Design Of 120 MWp Photovoltaic Power Station In Gonghe County,Qinghai Province

The excessive exploitation and use of fossil energy has caused a series of problems,including energy crisis,climate warming and environmental pollution.Actively developing and utilizing clean and renewable energy sources has become the primary choice to solve these problems.Solar energy,as a low-cost,easily accessible,pollution-free renewable and clean energy,is favored by countries around the world.Photovoltaic industry in China is developing rapidly,especially in the"difference"plan carbon peak,carbon and the national level strategic planning,positive response across the country,accelerate the pace of photovoltaic resources development and utilization,constantly improve the new energy in the current national energy structure,actively promote the energy structure optimization.With the background of the 14th Five-Year Plan and Hainan Prefecture of Qinghai Province as the research object,this paper carries out the design of 120MWp centralized grid-connected photovoltaic power station.First of all,this paper on the solar energy resources,meteorological conditions,geographical environment,power grid structure,the site is grassland or semi-desert grassland,average annual solar radiation is 6553.41MJ/m~2,solar"most abundant"area,combined with the local power system current situation and development planning,the construction of photovoltaic power station conforms to the local development demand.Secondly,through technical comparison and economic analysis,choose single crystal double-sided 530 Wp photovoltaic modules,through PVsyst software simulation,determine the photovoltaic panel economic efficiency fixed adjustable installation way,and get the best tilt Angle,calculate the square array spacing,series and parallel design of the overall scheme.Compared with different schemes,centralized inverter and junction box are selected,and various losses in the power generation process are analyzed according to the design scheme,and the power generation in the next 25 years is predicted.Finally,carry out the electrical part design of photovoltaic power station.The design part of the first part includes the main connection mode and overall structure of the photovoltaic power station,the selection and verification of electrical equipment and cables,the design of power consumption mode,overvoltage protection and grounding through power current calculation and short circuit calculation.The secondary part is mainly designed from four aspects:relay protection,DC power supply,equipment monitoring and communication scheme.After simulation and verification by MATLAB/Simulink software,the PV cell can provide full power output under the given field conditions;the maximum power output through MPPT control;the voltage,frequency and waveform of the centralized inverter meet the national standards and design requirements..