The Influence Of Distributed Power Grid-connection On Steady State Operation Of Distribution Network

Along with the rapid development of science and technology,people’s demand for energy in a straight line rise,photovoltaic power generation systems because of its advantages of clean,economic,sustainable,has attracted extensive attention from all walks of life,in the scale of the expected future distributed photovoltaic power generation will be more wide,but in practice,because of distributed photovoltaic(pv)power supply access based configuration of low voltage distribution network in the 10 kV and below is not high,given the limited capacity,this kind of its small volume,randomness,unstable also brings to the low voltage distribution network in the 10 kV and below the voltage distribution,economy to reduce operation and maintenance difficulty increases and a series of problems that influence the reliability of.Only by studying the influence of the grid-connected photovoltaic power generation system on the reliability of power supply in the steady-state power network,can photovoltaic power generation replace traditional fossil energy power generation and realize the high-density access to the grid of photovoltaic energy.In this paper,two key points,voltage distribution and power loss,are selected.Starting from the theoretical direction,the voltage drop calculation before and after the photovoltaic power generation system is connected to the power network and the voltage distribution situation of the distribution network are analyzed.Meanwhile,the network loss of the distribution network is theoretically calculated and analyzed to obtain the results of theoretical analysis.Then,combined with the application of distributed photovoltaic power supply in Songyuan,Jilin Province,the paper analyzed the four grid-connected modes of photovoltaic system into the power grid and the applicable scope of various grid-connected modes.At the same time,the simulation modeling was carried out for photovoltaic system access,and the parameters of the simulation model were set according to the actual situation on the site.In the simulation platform,the voltage distribution and power loss are two key points.The influence of the photovoltaic system on the steady-state power network under different positions,capacities and operation modes in the distribution network is simulated,and the correctness of the previous theoretical analysis results is verified.,through the analysis of the research results can provide the dispatching control department with photovoltaic(pv)grid power network operation after the data change and the methods to deal with,effectively solve the problem of the impact of the photovoltaic(pv)grid on the grid system in order to reduce the voltage fluctuations,effectively solve the problem of tide fluctuation of power grid in order to reduce network losses,effectively solve the grid compatibility issues to increase the system’s ability to accept photovoltaic(pv),and promote the network layout optimization level,promote clean energy given level.