Research On The Interactive Influence Of Renewable Energy Sources On Power Grid

The integration of renewable energy into the power grid is an ideal way to achieve energy conservation and emission reduction,and also an important part of the country's energy structure optimization.In view of the impact brought by the grid connection of renewable energy,this paper takes the grid connection of photovoltaic power generation and wind power generation as examples to systematically analyze and study the harmonic impact,Harmonic suppression and voltage stability brought by the grid connection.Firstly,this paper introduces two main power generation systems of renewable energy grid connection: photovoltaic power generation system and wind power generation system.The structure and principle of these two systems are described in detail,and MATLAB/SIMULINK is used to simulate and analyze these two power generation systems.To observe the influence of the two on the power quality of the grid,and to study the main causes of the problem: harmonic factor and voltage fluctuation factor.It lays a foundation for the analysis of power quality.Secondly,taking grid-connected photovoltaic power generation system as an example,the causes of generating harmonics are introduced,and the influence of harmonics on grid-connected photovoltaic power quality is shown.Moreover,the harmonic is detected in grid connection,and the harmonic content is accurately detected by the method of reactive power detection.Combined with FFT toolbox,the harmonic composition of photovoltaic grid connection can be observed more clearly.Active filter was used to suppress the harmonic of photovoltaic power generation system,and MATLAB/SIMULINK was used to compare the suppression effect.Finally,when the renewable energy is connected to the grid,the voltage stability problem comes with it.Taking wind power generation system as an object,the causes of voltage fluctuation and flicker after grid connection are analyzed,and the mathematical model of voltage fluctuation is established.Using the detection method recommended by IEC,MATLAB/SIMULINK is used to simulate the voltage fluctuation and flicker of wind power generation system,and analyze the influence ofits connection on the distribution network.