Department of Electrical Machines, Drives and Measurements, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Sensors (Basel). 2019 Nov 15;19(22):4979. doi: 10.3390/s19224979.
Designing electrical drives resistant to the failures of chosen sensors has recently become increasingly popular due to the possibility of their use in fault-tolerant control (FTC) systems including drives for electric vehicles. In this article, a virtual current sensor (VCS) based on an algorithmic method for the reconstruction of the induction motor (IM) phase currents after current sensor faults was proposed. This stator current estimator is based only on the measurements of the DC-bus voltage in the intermediate circuit of the voltage-source inverter (VSI) and a rotor speed. This proposal is dedicated to fault-tolerant vector controlled IM drives, where it is necessary to switch to scalar control as a result of damage to the current sensors. The proposed VCS allows further uninterrupted operation of the direct rotor-field oriented control (DRFOC) of the induction motor drive. The stator current estimator has been presented in the form of equations, enabling its practical implementation in a microprocessor system. Simulation studies of the proposed algorithm in an open and closed-loop DRFOC structure are presented under different operation conditions of the drive system. The experimental verification of the proposed method is also presented and the accuracy of the stator current estimation algorithm is analyzed under various operating conditions of the drive system.
由于在容错控制（FTC）系统中使用的可能性，包括电动汽车驱动器，设计对所选传感器故障具有抵抗力的电气驱动器最近变得越来越流行。在本文中，提出了一种基于算法方法的虚拟电流传感器（VCS），用于在电流传感器发生故障后重建感应电动机（IM）相电流。该定子电流估计器仅基于电压源逆变器（VSI）中间电路中的直流母线电压和转子速度的测量值。该建议专用于容错矢量控制 IM 驱动器，在这种驱动器中，由于电流传感器损坏，有必要切换到标量控制。所提出的 VCS 允许进一步不间断地运行感应电机驱动器的直接转子磁场定向控制（DRFOC）。定子电流估计器已以方程的形式呈现，使其能够在微处理器系统中实际实现。在开环和闭环 DRFOC 结构下提出了对所提出算法的仿真研究，研究了在不同的驱动系统运行条件下的工作情况。还提出了对所提出方法的实验验证，并分析了在驱动系统的各种运行条件下定子电流估计算法的准确性。
