Research On Frequency Regulation Of Power System Incorporating Large-scale Wind Farm

When fossil energy has been exhausting and polluting the environment,renewable energy become the only way of mankind living sustainably.As a mature technology of exploiting and utilizing renewable energy wind power generation is developing and it's capacity in the grid is increasing rapidly.But wind power generation also has the shortcomings of uncertainty and volatility,whose impaction on the frequency of grid is more serious as the capity increasing.In order to improve the frequency stability of grid with large-scale wind power integration,we analyse the influence of wind power on grid frequency deeply and propose an effective method of evaluting the maximun frequency deviation.first,a linear System Frequency Response(SFR)model of power system incorporating wind farm is built,based on which the amplitude of frequency caused by sinusoidal wind power fluctuations can be abtained.Then,an effective method of evaluating the maximun frequency deviation considering he boundary of generator capatity,which will infulence the frequency deviation greatly.after that,the affectiveness and accuracy of the evalution method is verified in DIgSILENT/Power Factory.In the simulation of power system incorporating wind farm,we find the failure phenomenon of traditional governor regulating freuquency under high-frequency wind power fluctuation,because the governor and turbine are physical actuators,which have the lagging response.The failure phenomenon of frequency regulation existes do exist in the simulation of DIgSILENT software,and will seriously impact the stability of power system with high wind power penetration.How to deterrent the wind power fluctuation will be one of research topics on the power system incorporating large-scale wind power in the future.