中国电机工程学报2026，Vol.46Issue(10)：3981-3994,中插5,15.DOI:10.13334/j.0258-8013.pcsee.250241
基于广义短路比的LCC/VSC混合多馈入系统小干扰稳定分析
Small Signal Stability Analysis of LCC/VSC Hybrid Multi-infeed HVDC System Based on Generalized Short Circuit Ratio
摘要
Abstract
The configuration of hybrid receiving-end power grids fed by both line commutated converter based high voltage direct current(LCC-HVDC)and voltage source converter based HVDC(VSC-HVDC)systems is emerging,and accurately quantifying the stability margin of hybrid multi-infeed systems is crucial.The short-circuit ratio is often used to describe voltage stability margins in traditional LCC-HVDC multi-infeed systems.However,in hybrid multi-infeed systems,the mechanism and definition of the short circuit ratio(SCR)remain unclear.To address this issue,this paper proposes a method for quantifying the stability margin of hybrid multi-infeed systems based on the generalized SCR(gSCR)from the perspective of small-signal stability.Firstly,a small-signal admittance model for LCC-HVDC is established,and the impact of the phase-locked loop on the small-signal stability of LCC-HVDC is investigated using the synchronous dominant loop method.Secondly,the maximum singular value of the impedance matrix of VSC-HVDC is utilized in characterizing the voltage support capability of VSC-HVDC in hybrid multi-infeed systems.Finally,the gSCR is extended to hybrid multi-infeed systems,and a quantitative assessment method for the small-signal stability margin of hybrid multi-infeed systems is proposed.Simulation examples verify the effectiveness of the proposed method.关键词
混合多馈入系统/小干扰稳定/广义短路比/构网型变流器Key words
hybrid multi-infeed DC system/small signal stability/generalized short circuit ratio(gSCR)/grid-forming converters分类
信息技术与安全科学引用本文复制引用
王奕鑫,刘晓颖,汪莹,华文,辛焕海,黄林彬..基于广义短路比的LCC/VSC混合多馈入系统小干扰稳定分析[J].中国电机工程学报,2026,46(10):3981-3994,中插5,15.基金项目
智能电网国家科技重大专项(2024ZD0801000) （2024ZD0801000）
国网浙江省电力有限公司科技项目(B311DS25000A).Smart Grid-National Science and Technology Major Project(2030)(2024ZD0801000) （B311DS25000A）
The Science and Technology Project of State Grid Zhejiang Electric Power Co.,Ltd.(B311DS25000A). （B311DS25000A）
