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An Improved Hybrid Modulation Control Strategy for MMC with Auxiliary Sub-Modules
投稿时间:2021-01-13  修订日期:2021-02-28
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DOI:
Keywords:Modular multilevel converter  Hybrid modulation scheme  Balance control  Frequency reduction control
Fund Project:National Natural Science Foundation of China (51977070);Science and Technology Projects of China Southern Power Grid (ZBKJXM20180560)
                 
AuthorInstitutionEmail
YANG Guangyuan Maintenance & Test Center of China southern power grid EHV Power Transmission Company yang_guangyuan@163.com
ZHOU Shijia China Southern Power Grid Research Institude Co.,Ltd zhou_shijia@163.com
PENG Guangqiang Maintenance & Test Center of China southern power grid EHV Power Transmission Company peng_guangqiang@163.com
WU Jiyang Maintenance & Test Center of China southern power grid EHV Power Transmission Company wu_jiyang@163.com
XIN Qingming China Southern Power Grid Research Institude Co.,Ltd xin_qingming@163.com
XU Shukai xu_shukai@163.com
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Abstract:
      The traditional nearest level approximation modulation (NLM) has the advantages of simple control and low switching frequency. However, when the number of output levels is small, the harmonic distortion rate of output waveform of modular multilevel converter (MMC) using NLM modulation is large. A full bridge auxiliary sub-module is added to each arm of the traditional three-phase six leg MMC topology. The capacitance voltage of the auxiliary sub-module is half of that of the half bridge sub-module. For the MMC topology, an improved hybrid modulation strategy is proposed. The hybrid modulation strategy can realize the balance control of half bridge and auxiliary sub-module, reduce the harmonic distortion rate of MMC AC side output current, and reduce the switching frequency and system loss of full bridge sub-module. A detailed simulation model is built in Matlab/Simulink. The simulation results verify the effectiveness of MMC topology and improved hybrid modulation strategy.
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