Research On The Influence Of Distributed Photovoltaic System On Regional Distribution Network

With the "double-carbon" goal,the development and utilization of renewable energy has become an inevitable trend.As an important form of energy utilization,new energy generation has attracted more and more attention.Compared with the centralized power generation mode of large capacity,high voltage and long-distance transmission,distributed photovoltaic is widely used because of its unique advantages such as small capacity,low voltage and local consumption.In recent years,it presents a leapfrog development trend.Systematically studying the influence of a large number of distributed photovoltaic access on the distribution network is of great significance for improving the power grid and personal safety.This paper studies the impact of distributed photovoltaic on the safety of distribution network with the research object of distributed photovoltaic bit combined with engineering examples.The main research contents of this paper are as follows:1.The principle,basic structure and output characteristics of distributed photovoltaic power generation are analyzed,which lays a foundation for the study on the influence of distributed photovoltaic on the distribution network.2.For distributed PV connected to the distribution network with T connection,this paper analyzes the threat of isolated island effect to the personal safety of the maintenance work of the distribution network,and puts forward the equipment operation and maintenance management measures of distributed PV connected to the distribution network,which can effectively reduce the maintenance risk of the "active" distribution network.3.In view of the impact of distributed photovoltaic access on the operation security of the distribution network,it is theoretically analyzed that distributed photovoltaic access will be conducive to improving the overall voltage of the distribution network,but distributed photovoltaic will have adverse effects on the volatility of the grid voltage and the correctness of current protection and reclosing action.4.Comprehensively considering thermal stability assessment,short-circuit current check,voltage deviation check and harmonic check,the calculation method and evaluation process of the bearing capacity of distributed photovoltaic power grid are sorted out,which provides a quantitative calculation method for ensuring the safe and stable operation of the distribution network after distributed photovoltaic access.5.Based on EXCEL-VBA,a practical and available calculation tool for distributed photovoltaic power grid bearing capacity was developed,and the effect was good after application in practical work.