Abstract
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.
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Appendices
Appendix A
Parameters and nominal values of the 3-PIM
Stator resistance | Rotor resistance | Stator and rotor self-inductances | Mutual inductance | Number of pole pairs | Moment of inertia | Viscous friction coefficient | Nominal torque | Nominal voltage | Nominal power |
---|---|---|---|---|---|---|---|---|---|
10.44Ω | 14.64Ω | 0.6067H | 0.597H | 2 | 0.016 kg.m2 | 0.001 N.m.s | 5.1 N.m | 400 V | 1HP |
Controller parameters
Speed PI controller | Current PI controller (d-axis) | Current PI controller (q-axis) | Reference rotor flux | Threshold |
---|---|---|---|---|
\( \begin{aligned} K_{p} = 80\frac{A}{{\left( {{\text{rad}}/s} \right)}} \hfill \\ K_{i} = 120\frac{A}{{\left( {{\text{rad}}/s} \right)}} \hfill \\ \end{aligned} \) | \( \begin{aligned} K_{p} = 2\frac{V}{A} \hfill \\ K_{i} = 11\frac{V}{A} \hfill \\ \end{aligned} \) | \( \begin{aligned} K_{p} = 2\frac{V}{A} \hfill \\ K_{i} = 11\frac{V}{A} \hfill \\ \end{aligned} \) | 1wb | 0.7A |
Appendix B
The dq mutual fluxes can be expressed by (54) and (55) [28]:
Based on (30)–(33), (54), and (55), the following equations can be written:
The stator dq currents in terms of dq fluxes can be written as [28]:
Based on the 3-PIM model, (58), and (59), the rotor dq fluxes can be expressed by (60) and (61):
Finally, based on (56), (57), (60), (61), the following equations can be written:
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Gholipour, A., Ghanbari, M., Alibeiki, E. et al. Speed sensorless fault-tolerant control of induction motor drives against current sensor fault. Electr Eng 103, 1493–1513 (2021). https://doi.org/10.1007/s00202-020-01179-0
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DOI: https://doi.org/10.1007/s00202-020-01179-0