Study On The Influence Of Distributed Generation On Distribution Network Voltage

Distributed generation is an effective use of clean energy.It has good ecological friendliness and broad prospects for development.Therefore,it is the development trend of power grid to combine traditional power grid with distributed generation.The good power quality is the foundation of the power grid operation.With the distribution network gradually connected to the distribution network,the distribution network has a very wide influence on the distribution network,especially the influence of the voltage.This paper mainly studies the impact of distributed generation and distribution network on voltage stability of distribution network.First,the Newton Raphson method is used to calculate the power flow of distribution network with distributed generation.The 21 node distribution network model is established,and the simulation experiment is carried out on the influence of the single PQ type node distributed power distribution network to the distribution network,and the distributed power distribution network with different capacity and different location is simulated respectively.On this basis,the simulation experiments of multiple PQ type nodes distributed power supply to the distribution network are carried out.It can be seen that when several distributed power sources are connected to different nodes of the distribution network,the closer to the node at the end of the outgoing line,the greater the voltage rise,and vice versa,and the greater the corresponding voltage change rate at this node.Then the 33 node distribution network model is set up,and the simulation of two kinds of distributed power distribution network is simulated,and the simulation of distributed power distribution network with different position,different capacity and different power factor is carried out respectively.In the end,the influence of these two types of distributed power supply on the voltage of distribution network is compared,and the effect of them on the voltage of distribution network is studied.The results show that the access of wind turbine and photovoltaic power supply has an enhanced effect on the voltage stability index of the distribution network,that is,the supporting voltage,but different from the wind turbine and the photovoltaic power.The source plays a significant role in promoting the voltage stability index.