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A two-level hierarchical structure is proposed to improve the stability of multi-machine power systems. The scheme consists of a local controller for each generator at the secondary level associated by a wide-area controller at the first level. The wide-area controller is in charge of evaluating the global signals, such as the center of rotor angle, the center of rotor speed. And the local controller...
In this paper, a doubly fed induction generator (DFIG) wind turbine controller which consists of two control loops is introduced. In steady state, the main control loop ensures that the wind power generators without wind speed measurement can perform active power control tasks below the nominal wind speed while the auxiliary stability control loop restraining the wind power system oscillations by...
To improve the stability of the power system integrated of wind farm, the wind power system energy function is proposed in this paper based on the energy conservation law. Then a stability control strategy based on the energy function is introduced. The impacts of DFIG operation limits on the control effect are also discussed. By variable speed operation, the control strategy restrains the wind power...
A Doubly-Fed Induction (DFIG) wind generator dynamic model is developed in PSCAD. Then a novel active power control strategy based on the indirect speed control is introduced to implement the power control tasks and the limits of these controls are also discussed. The novel strategy ensures that wind power generators without wind speed measurement can achieve the balance control and maximum power...
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