首页|Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems

Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems

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Distinction of weak and strong AC grids for emerg-ing hierarchical-infeed LCC-UHVDC systems is important for planning and operation departments.However,accuracy of earlier distinction methods is limited as they were developed by empirical reasoning without rigorous theoretical analysis.Hence in this letter,hierarchical-infeed interactive effective short-circuit ratio(HIESCR)index is first used for strength evaluation of HIDC systems with complex inter-inverter interactions con-sidered.Boundary HIESCR(BHIESCR)is also introduced in the proposed distinction method of weak and strong AC grids.That is,weak(or strong)AC grids are,respectively,identified when HIESCR is less(or greater)than BHIESCR.Second,it is shown BHIESCR remains almost unchanged as 3.0 versus various system parameters and rated operation variables based on rigorous theoretical analysis.This salient feature makes the proposed method more accurate than earlier methods.Finally,the proposed method is validated by simulations based on the PSCAD/EMTDC program.

Hierarchical-Infeed interactive effective short-circuit ratiohierarchical-infeed LCC-UHVDC systemsinter-inverter interactionsstrong AC gridsweak AC grids

Hao Xiao、Xianzhong Duan、Yi Zhang

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Department of Electrical and Computer Engineering,University of Manitoba,Winnipeg R3T 2N2,Manitoba,Canada

State Key Laboratory of Advanced Electromag-netic Engineering and Technology,Hubei Electric Power Security and High Efficiency Key Laboratory,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China

RTDS Technologies Inc.,Winnipeg R3T 2E1,Manitoba,Canada

国家自然科学基金Industrial Research Chair Program of the Natural Sciences and Engineering Research Council of Canada

51907067

2024

10.17775/CSEEJPES.2022.08580

中国电机工程学会电力与能源系统学报(英文版)
中国电机工程学会

中国电机工程学会电力与能源系统学报(英文版)

CSTPCDEI
ISSN：2096-0042
年,卷(期)：2024.10(2)
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