Fault-tolerant control of a double star induction machine operating in active redundancy
DOI:
https://doi.org/10.20998/2074-272X.2025.6.04Keywords:
double star induction machine, active redundancy, field-oriented control, reliabilityAbstract
Introduction. The operating safety of a variable-speed drive is of paramount importance in industrial sectors, such as electric propulsion for ships, rail transport, electric cars, and aircraft, where reliability, maintainability, and safety are top priorities. Problem. One solution to improve the availability of a variable-speed drive is the use of a double star induction machine (DSIM). This machine can provide active or passive redundancy. Redundancy is active if both converters operate simultaneously, and the failure of one of them does not affect system operation. Passive redundancy is passive if only one converter is operating and the 2nd is on standby; the latter will only operate if the first fails. Goal. Improving the availability of a DSIM by the operation in active redundant of the machine supply system. Methodology. Use scalar control to control the machine power system in active redundancy. Simulation results with this scalar control demonstrated the need to equip this control with a decoupling of the variables responsible for machine magnetization and torque production. Field-oriented control (FOC) is then used to ensure the reconnection of a converter after a failure for active redundancy operation, without the risk of significant torque ripples. Scientific novelty. To increase the availability of the variable speed drive, an original control strategy for reintegrating the repaired faulty inverter is implemented to allow the repaired inverter to resume operation of the drive motor. This strategy control is based on the specific use of FOC to resynchronize the output frequency of the repaired inverter with the motor speed. Results. The results demonstrated the value of vector control in each star power supply system to avoid transient over currents at the input of the 2nd converter, by synchronizing the frequency of the 2 converters to the rotor speed. Practical value. An experimental model around a DSIM is set up to validate the active redundancy operation of the system. Active redundancy provides the variable speed drive with an increase in the reliability of the variable speed drive and significantly improves the availability rate of the driven load, since the disconnection of one of the 2 converters following a failure does not affect the operation of the machine. References 17, tables 2, figures 13.
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