Abstract
The current control of asymmetric PM synchronous machine is investigated systematically in this paper. The conventional proportional-integral (PI) control in dq-frame and three typical balanced current control methods are investigated and their relationship is revealed. These three methods include the proportional and resonant (PR) control in stationary αβ-frame, the dual current control, and the proportional-integral plus resonant (PI-R) control in dq-frame. Those three methods are functionally identical in suppressing the negative-sequence currents and well known in previous literature, but the relationship and difference between them have not been investigated systematically. It is found that there are resonant controllers at the center frequency of twice fundamental frequency in their equivalent control in dq-frame. Therefore, they can suppress second harmonic currents in dq-frame so that the negative-sequence currents can be suppressed. It is also found that the PR control in αβ-frame is equivalent to the dual current control in theory. Elaborate experiments are conducted in an asymmetric PMSM system to validate their capabilities.
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