Dynamic Interleaving Strategy to Reduce DC-Link Ripple of Dual Three-Phase Permanent Magnet Synchronous Machine Drives by Using Discontinuous Space Vector Modulation

A dynamic interleaving method is proposed in this paper to reduce the DC-link ripple for dual three-phase permanent synchronous machine drive systems. Existing literature covers the constant interleaving approach, where the interleaving angle is fixed, which is incapable of reducing the DC-link ripple significantly. During the overlapping condition of the DC-link currents of the two three-phase subsystems, the proposed method uses an interleaving angle of π while the rest of the time it is 0. As the proposed method is dynamically varying the interleaving angle, it is called the dynamic interleaving approach. All the dominant harmonics in the DC-link ripple are reduced through the proposed strategy, whereas the constant interleaving cannot reduce all the harmonics. The performance of the proposed strategy is compared to constant interleaving and non-interleaving approaches. Through the proposed method, the DC-link ripple is significantly reduced compared to other approaches, and thus, it improves the power density of the system. Simulation and experimental results are provided to validate the performance of the proposed strategy.