In addition, line mode and zero-mode voltage wave cross each other at the point of fault which causes the natural frequency "aliasing".

此外，故障电压行波于非对称短路点发生线模与零模行波相互交叉透射，致使故障电压自然频率“混叠”。

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Sag state estimation observability analysis is modeled and correlative modification method is proposed from the point of fault current superimposing firstly.

基于故障电流叠加原理，构造了电压跌落状态估计可观性分析的数学模型，合理地解决了部分故障路段不可观的问题。

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In point of fault prediction, neural network based combination prediction is studied in the paper in which the best combining of traditional prediction methods is given by neural network.

本文从故障预报角度研究了神经网络组合预报模型，由神经网络给出常规预报方法的最佳组合。

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In point of fault prediction, neural network based combination prediction is studied in the paper in which the best combining of traditional prediction methods is given by neural network.

本文从故障预报角度研究了神经网络组合预报模型，由神经网络给出常规预报方法的最佳组合。

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