The bifurcation analysis on dynamic voltage stability of different wind power systems

In order to obtain the impacts that the power injection of wind farm parameter and reactive power parameter respectively and comprehensively on dynamic voltage stability in wind power. For a typical power system, wind farm based on induction generator and wind farm based on doubly-fed generator are used, adding dynamic load model, two kinds of wind power dynamic models are analyzed by single-parameter bifurcation and two-parameter bifurcation. The process indicate that the method by two-parameter bifurcation is superior to that by single-parameter in revealing the influences of system-parameters on voltage stability of wind power system. The results show that system stability margin would be enormously reduced by overweight reactive load when power injection continuous increasing increasing in both of two wind power system under the same structure and parameters; when power injection is constant, the system stability would be not affected by the variation of reactive load; the system can be operated in the highest efficient if the situation that overweight reactive load with power injection continuous increasing can be avoid by adjusting power injection and reactive load; the stability of wind power system based on doubly-fed generator is much better than that of wind power system based on induction generator, and the wind power system based on doubly-fed generator can obtain much more accurate system stability margin.