| 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 |
| 基于 GST-TT 变换的单端故障行波测距方法 |
| Single-ended fault traveling wave ranging method based on GST-TT transform |
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| DOI： |
| 中文关键词: 高压直流 广义 S 变换 TT 变换 波头时刻标定 故障测距 |
| 英文关键词:HVDC GST TT transform wave head calibration fault location |
| 基金项目: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 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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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