Abstract:In order to address the challenge that traditional damping strategies struggle to coordinate power generation quality with tower vibration reduction and load mitigation for wind turbines, a pitch coordination controller was investigated using a method combining gain scheduling and linear active disturbance rejection control (LADRC). First, a traditional damping pitch model was established for the NREL 5MW turbine, and its linearized model was obtained through the Taylor formula and the small perturbation method. Next, the pitch-speed model was identified as a first order plus time delay (FOPTD) system. First-order LADRC controllers were designed for the speed loop and the damping loop respectively, and their control gains were optimized in coordination with a genetic algorithm (GA). Finally, a gain scheduling rule for fitting the pitch reference was established using the Gompertz function, and nonlinear simulations were conducted in GH Bladed for verification. The results show that the proposed control strategy achieves tower vibration reduction and load mitigation without significantly affecting the static distribution range of the pitch angle, and optimizes the power generation characteristics of the turbine. It is concluded that the strategy has good effectiveness and adaptability.