Research On Wind Power Credible Capacity Considering Wind Power Output Correlation

Due to the volatility and intermittency of wind power output,the output level of the wind power does not match the installed capacity.Accurately establishing the trusted capacity of wind power can analyze the wind turbine and the conventional unit at the same level.This is for power system planning and grid security Stable operation is of great significance.At present,multiple wind farms operating in the same wind zone have certain correlation characteristics in space and wind speed.Therefore,in the analysis of wind power grid connection,the correlation between wind farms has gradually become a factor that cannot be ignored.Especially in the planning and operation of the power grid,the correlation between wind power output is particularly obvious.Ignoring this factor may erroneously judge the impact of wind power grid connection and increase the risk of safe and stable operation of the power grid.Therefore,it is necessary to establish wind power output Correlation model to accurately assess the impact of correlation on wind power grid connection.Regarding the problem of wind power correlation modeling,this paper establishes a correlation model of two wind farms based on the Copula function with a wide range of applications,no requirements on the distribution characteristics of wind power data,and a good fitting effect on the tail correlation characteristics.The scene is divided into four seasons:spring,summer,autumn and winter,and research is conducted,and the correlation characteristics between wind speed and output are analyzed in depth.Taking the output of two wind farms located in the same geographical area and in the same wind zone as the simulation case,the results show that the wind power output correlation model established by the method adopted in this paper is effective.One of the important evaluation indicators to measure the impact of wind power grid connection on system reliability is the credible wind power capacity.This paper establishes a wind power credible capacity evaluation model so that wind power can also be analyzed and studied from the perspective of conventional units,and on the original basis,Taking into account the relevant factors of wind power output,so as to be able to analyze and study wind power grid connection problems closer to the actual situation.Using IEEE RTS79 transmission reliability test system and MATLAB simulation software as the platform,the wind power credible capacity considering the correlation of wind power output is evaluated,and the different effects of correlation on the wind power credible capacity under different seasonal scenarios are analyzed.In the context of the current large-scale wind power grid connection,it is necessary to consider the correlation of wind power output for the trusted capacity of wind power.