A novel protection scheme of wind farm access to flexible DC power grid based on high frequency measurement inductance difference

IF 5 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Electrical Power & Energy Systems Pub Date : 2025-05-17 DOI:10.1016/j.ijepes.2025.110752

Jing Ma , Xieyu Lin , Yilin Wu , Xinlu Li , Shiyu Feng

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引用次数: 0

Abstract

A protection scheme for the DC transmission line of the four-terminal flexible DC grid connected to the doubly-fed wind farm based on the high-frequency measurement inductance difference is proposed. Firstly, combined with the structure of MMC flexible DC converter, considering the switching of MMC converter sub-module, the high frequency model of MMC flexible DC converter is constructed. On this basis, combined with the DC side connection mode and system topology of the four-terminal MMC-HVDC grid connected to the doubly-fed wind farm, the high-frequency equivalent network of the four-terminal MMC-HVDC grid connected to the doubly-fed wind farm is constructed, and the high-frequency measured inductance difference measured by the DC transmission line protection is calculated. The difference between the measured high-frequency measurement inductance difference area is used to construct the protection criterion. Finally, the simulation results based on RT-LAB platform verify the effectiveness and superiority of the proposed method, which can reliably identify the fault of 300 Ω underground line within 3 ms.

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一种基于高频感应差测量的风电场接入柔性直流电网保护方案

提出了一种基于高频测量电感差的双馈风电场四端柔性直流电网直流传输线保护方案。首先，结合MMC柔性直流变换器的结构，考虑MMC变换器子模块的开关，构建了MMC柔性直流变换器的高频模型；在此基础上，结合双馈风电场四端MMC-HVDC电网直流侧连接方式和系统拓扑结构，构建双馈风电场四端MMC-HVDC电网高频等效网络，计算直流传输线保护测得的高频实测电感差。利用实测高频电感差面积的差值来构建保护判据。最后，基于RT-LAB平台的仿真结果验证了该方法的有效性和优越性，能够在3 ms内可靠地识别300 Ω地下线路的故障。

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

International Journal of Electrical Power & Energy Systems 工程技术-工程：电子与电气

CiteScore

12.10

自引率

17.30%

发文量

1022

审稿时长

51 days

期刊介绍： The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.