Abstract
As one of the most important performance index of a current source converter (CSC), DC-link current ripple is closely related to the modulation strategy. Excessive DC-link current ripple not only reduces the system efficiency, but also increases the total harmonic distortion (THD) of grid current and leads to more electromagnetic interference. To get around this problem, optimizing modulation strategy is more attractive compared with increasing the inductor or switching frequency. To this end, based on detailed analysis of the mechanism to reduce the DC-link current ripple and the inherent deficiency of current ripple continuous increase phenomenon between two adjacent sequences, a novel modulation strategy by employing optimized switching sequence according to the modulation index is proposed. By applying the proposed modulation strategy, the current ripple is effectively reduced in the full range of modulation index. Furthermore, the proposed scheme is easy to implement in practice without increasing the switching frequency or inductor. Finally, selected experimental results confirm the validity of theoretical analysis.
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