Research On Voltage Optimization Control Of Distributed Photovoltaic Distribution Network

The voltage control strategy of distributed photovoltaics after accessing the system is described in this paper.The first part briefly describes the composition of distributed photovoltaics and analyzes the mechanism and phenomenon of distributed photovoltaics affecting the power grid.It is proposed that when distributed PV access,the impact of the system is mainly reflected in protection,voltage fluctuation and reactive power control.The article focuses on voltage research,expounds the mechanism of the influence of distributed photovoltaic access on system voltage,and qualitatively analyzes its voltage distribution.It is concluded that when distributed PV access,the power transmitted by the system will be relatively reduced.The corresponding voltage will also increase.By comparing with no access,it is found that the closer to the distributed photovoltaic access point,the more obvious the voltage rise.In terms of distributed photovoltaic capacity,the greater the capacity of the access,the more obvious the effect of the increase in system voltage.In view of this phenomenon,the current voltage control methods are compared in this paper,and combines the characteristics of the distributed photovoltaic access system to select the current most advanced reactive power compensation device SVG to control the voltage problem.The external penalty function optimization algorithm is used to optimize the SVG capacity to be connected to the grid.Solving the problem of low qualification rate of distribution network caused by the integration of distributed photovoltaic power generation,the power quality of the distribution network and the reliability of power supply are significantly improved.Taking the 9702 area of Jiangxia,Wuhan as an example is the last part of this article which proves the feasibility of the approach.