The Analysis Of Distributed Generation Connected To Grid Influence And Strategy Research

With the wide application of distributed power supply,more and more distributed power supply is connected to the power grid.However,the distributed power supply is random,it will produce harmonics through the inverter when it connected to the grid,and when a short circuit fault occurs on the line,the distributed power will inject a large current to the fault location,changing the magnitude and direction of the original power flow,and cause the malfunction of the protection.When a large number of distributed power grid connected to grid,the power flow of the network,power quality and the protection of the relay will have a serious impact.Aiming at the above problems,this paper takes the Zhanjiang power grid Jingke photovoltaic power station connected to Zhanjiang power grid as an example,studies the effects of photovoltaic power connected to grid,such as reactive power flow,power quality and network protection,and puts forward the corresponding measures to reduce the effects.Based on the design of photovoltaic power generation system in Zhanjiang power grid photovoltaic power generation system,this paper studies as follows:(1)under different operating conditions,assessing reactive power flow,analyzing when photovoltaic power connected into the system,if the system voltage is beyond the standard limit,if the photovoltaic power stations has a certain adjusting ability of outlets reactive power and power factor.(2)evaluation of power quality indicators,through the quantitative analysis of voltage deviation,voltage fluctuation and flicker,harmonic interference and damage,three-phase voltage unbalance,analyzing whether the index quality reach the national standard,whether there is a need to take measures to improve the quality of electric energy when the photovoltaic power station connected into the power system;(3)analysis the power grid protection influence of Jingke photovoltaic power and Yanjing wind power generation system connected to grid,puting forward the corresponding measures to reduce the influence.