Comparison of the low frequency oscillation modes under the influence of different wind plants in large area

As the most environmentally friendly source of power generation, wind power turbines is expanding in the grid. It will also have a broad and deep impact on power system stability. In this paper, a comparison of characteristics is made among three mainly used wind turbines currently which are constant speed wind turbine (CSWT), doubly fed induction generator (DFIG), direct drive synchronous generator (DDSG). Then a MATLAB-based Power System Analysis Toolbox PSAT is used for investigating the dynamic behavior of three generators in a strongly coupled two regional systems. Finally, a complicated two regional test system was introduced to analyze the small signal stability of different wind turbines when wind penetration power is increasing.