| Wind power is a green energy. It's also the most mature technology of renewable energy power. With the development of wind turbine technology, there are increasing number of large-scale wind farms which begin to access to grid. The impact of wind power to the grid became more and more significant. Because of this reason, people began to pay more attention to the wind power integration with the static security constraints.With the development of wind industry, the proportion of wind generation capacity in power system is increasing highly.Currently, large-capacity wind power generation equipment manufacturing technology has matured. The development of large wind farm has became a trend. The impact of wind power expanded gradually from the local network to the whole grid. At present, wind power integration emerges a lot of different characteristics. As follows: The capacity of a single wind farm increased. Wind farm access to the grid in a higher voltage level.With increasing capacity and higher voltage level of wind power integration, the impact of wind power had been broadened. When the capacity of wind power is large in power system, it will change the trend of the original distribution of transmission power.The paper briefs the bifurcation concept and N-1 principle ,appraises application of the theories. Though voltage stability, evaluate the capacity of wind power integrated to the power grid under the security constraints. Analysed the reduction of voltage stability after wind power integrated into the grid, while analysed the character of DFIG. Using sensitivity , selected the observation node in the grid. Based on doubly fed induction wind turbines, the reasons of voltage fluctuation were studied. Though dynamic simulation of the wind speed fluctuation lead to voltage instability, while analysed the increase in wind power lead to voltage instability by PV curve. This is helpful to determine the capacity of wind power in the grid. |
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