Research on voltage coordination recovery strategy of multi-outfeed and multi-infeed UHVDC transmission system with similar path

2022 Asian Conference on Frontiers of Power and Energy (ACFPE) Pub Date : 2022-10-01 DOI:10.1109/ACFPE56003.2022.9952341

Xueyang Zhao, Jianbo Yi, Chenghao Li, Yufei Rao

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Abstract

On the basis of multi-infeed at the receiving end, some of the DC grid structures in China further reduce the electrical distance between the rectifier stations, forming a multi-outfeed and multi-infeed ultra-high voltage direct current (MOMIDC) transmission system with similar path. The complex AC-DC and AC-AC coupling characteristics of the MOMIDC system increase the control difficulty of the system voltage stability. This paper proposes the multi-outfeed and multi-infeed interaction factor (MOMI_IF) by analyzing the limitations of multi-infeed interaction factor (MIIF) in the MOMIDC system, and further deduces the multi-outfeed and multi-infeed voltage recovery intensity factor (MOMI_VRIF) on this basis. In addition, this paper also proposes a multi-level low voltage dependent current order limiter (VDCOL) coordination recovery strategy, which is based on the MOMI_VRIF. After simplifying the MOMIDC system by Thevenin equivalent, the author builds an electromagnetic transient model of a typical MOMIDC transmission system based on PSCAD and uses this model to simulate and verify the strategy in this paper

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相似路径下多出多进特高压直流输电系统电压协调恢复策略研究

中国部分直流电网结构在接收端多进给的基础上，进一步缩小整流站之间的电气距离，形成多出多进的路径相似的特高压直流输电系统。MOMIDC系统复杂的交直流和交流耦合特性增加了系统电压稳定性的控制难度。本文通过分析MOMIDC系统中多进多出交互因子(MIIF)的局限性，提出了多出多进交互因子(MOMI_IF)，并在此基础上进一步推导出多出多进电压恢复强度因子(MOMI_VRIF)。此外，本文还提出了一种基于MOMI_VRIF的多级低电压依赖限流器(VDCOL)协调恢复策略。在对MOMIDC系统进行Thevenin等效简化后，作者建立了基于PSCAD的典型MOMIDC传输系统的电磁暂态模型，并用该模型对本文的策略进行了仿真和验证

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2022 Asian Conference on Frontiers of Power and Energy (ACFPE)

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