To detect the fault of the doubly-fed induction generator (DFIG), in this paper, a fault detection method of novel sliding mode observer is proposed, without a velocity sensor. In addition to better elimination of chattering for the new sliding mode observer, at the same time, it has better stability and faster convergence speed than the traditional sliding mode observer. Firstly, the sliding mode observer is built according to the mathematical model of the DFIG. Then, the rotor current and the rotational speed are estimated. After comparing the actual rotor current value with the observed value, the self-detection of the fault for the DFIG is realized. Secondly, three faults of grid voltage sags failure, DFIG inter-turn stator fault and rotor current sensor fault are given respectively. After that the Simulink simulation model is built under different fault conditions. It is proved by simulation that this sliding mode observer can well detect faults occurring at different positions. Additionally, it can also be proved that the sliding mode observer has the characteristics of fast response and good stability.

中文翻译：

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基于转子电流的双馈感应发电机故障检测新滑模观测器

为了检测双馈感应发电机（DFIG）的故障，本文提出了一种新型滑模观测器的故障检测方法，无需速度传感器。新的滑模观测器除了更好地消除抖动外，同时比传统的滑模观测器具有更好的稳定性和更快的收敛速度。首先根据双馈电机的数学模型建立滑模观测器。然后，估计转子电流和转速。将转子实际电流值与观测值进行比较后，实现了双馈电机故障的自检测。其次，分别给出了电网电压暂降故障、双馈电机匝间定子故障和转子电流传感器故障三种故障。然后在不同的故障条件下建立Simulink仿真模型。仿真证明，该滑模观测器可以很好地检测不同位置发生的故障。另外，也可以证明滑模观测器具有响应快、稳定性好的特点。