Grid Strength Assessment for Inhomogeneous Multi-infeed HVDC Systems via Generalized Short Circuit Ratio

作     者：Guanzhong Wang Huanhai Xin Di Wu Zhiyi Li Ping Ju Guanzhong Wang;Huanhai Xin;Di Wu;Zhiyi Li;Ping Ju

作者机构：Department of Electrical EngineeringZhejiang UniversityHangzhou 310027China Department of Electrical and Computer EngineeringNorth Dakota State UniversityFargo 58102USA College of Energy and Electrical EngineeringHohai UniversityNanjing 211100China Department of Electrical EngineeringZhejiang UniversityHangzhou310027China 

出 版 物：《现代电力系统与清洁能源学报(英文)》 (Journal of Modern Power Systems and Clean Energy)

年 卷 期：2023年第11卷第4期

页      面：1370-1374页

核心收录：

学科分类：0808[工学-电气工程] 080802[工学-电力系统及其自动化] 08[工学] 

基　　金：jointly supported by the National Natural Science Foundation of China(No.52007163) China Postdoctoral Science Foundation(No.2020M671718)。 

主　　题：Generalized short circuit ratio(gSCR) multiinfeed high-voltage direct current system modal perturbation static-voltage stability 

摘      要：Generalized short circuit ratio(g SCR)for grid strength assessment of multi-infeed high-voltage direct current(MIDC)systems is a rigorous theoretical extension of the traditional SCR,which enables SCR to be extended to MIDC systems.However,g SCR is originally based on the assumption of homogeneous MIDC systems,in which all high-voltage direct current(HVDC)converters have an identical control configuration,thus presenting challenges to applications of g SCR to inhomogeneous MIDC systems.To weaken this assumption,this paper applies matrix perturbation theory to explore the possibility of utilization of g SCR into inhomogeneous MIDC systems.Results of numerical experiments show that in inhomogeneous MIDC systems,the previously proposed g SCR can still be used without modification.However,critical g SCR(Cg SCR)must be redefined by considering the characteristics of control configurations of HVDC converter.Accordingly,the difference between g SCR and redefined Cg SCR can effectively quantify the pertinent AC grid strength in terms of the static-voltage stability margin.The performance of the proposed method is demonstrated in a triple-infeed inhomogeneous line commutated converter based high-voltage direct current(LCC-HVDC)system.