电力系统动态安全性与故障位置密切相关，故障位置特征的准确表达是构建数据驱动动态安全评估模型的关键。该文基于电气坐标形式的故障位置特征表达方法，提出故障位置特征严格距离保持概念，构建计及故障位置特征距离保持的动态安全评估模型。首先，证明全维电气坐标在切比雪夫距离度量下满足严格距离保持要求。然后，分析切比雪夫距离度量下电气坐标的距离保持能力与电气坐标维数间的关系。最后，基于 K 近邻算法构建计及电气坐标距离保持能力的暂态稳定极限切除时间评估模型。以某省级电网为例，验证故障位置电气坐标距离保持能力对动态安全评估精度的贡献。
Distance Preservation of Electrical Coordinate for Fault Location Feature Representation in Intelligent Dynamic Security Assessment
Power system dynamic security is strongly related to fault location.Accurate feature representation of fault location is crucial for developing a data-driven dynamic security assessment model.Based on the fault location representation method of electrical coordinate,this paper proposes the concept of strict distance preservation of fault location features and establishes the dynamic security assessment model considering distance preservation for fault location features.First,the full-dimensional electrical coordinate is proved to meet strict distance preservation under Chebyshev distance metric.Then,the relationship between the distance preservability of electrical coordinate and the dimension of the electrical coordinate under Chebyshev distance metric is analyzed.Finally,the assessment model of transient stability critical clearing time considering distance preservability is constructed based on K-nearest neighbor algorithm.With a provincial power grid as an example,the contribution of electrical coordinate distance preservability to the accuracy of dynamic security assessment is verified.
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