Control strategy of MMC power electronic transformer powered to passive network under grid voltage fault

被引：0
|
作者：
Cheng Q. [1 ]
Zhao M. [1 ]
Ma X. [1 ]
Jiang C. [1 ]
机构：
[1] Shanghai Key Laboratory of Power Plant Automation Technology, School of Automation Engineering, Shanghai University of Electric Power, Shanghai
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2022年 / 43卷 / 04期
关键词：
Control nonlinearitie; Electric fault; Euler-Lagrange(EL) mathematical model; Modular multilevel converter; Power converter; Power electronic transformer;
D O I：
10.19912/j.0254-0096.tynxb.2020-0846
中图分类号：
学科分类号：
摘要：
Power electronic transformers(PET) have the advantages of instantaneous power regulation and harmonic suppression. Power transmission line to passive networks through PET is an important application field of flexible power transmission. At the same time, the combination of modular multilevel converter(MMC) technology and PET makes it possible to apply PET to high-voltage, large-capacity power transmission and power distribution systems. First of all, under the positive and negative sequences system when the grid fails, this paper derives the passive controller(PBC) of the inner loop positive and negative sequence current based on the Euler-Lagrange(EL) model; Next, applies the MMC technology to the high-voltage side of the MMC-PET isolation stage to improve the power supply reliability of the isolation stage, and adopts a PI-based phase-shift control strategy; then, for the MMC-PET output stage, this paper designs an inner loop current passive controller based on the EL model. Finally, an MMC-PET system that supplies power to the passive network is established in Matlab/Simulink. When the grid voltage fails, software simulation experiments are performed to verify the MMC-PET system that supplies power to the passive network. The experimental results show that the control strategy of the MMC-PET system has good dynamic control performance. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：121 / 128
页数：7
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