The present paper is concerned with introducing an effective direct power control (DPC) approach for a sensor-less doubly fed induction generator (DFIG). The derivation of the proposed DPC approach is performed in a systematic manner in which the design of the rotor current controllers is well analyzed, which clarifies the real base of the control system as when and why it works properly. The operation of the proposed DPC approach is based on the stator voltage-oriented control principle in which the stator voltage is aligned with the quadrature axis of the rotating reference frame. To obtain maximum generation efficiency, the reactive power reference value is derived based on a loss minimization criterion (LMC) that is described and analyzed in detail. To enhance the robustness of the control system, an effective rotor position estimator is proposed that is robust against the system uncertainties, such as the parameters’ variation. To validate the effectiveness of the proposed sensor-less DPC approach, the DFIG dynamic performance is tested for a wide range of operating speeds. The obtained results confirm and emphasize the feasibility of the proposed control approach and its LMC methodology in improving the generation efficiency and in obtaining high dynamic performance from the DFIG.

中文翻译：

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具有损耗最小化准则的无传感器双馈感应发电机的有效直接功率控制

本文涉及为无传感器双馈感应发电机（DFIG）引入有效的直接功率控制（DPC）方法。提出的DPC方法的推导是以系统的方式进行的，其中转子电流控制器的设计得到了很好的分析，从而阐明了控制系统何时以及为何能够正常工作的真正基础。提出的DPC方法的操作基于定子电压导向的控制原理，其中定子电压与旋转参考系的正交轴对齐。为了获得最大的发电效率，基于详细描述和分析的损耗最小化标准（LMC）得出无功功率参考值。为了增强控制系统的稳定性，提出了一种有效的转子位置估计器，该估计器对于系统不确定性（例如参数的变化）具有鲁棒性。为了验证所提出的无传感器DPC方法的有效性，对DFIG动态性能进行了广泛的运行速度测试。获得的结果证实并强调了所提出的控制方法及其LMC方法在提高发电效率和从DFIG获得高动态性能方面的可行性。