2025年7月26日 周六
Home > Archive>Volume , Issue 1, 2024 >234-242. DOI:10.19781/j.issn.1673-9140.2024.01.024
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Research on zero sequence current control strategy for suppressing internal oscillation of DC MMC send by wind power
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(1.Electric Power Research Institute of State Grid Inner Mongolia Eastern Electric Power Co., Ltd., Hohhot 010020, China; 2.School of Automation, Wuhan University of Technology, Wuhan 430070, China)

Clc Number:

TM863

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    Abstract:

    In this paper, the oscillation mode of wind power through DC transmission system is analyzed, and the interaction mechanism between the circulating current zero sequence component of MMC system internal oscillation and capacitor voltage is revealed. The mechanism of the internal oscillation of MMC system caused by the interaction between the zero sequence component of the circulating current and the capacitor voltage of MMC is revealed. The dynamic relationship between the total energy stored by the equivalent capacitance of each arm of the MMC system and the zero-sequence current is constructed. The differential modulus and the common modulus of the total energy stored by the equivalent capacitance of each arm of the MMC system are derived. The zero-sequence current control strategy is proposed. The dynamic model of the control strategy is constructed, and the oscillation mode of MMC system with zero sequence current control strategy is analyzed after considering the intermediate variables of the model. The results show that the proposed control strategy can make the real part of the oscillation mode move left and increase the total damping. The electromagnetic transient simulation model of wind power through DC transmission system with zero sequence current control strategy is constructed. The simulation results show that the proposed strategy greatly increases the damping level of the system, improving the stability.

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兰 月,王俊芳,窦宇宇,王新宇,杨 熠,刘荣顺.一种抑制风电送出直流MMC内部振荡的零序电流控制策略研究[J].电力科学与技术学报英文版,2024,(1):234-242. LAN Yue, WANG Junfang, DOU Yuyu, WANG Xinyu, YANG Yi, LIU Rongshun. Research on zero sequence current control strategy for suppressing internal oscillation of DC MMC send by wind power[J]. Journal of Electric Power Science and Technology,2024,(1):234-242.

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