公开(公告)号：US20220196713A1

公开(公告)日：2022-06-23

申请号：US17544338

申请日：2021-12-07

申请人： Hunan University

发明人： Yunfeng WEN ,  Yuanchen LI ,  Xiaohuang LIN ,  Li KUANG

IPC分类号： G01R21/133 ,  H02J3/00

摘要： A method and device for estimating spatial distribution of power system inertia based on multi-innovation identification. The method includes: (S1) acquiring time-series data including each node frequency of a power system and a transmission power of a transmission line; decomposing a frequency signal in a series of different spaces to identify a disturbance occurring moment; (S2) analyzing a relationship among node inertia, node frequency and node injection power; constructing an OEMA model to describe an active power-frequency dynamic process of the node after the disturbance occurs; analyzing a coupling relationship between an unknown parameter of the model and the node inertia; (S3) solving the OEMA model based on multi-innovation identification to identity the unknown parameter; and (S4) according to the relationship between a vector of the parameter and the node inertia, calculating each node inertia to estimate the spatial distribution of the power system inertia.

公开(公告)号：US20220368133A1

公开(公告)日：2022-11-17

申请号：US17873855

申请日：2022-07-26

申请人： Hunan University

发明人： Yunfeng WEN ,  Wuqi ZHANG ,  Wei GUO

IPC分类号： H02J3/24

摘要： A method and a system for evaluating inertia of a power system and a storage medium. The method includes: injecting a cosine active power disturbance into the power system by small-disturbance injection, and obtaining frequency response at a node where the disturbance is injected, where the active power disturbance can be an energy storage, wind power, or photovoltaic power; acquiring an evaluation framework of inertia and frequency regulation capability of the power system according to relative characteristics of a frequency response function; and constructing a mathematical relationship between the impedance and frequency response characteristics according to a relationship among active power disturbance, frequency fluctuation and impedance.