The Impact Of Large Scale Wind Power Integration To Power System Small Disturbance Stability

As an important part of the future energy market,wind power capacity is increasing year by year.After large scale wind power connected to power system,the dynamic behavior and the stability mechanism of the whole system can be changed significantly.Small disturbance stability analysis of large scale wind power connected system is an important research.In this paper,based on the review of small disturbance stability analysis of wind power connected system,the mathematical model of wind turbine and the analysis method of small disturbance stability are researched clear based on PSAT.Built a simple system by PSAT,the impact mechanism of small disturbance stability system of large-scale wind power grid and its influencing factors are analyzed,including the type of wind turbine,wind power access location,the penetration of wind power and DFIG power factor and load rate of DFIG by eigenvalue analysis and time domain simulation method.Based on the above analysis,a method to improve the small di sturbance stability of wind power grid connected system is proposed.Use synchronous machine instead of the system of all wind turbines,and calculate the synchronous machine participation factors on synchronous machine of the original system so as to find out the key wind farm location,and then change the key position of the wind farm wind power factor and wind load rate,can improve the small signal stability of systems.Finally,the validity of this conclusion is verified by building a regional system i n Northwest power grid.The research of this paper provides a theoretical basis for the power supply planning of large-scale wind power connected system,and it has important significance to ensure the stable operation of large-scale wind power connected system.