Variable Pitch Sliding Mode Control of Wind Turbine Based on Disturbance Observer

Due to the randomness of the wind speed, the time variability of the wind turbine's parameters, the nonlinearity of the system and the time delay, the output power of the wind turbine is unstable. In order to improve the dynamic performance of the system in the constant power output operation area, based on the analysis of the research status of variable pitch control of wind power generation system, a sliding mode control scheme based on disturbance observer is proposed. This method not only has the robustness for sliding mode control parameters also has many advantages such as fast response. Adding the disturbance observer is effective to restrain the external disturbance of the system, ensuring the stability of the output power and the motor speed of the wind generator system under the condition of random wind speed disturbance. The results show that the variable pitch sliding mode controller based on disturbance observer has good dynamic performance and robustness to wind speed disturbance, which can effectively improve the pitch control effect of the system.