Compound Control Strategy of Composite Wind Turbine Pitch Control Based on Differential Evolution-Fuzzy PID

Abstract

In view of the characteristics of non-linearity， time delay and multiple disturbances of wind turbine pitch system， this paper proposes a wind turbine pitch compound control strategy. In the strategy， wind speed is introduced into the control system as a feedforward signal to dynamically compensate the pitch angle and improve the system response speed. In order to improve the robustness and the system's ability to suppress disturbances， a fuzzy PID （proportion-integral-derivative） controller is used. The differential evolution algorithm is adopted to optimize the initial parameters of PID， and the PID controller parameters are dynamically modified through fuzzy rules. The proposed strategy is applied to a 2 MW direct-drive wind turbine and compared with differential evolution-fuzzy PID control and fuzzy PID control. The results show that the proposed strategy can make the output power of the wind turbine more stable， which verifies the effectiveness of the proposed control strategy.

Keywords

• feedforward control
• fuzzy pid
• pitch control
• differential evolution algorithm