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

Hao Xiao; Xianzhong Duan; Yi Zhang

doi:10.17775/CSEEJPES.2022.08580

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

Regular Papers | 更新时间：2026-10-15

- 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
- 中国电机工程学会电力与能源系统学报(英文) 2024年10卷第2期页码：772-777
- 作者机构：
  
  1. Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, Manitoba,Canada
  2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Laboratory, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology,Hubei,Wuhan,China
  3. RTDS Technologies Inc., Winnipeg, Manitoba,Canada
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.08580
  中图分类号：
- 纸质出版：2024-03-01
- 稿件说明：
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Hao Xiao, Xianzhong Duan, Yi Zhang. Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems[J]. 中国电机工程学会电力与能源系统学报(英文), 2024,10(2):772-777.

Hao Xiao, Xianzhong Duan, Yi Zhang. Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems[J]. CSEE Journal of Power and Energy Systems, 2024, 10(2): 772-777.
Hao Xiao, Xianzhong Duan, Yi Zhang. Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems[J]. 中国电机工程学会电力与能源系统学报(英文), 2024,10(2):772-777. DOI： 10.17775/CSEEJPES.2022.08580.

Hao Xiao, Xianzhong Duan, Yi Zhang. Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems[J]. CSEE Journal of Power and Energy Systems, 2024, 10(2): 772-777. DOI： 10.17775/CSEEJPES.2022.08580.

摘要

Abstract

Distinction of weak and strong AC grids for emerging 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 considered. 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.

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