Unified Impedance Model of Four-Port Network for Bipolar Overhead Lines in Parallel Multi-Terminal DC Transmission System

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery Pub Date : 2025-03-18 DOI:10.1109/TPWRD.2025.3552637

Shunliang Wang;Qi Yin;Tianyu Chang;Junpeng Ma;Hao Tu;Maolan Peng

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Abstract

There are various operating modes of parallel bipolar multi-terminal DC transmission systems, among which there is an asymmetric condition of unipolar-bipolar hybrid form. In this case, the distribution of harmonics on the line is different from the normal case, and the equivalent impedance of the mode-domain loops obtained by pole-mode transformation is changed. To solve the problem of harmonic analysis on the DC side under asymmetric conditions, a unified impedance model for bipolar DC overhead lines applicable to various conditions is proposed. Firstly, the decoupling model and equivalent circuit of the mode domain of bipolar symmetrical lines are explained. Then, the limitations of the mode-domain component superposition calculation method in the analysis with asymmetric conditions are revealed. On this basis, from the perspective of the dual input and dual output port network of bipolar DC lines, the four-port pole-mode conversion relationship and fourth-order transformation matrix of bipolar DC lines are proposed. A unified impedance model of four-port network for bipolar overhead lines is established. Finally, the simulation results based on PSCAD show that the proposed model can solve the harmonic transfer analysis and exhibit good reliability, with at least 5% reduction in the average relative error under asymmetric conditions.

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并联多端直流输电系统双极架空线路四端口网络统一阻抗模型

并联双极多端直流输电系统存在多种工作模式，其中存在单极-双极混合形式的不对称条件。在这种情况下，谐波在线路上的分布与正常情况不同，通过极模变换得到的模域环的等效阻抗发生了变化。为了解决非对称条件下直流侧谐波分析问题，提出了适用于各种条件的双极直流架空线统一阻抗模型。首先，阐述了双极对称线模域的解耦模型和等效电路。然后，揭示了模域分量叠加计算方法在非对称条件下的局限性。在此基础上，从双极直流线路的双输入双输出端口网络出发，提出双极直流线路的四端口极模转换关系和四阶变换矩阵。建立了双极架空线路四端口网络的统一阻抗模型。最后，基于PSCAD的仿真结果表明，该模型能较好地解决谐波传输分析问题，在非对称条件下平均相对误差至少降低5%，具有良好的可靠性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Power Delivery 工程技术-工程：电子与电气

CiteScore

9.00

自引率

13.60%

发文量

513

审稿时长

6 months

期刊介绍： The scope of the Society embraces planning, research, development, design, application, construction, installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy. It includes the developing of engineering standards, the providing of information and instruction to the public and to legislators, as well as technical scientific, literary, educational and other activities that contribute to the electric power discipline or utilize the techniques or products within this discipline.