Revealing the mechanism of subsynchronous torsional interaction caused by LCC-HVDC from the perspective of vector synchronization

IF 5 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Electrical Power & Energy Systems Pub Date : 2024-07-27 DOI:10.1016/j.ijepes.2024.110153

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引用次数: 0

Abstract

Line-commutated converter-based high voltage direct current transmission (LCC-HVDC) has been widely applied worldwide due to its great advantages in realizing long-distance and large-capacity power transmission. However, it may also lead to instability problems, including subsynchronous torsional interaction (SSTI). This destructive phenomenon greatly threatens the safe and stable operation of power systems and has been widely concerned since the 1970 s. Existing literature has found that SSTI is caused by DC current control of rectifier station. However, the physical mechanism of this phenomenon has not been clarified clearly, which hampers further understanding of how negative damping is generated and whether it is evitable. To fill this gap, the physical process of SSTI caused by LCC-HVDC is clarified through the perspective of vector synchronization. Based on this, the negative damping mechanism is revealed. The influence of control on damping is also studied with the contribution of different control loops quantified. All results are verified through time-domain simulations and damping torque analysis.

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从矢量同步的角度揭示 LCC-HVDC 引起的次同步扭转相互作用的机理

基于线路换流器的高压直流输电（LCC-HVDC）在实现长距离、大容量输电方面具有巨大优势，已在全球范围内得到广泛应用。然而，它也可能导致不稳定问题，包括次同步扭转相互作用（SSTI）。这一破坏性现象极大地威胁着电力系统的安全稳定运行，自 20 世纪 70 年代以来一直受到广泛关注。现有文献发现，SSTI 是由整流站的直流电流控制引起的。然而，这一现象的物理机理尚未明确，这妨碍了人们进一步了解负阻尼是如何产生的，以及负阻尼是否可以避免。为了填补这一空白，本文从矢量同步的角度阐明了 LCC-HVDC 引起 SSTI 的物理过程。在此基础上，揭示了负阻尼机制。此外，还研究了控制对阻尼的影响，并量化了不同控制回路的贡献。所有结果均通过时域模拟和阻尼力矩分析得到验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Electrical Power & Energy Systems 工程技术-工程：电子与电气

CiteScore

12.10

自引率

17.30%

发文量

1022

审稿时长

51 days

期刊介绍： The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.