Impedance Based Stability Analysis of the Multi-terminal Cascaded Hybrid HVDC System

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

IEEE Transactions on Power Delivery Pub Date : 2025-04-15 DOI:10.1109/TPWRD.2025.3561086

Ruiting Xu;Qin Jiang;Baohong Li;Yikui Liu;Tianqi Liu;Frede Blaabjerg;Peng Wang

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Abstract

The cascaded hybrid high voltage direct current (HVDC) combines the strengths of the line commutated converter (LCC) and the modular multilevel converter (MMC) in the long distance large capacity power transmission. However, its distributed muti-terminal grid structure raises the complexity of the whole system drastically. To clarify the oscillation mechanism of the multi-terminal cascaded hybrid HVDC system, utilizing the merits of the impedance model, this paper proposes an impedance based stability analysis method, which decomposes stability analysis problem into a hierarchical structure. In addition, an equivalent single-input single-output (SISO) impedance based method is proposed together for oscillation propagation analysis, which could depict how the oscillation spread from the perspective of the physical impedance network. Oscillation suppressing methods including impedance reshaping and parameter retuning could be tailored with the instruction of the impedance based stability analysis and thereby efficiency is improved considerably. The analytical results and the control method are verified through the electromagnetic transient simulation with practical data.

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基于阻抗的多端级联混合直流系统稳定性分析

级联混合高压直流（HVDC）结合了线路换向变换器（LCC）和模块化多电平变换器（MMC）在远距离大容量输电中的优点。然而，其分布式的多终端网格结构大大提高了整个系统的复杂性。为了阐明多端级联混合高压直流系统的振荡机理，利用阻抗模型的优点，提出了一种基于阻抗的稳定性分析方法，将稳定性分析问题分解为层次结构。此外，还提出了一种基于等效单输入单输出（SISO）阻抗的振荡传播分析方法，可以从物理阻抗网络的角度描述振荡如何传播。在基于阻抗稳定性分析的指导下，可以定制阻抗重塑和参数返回等抑制振荡的方法，从而大大提高了效率。通过实际数据的电磁瞬变仿真，验证了分析结果和控制方法。

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.