Nonlinear Dual-Mode Control of Variable-Speed Wind Turbines With Doubly Fed Induction Generators

作者：Tang Choon Yik^*; Guo Yi; Jiang John N

来源：IEEE Transactions on Control Systems Technology, 2011, 19(4): 744-756.

DOI：10.1109/TCST.2010.2053931

• Active power
• maximum power tracking
• nonlinear control
• power regulation
• reactive power
• wind energy
• wind turbine

This paper presents a feedback/feedforward nonlinear controller for variable-speed wind turbines with doubly fed induction generators. By appropriately adjusting the rotor voltages and the blade pitch angle, the controller simultaneously enables: 1) control of the active power in both the maximum power tracking and power regulation modes; 2) seamless switching between the two modes; and 3) control of the reactive power so that a desirable power factor is maintained. Unlike many existing designs, the controller is developed based on original, nonlinear, electromechanically-coupled models of wind turbines, without attempting approximate linearization. Its development consists of three steps: 1) employ feedback linearization to exactly cancel some of the nonlinearities and perform arbitrary pole placement; 2) design a speed controller that makes the rotor angular velocity track a desired reference whenever possible; and 3) introduce a Lyapunov-like function and present a gradient-based approach for minimizing this function. The effectiveness of the controller is demonstrated through simulation of a wind turbine operating under several scenarios.

• 出版日期2011-7