基于 GST-TT 变换的单端故障行波测距方法
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TN98;TM935

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国家自然科学基金(51974151)、辽宁省教育厅重点实验室项目(LJZS003)资助


Single-ended fault traveling wave ranging method based on GST-TT transform
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    摘要:

    针对行波法测距波头时刻标定精度不足和波速不稳定的问题,提出一种基于 GST-TT 变换的单端故障行波测距方法。 首先将采样的电压行波信号做解耦处理,提取线模电压信号,然后将线模电压信号进行广义 S 变换,提取适当高频频带作为故 障特征频带,运用 TT 变换对角线位置元素聚高频、抑制低频的特性,在故障特征频带内对波头到达测量端时刻进行精确标定, 根据不依赖具体行波波速的故障测距计算方法得出故障距离。 该方法可以提高波头时刻的标定精度,降低波速不稳定对故障 测距的影响。 通过 PSCAD 仿真验证,根据结果可知,该方法测距精度较高,在无噪声干扰情况下,平均相对误差为 0. 25%;同时 也可知晓该方法具有较强的耐受过渡电阻能力和抗噪能力。

    Abstract:

    Aiming at the problem of insufficient accuracy of wave head time calibration and unstable wave velocity in traveling wave method, a single-ended fault traveling wave ranging method based on GST-TT transform is proposed. Firstly, the sampled voltage traveling wave signal is decoupled to extract the line mode voltage signal; Secondly, the line mode voltage signal is S-transformed in general; Thirdly, the appropriate high-frequency band is extracted as the fault characteristic band; Fourthly, Using high-frequency aggregation and low-frequency suppression characteristics of TT transform’s diagonal position elements, the arrival time of the wave head at the measuring end is accurately calibrated in the fault characteristic band; Lastly, the fault distance is obtained based on the fault ranging calculation method which does not depend on the specific traveling wave velocity. The method can improve the calibration accuracy of the wave head time and reduce the influence of the wave speed instability on the fault location. The PSCAD simulation proves that the method has high accuracy and the average relative error is 0. 25% in the absence of noise interference. It also has strong tolerance to transition resistance and anti-noise ability.

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徐耀松,徐才宝,唐 维,徐 胜.基于 GST-TT 变换的单端故障行波测距方法[J].电子测量与仪器学报,2020,34(7):42-49

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  • 在线发布日期: 2023-11-20
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