中国电机工程学报2025，Vol.45Issue(7)：2447-2460,中插1,15.DOI:10.13334/j.0258-8013.pcsee.232277
基于特征子系统的广义短路比导出原理及计算方法
Derivation Principle and Calculation Method of Generalized Short-circuit Ratio Based on Eigen-subsystems
摘要
Abstract
With the large-scale integration of renewable energy sources and grid-following power electronic devices,the voltage support strength of power systems decreases dramatically,posing threats to the secure and stable operation of the new type power system.In the scenario where homogeneous power electronic devices are integrated into the system,the so-called generalized short-circuit ratio(gSCR)of the power network and the critical short-circuit ratio(SCR0)of the device/stations can be used to quantitatively evaluate the voltage support strength of the system.Such a method is highly related to the system stability.In the scenario where heterogeneous power electronic devices(exhibiting weakly different dynamics)are integrated into the system,the voltage support strength can be quantified by the first-order approximation of gSCR and SCR0,utilizing the special characteristics of the devices and the power grid.However,there is still a lack of unified derivation principles and calculation methods to handle the heterogeneous cases.To this end,this paper focuses on quantifying the voltage support strength of the system with respect to small-signal stability.We found that the multi-infeed system can be approximately decoupled into multiple low-dimensional systems.On this basis,we propose the concepts of eigen-subsystem and its calculation method,and further interpret their physical meaning.Based on the concept of eigen-subsystems,the generalized derivation principle and calculation methods of gSCR and SCR0 are proposed.Additionally,the specific calculation methods for these metrics are provided when considering grid-following converters under non-rated operating conditions,reverse active power outputs,and grid-forming devices.Finally,the effectiveness of the principles and methods is verified in numerical case studies.关键词
广义短路比/装备/场站临界短路比/特征子系统Key words
generalized short-circuit ratio/device or station critical short-circuit ratio/eigen-subsystem分类
动力与电气工程引用本文复制引用
辛焕海,刘晨曦,黄林彬,高晖胜,鞠平..基于特征子系统的广义短路比导出原理及计算方法[J].中国电机工程学报,2025,45(7):2447-2460,中插1,15.基金项目
国家自然科学基金项目(联合基金项目)(U22B6008,U2166204).Project Supported by National Natural Science Foundation of China(United Program)(U22B6008,U2166204). （联合基金项目）
