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首页> 外文会议>2014 International Conference on Power System Technology: Towards Green, Efficient and Smart Power System >Improved protection method of HVDC transmission line based on the analysis of traveling wave dispersion
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Improved protection method of HVDC transmission line based on the analysis of traveling wave dispersion

机译：基于行波色散分析的高压直流输电线路改进保护方法

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摘要

The research on propagation characteristic of fault traveling wave are almost based on uniform lossless transmission line model, without considering the traveling wave dispersion resulted from the frequency dependent characteristic of transmission line, which distorts the wave front and increases the difficulty to detect the wave front. The traveling wave dispersion mainly affects the common mode component of traveling wave, whereas the differential mode component almost has no traveling wave dispersion problem. In order to eliminate the influence of traveling wave dispersion on protection, this paper uses only the differential mode of pole wave as the protection criterion. Based on the PSCAD/EMTDC simulation platform and practical HVDC transmission project, the performance of differential mode component criterion and the currently used DC line protection criterion is compared in this paper, which includes the steepness of wave front, the sensitivity to detect fault and the reliability with long fault location and high fault impedance. It is shown that the differential mode component criterion has better performance than the currently used DC line protection criterion, for the new protection criterion has steeper wave front and is more sensitive to detect the fault. For the same sensitivity requirement, the new protection criterion can act correctly under much higher fault impedance, and remoter fault location, which improves the reliability of protection.
机译：故障行波传播特性的研究几乎是基于均匀的无损传输线模型，没有考虑传输线的频率相关特性引起的行波频散，这会使波前畸变，增加了检测波前的难度。行波色散主要影响行波的共模分量，而差模分量几乎没有行波色散问题。为了消除行波色散对保护的影响，本文仅以极波的差模作为保护准则。基于PSCAD / EMTDC仿真平台和实际的高压直流输电项目，比较了差模分量判据和目前使用的直流线路保护判据的性能，包括波前的陡度，故障检测的敏感性和故障率。故障位置长，故障阻抗高，可靠性高。结果表明，由于新的保护准则具有更陡的波阵面并且对故障的检测更加敏感，因此差模分量准则的性能优于目前使用的直流线路保护准则。对于相同的灵敏度要求，新的保护标准可以在更高的故障阻抗和更远的故障位置下正确运行，从而提高了保护的可靠性。

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