Current sensors are needed in conventional field-oriented control (FOC) in 3-phase induction motor (3-PIM) drives. Nevertheless, these sensors are exposed to different faults which reduce the reliability of drive systems. To solve this problem, a current sensor fault-tolerant control (FTC) for 3-PIM drives without speed measurement is proposed in this paper. In the proposed scheme, a sensorless FOC strategy based on open-loop speed estimator is utilized for normal condition. A third-difference operator performs the task of fault detection and isolation (FDI). After FDI, a sensorless FOC strategy based on extended Kalman filter (EKF) is used for the faulty condition. In this paper, the EKF is used for stator currents and speed estimation during post-fault operation. Such scheme is appropriate for sensorless 3-PIM drives to increase safety and reliability of the system, in the case of current sensor fault. The proposed FTC scheme is experimented for a 1HP 3-PIM drive system through a DSP/TMS320F28335. The experimental results show that the proposed FTC system can accurately and effectively control the 3-PIM during both healthy and faulty conditions.

中文翻译：

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针对电流传感器故障的感应电机驱动器无速度传感器容错控制

三相感应电机 (3-PIM) 驱动器中的传统磁场定向控制 (FOC) 需要电流传感器。然而，这些传感器会面临不同的故障，从而降低了驱动系统的可靠性。为了解决这个问题，本文提出了一种用于无速度测量的 3-PIM 驱动器的电流传感器容错控制 (FTC)。在所提出的方案中，基于开环速度估计器的无传感器 FOC 策略用于正常条件。三阶差分运算符执行故障检测和隔离 (FDI) 任务。在 FDI 之后，基于扩展卡尔曼滤波器 (EKF) 的无传感器 FOC 策略用于故障条件。在本文中，EKF 用于故障后运行期间的定子电流和速度估计。这种方案适用于无传感器 3-PIM 驱动器，以在电流传​​感器故障的情况下提高系统的安全性和可靠性。建议的 FTC 方案通过 DSP/TMS320F28335 对 1HP 3-PIM 驱动系统进行实验。实验结果表明，所提出的 FTC 系统在健康和故障条件下都能准确有效地控制 3-PIM。