Abstract
The conventional PID pitch controller was usually used in direct-drive permanent magnet wind turbine in order to maintain the output power unchanged above the rated wind speed. However, due to the complex structure of wind turbine as well as high nonlinearity of wind speed, the effect of PID control method is often less than ideal. A new pitch control method combined with fuzzy adaptive PID and fuzzy feed forward controller is proposed in this paper. The fuzzy adaptive PID controller is able to ensure the unit having a better control result than PID controller at various wind speeds. The fuzzy feed forward controller has improved the responsiveness of pitch control system. With the simulation of a 1.5MW wind turbine, the responsiveness and stability of wind turbine can be effectively proved by the new pitch control method above the rated wind speed, the system’s overshoot is also reduced, which satisfies the demand of power control.
Highlights
At present, the pitch control method is usually adopted above the rated wind speed by large wind turbines
Design of Fuzzy Feed-Forward Controller The objective of pitch control system is to ensure that output power is constant at any time when the wind speed is changing
Due to the complexity structure of wind turbine and the strongly nonlinear of the wind speed in wind farm, single PID pitch controller can not achieve satisfactory results when the speed is above the rated wind speed
Summary
The pitch control method is usually adopted above the rated wind speed by large wind turbines. Many researchers try to design pitch controllers by using intelligent methods, such as reference [1], variable universe adaptive fuzzy control strategy is used to control the pitch angle above the rated power, which effectively reduces the fluctuation effect of high frequency component of wind speed data on power regulation. It shows that the system has good dynamic performance. The simulation results show that the new method can effectively ensure the rapid response and stability of wind turbine, reduce the overshoot of system, and the effect of the control is better
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