Reliability Evaluation of UHVDC Transmission Systems with a Hierarchical Connection Mode  

作　　者：Shenghu Li Zhengyang Wu Yuting Hua 

机构地区：[1]School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China

出　　处：《CSEE Journal of Power and Energy Systems》2019年第1期73-81,共9页中国电机工程学会电力与能源系统学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant 51637004.

摘　　要：Compared with the typical Ultra HVDC(UHVDC)system,the inverters of the UHVDC system with a hierarchical connection mode(UHVDC-HCM),connect two receiving-end systems with different operational conditions.This requires the corresponding conversion units(CUs)at the different terminals to be differentiated in reliability modeling,and the spares should also be separately set.A reliability model of the UHVDCHCM system is proposed in this paper.The operating modes are classified by the capacities of the total system and the transmission powers to the two receiving-ends.Considering the independent spares of the components of the CUs at different terminals,the state space is derived.Two sets of indices are newly proposed to more accurately evaluate the system reliability.Based on the matrix description of the frequency&duration(F&D)method,the sensitivities of the reliability indices to the reliability parameters of the components are quantified.Numerical results validate the feasibility of the proposed model.The vulnerabilities are recognized by the sensitivity analysis,and the impact of different spare schemes on the reliability indices and sensitivities are compared.The proposed model and indices provide a reference for the practical UHVDC-HCM projects.

关 键 词：Frequency&duration(F&D) hierarchical connection reliability indices reliability model Ultra HVDC(UHVDC) 

分 类 号：TM7[电气工程—电力系统及自动化]