Fault-tolerant control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor with improved SVPWM
A permanent magnet synchronous motor, open-circuit fault technology, applied in the direction of motor control, motor generator control, electronic commutation motor control, etc., can solve the problem that the utilization rate of DC bus voltage and harmonic current suppression have not attracted enough attention and degree of freedom Small problems, to achieve high dynamic performance fault-tolerant operation, improve voltage utilization, reduce the effect of current harmonic content
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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0044] Step 1, deduce and simplify the phase voltage decoupling transformation matrix under the general fault-tolerant SVPWM control mode.
[0045] Assuming that the single-phase open-circuit fault occurs in the A-phase winding of the five-phase permanent magnet motor, the phase voltage decoupling transformation matrix under normal conditions can be expressed as equation (1):
[0046]
[0047] where T Clarke is the phase voltage decoupling transformation matrix under the open-circuit fault of phase A; α x is the angle between two adjacent phases.
[0048] The general fault-tolerant SVPWM control method is to simplify the decoupling calculation of the phase voltage, adjust the transformation matrix, and obtain the phase voltage decoupling transformation matrix as shown in ...
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