Study on the longitudinal protection of low-frequency transmission lines for offshore wind power based on the difference of the absolute value of the imaginary part of the integrated impedance

Study on the longitudinal protection of low-frequency transmission lines for offshore wind power based on the difference of the absolute value of the imaginary part of the integrated impedance | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Study on the longitudinal protection of low-frequency transmission lines for offshore wind power based on the difference of the absolute value of the imaginary part of the integrated impedance Chenqing Wang, Yan Tao, Jinyu Zhou, Xinyu Wu, Shuping Gao2* This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5330865/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 10 Jan, 2025 Read the published version in Electrical Engineering → Version 1 posted 8 You are reading this latest preprint version Abstract For offshore wind power low-frequency transmission system fault, the fault current on both sides of the line by the influence of the control strategy of the amplitude is limited, the phase angle of the open swing increases, resulting in the failure of the traditional longitudinal differential protection criterion. In order to solve this problem, this paper proposes a longitudinal protection method for offshore wind power low-frequency transmission lines based on the absolute value difference of the imaginary part of the integrated impedance. The integrated impedance is defined as the ratio of differential voltage and differential current, and the corresponding protection criterion is proposed according to the characteristics of the integrated impedance during faults inside and outside the zone. By comparing the absolute value of the imaginary part with the integrating value, the in-zone and out-of-zone faults of low-frequency transmission lines can be recognized. Finally, the simulation model of offshore wind power low-frequency transmission system is constructed by using the PSCAD simulation platform, and the reliability and effectiveness of the proposed protection method is verified by processing the fault data through Matlab. The simulation results show that the protection method is theoretically almost independent of the control strategy at both ends, can be operated reliably and according to phase when different fault types occur at different locations of the line, and has a strong ability to withstand transition resistance. low-frequency lines longitudinal differential protection negative sequence current suppression offshore wind power modular multilevel matrix converter integrated impedance Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 10 Jan, 2025 Read the published version in Electrical Engineering → Version 1 posted Editorial decision: Accepted 24 Dec, 2024 Reviewers agreed at journal 05 Dec, 2024 Reviews received at journal 02 Dec, 2024 Reviewers agreed at journal 02 Dec, 2024 Reviewers invited by journal 01 Dec, 2024 Editor assigned by journal 28 Oct, 2024 Submission checks completed at journal 26 Oct, 2024 First submitted to journal 25 Oct, 2024 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5330865","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":373116413,"identity":"040348b3-d284-489b-9295-0f3f300ff179","order_by":0,"name":"Chenqing Wang","email":"","orcid":"","institution":"State Grid Jiangsu Electric Power Co. Ltd. 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In order to solve this problem, this paper proposes a longitudinal protection method for offshore wind power low-frequency transmission lines based on the absolute value difference of the imaginary part of the integrated impedance. The integrated impedance is defined as the ratio of differential voltage and differential current, and the corresponding protection criterion is proposed according to the characteristics of the integrated impedance during faults inside and outside the zone. By comparing the absolute value of the imaginary part with the integrating value, the in-zone and out-of-zone faults of low-frequency transmission lines can be recognized. Finally, the simulation model of offshore wind power low-frequency transmission system is constructed by using the PSCAD simulation platform, and the reliability and effectiveness of the proposed protection method is verified by processing the fault data through Matlab. 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