电力系统保护与控制2026，Vol.54Issue(8)：153-164,12.DOI:10.19783/j.cnki.pspc.251028
LCC受端电网多工况宽频阻抗特性的非侵入动态辨识
Non-intrusive dynamic identification of wideband impedance characteristics of LCC receiving-end grids under multiple operating conditions
摘要
Abstract
With the increasing penetration of power electronics at the receiving end of line-commutated converter based high voltage direct current(LCC-HVDC)systems,the electrical signals at the point of common coupling show time-varying behavior,leading to growing wideband resonance risks in the system.To address the poor adaptability and narrow measurement bandwidth of traditional impedance identification methods under the gray-box modeling context of the LCC-HVDC receiving-end grid,this paper proposes a non-intrusive dynamic wideband impedance identification method under multiple operation conditions.First,an equivalent wideband impedance model of the LCC-HVDC receiving-end system is established.Based on the port signals at the grid connection point,synchrosqueezed wavelet transform is applied to extract wideband dynamic features.Then,an improved Kalman filtering algorithm is adopted to achieve rapid fusion of feature information and time-frequency domain estimation of impedance,enabling dynamic tracking of the grid wideband impedance without external disturbance.Finally,the wideband impedance characteristics and resonance risks of the LCC-HVDC system are identified.The effectiveness of the proposed method in impedance characterization and wideband resonance risk assessment is verified using generalized Nyquist curves and time-domain simulations.关键词
宽频阻抗/LCC-HVDC/非侵入式测量/多工况动态辨识/改进卡尔曼滤波Key words
wideband impedance/LCC-HVDC/non-intrusive measurement/multi-operating condition dynamic identification/improved Kalman filtering引用本文复制引用
卞欣科,李勇,林刚,张益,黄曹炜,付颖..LCC受端电网多工况宽频阻抗特性的非侵入动态辨识[J].电力系统保护与控制,2026,54(8):153-164,12.基金项目
This work is supported by the Joint Fund of National Natural Science Foundation of China for Enterprise Innovation and Development(No.U25B6019). 国家自然科学基金企业创新发展联合基金项目资助(U25B6019) （No.U25B6019）
湖南省科技创新计划项目资助(2023RC1038) （2023RC1038）
宁夏-湖南±800 kV 特高压直流输电工程科研项目资助(SGZB0000TGJS2300786) （SGZB0000TGJS2300786）
中原电气实验室面上科研项目资助 （）
