Research On The Impacts Of Large Scale Wind Power Integration On The Stability Of Power Systems In Northwest Yunnan

As large scale wind farms integration on power grid, more and more impacts will bebrought on the security stability、dispatching and many other aspects of power system. Soit is urgent to carry out the relevant theoretical research and analysis. The transientstability、dynamic stability and voltage level of a power system what integration on manylarge scale wind farms had been researched in this paper. The research work has made thefollowing creative results:The part of transient stability analysis firstly established the mathematical model ofthe transient stability of a power system which integration on wind farms. And then solvethe power system differential equations and algebraic equations for processing by thetrapezoidal implicit integration method and admittance matrix triangular decompositionmethod, complete with the power system transient stability calculation and analysis.Northwest Yunnan power grid as an example, analyzed the access of large scale windfarm power angle stability problems.The part of dynamic stability analysis firstly established the mathematical model ofthe small signal stability of a power system which integration on wind farms,simultaneous the linearization of the fixed pitch asynchronous wind power generator, thedoubly-fed wind power generator equations and original equations of linear system,formed the augmented state matrix of power system integration on wind farm. Secondlyused the implicit restart Arnoldi eigenvalues algorithm and sparse matrix technology tosolve the augmented state matrix eigenvalues. Northwest Yunnan power grid as anexample, analyzed the influence of oscillation mode and oscillation characteristics of thepower grid when large scale wind power integration on. Finally analysis the dynamicstability after large disturbance, use Prony method to analysis angle curve of thehydropower unit which is nearby the failure, analysis the damping ratio and dampingcharacteristics.The part of voltage analysis the influence of doubly-fed wind power under differentcontrol mode, the characteristics of low voltage ride to the grid voltage of NorthwestYunnan under the large disturbance fault, the influence of the power grid voltage levelunder the wind speed disturbance.