Dynamic Interleaving Method to Reduce DC-link Ripple for Asymmetric Dual Three-Phase Permanent Magnet Synchronous Machine Drives

A dynamic interleaving method is proposed in this paper for the asymmetric dual three-phase permanent magnet synchronous machine drive system to reduce the dc-link current ripple. The proposed method dynamically varies the phase shift angle (interleaving angle) between the pulse width modulation (PWM) carriers of the two three-phase subsystems. The proposed method reduces the dc-link current ripple significantly compared to the no interleaving and constant interleaving methods. Reduction in the dc-link current ripple reduces the dc-link capacitor requirement and substantially increases the inverters' volumetric power density. Simulation and experimental results are provided to validate the performance of the proposed method.