徐征的环流和减小开关频率.pdf

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徐征的环流和减小开关频率

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 26, NO. 3, JULY 2011 2009 Reduced Switching-Frequency Modulation and Circulating Current Suppression for Modular Multilevel Converters Qingrui Tu, Student Member, IEEE, Zheng Xu, Member, IEEE, and Lie Xu, Senior Member, IEEE Abstract— This paper describes a modified phase-shifted carrier-based pulsewidth-modulation (PSC-PWM) scheme for modular multilevel converters (MMC). In order to reduce the av- erage device switching frequency, a reduced switching-frequency (RSF) voltage balancing algorithm is developed. This paper also proposes a circulating current suppressing controller (CCSC) to minimize the inner circulating current in an MMC. Based on the double line-frequency, negative-sequence rotational frame, the three-phase alternative circulating currents are decomposed into two dc components and are minimized by a pair of propor- tional integral controllers. Simulation results based on a detailed PSCAD/EMTDC model prove the effectiveness of the modified PSC-PWM method and the RSF voltage-balancing algorithm. The proposed CCSC not only eliminates the inner circulating current but also improves the quality of the converter ac output voltage. A simple loss evaluation demonstrates that the RSF voltage-balancing algorithm and the CCSC reduce the converter power losses. Fig. 1. Basic structure of MMC. Index Terms—Circulating current, modular multilevel converter (MMC), negative sequence, phase-shifted carrier, pulsewidth mod- ulation. tions, because it is convenient to provide the two common dc

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