Research On Impact Of The Photovoltaic System On The Voltage And Power Loss Of Hengshui Grid

The impact of the distributed photovoltaic system on the distribution network in becoming more and more serious with the increasing penetration of the photovoltaic.The prominent features of the photovoltaic system is the variant,fluctuation and uncontrollability for the influence of the solar radiant and termperature.Hence,the distribution network with high penetration photovoltaic system is unstable.This paper studied the impact of the distributed photovoltaic on the distribution network.The main contents of this paper is as follows:Firstly,the mathematical principle,status and key technology of the photovoltaic system are introduced in detail.The main problems of the photovoltaic system are summerized.The method and features of the load flow of distribution network are introduced.The process and the steps of the load flow of distribution network are mastered.The model of the load flow of the distribuiton network with photovoltaic system is built.And the mathematical equation of the impact of the photovoltaic system on the voltage profile and power loss of the distribuion network is deduced.Then,the simulation model of the photovoltaic system is built in the simulation software.The mathematical model of the array,converter and ect are introduced in detail.Thus the simulation model of the photovoltaic system is built in the DIgSILENT/PowerFactory is built.The simulation of the characteristics of the photovoltaic system under the flucturaion of the radiantion,reactive power and the voltage is performed.Thus,the rightness of the simulaiton model is verified.Finally,the impact of the distributed photovoltaic on the distribuion system is studied.The distribution network model is built in the DIgSILENT/PowerFactory based on teh topology and parameters of the actural distribuiton network.The impact of the distributed photovoltaic system on the distribuiton network is done under scenarios with different connection points and connection capacity of the distributed photovoltaic.The simulation results are analyzed in detail.