Abstract
In this paper, the virtual space vector modulation for the AC–DC (alternating current–direct current) matrix converters is proposed to reduce the DC current ripples in the whole modulation index range. In the proposed method, each virtual vector is synthesized by the two nearest original active vectors. To synthesize the current reference vector, two virtual vectors and one zero vector are used in every switching period. The main principle of the proposed method is to reduce the dwelling period of the largest active current vector in each sector. In addition, the optimized switching patterns are proposed to further reduce the DC current ripples at both high- and low-power operation. Finally, simulation and experimental results are illustrated to validate the effectiveness of the proposed strategy.
Highlights
In recent years, the AC–DC matrix converters (MC) have received significant attention in various fields
The switching period of zero vector is the longest period at low-modulation operation, the optimized switching patterns for zero vector are proposed in this paper to further reduce the DC current ripple of AC–DC MC
It can be seen that the proposed virtual space vector modulation (VSVM) control strategy effectively reduces the DC current ripple of AC–DC MC compared with C-space vector modulation (SVM) and conventional VSVM (C-VSVM) strategies in the range of high-modulation operation
Summary
The AC–DC (alternating current–direct current) matrix converters (MC) have received significant attention in various fields. The direct power factor control strategy for the three-phase AC–DC MCs was illustrated in [16] based on applying the reduced general direct SVM approach of the AC–AC MC theory. Literature [19] studied the optimal zero-vector configuration to reduce the output inductor current ripple for the space-vector-modulated AC–DC MCs. The optimized modulation strategy to deduce the charging current ripple for vehicle to grid (V2G) applications using the AC–DC MC was presented. The approach [20] proposed a sectional optimized modulation strategy, which can reduce DC ripples within the whole operation range by dividing many different sectors, and different groups of vectors are selected to synthesize the current vector.
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