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Dual SVPWM strategy for digital implementation of any n–level MMC structure

Space vector modulation (SVM) is well established for conventional multilevel topologies and it can be very useful for MMC owing to its superior harmonic performance. This paper proposes a dual SVM strategy which is a generalized approach and has same number of steps for any level converter. This technique is based on mapping of the actual reference vector to a two level mapped reference vector and finding of dwell times of corresponding equivalent two level switching vectors. Once these are obtained, equivalent switching vectors are transformed to the actual switching vectors in the multilevel space vector structure using simple predetermined transformation relations. Here, two SVMs are used to modulate the upper and lower arms. The problem of circulating current is also included in the analysis and a circulating current controller is used for compensating the dc and second harmonic arm currents. This circulating current controller uses both PI and resonant controller to control the dc and second harmonic currents. This work focuses on the simple generalized digital implementation of SVM for MMC and hence ideal submodules (SMs) are chosen with fixed DC voltages.