Ultra-High-Speed Travelling Wave Protection of Transmission Line Using Polarity Comparison Principle Based on Empirical Mode Decomposition
Ultra-High-Speed Travelling Wave Protection of Transmission Line Using Polarity Comparison Principle Based on Empirical Mode Decomposition
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DOI：
10.1155/2015/195170
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发表时间：
2015-10
影响因子：
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通讯作者：
Dong Wang;Houlei Gao;Sibei Luo;G. Zou
中科院分区：
文献类型：
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作者：
Dong Wang;Houlei Gao;Sibei Luo;G. Zou
传统的基于极性比较法的行波保护利用的是初始波信息，受初始故障角、母线结构和外部故障的影响。忽略了行波的大小和极性之间的关系。由于保护跳闸和误动，影响了该保护原理的进一步应用。为此，本文提出了一种基于积分比极性原理的超高速行波保护方案。对原始行波进行经验模式分解后，以一阶固有模式函数作为保护对象。根据行波震级与行波极性之间的关系，论证了用包含极性信息的行波震级作为方向判据的可行性。并在故障发生后的一段时间内综合方向判据，避免波头检测失败。通过对典型500kV输电系统的PSCAD仿真，验证了行波保护在不同因素影响下的可靠性和灵敏度。
The traditional polarity comparison based travelling wave protection, using the initial wave information, is affected by initial fault angle, bus structure, and external fault. And the relationship between the magnitude and polarity of travelling wave is ignored. Because of the protection tripping and malfunction, the further application of this protection principle is affected. Therefore, this paper presents an ultra-high-speed travelling wave protection using integral based polarity comparison principle. After empirical mode decomposition of the original travelling wave, the first-order intrinsic mode function is used as protection object. Based on the relationship between the magnitude and polarity of travelling wave, this paper demonstrates the feasibility of using travelling wave magnitude which contains polar information as direction criterion. And the paper integrates the direction criterion in a period after fault to avoid wave head detection failure. Through PSCAD simulation with the typical 500 kV transmission system, the reliability and sensitivity of travelling wave protection were verified under different factors’ affection.