Fault Tolerant Control Method based on Fourier Transform Decoupling
In the fault-tolerant control of polyphase motors,hysteresis control is generally adopted for the more complex non-sinusoidal fault-tolerant current obtained by multi-constraint solving.Compared with hysteresis control,voltage space vector control has the advantages of low torque ripple and low energy consumption,which is more common in the control of polyphase motors.In order to solve the problem that the non-sinusoidal fault-tolerant current cannot be decoupled directly for voltage space vector control,Fourier transform is introduced and the non-sinusoidal fault-tolerant current is decomposed into fundamental current and third harmonic current to realize the decoupling transformation of the non-sinusoidal fault-tolerant current.Based on this,the decoupling transformation matrix is derived and the correctness of the processing method is verified by simulation analysis.The results show that this method can solve the problem that the non-sinusoidal fault-tolerant current under open fault-tolerant control of polyphase permanent magnet synchronous motor cannot be directly applied to voltage space vector control,so as to reduce the torque ripple and improve the motor current stability.
five-phase permanent magnet synchronous motorfault tolerant controlFourier transformdecouplingvoltage space vector control
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