200 MW photovoltaic project.In this paper,pvsyst software is used to simulate,through the simulation of different tilt angles of photovoltaic matrix,the optimal tilt angle is determined to be 15 °;the simulation results show that the annual average power generation of the project is 236426mwh;finally,the benefit analysis of the project shows that the project can recover the cost within 5 years,and the profit is rich.The design of the 200 MW photovoltaic access system project determines the main components of the photovoltaic power station(such as photovoltaic module model,matrix operation mode,inverter combination,booster station main transformer,etc.),which can be used as the supporting technical documents for the project construction;after the 200 MW photovoltaic project is connected to Xingning grid,it can not only solve the future load gap of the grid,but also bring considerable economic benefits to the owner It has also achieved energy conservation and emission reduction and multiple benefits of energy,economy and environmental protection.