Suppression of Force Fluctuations in Segmented PMLSM Using Harmonic Injection During Phase Open of the Inverter
This paper proposes a method to suppression of force fluctuation caused by single-phase open circuit faults of the inverter for a long primary segmented dual three-phase permanent magnet linear synchronous machine(PMLSM).First,the voltage equation of the segmented dual three-phase PMLSM unit machine based on the mover position in the unit machine is derived,and the force expressions of each unit machine and the total force are obtained.after that,based on the principle that the fundamental magnetic linkage of the unit machine in the fully coupled state unchanged before and after single-phase open circuit of the inverter,a reduced-order coordinate transformation matrix is constructed to obtain the voltage and force expression of the machine.To eliminate the 4th and 6th harmonics of the force fluctuation for segmented dual three-phase PMLSM caused by the fault and the coupling coefficient change,a method of harmonics current injection is proposed.Multiple inverter-coordinated control of multiple unit machines is implemented to reduce the force fluctuation after the one-phase open fault,and the maximum total force of the linear machine is optimized without affecting the force fluctuation.The method's effectiveness is demonstrated through simulations and experiments.
permanent magnet linear synchronous machinesegmented poweredmulti-inverterssingle-phase open circuitforce fluctuation
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