已有关于系统惯性时空分布(spatial-temporal distribution of system inertia，SDSI)的研究大多聚焦于惯量估计，而对其概念的表征并不统一，也缺乏对其性质的深入剖析与相关概念的系统梳理与辨析。该文试图探索大扰动下系统惯性时空分布特性的表征形式。基于频率动态过程分析剖析了惯性时空分布特性，提出系统节点惯量概念并给出该参量的性质描述参量，基于惯性物理机理提出了这些参量的量化分析方法并推导了相关系数的差分计算公式。仿真算例验证了对系统惯性时空分布特性所做的分析与判断，利用所提出的表征形式可全面而规范地表征系统惯性时空分布特征。研究可为电力系统惯性时空分布特性表征体系的构建提供参考。
A Preliminary Research on the Representation Form of Spatial-temporal Distribution Characteristics of Power System Inertia Under Large Disturbances
Most studies on the spatial-temporal distribution of system inertia(SDSI)have focused on inertia estimation.Meanwhile,the representation of the concept of system inertia is not unified and lack the in-depth analysis of its characteristics and the systematic sorting and analysis of related concepts.This paper attempts to explore the representation form of the SDSI characteristics under large disturbances.The SDSI characteristics is analyzed based on frequency dynamic process analysis.The concept of quantity of system nodal inertia is proposed and its characteristic description parameters are given.A quantitative analysis method of these parameters is proposed based on the physical mechanism of inertia and the difference calculation formula of the correlation coefficient is derived.A simulation example is given to verify the analysis and judgment of the SDSI characteristics,which can be characterized comprehensively and normally by the proposed representation form.
power systemsystem inertiaspatial-temporal distribution characteristicsrepresentation formquantity of system nodal inertia
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