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A New Modular SPWM Strategy for Parallel Isolated Matrix Rectifiers to Improve Current Quality

To increase the power rating of isolated matrix rectifiers, a parallel structure is introduced in this paper. To improve the current quality on both the AC and DC sides, a new modulation strategy is proposed using the SPWM approach. First, the duty cycle compensation is enabled by revised current reference, which could reduce the low order harmonics on the AC side of each rectifier. Then, the interleaved operation is adopted to realize the high order harmonic cancellation on the AC and DC sides. To verify these merits, a 3-rectifier-parallel system is demonstrated as verifications. It shows that the proposed method can easily scale-up for a parallel structure without much increase of computation burden, and both the DC current ripple and the AC current harmonics can be effectively reduced.