دانلود رایگان مقاله انگلیسی مطالعه مقایسه ای درباره سه نوع کنترل کننده DFIG در سیستم مبدل انرژی باد - اشپرینگر 2018

Abstract

This paper presents an enhanced control strategy for Wind Energy Conversion System (WECS) using Doubly-Fed Induction Generator (DFIG). A robust Super-Twisting (STW) sliding mode control for variable speed wind turbine is developed to produce the optimal aerodynamic torque and improve the dynamic performance of the WECS. The electromagnetic torque of the DFIG is directly tracked using the proposed control to achieve maximum power extraction. The performance and the effectiveness of the STW control strategy are compared to conventional Sliding Mode (SM) and Proportional-Integral (PI) controllers. The proposed STW algorithm shows interesting features in terms of chattering reduction, finite convergence time and robustness against parameters variations and system disturbances.

7 Conclusion

This paper describes a robust control based on sliding mode for aerodynamic torque estimation to maximize wind energy extraction for a variable speed wind turbine. Three different controllers for the DFIG are developed and compared, in term of current and electromagnetic torque reference tracking and robustness. When the wind speed is varied, the effect on rotor direct current (control the reactive power) and electromagnetic torque (control the active power) values are much important with PI than SMC while it is without effect with STW control.

Although deceptively simple, PI control strategy has serious drawbacks that make it unsuitable for many practical applications. The comparison done in this work shows the limits of this controller with sensitivity to parameter variations and transient response, under high wind speed variations which can have negative effects on the quality and the quantity of the generated power. The results presented show that a sliding mode control method can be an interesting solution for system based on DFIG configuration for wind power conversion. However, chattering effect remains a significant problem with this technique. The obtained results show that STW strategy effectiveness is more attractive in terms of power extraction maximization, energy quality and higher accuracy, compared to more traditional techniques PI and classic SMC.