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Post-Fault FOC Transformation Matrix for Unequal Amplitude Currents During Dual Open-Phase Fault

Many critical five-phase PMSM drive systems require operation after a dual open-phase fault has occurred. Previously documented techniques suggest that injecting unequal amplitude currents into the non-faulted phases can minimize the torque ripple generated by this type of fault. However, the only control method which can control these currents is a phase current hysteresis controller, which generates larger magnitude harmonic currents and provides less control of the transient response when compared to field-oriented control (FOC). Therefore, this paper proposes a novel method for developing a post-fault FOC transformation matrix which can produce constant transformed current references for a given set of three unequal amplitude phase currents. This transformation matrix is then implemented in an FOC architecture with two proportional-integral current controllers and a phase back-EMF feed-forward block. An example post-fault transformation is outlined in this paper for a set of unequal amplitude post-fault currents which are calculated using a previously documented post-fault optimization algorithm. This transformation is then implemented in an experimental setup to provide experimental validation that the proposed post-fault FOC technique can accurately control unequal amplitude phase currents with minimal distortion.