Conference Paper

Active Power Control Strategies of DFIG Wind Turbines

Catholic University of Louvain, Лувен-ла-Нев, Walloon, Belgium
DOI: 10.1109/PCT.2007.4538370 Conference: Power Tech, 2007 IEEE Lausanne
Source: IEEE Xplore

ABSTRACT This paper is devoted to the active power control of DFIG wind turbines. An adaptation of the usual power set point control has been proposed in order to improve the transient behavior for high wind speeds. Several strategies for the active power control are studied. In the high wind speed range, the pitch control seems the most relevant to release a power margin while, in the low wind speed range, the increase of the rotation speed is more convenient. The power margin set point variation rate has to be limited in order to avoid torsion oscillations of the shaft. Nevertheless, the reaction speed of the wind turbine lies in the time frame of seconds, so that the participation to the primary frequency control is feasible.

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    • "Although the results are interesting, there is a lack of discussion on reactive power control, which is sometimes crucial to power system reliability. On the other hand, for those references [22]–[36] considering only the electrical part, [22], [23] considered only the active power control, while [24]–[27] dealt with the reactive power. In contrast, we provide an integrated solution to the more difficult problem of simultaneously controlling both the active and reactive powers by appropriately adjusting both the rotor voltages and the blade pitch angle. "
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    ABSTRACT: 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.
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    ABSTRACT: This paper proposes a nonlinear control design technique for wind generation systems that deals with both active power and reactive power at the same time in consideration of the fact that the wind generation system is a high order nonlinear dynamical system. Unlike the existing controller designs, the proposed technique is developed based on original nonlinear models of electric machine and wind turbine, and does not use any linear assumption. In addition to the desired reactive power control, the proposed controller also regulates the active power output in either maximum power tracking mode or power regulation mode. The effectiveness of the controller is demonstrated through simulation.
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    ABSTRACT: In this paper, an operating strategy is suggested for the participation of variable speed, variable pitch wind generators (VSVPWG) in primary load-frequency regulation through pitch-control. The proposed strategy is mathematically precise and neither direct wind measurement as a control input, nor any linearization of the system are required. The above suggested are independent of the specific type of the electric generator connected to the turbine and the only requirement is the expansion of the look-up tables of the aerodynamic characteristics of the rotor. The operating strategy is applied to a VSVPWG model developed in MATLAB-Simulink and connected to both a doubly-fed induction generator (DFIG) and a full-power converter synchronous generator (FPCSG). Indicative simulation results are shown, the effectiveness of the proposed control versus wind and set-point of power variations is validated, tuning issues are addressed and lastly a comparison is presented between the aforementioned technique and the method of over-speeding previously developed and published in the specific field of research.
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