Research on UHV AC/DC power grid's harmonic coupling characteristic under the action of geomagnetically induced currents

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-04-09 DOI:10.1016/j.epsr.2025.111652

Xinmeng Shao , Peihong Yang , Chunming Liu , Peng Li , Ruixian Wang

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引用次数: 0

Abstract

Geomagnetic-induced currents (GIC) caused by geomagnetic storms (GS) can lead to transformer core saturation and harmonic generation, which further couples with harmonics from ultra-high voltage (UHV) AC/DC transmission systems, complicating grid stability. Focusing on China's UHV DC hierarchical connection mode (HCM), this study establishes a harmonic coupling model integrating GIC effects and converter-transformer interactions. A harmonic state-space (HSS) framework combined with Euler's formula simplification enables efficient analysis of harmonic propagation in multi-voltage-level grids. Simulations using PSCAD/EMTDC reveal that the harmonic content generated by the coupling of the transformer and converter is higher than that generated by the transformer alone. The superimposed coupling of cluster harmonics exceeds national standards, with 2nd harmonic currents surpassing 1 % at the AC side and 3rd harmonic voltages reaching 4.86 % in 500 kV DC links. This work provides theoretical and practical foundations for enhancing UHV grid resilience against geomagnetic disturbances.

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地磁感应电流作用下特高压交直流电网谐波耦合特性研究

地磁风暴（GS）引起的地磁感应电流（GIC）可能导致变压器铁心饱和和谐波产生，并进一步与特高压（UHV）交流/直流输电系统的谐波耦合，使电网稳定性复杂化。本文以中国特高压直流分层连接模式（HCM）为研究对象，建立了综合GIC效应和变换器-变压器相互作用的谐波耦合模型。谐波状态空间（HSS）框架与欧拉公式简化相结合，可以有效地分析多电压级电网中的谐波传播。利用PSCAD/EMTDC进行的仿真表明，变压器与变流器耦合产生的谐波含量高于变压器单独产生的谐波含量。群次谐波叠加耦合超过国家标准，交流侧二次谐波电流超过1%，500 kV直流链路三次谐波电压达到4.86%。为提高特高压电网抗地磁干扰能力提供了理论和实践基础。

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

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.