Abstract
The paper introduces a cost effective predictive flux control (PFC) approach for a sensorless doubly fed induction generator (DFIG). The base operation of the proposed PFC depends on controlling the rotor flux (α-β) components using a cost function which is derived through analyzing the relationship between the developed torque and the angular slip frequency. To improve the rotor flux estimation and prediction, an effective rotor flux observer is proposed. A robust rotor position estimator is proposed to guarantee a precise co-ordinate transformation. In order to save the cost, only one rotor current sensor is utilized to evaluate the rotor currents. The finite control set (FCS) principle is utilized to select the voltage vectors which enables the elimination of the pulse width modulation (PWM). To validate the feasibility of the proposed sensorless PFC approach, a comprehensive comparison is carried out between the proposed sensorless PFC and the predictive torque control (PTC) for the DFIG. The obtained results confirm and emphasize the superiority of the proposed PFC in achieving the control objectives with lower ripples content and less computational burdens. Moreover, the effectiveness of the rotor position and rotor flux estimators has been confirmed through the obtained results.
Highlights
Improving the dynamic performance of the doubly fed induction generator (DFIG) has been paid great attention [1]–[5]
As an attempt to investigate more about the optimal control configuration for the DFIG through which various control objectives can be achieved; avoiding the shortages in previous methods and adding new contributions to the literature; the current paper introduces an effective predictive flux control (PFC) procedure which can be used with the DFIG as an effective alternate to the predictive torque and power control approaches
In order to validate the effectiveness of the proposed PFC approach and the robustness of the proposed rotor flux and rotor position estimators against system uncertainties such as the variation of stator resistance Rs, extensive tests have been carried out for a wide speed range
Summary
Improving the dynamic performance of the doubly fed induction generator (DFIG) has been paid great attention [1]–[5]. The cost function is consisting of two terms of similar nature (only flux) and there is no need to use a weighting factor as in classic PTC or PPC All of this contributed in simplifying the control structure, saving the computation time and reducing the switching losses as well. The cost function of the proposed PFC is consisting of two terms with the same nature (rotor flux α-β components) which enables the elimination of the weighting factor used by the classic predictive techniques. A detailed comparison in terms of total harmonics distortion (THD), average absolute error (as an indication of the ripples content in the controlled variables), number of commutations, switching frequencies, switching power losses and computational time under various operating conditions of DFIG has been carried out for the proposed PFC and PTC approaches as well.
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