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Comparison of two current modulation strategies for matrix converters under unbalanced input voltage conditions

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4 Author(s)
Blaabjerg, F. ; Inst. of Energy Technol., Aalborg Univ., Denmark ; Casadei, D. ; Klumpner, C. ; Matteini, M.

In this paper, the input current performance of matrix converters is analyzed, especially with reference to the operating conditions determined by unbalanced supply voltages. The space-vector modulation (SVM) technique is utilized to calculate the duty cycles of the active voltage vectors that must be applied, in each switching cycle period, in order to satisfy the input and output requirements. A detailed theoretical analysis of the input current harmonic content under unbalanced input voltage conditions is presented for two different current modulation strategies. On the basis of numerical simulations as well as measurements on a laboratory prototype setup, the strategies' performance are compared and the validity of the theoretical investigation confirmed. It is concluded that, when the input voltages are unbalanced to a significant extent, a dynamic input current modulation strategy has to be preferred, since a lower harmonic line current distortion will appear

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:49 ,  Issue: 2 )

Date of Publication:

Apr 2002

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