In three-phase inverters, three-phase inductors and three-phase transformers generally use three-column cores for volume and cost considerations, but the resulting three-phase magnetic circuit coupling makes the dynamic model of the three-phase inverter more complicated. Based on the instantaneous value symmetrical component transformation, a simple and practical dynamic mathematical model of the three-column transformer and three-column inductor can be established, and the decoupling of the instantaneous symmetrical component can be achieved. Therefore, the stability judgment of the three-phase inverter can be transformed into the stability judgment of the instantaneous symmetrical component. Based on the instantaneous symmetrical component transformation, this paper studies the dynamic characteristics of the three-phase inverter using three-column inductors and three-column transformers, and obtains a stability judgment method for the three-phase inverter after considering the magnetic circuit coupling.
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