Abstract This paper addresses the problem of designing an adaptive nonlinear observer for wind energy conversion systems (WECSs). The study targets specifically a synchronous aero-generator connected to the grid using AC/DC/AC converter. The main objective of the present work is to establish a different approach for estimating the rotor speed, position and the turbine torque. Furthermore, the proposed technique aims to provide measures of the grid voltage, considered generally as accessible. Indeed, the considered voltage values in general are supposed to be the same as given by the transformer. However, transformers are generally positioned at long distances from measuring points. Unlike previous studies, the grid frequency is considered as an unknown parameter and time varying. Thus, electrical currents are the only needed measures. This proposed strategy, considered as sensorless, is validated by a formal analysis proving that all objectives are achieved. Finally, several simulations have conclusively proven that the proposed observer enjoys additional high robustness qualities.

中文翻译：

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带 PMSG 的无传感器风能转换系统的自适应非线性观测器

摘要 本文解决了为风能转换系统 (WECS) 设计自适应非线性观测器的问题。该研究专门针对使用 AC/DC/AC 转换器连接到电网的同步航空发电机。目前工作的主要目标是建立一种不同的方法来估计转子速度、位置和涡轮扭矩。此外，所提出的技术旨在提供电网电压的测量，通常被认为是可访问的。实际上，所考虑的电压值通常应该与变压器给出的相同。然而，变压器通常放置在距离测量点很远的地方。与以前的研究不同，电网频率被认为是一个未知的参数和时间变化。因此，电流是唯一需要的措施。这种被认为是无传感器的拟议策略通过正式分析得到验证，证明所有目标都已实现。最后，一些模拟最终证明了所提出的观察器具有额外的高鲁棒性品质。