| 引用本文: | 卞欣科,李 勇,林 刚,等.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(08):153-164. |
| BIAN Xinke,LI Yong,LIN Gang,et al.Non-intrusive dynamic identification of wideband impedance characteristics of LCC receiving-end grids under multiple operating conditions[J].Power System Protection and Control,2026,54(08):153-164 |
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| 摘要: |
| 随着常规高压直流输电系统(line commutated converter based high voltage direct current, LCC-HVDC)受端的电
力电子设备渗透率增加，并网点电气信号呈时变特征，导致系统宽频谐振风险日益突出。针对 LCC-HVDC 受端
网侧灰箱化背景下传统阻抗辨识方法工况适应性差、量测频带窄的问题，提出一种受端电网多工况宽频阻抗非侵
入动态辨识方法。首先，通过建立 LCC-HVDC 受端等效宽频阻抗模型，基于并网点端口信号，利用同步挤压小
波变换提取宽频动态特征。然后，采用改进卡尔曼滤波算法实现特征信息的快速融合与阻抗时频域估计，从而无
需外源扰动即可动态追踪电网宽频阻抗。最后，对 LCC-HVDC 系统的宽频阻抗及谐振风险进行辨识，并利用广
义奈奎斯特曲线与时域仿真方法，验证阻抗特征辨识与宽频谐振风险评估的有效性。 |
| 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 |
| DOI：10.19783/j.cnki.pspc.251028 |
| 分类号: |
| 基金项目:国家自然科学基金企业创新发展联合基金项目（U25B6019）；湖南省科技创新计划项目（2023RC1038）；宁夏 - 湖南 ±800 kV 特高压直流输电工程科研项目（SGZB0000TGJS2300786） |
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| Non-intrusive dynamic identification of wideband impedance characteristics of LCC receiving-end grids under multiple operating conditions |
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BIAN Xinke, LI Yong, LIN Gang, ZHANG Yi, HUANG Caowei, FU Ying
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1. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China；2. RTDS Technologies, Winnipeg R3T 5V6, Canada；3. State Grid Corporation of China, Beijing 100032, China
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| 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. |
| Key words: wideband impedance LCC-HVDC non-intrusive measurement multi-operating condition dynamic identification improved Kalman filtering |
