黎钊, 郑宇超, 林湘宁, 童宁, 魏繁荣, 肖澍昱. 基于波形相似度特征的多端柔直电网故障自适应重合闸方案[J]. 高电压技术, 2023, 49(3): 1326-1339. DOI: 10.13336/j.1003-6520.hve.20211836
引用本文: 黎钊, 郑宇超, 林湘宁, 童宁, 魏繁荣, 肖澍昱. 基于波形相似度特征的多端柔直电网故障自适应重合闸方案[J]. 高电压技术, 2023, 49(3): 1326-1339. DOI: 10.13336/j.1003-6520.hve.20211836
LI Zhao, ZHENG Yuchao, LIN Xiangning, TONG Ning, WEI Fanrong, XIAO Shuyu. Adaptive Reclosing Scheme for VSC-MTDC Line Based on the Transient Current Waveform Similarity Matching[J]. High Voltage Engineering, 2023, 49(3): 1326-1339. DOI: 10.13336/j.1003-6520.hve.20211836
Citation: LI Zhao, ZHENG Yuchao, LIN Xiangning, TONG Ning, WEI Fanrong, XIAO Shuyu. Adaptive Reclosing Scheme for VSC-MTDC Line Based on the Transient Current Waveform Similarity Matching[J]. High Voltage Engineering, 2023, 49(3): 1326-1339. DOI: 10.13336/j.1003-6520.hve.20211836

基于波形相似度特征的多端柔直电网故障自适应重合闸方案

Adaptive Reclosing Scheme for VSC-MTDC Line Based on the Transient Current Waveform Similarity Matching

  • 摘要: 针对多端柔性直流电网工程中架空线路重合闸原理缺乏选择性、容易重合于永久性故障而造成二次冲击的问题,当前已有一系列基于单端量的重合闸原理,但是此类重合闸原理存在全线耐受过渡电阻能力不足甚至在区内两端存在死区的问题。此外,有些保护方案在注入判别信号时还存在需要增设附加装置或辅助控制方式的缺点。为此,尝试通过双端量通信的方式解决上述问题。首先,分析了瞬时性故障与永久性故障下的对侧线模行波的故障特点;随后,结合不同故障性质的特点得出了对侧线模电流推演值与测量值间波形相似度的差异性,并提出一种基于Hausdorff距离算法的相似度差异性量化方法;得益于双端量判别方式对注入信号形态的要求较单端方式大为降低,提出了一种无需增设附加装置或辅助控制的直流断路器(DCCB)注入信号生成方式;最后,形成了一种基于波形相似度特征匹配的自适应重合闸方案。仿真结果表明所提重合闸判据有效保护范围可覆盖线路全长、有较高耐受过渡电阻能力、并具有良好的适用性。

     

    Abstract: In view of the problem that overhead line reclosing principle is lacking in selectivity and easy to recolse on permanent faults in multi-terminal flexible DC (MTDC), many experts have proposed a series of single-terminal reclosing principles. However, the resistive coverage for each side of a protection element is not always identical, even there are dead zones at both ends of the zone. Besides, some reclosing schemes need additional devices or auxiliary control methods when injecting discriminant signals. Therefore, this paper tries to solve the above problems by means communication. Firstly, the fault characteristics of temporary fault and permanent fault are analyzed. And the waveform similarity difference between the deduced value and the measured value of linear mode current is obtained by comparing and analyzing the characteristics of different fault properties. Then, the waveform similarity characteristics are analyzed by the Hausdorff distance algorithm and a signal injection time sequence of DC circuit breakers(DCCB) without additional devices or auxiliary controls are proposed.Finally, an adaptive reclosing scheme based on the transient current waveform similarity matching is proposed. A large number of simulation results show that the protective reach of reclosing criterion proposed in this paper can cover the entire transmission line, with high sensitivity and well applicability.

     

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