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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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