Design Of 300 MWp Photovoltaic Energy Storage Integrated Power Generation System In Huachi County Of Qingyang City

In today’s society,with the continuous growth of energy demand,the consumption of fossil fuels is increasing,and the problem of environmental pollution is becoming increasingly serious.Energy issues have become a global problem that countries urgently need to solve.Photovoltaic power generation is a representative type of clean energy,which not only solves the problem of energy shortage but also does not cause pollution to the environment.The construction projects of photovoltaic power stations in China have been carried out nationwide,and the newly added installed capacity of photovoltaics has consistently ranked first in the world for ten consecutive years.As a province with abundant solar energy in China,Gansu Province meets the needs of photovoltaic power station construction.In order to better meet local electricity demand,achieve complementary power transmission from the west to the east,and align with national strategies,and complete national plans such as carbon compliance,the design of a local 300 MWp photovoltaic power station was carried out in Huachi County,Qingyang City,Gansu Province as the research object.Firstly,an overview and analysis were conducted on the current situation of solar energy resources and power grids in the region.This article elaborates on the richness of solar energy resources in Huachi County,Qingyang City,and proves that it was suitable for the construction of large-scale photovoltaic power stations.After comprehensive analysis combined with environmental resources,geographical conditions,and power grid structure,the capacity of the photovoltaic power plant was determined to be 300 MWp.Secondly,the photovoltaic module system was designed,using the most cost-effective single crystal silicon module.The layout,operation,and spacing of the photovoltaic array were designed,and the simulation results of the photovoltaic module tilt angle were compared using PVsyst software to obtain the optimal tilt angle.We had calculated the power generation of the photovoltaic power station in the first year and predicted the average power generation in the next 25 years.Subsequently,the primary electrical system design was carried out for the boost station section of the photovoltaic power plant,including the selection of the main electrical wiring scheme.The selection and calibration of equipment were determined through power flow calculation and short-circuit current calculation,and overvoltage protection and grounding measures for primary equipment were established.Subsequently,with the goal of achieving safe and intelligent stable operation of the booster station,the design of the electrical secondary system was mainly focused on relay protection,safety automatic devices,computer monitoring and communication,peak shaving and frequency regulation,and control power supply systems.We had established remote control and scheduling automation configurations for photovoltaic power stations,as well as supporting communication functions,to achieve the "four remotes" function between the photovoltaic power station and the booster station.Finally,simulation design and validation were conducted on the MATLAB/Simulink platform.And simulate and verify the photovoltaic cell at a given temperature,and it can output full power under a given irradiance;The energy storage battery continuously outputs power at the design value,and operates normally throughout its entire cycle to meet the input requirements;Maximum power point tracking(MPPT)was used to achieve the highest working efficiency of photovoltaic cells,so that the output power and outlet voltage of the inverter can be kept stable,while the output current also meets the design requirements,the maximum distortion rate of its harmonics was within the allowable range,and the frequency fluctuation meets the grid connection requirements during full load grid connected operation;Under the normal power generation of the power generation system module,the output voltage,current,frequency,power,and harmonics were analyzed,and it was found that the harmonic distortion rate,frequency,and other electrical energy indicators of the photovoltaic power generation system at full load meet the requirements for grid connection.