Study On The Influence Of The Grid Connected Photovoltaic Generation On The Stability

With the contradiction between industrial development and energy continue to highlight,seek and use of new energy has become a worldwide problem.Solar energy which is clean,renewable,global features get popular in the world,photovoltaic power generation be born at the right moment,which after the interconnection added the existing power supply grid,but due to the photovoltaic power generation output are intermittent,randomness and volatility,increase the complexity of power grid.Although the grid photovoltaic power generation has been gradually carried out,but to efficient use of photovoltaic power generation,the impact on the stability of the power grid must bring grid connected has enough understanding,this research is related to the future of photovoltaic power generation.In this paper,the energy shortage situation as the background,analysis of the solar energy distribution,the development status at home and abroad of grid connected photovoltaic,expounds the significance,further introduces the composition of photovoltaic system,the output characteristics,and its influence to the grid,introduced the power system.Discusses several factors to the stability of power system.This paper is based on the substation,build a model of 110 kV bus,analyzed the load remained unchanged,grid connected PV,not grid connected PV,the condition about voltage,frequency,load flow of photovoltaic power generation.The output in different weather changes on grid PV power plant,by monitoring data shows,intermittent,randomness and volatility of the photovoltaic power generation output,is one of the important factors affecting the stability of the grid.Based on this,the paper introduced and analyzed during the 2015 European eclipse output impact on PV,introduced Europe by the prediction of the PV output achieved during the solar eclipse in power grid stability Qualitative strategies and methods.After collected enough data of actual operation,analyzed the voltage,frequency,load flow in actual model of grid connected PV: the volatility of PV itself output on the alternation of day and night when the grid,back grid will have an impact on the power grid frequency;the PV output will change the voltage distribution.And the solar power station in the end of power grid have a certain ability to up the voltage at the end of the power grid,can improve the terminal load and power quality;the randomness and load demand impact load flow at the end of the power grid,or even changed the situation times in a day.Therefore,this paper introduces the control strategy based on grid connected inverter and the power forecasting method of photovoltaic power station based on wavelet neural network.Through reasonable control strategy,made a reasonable dispatching plan,which is helpful to improve the stability of power grid operation.