基于电气距离的故障位置表征及其在暂态稳定评估中的应用

Representation of Fault Location Based on Electrical Distance and Its Application in Transient Stability Assessment

现有数据驱动的暂态稳定评估广泛利用发电负荷模式特征,未能充分反映故障位置对系统暂态稳定性的影响。文中基于电气距离提出了一种具备电气意义且连续的故障位置表征方法,并将其应用在暂态稳定评估中,实现了对故障位置的统一特征表达。首先,基于电气距离提出电气坐标系概念用于定量表征故障位置。然后,研究电气坐标系参考点优化方法,实现对故障位置特征的准确提取。最后,将所提故障位置表征方法应用到暂态稳定评估中,基于电气坐标系实现了暂态稳定评估中对故障位置的统一考虑,并在中国某省级电网算例下验证了所提方法的有效性。

Existing data-driven transient stability assessment makes extensive use of features of generation-load modes,but fails to fully reflect the influence of the fault location on the system transient stability.In this paper,a continuous fault location representation method with electrical meaning is proposed based on the electrical distance.The fault location representation method is applied to the transient stability assessment,which accomplishes the unified feature expression of fault locations.First,based on the electrical distance,the concept of the electrical coordinate system is proposed to represent fault location quantitatively.Then,the optimization method for reference points of the electrical coordinate system is studied,and the fault location features are extracted accurately.Finally,the proposed representation method of fault locations is applied to the transient stability assessment,and the fault location is considered uniformly based on the electrical coordinate system in the transient stability assessment.The validity of the proposed method is verified with a provincial power grid in China as the example.