Analysis Of Impact Of Distributed Generation On Voltage And Loss Of Hohhot Power Grid

With the rapid increase of the capacity of photovoltaic being integrated into power grid,the influence of the photovoltaic output on power system is increasingly significant.Due to the effect of weather or the other environmental factors,photovoltaic output has the characteristics of randomness and uncontrollability.As a result,the increase of the capacity of photovoltaic connected to the grid has adverse impact on the safe and stable operation of the system.This thesis studied the impact of the photovoltaic output on the Hohhot distribution network based on the requirement of the photovoltaic integration to the Huhhot distribution network.The main contributions of this thesis are as follows.Firstly,the principle,status quote and related key technologies of the PV generation system are introduced,and the types of photovoltaic power generation system are summarized.The present situation and existing problems of photovoltaic system operation parallel to distribution system are discussed,and the possible effect of the photovoltaic system operation on distribution system is introduced.Secondly,the basic principle and method of power flow calculation are introduced.Combined with the actual situation of Hohhot grid,this thesis introduces Hohhot power grid in the aspects of load balancing,network loss statistics,grid operation mode changing,and the weak section.The improved measures and suggestions of the regional power grid operation in the future are put forward.Thirdly,this thesis computes and analyzes the influence of distributed photovoltaic power on voltage level in Hohhot grid.It also analyzes the impact of distributed photovoltaic power on the voltage of Hohhot typical distribution feeders.And the voltage distribution is got under different level of photovoltaic generation penetration.Finally,aiming at the influence of the distributed photovoltaic generation on the network loss,this thesis analyzes the network loss situation and the existing problems of Hohhot in 2016 in detail,and puts forward the corresponding improvement measures.The influence of the photovoltaic power on system network loss are calculated,and the network loss is discussed under different level of photovoltaic generation penetration.