电力系统自动化2024，Vol.48Issue(13)：50-59,10.DOI:10.7500/AEPS20230814004
基于小扰动频率量测数据的电网节点惯量分布评估方法
Evaluation Method for Node Inertia Distribution of Power Grids Based on Small Disturbance Frequency Measurement Data
摘要
Abstract
Inertia plays a key role in the resistance of power system to disturbances.With the increase of renewable energy penetration,the characteristics of low inertia and uneven spatial and temporal distribution of inertia in the power system are becoming more and more prominent,and it is of great significance to accurately evaluate the node inertia distribution in the power grid.To this end,this paper proposes an evaluation method for node inertia distribution based on small disturbance frequency measurement data.First,the mathematical coupling mechanism between frequency and inertia is analyzed,and the inertia distribution characteristics of the new power system are revealed.Then,based on the frequency measurement data and system power supply parameters under a single small disturbance,a node equivalent inertia definition method considering the horizontal deviation of each node frequency compared to the change of the center frequency of the system,and a calculation method for the rate of change of the frequency of each node based on adaptive-order polynomial fitting are proposed,respectively.The node equivalent inertia can be calculated by combining the two methods under a single small disturbance.Further,in view of the fact that the node equivalent inertia calculated under a single small disturbance has a certain random error,a dynamic aggregation strategy that takes into account the evaluation results of multiple disturbance events is proposed,and an evaluation method for node equivalent inertia distribution applicable to the new power system is formed.Finally,the effectiveness of the proposed method is verified by taking the IEEE 39-bus system and a certain provincial power grid in China as cases.The results show that the proposed method requires a small amount of data,and only the frequency measurement data collected by the synchrophasor measurement unit at each node is needed to realize the effective evaluation of grid inertia distribution,and the evaluation results have high accuracy and strong timeliness.关键词
惯量分布/频率量测数据/小扰动/节点等效惯量/自适应阶数多项式拟合Key words
inertia distribution/frequency measurement data/small disturbance/node equivalent inertia/adaptive-order polynomial fitting引用本文复制引用
李勇,常樊睿,彭衍建,高酉松,周年光,禹海峰..基于小扰动频率量测数据的电网节点惯量分布评估方法[J].电力系统自动化,2024,48(13):50-59,10.基金项目
湖南创新型省份建设科技重大专项项目(2020GK1011) （2020GK1011）
国家自然科学基金资助项目(52207093) （52207093）
中国博士后科学基金资助项目(2021TQ0100,2022M721083). This work is supported by Key Science and Technology Special Projects of Hunan Innovation Province(No.2020GK1011),National Natural Science Foundation of China(No.52207093)and China Postdoctoral Science Foundation(No.2021TQ0100,No.2022M721083). （2021TQ0100,2022M721083）
