Analysis Of Grid-connected Power Generation Quality Of Distributed Photovoltaic Generation In Rural Area Of Wu'an Power Grid

With the tremendous development of the national economy and industry,the national electricity consumption has also increased rapidly.At this stage,traditional non-renewable energy sources are facing exhaustion and certain defects in the power system.Distributed power sources have attracted the attention of many scholars at home and abroad because of their environmental protection and flexibility.Based on this,it is the main trend of future power system development that large-scale centralized power grids will distribute energy generation with grid-base new energy.However,with the large-scale distributed power grid connection,its penetration rate to the grid is increasing day by day,which brings many problems to the existing distribution network system.Among them,the issue of power quality is particularly acute.This paper is based on the distributed power supply grid connection in Hejin Town,Wu'an City,and studies the power quality problems that this photovoltaic power station brings.Firstly,the distributed power supply at home and abroad was analyzed to study the solar energy resources in Wu'an City.It showed that Wu'an City,Hebei Province has abundant solar energy resources.And I calculated and analyzed the total solar radiation by latitude and total radiation in the region.Then,the overall plan of photovoltaic power station in Hejin Town,Wu'an City was designed and the power generation amount was calculated.Various control methods for photovoltaic cells and photovoltaic inverters were also discussed.At the same time,it is analyzed that the connection of photovoltaic power stations in Wu'an City may have favorable and adverse effects on the power quality of the entire system,and the application of power electronic components will bring about new power quality problems.After analyzing the impact of distributed photovoltaic generation and grid connection on power quality,a theoretical analysis was conducted on the photovoltaic power station in Hejin Town,Wu'an City,and a PV grid-connected model was established to qualitatively analyze the influence of harmonics on the grid connection of photovoltaic power plants in Wu'an.Finally,the application of parallel APF to its photovoltaic power station in Wu'an City is analyzed.The data shows that this method can effectively improve the resonance of the harmonic current in the transmission and distribution system of the photovoltaic power station in Hejin Town,Wu'an City,and improve the power quality.