Research On Effect And Countermeasure Of Grid Connected Photovoltaic Distributed Power Generation On Power Grid Voltage

In order to solve the problem of lack of fossil fuels,In the domestic solar energy reserves of no pollution,high feature makes photovoltaic was widely used in the power grid,the new energy power generation has the verygood environmental protection science.With the increasing permeability of distributed photovoltaic power in distribution network,the influence of distributed photovoltaic on power quality of distribution network is increasing.This paper is based on the current situation of power grid and distributed photovoltaic actual access.Fully considering the future photovoltaic power access scale and access mode,Combined my experience at work.Most importantly,the mechanism of voltage deviation caused by power quality problem of distributed grid connected photovoltaic power generation,the calculation method of voltage deviation and the measures to improve the voltage deviation under the condition of photovoltaic access are deeply studied.Firstly,this paper analyzes the structure of the photovoltaic power grid system and constructs the mathematical model of the photovoltaic power grid system.Secondly,this paper studies the mechanism of voltage deviation in the distribution network under the condition of single photovoltaic parallel network and multiple photovoltaic grid connection,takes a theoretical derivation and analyzes the influence of line parameters,user load,photovoltaic output and access location on the voltage deviation of the dot.This paper analyses the specific situation of different load power,single photovoltaic grid and multiple photovoltaic grid.In the end,the paper gives a strategy of active and reactive power coordination control between reactive voltage regulation and photovoltaic grid connected system using the residual capacity of inverters,carries out the optimal control of the node voltage and establishes a reactive power optimization algorithm with photovoltaic power supply.At the same time,a simulation example is given in this passage.