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首页> 外文期刊>International Journal of Electrical Power & Energy Systems >A novel non-unit transient based boundary protection for HVDC transmission lines using synchrosqueezing wavelet transform
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A novel non-unit transient based boundary protection for HVDC transmission lines using synchrosqueezing wavelet transform

机译：基于小波变换的高压直流输电线路基于暂态暂态的新型边界保护

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摘要

Since high voltage direct current (HVDC) transmission system takes on significant tasks in coordinating the power grids asynchronous interconnection and the comprehensive utilization of energy resources, the reliable and fast faults clearance to guarantee the safety and stability of the power system should be attached great attention. This paper, based on the analysis of the HVDC boundary characteristics, proposes a novel non-unit transient based boundary protection as the main protection for HVDC transmission lines, and uses the novel synchrosqueezing wavelet transform (SWT) for time-frequency (T-F) representation. By synchrosqueezing and reassigning the T-F spectrum of the continuous wavelet transform (CWT), SWT can obtain a high resolution T-F spectrum, which brings higher reliability to protection. Based on the transmission differences between tuning voltage and low-frequency voltage by the boundary, this paper proposes the SWT-based non-unit transient boundary protection algorithm, and the ratio of the positive and negative voltage micro-increment is used to select the faulty line. Extensive PSCAD simulations of +/- 800 kV HVDC project and some field data are used to test the proposed protection scheme. Compared with the CWT-based boundary protection, experimental results verified the proposed method could perform rapidly and reliably in various types of fault, especially can be immune to commutation failure and shows good performance for switching operation as well as fault closer to the very begging of the line, and with high selectivity and sensitivity.
机译：由于高压直流输电系统在协调电网异步互联和能源综合利用方面担负着重要的任务，因此应高度重视可靠，快速的故障排除，以确保电力系统的安全性和稳定性。 。本文在分析高压直流输电边界特性的基础上，提出了一种基于非单位暂态的新型边界保护作为高压直流输电线路的主要保护措施，并采用新型的同步压缩小波变换（SWT）进行时频（TF）表示。 。通过对连续小波变换（CWT）的T-F频谱进行同步压缩和重新分配，SWT可以获得高分辨率的T-F频谱，从而为保护带来更高的可靠性。针对边界上调谐电压与低频电压的传输差异，提出了基于SWT的非单位暂态边界保护算法，并利用正负微比例来选择故障点。线。 +/- 800 kV HVDC项目的广泛PSCAD仿真和一些现场数据用于测试所提出的保护方案。与基于CWT的边界保护相比，实验结果证明了该方法在各种类型的故障中都能快速，可靠地执行，特别是对换相失败具有免疫力，并且在切换操作以及故障更接近于乞讨时表现出良好的性能。生产线，具有很高的选择性和灵敏度。

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