Influence Of Distributed PV On Power Loss In Distribution Grid And Its Countermeasures

In recent years,photovoltaic industry at home and abroad has made substantial progress.Distributed photovoltaic power generation has the advantages of environmental friendliness,less investment,short construction period,less floor space and regional limitations,etc.It has developed rapidly.At the same time,in order to absorb the overcapacity caused by the development of the European and American Anti-Japanese and domestic photovoltaic industries,a large number of distributed photovoltaic poverty alleviation projects have emerged in China.After the distributed photovoltaic grid connection,it is beneficial to realize the in-situ energy balance and has a positive influence on improving the voltage quality of distribution networks in remote areas.However,at the same time,distributed photovoltaic grid-connected changes the power grid from a single power supply structure to a multi-power supply structure,which is prone to reverse flow of power flow,causing transformer loads in substations to fluctuate greatly,which has a greater impact on the economic operation of the distribution network.In this paper,the main factors affecting the loss of each component are analyzed,and the influence of distributed photovoltaic grid connection on the main factors is determined,and the variation law of these factors with distributed photovoltaic access is analyzed.The influence of distributed photovoltaic access on distribution network loss is summed up.Secondly,combined with the research conclusion of network loss impact analysis,this paper analyzes and determines the method to reduce the loss of distributed photovoltaic grid-connected distribution network,adjusts the above factors from the technical and economic means,realizes the loss reduction of distribution network,and gives the optimization scheme of distributed photovoltaic rid-connected and operation.Finally,combined with practical cases,this paper discusses the loss changes caused by lOkV and 220V distributed photovoltaic grid connection,analyzes the loss changes,demonstrates the economy of the access scheme,and formulates corresponding technical and economic measures to optimize the grid connection and operation of distributed photovoltaic.