Design And Analysis Of 20MW Photovoltaic Power Grid Connection Scheme In Dongping County

In recent years,with the depletion of fossil energy and the development of science and technology and the enhancement of people's environmental awareness,more and more new energy sources enter people's life.With the rapid development of distributed power generation technology in today's society,the network of distributed power supply is increasing.After the distributed power supply is connected to the power grid,the origina l grid structure has changed dramatically,which has brought a series of impacts to the operation and scheduling of the power grid.Due to the intermittent and volatility of distributed power supply,a large number of distributed power sources connected to the distribution network through inverters will have a significant impact on the power qualit y of the distribution network.In this paper,the definition of distributed power supply is briefly introduced,and the development status of the distribution network of county in China is analyzed,and the background and significance of the research are pointed out.Then several important forms of distributed power supply are introduced,and the influence of distributed power grid on grid dispatching and distribution network operation is briefly analyzed.The influence of distributed power grid on distribution network operation is discussed from three aspects: power transmission power,circuit voltage and power quality.The influence of the grid on the power quality of the grid is analyzed.At the end of the paper with a special access way of 20 mw photovoltaic power generation project network as an example,the design basis,design principle,the requirements of the grid technology are introduced,the photovoltaic power generatio n project take T connected to the substation power supply access way to link directly under the access way of combination of Dongping region of supply and demand situation,present situation and the load of power grid in power flow calculation,short circuit calculat io n,technical and economic analysis,relay protection system,dispatching automation system,communication system,etc,to carry out the feasibility analysis,to develop grid connection scheme,finally forming system construction plan.